Military Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501COMPARISON OF AERODYNAMIC FORCES USING A RECOMMENDED AND A NON-RECOMMENDED LIFT SPOILER ON A PASSENGER CAR1143595110.21608/amme.2012.35951ENM. G.YazdaniSenior Lecturer, Dept. of Mechanical Engineering, Institute Technology Brunei-University.P. G. O.SumajayaStudent, Dept. of Mechanical Engineering, Institute Technology Brunei-University.M. N.ArifinStudent, Dept. of Mechanical Engineering, Institute Technology Brunei-University.Journal Article20190619ABSTRACT<br />An attempt was made to compare the aerodynamic forces acting on Subaru WRX<br />STi version IV (SPC) with a recommended World Rally Championship (WRC) and a<br />non-recommended GT Wing Type-A (GTA) spoilers. The experiment was done with<br />the following combination, SPC, SPC+WRC (REC), and SPC+GTA (NRE). The<br />above experiments were carried out at a Reynolds Number (R) range of 2.19 x 104 to<br />10.94 x104 and an angle of attack () of 0° to 20°. The lift coefficient (CL), drag<br />coefficient (CD) and side force coefficient (CS) are computed from the measured data<br />From the analyzed data, it was found that, for REC. CL decreased in the almost all<br />the investigated ranges of and R. The maximum decrease in CL is about 40% (at <br />= 20°). On the other hand for NRE, CL increases for almost all the investigated<br />ranges of and R. The maximum increase of CL is about 177%. At, 2.19 x<br />104R6.57 x 104, there is little or no changes in the value of CD for REC and SPC in<br />the investigated ranges of . It was found that value of CS for REC is less than that of<br />NRE in the investigated ranges of and R.https://amme.journals.ekb.eg/article_35951_2735ec88ba7867a63fc64007a17ca467.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DIAGNOSTIC OF TRIBOMECHANICAL SYSTEMS APPLIED ON MOTOR VEHICLES153595510.21608/amme.2012.35955ENS.PericUniversity of Defence, Military Academy, Belgrade, Serbia.A.GrkicUniversity of Defence, Military Academy, Belgrade, Serbia.M.KrsmanovicUniversity of Defence, Military Academy, Belgrade, Serbia.Journal Article20190619ABSTRACT<br />The central component of the tribomechanical system is the lubricant, whose most<br />significant function is the lowering of friction and wear appearing in the contact of two<br />surfaces in relative motion. As a subsystem, tribomechanical systems are integrated<br />everywhere into the technical systems. Apart from more significant applications in internal<br />combustion engines, transmission, and hydraulic systems, there is also a large number of<br />further applications. Due to the poor execution of the tribomechanical system or inadequate<br />application, if it is not fit for the given system, commercial losses may occur measured in<br />billions of euros annually. That is why the significance of the tribosystems is not only<br />technical, but also economic and environmental. The concept of the future successful<br />development endeavors to associate economy and ecology into a complex and noncontradictory<br />system.<br />Diagnostics of tribomechanical systems in motor vehicles is part of the overall process of<br />managing maintenance. It provides an opportunity for the user to predict the damage and/or<br />failure, and thus prevent delay in the work and extend usage life of motor vehicles. Recently,<br />special attention is focused on development of modern devices and methods for monitoring<br />condition changes of tribomehanical characteristics in systems. There are used today<br />different physical and chemical methods and tribology methods for tribomehanical system<br />diagnosis. Experience in technical systems exploitation showed that the most effective<br />failure prognosis is according to parameters, particles created as result of wear, which are<br />reliable indicators of wear. Analysis of oil samples which contain particles, created as results<br />of wear, enable evaluation of system tribology condition in different phases of system<br />exploitation. The paper presents the tribological tests in the analysis of oils that are used for<br />the assessment of this condition. Furthermore the results of experimental research of<br />tribological characteristics engines and power transmitters oil was sampled from engines<br />and power transmitters of vehicles Mercedes, PUCH and PINZGAUER, which were in use.<br />Investigations realized that there is a change of tribological characteristics of oil for<br />lubrication in the engines and power transmitters of vehicle. These changes are in direct<br />dependence on the state of all elements tribomechanical engines and power transmitters<br />system, and depending on their functional characteristics. Finally, is a conclusion based on<br />the realized testing?https://amme.journals.ekb.eg/article_35955_72ab57ea32436427d908a808675afe25.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501IMPROVEMENT OF OFF-ROAD VEHICLES PERFORMANCE USING CONTROLLABLE TORQUE DISTRIBUTION DEVICE1123595710.21608/amme.2012.35957ENM. M.Abd El-hafizAss. Lecture, Automotive Eng. Dept., Faculty of Eng. - Mataria, Helwan Univ., Cairo, Egypt.S.ShaabanProfessor, Automotive Eng. Dept., Faculty of Eng. - Mataria, Helwan Univ., Cairo, Egypt.W. A.OrabyAss. Professor, Automotive Eng. Dept., Faculty of Eng. - Mataria, Helwan Univ., Cairo, Egypt.M. A.EmamLecturer, Automotive Eng. Dept., Faculty of Eng. - Mataria, Helwan Univ., Cairo, Egypt.A. M.SharafEgyptian Armed Forces.Journal Article20190619ABSTRACT<br />A peculiarity of off-road vehicles is that their mobility depends not only on the total<br />power provided by the engine, but also on its distribution among the driven<br />axles/wheels. In turn, this distribution is largely dominated by the drivetrain<br />architecture and the inherent characteristics of the torque distribution devices.<br />Among the wide variations of torque distribution devices, controlled differential can<br />offer variable bias ratios over the entire operation of the vehicle.<br />This paper presents an electronically controlled device to modulate the applied force<br />over multi-plate clutches which are placed between the driven axle and stationary<br />hub. For the driving condition over split adhesion roads, the proposed device brakes<br />the spinning wheel over low adhesion side and therefore bias more torque to the<br />other wheel with good adhesion side. This would improve off-road mobility and save<br />the power losses on low traction wheels. A special test rig has been devised to<br />experimentally investigate the characteristics of the proposed device. The rig<br />compromises measurements of speed and torque applied to each wheel.<br />The obtained results show that various benefits could be gained when a controllable<br />multi plate clutch is implemented with simple differential driving axle. The system can<br />offer power saving than both passive differential and even limited slip differential.https://amme.journals.ekb.eg/article_35957_90d808c37565d441dd50600c755a51db.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501A STUDY OF THE EFFECT OF CONVENTIONAL STRUCTURAL MATERIALS REPLACEMENT BY INNOVATIVE MATERIALS ON THE VEHICLE CRASHWORTHINESS (FRONTAL IMPACT)1233595810.21608/amme.2012.35958ENH. M.ElgamalEgyptian Armed Forces.M. M.MoussaEgyptian Armed Forces.M. M.ElnomrossyAssist. Professor, French University, Cairo, Egypt.Journal Article20190619ABSTRACT<br />Several approaches were investigated in order to achieve the goal of producing a<br />lighter and safer vehicle. These approaches included studying of downsize the<br />vehicle (applied especially after 1973); and the replacement of conventional<br />structural materials with innovative materials, which gave similar or better<br />performance with less weight. Almost every part of the vehicle structure was<br />investigated by replacement with another one made from non-conventional material.<br />The main goal of this paper is to study the vehicle structural mechanics during crash<br />(frontal impact) and to search for the most suitable type of composite materials to<br />replace the conventional one in individual automotive structural parts to improve the<br />performance of the vehicle by decreasing the vehicle weight, increasing the power -<br />to - weight ratio and improve the energy absorption capacity.https://amme.journals.ekb.eg/article_35958_68499664073a42d42d5f219c0afc126c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501PREDICTION OF WHEEL NUMERIC FOR SANDY-TIRE1193596010.21608/amme.2012.35960ENA.HendyEgyptian Armed Forces.S.HegazyEgyptian Armed Forces.A.Abdel-BaryEgyptian Armed Forces.M. A.EmamAssociate professor, College of Engineering, Helwan University.Y.HendawyProfessor, Higher Institute of Technology, 10th of Ramadan City.Journal Article20190619ABSTRACT<br />The various techniques for evaluating the wheel numeric and vehicle performance<br />have been studied. The wheel numeric depends on many parameters; vehicle<br />weight, tire geometry, and soil strength in terms of cone index. The tire geometry<br />includes tire width, tire diameter, section height and tire deformation. The tire<br />deflection is very difficult to accurately measure. So the main purpose of this paper is<br />to develop a new wheel numeric formula with a new parameter depending on the<br />inflation pressure inside the tire instead of the tire deflection.<br />A theoretical study to investigate the effect of soil cone index, tire geometry and<br />vehicle weight on different wheel numeric has been carried out and so their effects<br />on the vehicle performance have been carried out. The performance of off road<br />vehicle on soft soil in terms of rolling resistance, drawbar pull and tractive efficiency<br />has been studied and investigated using variety of methods. These include;<br />theoretical, semi-empirical and empirical methods based on wheel mobility number.<br />The results showed that the new numeric formula gives a good correlation with<br />published results at different soil cone index, vehicle weight, tire width, tire diameter<br />and tire inflation pressure. Also the predicted performance has a good agreement<br />with published experimental results at same conditions.https://amme.journals.ekb.eg/article_35960_29544dbdc190541e653195b53be1ca0d.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DESIGN OPTIMIZATION OF THIN WALLED STRUCTURES UNDER IMPACT LOADING USING THE RESPONSE SURFACE METHOD1103596210.21608/amme.2012.35962ENH. M.EltaherEgyptian Armed Forces.Journal Article20190619ABSTRACT<br />Structural design optimization under impact loading faces two difficulties. First, the<br />inherent complexity of the finite element model required for modeling the<br />complicated physical phenomenon, and second the high computational cost required<br />by the iterative nature of numerical optimization. This paper presents a practical<br />approach for solving this problem by using the response surface method as an<br />approximate model rather than the computationally expensive one. Then numerical<br />optimization can be conducted at an affordable computational cost. Finally, only one<br />simulation analysis is conducted using the initial finite element model to verify the<br />optimum design achieved from numerical optimization. The proposed approach has<br />been successfully applied to the problem of designing a thin walled tube under<br />impact loading which suggests that this approach can be used for solving design<br />optimization problems of other complex structures.https://amme.journals.ekb.eg/article_35962_5cba25f3cdb2b112ebf2c40bcb98f2b4.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501NEW TRENDS TO IMPROVE IMPACT RESISTANCE FOR AUTOMOTIVE BUMPER193596410.21608/amme.2012.35964ENA-FTamimModern Academy of Engineering and Technology in Maadi, Cairo, Egypt.S. A.AlbatlanHigher Technological Institute, 6th of October Branch, Giza, Egypt.Journal Article20190619ABSTRACT<br />Bumpers play an important role in preventing the impact energy from being<br />transferred to the automobile and passengers. Saving the impact energy in the<br />bumper to be released in the environment reduces the damages of the automobile<br />and passengers. Therefore researchers have sought to make bumpers lighter<br />without sacrificing strength, ability to absorb impact, or passenger safety. This study<br />investigates the possibility of adding filling material between the bumper and front<br />car body. The experimental tests were conducted and applied on front bumper of<br />Fiat- Sahin vehicle.<br />The results showed the improvement in bumper impact resistance about 260% when<br />using one layer of honey comb cardboard cell and cardboard sheets as filling<br />materials.https://amme.journals.ekb.eg/article_35964_d599ca83c8f3855e48a48dad1ddd399a.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501CONGESTION DUE TO TRAFFIC DESIGN AND ITS IMPACT ON FUEL CONSUMPTION AND VEHICLE EMISSIONS: A CASE STUDY1163596510.21608/amme.2012.35965ENA. A.Abdel-RehimMechanical Engineering Dept., The British University in Egypt (BUE), El-Shrouk City,
Egypt. On leave from Shoubra Faculty of Engineering, Benha University, Cairo, Egypt.Journal Article20190619ABSTRACT<br />With the fast-growing economy and population, transportation has become a crucial<br />component of modern life in Egypt. Sales of road vehicles have been growing at a<br />tremendous speed over the last few years. On the other hand, the growth of<br />infrastructure is however much slower than that of vehicles. This has led to severe<br />congestion problems in the city of Cairo evidenced by very low average vehicle<br />speeds and high percentages of driving time in idling, acceleration and deceleration.<br />Traffic congestion has a direct impact on quality of life in most of countries.<br />Congestion deals with much more than just the cost of burning fuel, wasting time and<br />car maintenance but it affects drivers attitude, health and work performance. It is<br />also leading to more crashes, and air pollution. Congestion is ultimately resulting in a<br />less productive economy and reduced quality of life for many people. Of course there<br />are solutions which could reduce the effect of congestions on the people’s life and<br />the country economy in Egypt.<br />In the present paper facts about the cost of congestions in one of the many<br />congestion spots around Cairo are presented. In the present case study the<br />congestion is resulted from adopting one of the traffic designs in an improper place<br />(U-turn concept). Fuel consumption, wasted time, traveled distance, are some<br />examples of the estimated parameters due to the congestion in 9 U-Turns which<br />were chosen in one of the main streets in Cairo.https://amme.journals.ekb.eg/article_35965_c6fc8c461107c60d132b4cae8e8f6264.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501MONTE CARLO SIMULATIONS FOR EVALUATION OF UNCERTAINTY EFFECTS IN STRUCTURAL DESIGNS1123596810.21608/amme.2012.35968ENH. M.EltaherEgyptian Armed Forces.Journal Article20190619ABSTRACT<br />This paper presents a practical approach for evaluating the effect of uncertainty in<br />design variables on the behaviour of structure. The proposed approach shows how<br />Monte Carlo simulations can be effectively used to evaluate the uncertainty effects.<br />A case study of a structure under static loading has been used to demonstrate the<br />approach. The results have shown that using the proposed approach can serve as a<br />practical tool for virtual testing of structure designs. This will help the designer in<br />estimating and understanding the complicated and unforeseen uncertainty effects on<br />structure design performance.https://amme.journals.ekb.eg/article_35968_824b5722f4e1c16b6f36ef32cf51f023.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501PARAMETERS AFFECTING THE EROSIVE BURNING OF SOLID ROCKET MOTOR1123690510.21608/amme.2012.36905ENA. A.MoustafaEgyptian Armed Forces.H. M.AbdallaEgyptian Armed Forces.M. A.El-SanabawyEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />Increasing of velocity of gases inside solid rocket motors with low port-to-throat area<br />ratios, leading to increased occurrence and severity of burning rate augmentation<br />due to flow of propellant products across burning propellant surfaces (erosive<br />burring), erosive burning of high energy composite propellant was investigated to<br />supply rocket motor design criteria and to supplement knowledge of combustion<br />phenomena, pressure, burning rate and high velocity of gases all of these are<br />parameters affect on erosive burning, the used motor in the tests is 2 inch motor,<br />and a modified one with different grain dimensions, the tests show the pressure time<br />curve and the erosive burning phenomena.https://amme.journals.ekb.eg/article_36905_ab6c79b532ce7fbb5fee7f9d7bb2d10a.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501CAUCHY PROBLEM FOR SHAPED CHARGE DESIGN OPTIMIZATION193690610.21608/amme.2012.36906ENH. I.HristovProf., Head of Armament and Ammunition Dept., Defense Institute, Sofia, Bulgaria.Journal Article20190625ABSTRACT<br />The main disadvantage of the cumulative jet is the velocity gradient on the jet length.<br />Due to the velocity gradient, the jet has effectiveness only in a strong focus distance<br />from the target. One possibility to resolve this problem is by the Cauchy problem.<br />The Cauchy problem for a shaped charge design optimization is presented in the<br />report. The optimization includes the profile determination of main surfaces of the<br />shaped charge elements, which influences into the forming of the cumulative jet<br />under condition of the no-gradient velocity of the jet length.<br />The solution of the task is fulfilled within the hypothesis of the radial-flat scheme of<br />the hydrodynamic model of Orlenko-Staniukovitch. On this basis, the functions of the<br />shaped charge main elements profiles (shell, liner and explosive charge between<br />them) enter into the first order ordinary differential equation.<br />In the end, the Cauchy problem for the first order ordinary differential equation is<br />formulated considering the unknown function of the cumulative charge geometry on<br />condition if other function is known. The solutions allow the cumulative liner profile<br />design in case of a known shell profile, or the shaped charge shell profile design in<br />case of a known cumulative liner profile. In both cases the designed profiles ensure<br />no-gradient velocity jet forming and its saving in a distance different from the focus.<br />The experiments with the designed charges were verified into an armor in a distance<br />between shaped charges and armor up to 7 calibers.https://amme.journals.ekb.eg/article_36906_14c092e470e7209c8a5f023fd5129551.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501WHY BALLISTIC TESTING METHODS OF BODY ARMOR DO NOT GIVE US ACCURATE INFORMATION1103690710.21608/amme.2012.36907ENB. G.GenovHead expert, Ph.D., Dept. of Armaments, Technics and Equipment Development,
Defense Institute, Sofia, Republic of Bulgaria.Journal Article20190625ABSTRACT<br />Manufacturers and especially the users of ballistic protection systems need an<br />adequate answer to the question whether the chosen protection is effective against<br />specific threats. Such evaluation is difficult enough, mainly because ballistic systems<br />of body armors are high technology products and they embody last achievements in<br />technology and science. The the only verified and reliable method for effectiveness<br />assessment of needed ballistic protection from different threats (bullets, fragments,<br />explosions, stab protection, etc.), is ballistic test. The bullet resistance is maybe most<br />important feature of body armors. And the more often used method for assssment<br />of ballistic protection level is determined by series 0101 NIJ Standards: the body<br />armor, mounted on plasticine block is hitted by different caliber ammo and at one<br />side there hasn’t to be penetration, and at other hand the blunt trauma hasn’t to<br />exceed 44 mm. These should guarantee body armor ballistic protection rate. Other<br />“plasticine” based ballistic testing standards have same imperfections, because they<br />origin from 0101 series of NIJ Standards.<br />This scenario for bullet resistance testing is needed for general reconstruction: the<br />plasticine has a quite different properties in comparison with different areas of<br />human body; the measured value of penetration has only static component – lack of<br />correspondence with real situations, dynamic component (impact wave propagation,<br />character of wave, etc.) isn’t included; and last but not least this criteria for highspeed<br />(rifle) bullets never has been compared with human/animal corpses results.<br />These imperfections of the scenario specify the goal of this paper – to summarize<br />main problems related with this scenario of testing and to provide some directions to<br />improve testing methodology.https://amme.journals.ekb.eg/article_36907_dc041299252582f83be737fdf6f0d0a5.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ANALYTICAL STUDY OF GAS UNIT GEOMETRICAL CHARACTERISTICS AND THEIR IMPACT ON THE MOMENTUM OF RECOLILING PARTS1163690810.21608/amme.2012.36908ENM. S.Abo-ElkhairEgyptian armed forces.Journal Article20190625ABSTRACT<br />On handling the problem of automation in automatic weapons (AW), it is important to<br />analyze the motion of these weapon mechanisms during their function cycle [1, 2].<br />Many activities are performed during the backward motion of weapon mechanisms<br />using the power of branching gases from what known as Gas Unit (GU). These<br />activities starts with under-slide motion, unlocking, extraction of empty Cartridge<br />Case (c.c.), backward motion against springs, ejection of empty c.c., and ending by<br />loading of trigger at the extreme rear position. All these activities are performed in a<br />reversed manner during the counter recoil track.<br />In this paper; the parameters affecting the momentum of branching gases have been<br />extensively studied, the performance of the gas unit is converted to touchable figures<br />in order to facilitate the evaluation. These evaluations are presented in forms of<br />change in pressure of gases inside the GU, maximum velocity of recoil, and the<br />displacement of recoiling parts until the pressure inside the gas unit reaches the<br />atmospheric value [7,8]. The predicted results determine the weight of each<br />parameter that affects the momentum of gases. Moreover, the affecting parameters<br />of GU on the weapon performance during the function cycle may be considered on<br />modifying the power of in-service weapons, or the newly designed generationshttps://amme.journals.ekb.eg/article_36908_61597b4153f6c6ca962ce152fe7f2cdf.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501OPTIMUM CHOICE OF GAS UNIT GEOMETRICAL CHARACTERISTICS TO ENHANCE ITS EFFICIENCY1143691010.21608/amme.2012.36910ENM. S.Abo ElkhairEgyptian armed forces.Journal Article20190625ABSTRACT<br />Automatic weapons are considered as an internal combustion engine, where the<br />driving energy is supplied from the burning of the smokeless propellant charge, it<br />burns producing tremendous power of hot gases. This power is extensively used in<br />driving of projectile through the barrel, and the motion of weapon mechanisms that<br />leads to the full automation of weapon functions.<br />In order to achieve the second goal of gases usage, a constructional arrangement is<br />fixed on weapon barrel, this arrangement allows gases to branch and drive the main<br />moving weapon component, this component is known as the breech block carrier [1].<br />The motion of which is responsible of moving all other mechanisms in automatic<br />weapon.<br />The regulations and controlling over the output from the gas unit are affected<br />basically by the changes of the geometrical characteristics of the gas unit. In this<br />work, the variations of these geometrical parameters of the gas unit and their<br />reflections on its efficiency have been studied. The present study facilitates the<br />choice of effective parameters specially when designing a new weapon or modifying<br />the power of an existing weapon.https://amme.journals.ekb.eg/article_36910_87829ee65c6289cf3aa2ecd3ca7f2ad8.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501MODELING OF METALLIZED SOLID FUEL HYBRID PROPULSION SYSTEM1223691110.21608/amme.2012.36911ENA. E.MakledEgyptian Armed Forces.H. E.MostafaEgyptian Armed Forces.M. A.Al-SanabawyEgyptian Armed Forces.M. J.Al-TimimiBahrain Armed Forces.Journal Article20190625ABSTRACT<br />The most commonly used Hybrid Rocket Motor (HRM) consists of an inert pure solid fuel<br />(SF) with liquid or gaseous oxidizer. Until now, the regression rate of SF in HRM has<br />typically been an order of magnitude lower than that of solid propellant motor. The<br />objective of this paper is to investigate the possible enhancement of regression rate by<br />addition of metal powder. This may guide to effectively design and produce high<br />performance HRM for specific applications.<br />A mathematical model has been introduced and a computer program is built to describe<br />metalized SF regression rate and HRM performance. A series of experimental tests<br />using a small scale HRM employs Polyethylene (PE) with Aluminum (Al) metal powder<br />additive (2.5, 5, 7.5, 10, 12.5, and 15% by mass) as SF and gaseous oxygen (GO2) as<br />oxidizer to evaluate the metalized SF regression rate and HRM performance.<br />The measured experimental data are compared with results obtained from theoretical<br />computation. The comparison shows good agreement, which proves the validity of the<br />developed program, since the maximum error noticed was generally less than 10%. An<br />addition of up to 7.5% Al powder increases the regression rate by about 90% and the<br />chamber pressure by nearly 40% as compared to classical HRM with no additives.https://amme.journals.ekb.eg/article_36911_62ba487ae1c8d472ff0e30fff10e52da.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501A LABSCALE HYBRID ROCKET MOTOR IGNITION SYSTEM1203691210.21608/amme.2012.36912ENA. E.MakledEgyptian Armed forces.H. E.MostafaEgyptian Armed forces.M. A.Al-SanabawyEgyptian Armed forces.M. J.Al-TimimiBahrain Armed Forces.Journal Article20190625ABSTRACT<br />The hybrid propulsion has the superiority of safety (Non-explosive), simplicity (high<br />reliability), low environmental pollution and available technology over traditional solid<br />and liquid propulsion, all these benefits have a tendency to low cost and laboratory<br />work. Classical hybrid rocket motor (HRM), however have suffered from slow fuel<br />regression rate, relatively poor combustion efficiency and still in search of safety<br />ignition system.<br />The direct goal of the paper is to realize a functioning test, evaluating the<br />performance of a designed Small-Scale Hybrid Rocket Motor (SSHRM) and<br />prepared for laboratory firing tests. Moreover, the objective is extended to examine<br />different types of ignition methods (pyrotechnic charge, fuse wire, heat wire and<br />finally hot oxidizer method by using heat exchanger), which are proposed as very<br />safe ignition method and finally recognize phenomena of re-start operation. Various<br />fuel grains with different configuration of Polyethylene (PE), metalized PE (PE+AL)<br />and Polymethyle-methacrylate (PMMA) were developed and it is decided to use the<br />commercial gaseous oxygen, for its availability and low cost.<br />A SSHRM has been designed, manufactured and tested at various conditions with<br />high level of safety. Ignition by hot air has been proved to be a very attractive ignition<br />method for SSHRM, for its higher safety, higher reliability and acceptable delay time.<br />Adding Al powder to PE fuel proved to have more smooth fuel grain surface with less<br />plume soot, higher regression rate and combustion efficiency, less combustion<br />instability, ignition delay time and nozzle life compared with pure PE combustion.<br />Finally; the re-start operation was demonstrated several times and can be carried out<br />more easily with hot air ignition method.https://amme.journals.ekb.eg/article_36912_661254a26b02ad4fbbe522d8b2ef6db4.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501NUMERICAL STUDY ON FLOW CHARACTERISTICS OF AIR PAST A PROJECTILE WITH A TRIANGULAR BASE1203691410.21608/amme.2012.36914ENE.El-AwwadEgyptian Armed Forces.A. Z.IbrahimEgyptian Armed Forces.A. M.El-SebaeEgyptian Armed Forces.A. M.RiadEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />A computational study has been carried out to investigate the air flow over a<br />projectile provided with a triangular base at transonic and supersonic speeds. The<br />study aims to discuss the effect of the triangular base on the air flow characteristics<br />comparing with the flow over a typical projectile. One of the study main concerns is<br />the drag since it is the key issue in the projectile range. Good agreement is noted<br />when comparing the computational drag coefficients with the experimental work of<br />Platou [11]. The study shows that the flat surfaces of the unconventional boattail<br />cause the formation of a single normal shock wave at transonic speeds. Moreover,<br />these surfaces may be a main reason for the shock wave smearing at<br />transonic/supersonic speeds and lower turbulence level in the base region. A<br />diminishing of the wake behind the unconventional base is noted resulting in nearer<br />rear stagnation point and lower base drag.https://amme.journals.ekb.eg/article_36914_f2b014be95b99de0c46a2358f025c9d4.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501BALLISTIC PERFORMANCE OF A PROJECTILE WITH A DEVELOPED BOATTAIL1183691510.21608/amme.2012.36915ENE.El-AwwadEgyptian Armed Forces.A. Z.IbrahimEgyptian Armed Forces.A. M.El-SebaeEgyptian Armed Forces.A. M.RiadEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />A computational study using Reynolds-Averaged Navier-Stokes (RANS) equations<br />has been carried out to investigate air flow past projectiles provided with nonaxisymmetric<br />boattail at transonic and supersonic speeds. The non-axisymmetric<br />boattail is formed by cutting the conventional boattail with three flat surfaces having<br />inclination angle of ten degrees. The present study aims to discuss the effect of the<br />existence of these flat surfaces on the air flow characteristics compared to typical<br />projectile having the same base area. One of the study main concerns is the drag<br />and it impact on the projectile trajectory. The present study shows that the existence<br />of flat surfaces on the new unconventional projectile boattail is a reason of<br />weakening the shock wave formed on the boattail. The wake behind the<br />unconventional projectile base is smaller than that of the conventional model.<br />Moreover, the unconventional projectile has a lower pitching moment than the typical<br />projectile at angle of attack of three degrees.https://amme.journals.ekb.eg/article_36915_e9109396512e5942714152745c52ba7d.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501KRYLOV-BOGOLIUBOV APPROACH TO NON-LINEAR HYSTERETIC INSTABILITY IN ROTORDYNAMICS1273691610.21608/amme.2012.36916ENF.SorgeProfessor, DICGIM, University of Palermo, Italy.Journal Article20190625ABSTRACT<br />The internal friction due to the shaft hysteresis or the shrink fitting release exerts a<br />destabilizing effect on the overcritical rotor whirl, but may be counteracted by other<br />external dissipative sources and/or by proper anisotropy of the support stiffness. The<br />internal friction effect may be treated by either dry or viscous models, obtaining<br />similar results in the hypothesis of small dissipation levels, provided that proper<br />equivalence criteria are defined between the two approaches. The equivalence is<br />here stated by imposing the same energy dissipation over a large number of shaft<br />revolutions. Approximate closed-form autonomous solutions for a symmetric rotor<br />arrangement subject to Coulombian non-linear friction are derived by an averaging<br />approach of the Krylov-Bogoliubov type, in order to ascertain the result similarity<br />between the two dissipative assumptions. Summing up, the viscous equivalent linear<br />assumption appears conservative in general and may be accepted for a<br />straightforward analysis of the overall rotor dynamics in the whole speed range.https://amme.journals.ekb.eg/article_36916_4edd811f8a2cb8a306f790e1ee940a13.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DYNAMIC ANALYSIS OF HOISTING VISCOUS DAMPING STRING WITH TIME-VARYING LENGTH1123691710.21608/amme.2012.36917ENJ. H.BaoDoctoral student, School of Mechanical Engineering, Shanghai Jiaotong
University, Shanghai, People’s Republic of China.P.ZhangDoctor, School of Mechanical Engineering; State Key Laboratory of Mechanical
System and Vibration, Shanghai Jiaotong University, Shanghai, People’s Republic
of China (Corresponding author).C. M.ZhuProfessor, School of Mechanical Engineering, Shanghai Jiaotong University,
Shanghai, People’s Republic of China.Journal Article20190625ABSTRACT<br />The nonlinear dynamic analysis of a hoisting viscous damping string with time-varying<br />length is investigated. The hoisting string is modeled as a taut translating string with a<br />rigid body attached at its low end. A systematic procedure for deriving the system<br />model of hoisting viscoelastic string with time-varying is presented. The governing<br />equations are developed employing the extended Hamilton’s principle considering<br />coupling of axial movement and flexuarl deformation of string. The Galerkin’s method<br />and the 4th Runge-Kutta method are employed to numerically analyze the resulting<br />equations. The motions of elevator hoisting system are presented to illustrate the<br />proposed mathematical models. The results of simulation show that the material<br />viscous damping helps stabilize the transverse vibration. The modeling methods can<br />represent the transverse vibration of hoisting viscous damping string with<br />time-varying length.https://amme.journals.ekb.eg/article_36917_31581c3103ffe484e019711f09854dad.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501FLY AROUND MISSION IN NON- KEPLERIAN ORBIT193691810.21608/amme.2012.36918ENA.BadawyEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />On-orbit manoeuvring in Low earth non-Keplerian orbit is discussed. High<br />performance control strategies are required for these types of formation flying<br />missions. The simple solution for Keplerian orbit is somewhat far from accuracy,<br />while accurate solution for non-Keplerian orbit is not simple. Motion planning<br />algorithms are used herein to accomplish successful fly around of orbiting objects.<br />Close manoeuvres are performed as these manoeuvring objects approach the<br />central body around which they will fly.https://amme.journals.ekb.eg/article_36918_5e9034f8acfe693459f026680244c15b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501STRESS AND DYNAMIC ANALYSIS OF SIMPLE REMOTELY OPERATED UNDERWATER VEHICLE1223691910.21608/amme.2012.36919ENA. M.BadawyEgyptian Armed Forces.A. A.OmerEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />Stress and dynamic analyses of submerged structures, especially Remotely<br />Operated Underwater Vehicles (ROV) are the first step to build and design an<br />underwater vehicle. In the present paper the high pressure produced form the water<br />column weight plus the dynamic pressure produced from the vehicle speed is<br />calculated. The stress affects the structure due to both static and dynamic loads is<br />obtained. The fulfillment of these analyses needed the use of finite element model<br />simulating the structure. Stress analysis is made by the finite element package<br />ABAQUS® version 6.8. The dynamic analysis introduces the equation of motion<br />representing the dynamic behavior of the vehicle under the effect of the<br />hydrodynamic load against the vehicle motion. Equations define the added mass<br />coefficients are used mathematically to estimate the added mass coefficients. The<br />added mass coefficients are estimated practically by means of a free decay<br />pendulum motion test. The hydrodynamic coefficients (linear and quadric damping<br />coefficients,) are determined using the computational fluid dynamic through software<br />ANSIS CFX. These coefficients are compared by the coefficients estimated<br />practically by means of a free decay pendulum motion test. Good agreement<br />between practical and CFD hydrodynamic coefficient is achieved. The variation of<br />ROV acceleration and velocity with time is obtained for surge and heave directions<br />with varying thrusting load.https://amme.journals.ekb.eg/article_36919_d925d7db2f3ef7303bf1bd20038dafd8.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501SWIRL GRANULAR FLOWS IN A HORIZONTAL SHAKEN GRANULAR MATERIAL1163692210.21608/amme.2012.36922ENA.BakhshinejadGraduate student, Faculty of Industrial, Mechanical Engineering and Computer
Sciences, University of Iceland.P.ZamankhanProfessor, Faculty of Industrial, Mechanical Engineering and Computer Sciences,
University of Iceland.Journal Article20190625ABSTRACT<br />A series of experiments done in which a granular material is exposed to horizontal<br />vibration within a rectangular container with two hallow cylinders mounted inside of it.<br />At high values of the peak acceleration relative to gravity novel swirl granular flows<br />are observed within the cylinders while the grains cascade down the outer surface of<br />the piles which fixed in the bottom of the container within the rectangular container<br />outside the cylinders. Computer simulations are performed which may support the<br />existent interpretation of the unusual aforementioned behaviour.https://amme.journals.ekb.eg/article_36922_c62b58fa4d69b4511f05f85286741842.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501FAULTS DIAGNOSIS USING ON-SHAFT VIBRATION MEASUREMENT IN ROTATING MACHINES1193692310.21608/amme.2012.36923ENM. E.ElnadyGraduate student, school of MACE, the University of Manchester, Manchester
M13 9PL, U.K.J. K.SinhaSchool of MACE, the University of Manchester, Manchester M13 9PL, U.K.S. O.OyadijiLecturer, school of MACE, the University of Manchester, Manchester M13
9PL, U.K.Journal Article20190625ABSTRACT<br />Rotating machines are an essential element for most of the modern mechanical<br />systems. Hence, the reliable and continuous monitoring of their health is always<br />receiving attention to ensure safety and reduce downtime. Vibration based fault<br />diagnosis is one of the robust and well established techniques used to monitor the<br />condition of a rotating machine. The early the fault is detected the more time is<br />allowed for proper diagnosis and maintenance planning. The conventional method of<br />measuring the vibration on the bearing pedestals proved to be applicable in most<br />cases of machines structures and configurations. However, it requires a number of<br />vibration sensors at each bearing pedestal for fault diagnosis. The on-shaft vibration<br />measurement forms a proper solution as it provides enriched vibration content with<br />much less number of sensors, and consequently leads to better fault diagnosis. In<br />this paper, the on-shaft vibration measurement technique is presented and its<br />applicability to diagnose different faults introduced to an experimental test rig is<br />investigated.https://amme.journals.ekb.eg/article_36923_86d8286fd48d19612eb18a27b4f3fa7b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501CONSTRUCTIVE OPTIMIZATION OF TELESCOPIC PLATFORMS DUE TO VIBRATION1173692510.21608/amme.2012.36925ENA.Yucel(Corresponding Author) Dr. Lecturer, Istanbul Technical University, Mechanical Engineering Dept.,
Gumussuyu Istanbul Turkey, Tel: +902122931300 (Ext: 2404).A.ArpaciProf. Dr., Istanbul Technical University, Mechanical Engineering Dept., Gumussuyu Istanbul Turkey,
Tel: +902122931300 (Ext: 2415).Journal Article20190625ABSTRACT<br />In this study, vibrational analyses of telescopic platforms which are widely used in<br />construction areas have been conducted and these structures have been optimized<br />in order to satisfy vibrational standards. A vibration analysis has been conducted on<br />a platform using solid modeling and finite element analysis method. Also the results<br />of this analyses have been verified using experimental modal analyses. By means of<br />finite element and experimental modal analyses, free vibration analyses have been<br />implemented and natural frequencies and mode shapes have been determined. Also<br />vibration acceleration values on the structure have been obtained by a forced<br />vibration analysis conducted over the model. All these analyses have been done on<br />the new optimized structure and it has been determined whether the optimized<br />structure satisfies the vibrational standards.https://amme.journals.ekb.eg/article_36925_036b71cbd2bc496fa8727200e1483dce.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EXPERIMENTAL AND NUMERICAL INVESTIGATION OF THE CAPABILITIES OF PERIODIC PLATES FOR VIBRATION ATTENUATION1143692710.21608/amme.2012.36927ENS.TalaatSpace Division, National Authority of Remote Sensing and Space Sciences,
Cairo, 11769, Egypt.A.DesokiAerospace engineering Department, Cairo University, Giza, 12613, Egypt.M.TawfikAerospace engineering Department, Cairo University, Giza, 12613, Egypt.H. M.NegmAerospace engineering Department, Cairo University, Giza, 12613, Egypt.Journal Article20190625ABSTRACT<br />In the previous decades, many numerical and experimental investigations on the<br />capabilities of periodic structures for vibration attenuation and localization were<br />performed and proved those capabilities for different simple structures. Earlier<br />investigation of such phenomenon in periodic plates was not promising due to<br />different factors. In this research, experimental and numerical investigations of the<br />vibration response of different periodic plates are investigated to examine similar<br />behavior of periodic plates. Three different periodic configurations were tested under<br />‘almost’ free support boundary conditions. This work is an important over that<br />performed by Hull [9]. Milled plates are used to avoid the effect of the adhesive<br />material in damping which was used [3]. The experiments involved the excitation<br />from one corner of the square plate and measuring the response at the three other<br />corners. The results were compared to that of a similar size plain plate. The results<br />indicated the reduction of the response of the periodic plates, which have overall less<br />weight, by ratios that may exceed 10 db in different frequency bands. The results of<br />this work, verified by experiments, encourage more investigation on the localization<br />capabilities of those plates as well as the preparation of numerical models that may<br />predict those results in a more accurate fashion.https://amme.journals.ekb.eg/article_36927_6bd11a3022c5a1539fe319543d4aeb07.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501STUDYING THE PROCESS OF OBTAINING FINE COPPER POWDERS BY ELECTROLYSIS163692810.21608/amme.2012.36928ENR. S.AkpanbayevPhD candidate, Dept. of Metallurgical Processes, Thermal Engineering and
Technology of Special Materials, KazNTU, Almaty, Kazakhstan.Journal Article20190625ABSTRACT<br />The electrolytic reception of copper powders is the most studied and widely applied<br />method, but at the implementation of process of electro-deposition, it is difficult to<br />obtain fine and ultrafine powders.<br />Surveys have established technological regimes of electrolysis (cathodic current<br />density, copper and sulfuric acid concentrations, duration of electrolysis, etc.). The<br />current efficiency depending on the cathode material was studied.<br />The influences of organic compounds on dendrite-formation, size and grain shape of<br />obtained copper powder are studied. The nature of organic additives with<br />different functional groups and structure, affect the nature of grit and dispersion<br />and the crystal structure of copper deposits, and causes reflexion in<br />color transition of the deposited powder.https://amme.journals.ekb.eg/article_36928_6938a6c1c40a31cc489faaa268504cef.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501CALIBRATION OF THE HYSTERESIS LOOP OF SMA WIRES HEATED BY ELECTRIC CURRENT1133692910.21608/amme.2012.36929ENM.FoudaGraduate student, Dept. of Aerospace Eng., Cairo University.M.TawfikAssociate professor of aircraft structures, Dept. of Aerospace Eng., Cairo University.G.ElbayoumiProfessor of aircraft control and guidance, Dept. of Aerospace Eng., Cairo University.Journal Article20190625ABSTRACT<br />The undesirable vibrations in all structures types (buildings, vehicles, machines and<br />electronics) affect the durability, performance and the control of these structures.<br />Damping of these vibrations is the concern of many researches using smart<br />materials. The super-elastic behavior of shape memory alloys (SMA) may be utilized<br />in the active damping of structures vibrations.<br />SMA wire was obtained for this research but we had to calibrate it to get loadelongation-<br />heat relations. In the process of SMA calibrating, an experimental device<br />was designed to measure different loadings and the corresponding elongations at<br />different heating conditions. To control the temperature an electric direct<br />current was used.<br />The obtained experimental results were similar to the results in several published<br />researches. The relation between the electric current and the crystal transformation<br />of SMA under different loadings is well defined. Clear stress-strain curves showing<br />the hysteresis loop at different current values were obtained.https://amme.journals.ekb.eg/article_36929_3e52bb0e86fd3e55d657a4b0e630cdcb.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ENHANCING PROPERTIES OF CAST AL ALLOYS BY RHEOCASTING AND NANO-DISPERSIONS1183693010.21608/amme.2012.36930ENI.El MahallawiProf., Faculty of Engineering, Cairo University.Y.ShashProf., Faculty of Engineering, Cairo University.R.RashadProf., Faculty of Engineering, Cairo University.H.AbdelkaderFaculty of Engineering, Helwan University.L.ShehataLecturer, Ministry of Military Production.M. H.AbdelazizGraduate student, British University in Egypt.A.AmerGraduate student, Ministry of Military Production.J.MayerGraduate student, Ministry of Military Production.A.SchwedtProf., Aachen University, Germany.Journal Article20190625ABSTRACT<br />In this work a number of cast samples of A356 and A390 were prepared by rheocasting<br />in a specially designed and built furnace unit allowing for the addition of the<br />nano-particles into the molten Al-Si alloy with mechanical stirring. The microstructure<br />features and the mechanical properties of the cast samples were investigated, as<br />well as resistance to wear and corrosion in laboratory tests.<br />The results obtained in this work showed improved wear and corrosion resistance of<br />the nano-dispersed hypereutectic A390 alloys, as well as enhancement in the<br />mechanical strength of the nano-dispersed hypoeutectic A356 alloys, accompanied<br />by significant increase in the elongation percentage, supported by evidence of<br />refined dendrite arms length, and inter-lamellar spacing. The work also shows<br />significant enhancement in the wear and corrosion performance of the nanodispersed<br />alloys.https://amme.journals.ekb.eg/article_36930_b752e450f512a8aef716c6dc5c08ebef.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501MECHANICAL AND WEAR BEHAVIOUR OF SOLUTION TREATED Ti-6Al-4V ALLOY193693110.21608/amme.2012.36931ENK. M.IbrahimAssociate professor, Manufacturing Technology Dept., CMRDI, Cairo, Egypt.Y.FouadLecturer, GUC, Cairo, Egypt.Journal Article20190625ABSTRACT<br />Microstructural evaluation and wear characteristics of solution treated Ti-6Al-4V alloy<br />have been investigated. The material was produced using vacuum induction furnace<br />and then applying hot rolling at 900 °C to reduce the samples thickness from 30 to<br />12 mm. One part of the material was water-quenched from a temperature above -<br />transus at 1100 °C/60 min. to produce a beta lamellar microstructure imbedded in<br />some alpha phase. The other part was water quenched from a temperature below -<br />transus at 950 °C/60 min. to generate an equiaxed microstructure. The fine lamellar<br />structure resulted in ultimate strength and wear resistance significantly superior to<br />the equiaxed microstructure. The overall best combination of hardness, tensile<br />properties, and wear resistance of the studied Ti-6Al-4V is achieved by solution<br />treatment at 1100 °C/60 min. and the lowest values were obtained for the as-cast<br />structure due to the heterogeneity in structure and large grain size that ranged from<br />350 to 50 μm.https://amme.journals.ekb.eg/article_36931_1d49eebad7fa7af0b71828c8b73010fb.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501THE EFFECTS OF FIBERGLASS ON THE THERMAL INSULATION PROPERTIES OF INTUMESCENT COATING1123693310.21608/amme.2012.36933ENF.AhmadAssociate Professor, Dept. of Mech. Eng., Universiti Teknologi PETRONAS Malaysia.S.UllahPh.D., Dept. of Mech. Eng., Universiti Teknologi PETRONAS Malaysia.N.AmirPh.D. student, Dept. of Mech. Eng., Universiti Teknologi PETRONAS Malaysia.N. S.OmarUnder graduate student, Dept. of Mech. Eng., Universiti Teknologi PETRONAS
Malaysia.Journal Article20190625ABSTRACT<br />The aim of this study is to investigate the influence of fibreglass addition into the<br />basic intumescent coating formulation towards the enhancement of its thermal<br />insulation properties. The intumescent coating were formulated from expandable<br />graphite (EG), ammonium polyphosphate (APP), melamine (MEL), boric acid (BA),<br />bisphenol A epoxy resin BE-188 (BPA), ACR Hardener H-2310 polyamide amine<br />and fiberglass (FG) of length 3.0mm. Eight different intumescent formulations were<br />developed and the samples were tested for their fire performance by burning them at<br />450 ºC, 650 ºC and 850 ºC in the furnace for two hours. The effects of each fire test<br />at different temperatures; low and high temperature were evaluated. Scanning<br />Electron Microscope (SEM), X-Ray Diffraction technique (XRD) and<br />Thermogravimetric Analysis (TGA) were conducted on the samples to study the char<br />morphology, the crystalline material structure and chemical components and the<br />thermal analysis of the coatings. The FG08 and FG07 formulations with 7.0 grams<br />and 6.0 grams fiberglass provide better results with the enhanced thermal insulation<br />properties of the coatings.https://amme.journals.ekb.eg/article_36933_b915299e47e9ee8c0b7d2352634927c6.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501MICROSTRUCTURAL IMPRINTS IN FAILURE OF POWER PLANT BOILER TUBES1123693510.21608/amme.2012.36935ENU. K.ChatterjeeMetallurgical Consultant & Professor (Retired), Indian Institute of Technology,
Kharagpur 721302, India.Journal Article20190625ABSTRACT<br />Power plant boiler tubes fail in service due to a number of reasons and through<br />various mechanisms. Overheating is a prime cause, and creep, corrosion, erosion<br />and hydrogen damage constitute major mechanisms of failure. Long-term<br />overheating brings about microstructural changes like grain growth, disintegration of<br />pearlite, spheroidization of carbides, graphitization and decarburization leading to<br />loss of strength of the tube material, eventually resulting in stress rupturing or creep<br />rupture through grain boundary void formation. A tube burst resulting from short-term<br />overheating also often bears the imprint of microstructural changes occurring due to<br />transformation of the high temperature phase. Overheating also accelerates the<br />process of hydrogen damage, where the presence of grain boundary fissures bears<br />the evidence of such type of failure. The paper deals with the theoretical aspects of<br />microstructural changes as encountered in boiler tube failures and presents a few<br />case histories to highlight the metallographic features in failures due to overheating<br />and hydrogen damage.https://amme.journals.ekb.eg/article_36935_7774322626a7c5e7e32d67323941c490.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501AMORPHIZATION OF TITANIUM AFTER SURFACE MECHANICAL ATTRITION TREATMENT193693710.21608/amme.2012.36937ENA. E.HannoraSuez Canal University, Faculty of Petroleum and Mining Engineering,
Engineering Science and Mathematics Department, Suez, Egypt, 43721.E. M.DuraiaSuez Canal University, Faculty of Science, Physics Department, Ismailia, Egypt.Journal Article20190625ABSTRACT<br />Titanium substrates were subjected to severe plastic deformation using surface<br />mechanical attrition treatment (SMAT) in a high energy ball mill. It is demonstrated<br />that different mechanical treatments influence the microstructural and mechanical<br />behaviour of the Ti-surface; moreover, solid state amorphization takes place.<br />Amorphization take place concurrently in the surface region, and successive<br />subdivision and amorphization finally result in the formation of well separated<br />nanocrystalline and amorphous phases in the near surface. The average grain size<br />of the nanocrystallites is about ~200 nm after 10 min of SMAT while ~18 nm after 20<br />min.<br />Surface mechanically treatment of Ti-substrates were characterized by the X-Ray<br />Diffraction (XRD) and scanning probe microscope (SPM) using atomic force<br />microscopy (AFM). The microhardness of the mechanically treated Ti-surfaces is<br />improved as a result of surface nanocrystallization.https://amme.journals.ekb.eg/article_36937_d8840ca27dd1185afd12765aa9f3fba7.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501Al/Mg METAL MATRIX COMPOSITE FOR MICRO LAMINATED/NANO PARTICULATE INTERPHASE1103693810.21608/amme.2012.36938ENB. M.RabeehProfessor, Dept. of Eng. and Materials Science, German Univ. in Cairo, Egypt.Y.FouadAssistant Professor, Dept. of Eng. and Materials Science, German Univ. in Cairo,
Egypt.Journal Article20190625ABSTRACT<br />Hot Isostatic Pressing, HIPing, of 6082 Al-alloy and AZ31 magnesium alloy is applied in<br />Al-Mg foil-foil technique symmetrical arranged. However, delamination is a major<br />limitation of lamellar composite structure, an emerging methodology introduced with<br />micro laminated and/or delocalized nano particulate interphase. Mitigation of crack as<br />well as toughening mechanisms is an objective. Parametric study (temperature,<br />pressure and holding time) established for the control of interface/interphase kinetics.<br />HIPing parameters as well as alloying elements have a dominant effect on kinetic of<br />formation interphase. Lamellar metal matrix composites introduced with new micro<br />laminated composite interphase. Micro-plasticity induced the formation of metal flow<br />along with interfacial bonding as well as, low melting depressant (LMD) Zn. LMD<br />induced the localized interphase structure enriched with either Al or Mg. Alloying<br />element segregation tends to form nano composite structure or micro laminated<br />composite in a solid state processing. Parametric study has been prompted to redesign<br />lamellar structure for the control of interphase and interface with no delamination and<br />porosity. Microstructural characterization, mechanical characterization is also<br />established via optical microscopy scanning electron microscopy, energy dispersive Xray<br />spectroscopy and tensile testing. Chemical and mechanical bonding via inter<br />diffusion processing with LMD are dominant for interphase kinetics. Mechanical<br />characterization with interfacial shear strength is also introduced with hardness testing.<br />HIPing processing is successfully applied on 6082 Al-alloy and AZ31 magnesium alloy<br />for both particulate composite or micro-laminated composite processing. The interphase<br />kinetic established through localized micro plasticity, metal flow, LMD and delocalized Al<br />oxide and Mg oxide. The morphology of interphase is cached with interesting structures<br />that need more studies.https://amme.journals.ekb.eg/article_36938_6538ab3ed2f3194551e2204214c6b874.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EMERGING DEVELOPMENT IN AL-ALLOY RECYCLING FOR NONTRADITIONAL ALUMINUM METAL MATRIX COMPOSITES PROCESSING183693910.21608/amme.2012.36939ENB. M.RabeehProfessor, Dept. of Engineering and Materials Science, German University in Cairo, GUC.Journal Article20190625ABSTRACT<br />Growing demands for new emerging materials aimed at introducing nontraditional processes.<br />However, Direct metal oxidation, DIMOX, is applied on Al-alloy, recycling has been<br />prompted to redesign production processes to more cost efficient. Aluminum alloy (scrap) is<br />heated at different temperatures, 950oC, 1000oC, and 1050oC for holding different times (15<br />to 90 minutes) and then poured into metallic mold. The kinetic of formation of hybrid<br />composite is introduced with the effect of alloying elements addition (a-Fe, and Si).<br />Ceramic alumina phase with intermetallic fibers or whiskers established in a residual<br />aluminum matrix. Functionally graded materials, FGM, is also introduced at prolonged<br />holding time (90 min. at 1050oC). In addition to Scanning electron microscopy with energy<br />dispersive X-ray spectroscopy EDX is utilized for micro-structural characterization.<br />Besides, 3-point test is applied on another group of samples. The application of DIMOX on<br />recycled Al-alloy with the addition of alloying elements has a dominant effect on composite<br />micro-structural characterization.https://amme.journals.ekb.eg/article_36939_a8fff7a86bba066937d21ffb6aa2aa59.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501SUPERPLASTICITY: CHARACTERISTICS, ORIGIN, AND UTILIZATION113694110.21608/amme.2012.36941ENFarghalli A.MohamedDepartment of Chemical Engineering and Materials Science
Department of Mechanical and Aerospace Engineering
Department of Civil and Environmental Engineering
University of California, Irvine
Irvine, CA 92697, USAJournal Article20190625SUMMARY<br />Micrograin Superplasticity refers to the ability of fine-grained materials (1μm < d < 10<br />μm, where d is the grain size) to exhibit extensive neck-free elongations during<br />deformation at elevated temperatures. Over the past three decades, good progress<br />has been made in rationalizing this phenomenon. This presentation provides a brief<br />review on this progress in several areas that are related to: (a) the mechanical<br />characteristics of micrograin superplasticity and their origin, (b) the effect of impurity<br />content and type on deformation behavior, boundary sliding, and cavitation during<br />superplastic deformation, (c) the formation of cavity stringers, (d) dislocation<br />activities and role during superplastic flow, and (e) the utilization of superplasticityhttps://amme.journals.ekb.eg/article_36941_cc60c14f882d025873d72d5afb4c2a27.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501FLOW BEHAVIOUR AND MICROSTRUCTURAL EVOLUTION OF TITANIUM Ti-10V-2Fe-3Al ALLOY DURING HOT COMPRESSION TEST1143694210.21608/amme.2012.36942ENH.Al-SalihiARC Centre of Excellence for Design in Light Metals, Monash University,
Melbourne, Australia.C.BettlesARC Centre of Excellence for Design in Light Metals, Monash University,
Melbourne, Australia.B.MuddleARC Centre of Excellence for Design in Light Metals, Monash University,
Melbourne, Australia.Journal Article20190625ABSTRACT<br />Hot workability characteristics and microstructural evolution of Ti-10V-2Fe-3Al alloy<br />have been investigated extensively by means of hot compression tests over a<br />practical range of temperatures from 760°C to 870ºC with strain rates (0.01, 0.1, and<br />1) s-1. Activation energy was obtained (using the peak stress values) to determine<br />the material constants and subsequent Zener-Holloman parameter. The dependence<br />of peak stress on the deformation temperature and strain rate obeys a hyperbolic<br />sine equation with the Zener- Holloman parameter. The results show that higher<br />activation energy was observed at a temperature of 800°C. Microstructural<br />observations of the deformed samples show elongated grains with a recovered<br />structure at lower temperatures. However, recrystallized grains were observed<br />obviously at 810°C, 850°C and 870°C, at a strain rate of 1s-1. Furthermore, there<br />was a gradual increase in the fraction of recrystallized grains as the deformation<br />temperature increased at higher strain rate. Fracture behaviour during hot<br />compression test was also investigated optically in terms of surface cracks at<br />different deformation conditions. In terms of this damage behaviour, surface cracks<br />were observed at 760°C with higher strain rate1s-1.https://amme.journals.ekb.eg/article_36942_48ce30177b54ead195921411fc56b755.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501IMPROVING FRACTURE TOUGHNESS OF CARBON FIBRE/EPOXY COMPOSITE FILLED WITH NANO-CELLULOSE MODIFIED WITH LIQUID RUBBER1123694310.21608/amme.2012.36943ENM. H.GabrFaculty of Engineering, Doshisha University, Japan.+Faculty of Industrial Education, Sohag University, Egypt.N. T.PhongFaculty of Engineering, Doshisha University, Japan.K.OkuboFaculty of Engineering, Doshisha University, Japan.T.FujiiFaculty of Engineering, Doshisha University, Japan.Journal Article20190625ABSTRACT<br />In certain application of fiber reinforced polymer composites fracture resistance is<br />required. The aim of this study was to improve the interfacial adhesion between plain<br />woven carbon fiber (CF) and epoxy matrix filled with 0.3% of nano-cellulose<br />(microfibrillated cellulose-MFC) modified with liquid rubber (carboxyl-terminated<br />butadiene acrylonitrile-CTBN) with different contents. CF/Epoxy/MFC/CTBN<br />composite was characterized by different techniques, namely tensile, fracture<br />toughness (mode I) test and scanning electron microscope (SEM). The results reveal<br />that at a fibre content 0.3% of MFC and 1%CTBN, initiation and propagation<br />interlaminar fracture toughness in mode I improved significantly by 39% and 57%<br />respectively which could be attribute to strong adhesion between filled epoxy, carbon<br />fibre and rubber. This can be explained by SEM at given weight as well; SEM<br />images showed that in front of the tip, fiber breakage during initiation delimination as<br />well as the extensive matrix deformation between fibers accounting for increase<br />fracture toughness.https://amme.journals.ekb.eg/article_36943_9b2cda9a0f4862d7bc43019bca7ae5b5.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501SIMPLIFIED TECHNIQUE FOR RECYCLING OF MICRO AND NANO-COMPOSITE WITH INDUSTRIAL WASTES1113694410.21608/amme.2012.36944ENH.AhmedDr. Eng., Consultant in materials sciences & materials applications, Egypt.Journal Article20190625ABSTRACT<br />In this work, the interest in composite materials to increase their participation in<br />future lightweight structures for building applications in the next generation is<br />presented. Simplified methods for the recycling of composite materials and other<br />industrial wastes were developed. The process should be automatic in all cases.<br />First step is preparation of wastes from different industrial sources by grinding and<br />mixing .Second step is manufacturing of certain iron molds with good inner surface<br />finish, the molds were lubricated by specials oils. The rest step is the design of<br />machine for remanufacturing of disposable material at certain conditions depends on<br />the percentage of additives. All elements are exposed directly to be pressing and<br />shaped by the usual procedures. Finally, each type of material takes different<br />recycling procedures.https://amme.journals.ekb.eg/article_36944_30805a5af4057a3d25c70d73f61a8be6.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DEVELOPMENT OF NEW TECHNIQUE FOR NANO IRRADIATION OF STAINLESS STEELS 3041123694510.21608/amme.2012.36945ENH.AhmedDr. Eng., Consultant in materials sciences & materials applications, Egypt.Journal Article20190625ABSTRACT<br />In this work, new method for surface treatment of the material by laser irradiation was<br />investigated; the experimental works were conducted to study the effect of laser<br />irradiation on the improvement of the mechanical properties of the alloys. Excimer<br />laser at 193nm were used at the same power of 6mJ and repetition rate of 200 Hz.<br />Nanoindentation technique was used to determine film hardness, stiffness and elastic<br />modulus using a nano test instrument form with diamond indenter. The peak loads in<br />the range 1 – 200 mN were used, with variable loading rate in proportion to the peak<br />loads starting at a value of 0.05 mN/s. The hardness and reduced modulus have been<br />determined from these indentation curves using a method originally proposed by<br />Oliver and Pharr, which fits a power-law function to the unloading curve. The<br />qualitative method of microstructure analysis of the samples has been examined<br />before and after laser irradiation at different test conditions to explain the change in<br />mechanical properties according to the change in microstructure features.https://amme.journals.ekb.eg/article_36945_e062714ac3d6278fc4922370a9dc741e.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501RECYCLING OF ALUMINUM ALLOY WITH DIMOX AND RHEOCASTING FUNCTIONALIZE HIGH PERFORMANCE STRUCTURAL FOAM COMPOSITE193694710.21608/amme.2012.36947ENB. M.RabeehProfessor, Dept. of Engineering and Materials Sci., German Univ. in Cairo, Egypt.Journal Article20190625ABSTRACT<br />Great efforts are aimed towards the synthesis and the development of structural<br />composite materials. Direct metal oxidation, DIMOX introduced for hybrid composite<br />processing. However, oxidation temperatures around 1100oC lead to the formation<br />of porous ceramic materials. To utilize this porosity intentionally for foam production,<br />a new approach based on synergetic effect of alloying elements, DIMOX and<br />semisolid (rheocsting) processing is developed. A semisolid reaction, rheocasting is<br />introduced to control porosity shape and size. Aluminum alloy 6xxx (automobile<br />scrap pistons) is recycled for this objective and DIMOX at 1100oC for 30 min, then<br />rheocasting, at 750oC for 30 minutes. The effect of a-Fe powder, Mg powder, and<br />Boric acid powder established for the objective of a hybrid structural metal matrix<br />composite in bulk foam matrix. The kinetic of formation of hybrid metal matrix foam<br />composite is introduced. Microstructural and mechanical characterization established<br />for high performance Aluminum foam hybrid composite materials.https://amme.journals.ekb.eg/article_36947_1d9733534f599dfa2f807d6b311ebf5f.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EFFECT OF PROCESSING PARAMETERS ON MECHANICAL PROPERTIES OF 4.2% Ni – 1.8% Fe – 0.5% Co (wt %) TUNGSTEN HEAVY ALLOY1113694810.21608/amme.2012.36948ENI. A.Abdel-AtyEgyptian Armed Forces.G. M.AbdoEgyptian Armed Forces.M. TolbaSallamEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />Tungsten heavy metal alloys (WHA) with elemental metal powders of tungsten,<br />nickel, iron, and cobalt which correspond to a chemical composition of 93.5% W-<br />4.2% Ni-1.8 Fe-0.5% Co (wt.%) were mixed in milling machine for two hours. The<br />mixture was then subjected to uniaxial compaction varied from 60 MPa up to 180<br />MPa. Sintering of specimens was carried out in a Vacuum sintering furnace.<br />Sintering temperature was varied from 1420°C up to 1550°C while sintering time was<br />changed from 60 minutes up to 120 minutes.<br />Sintered density, hardness, and impact tests were performed to find out the effect of<br />processing parameters (compaction pressure, sintering temperature, and sintering<br />time) on the mechanical and physical properties of the adopted tungsten alloy. It was<br />found that the a compaction pressure of 120 MPa and a combination of sintering<br />parameters of (1450°C for 120 minutes) or (1520°C for 60 minutes) can provide<br />optimum mechanical and physical properties of this alloy.https://amme.journals.ekb.eg/article_36948_b5d7174527e87e963c87506ea71392bc.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501FINITE ELEMENT MODELLING OF DAMAGE FRACTURE AND FRETTING FATIGUE1143694910.21608/amme.2012.36949ENM.Abdel WahabProfessor, Dept. of Mech. Const. and Production, Ghent University, Belgium.I.HilmyAssistant professor, MME Dept, Faculty of Engineering, IIUM, Malaysia.T.HafizGraduated PhD student, Faculty of Eng. and Phys. Sci., University of Surrey, UK.R. HojjatiTalemiGraduate student, Dept. of Mech. Const. and Prod., Ghent University, BelgiumJournal Article20190625ABSTRACT<br />This paper summarises the research carried out to develop Finite Element (FE)<br />modelling and predictive techniques for damage, fracture, fatigue and fretting fatigue<br />problems. A damage model is developed based on Continuum Damage Mechanics<br />and integrated within FE code. It is then used to predict the number of cycles to<br />crack initiation in adhesively bonded joints. Furthermore, crack propagation algorithm<br />is programmed within FE code using the principles of Fracture Mechanics and Paris<br />law. The effect of mode mixity on crack propagation is taken into account using a<br />Double Cantilever Beam (DCB) test specimen. Moreover, FE model of fretting<br />fatigue aluminium test specimen is carried out in order to study the stress distribution<br />and predict the crack propagation fatigue lifetime. Fretting fatigue problems involve<br />two types of analyses; namely contact mechanics analysis and damage/fracture<br />mechanics analysis. Both analyses are performed in FE code and the stress<br />distribution along the contact surface between the two bodies is obtained and<br />analysed. Furthermore, crack propagation analysis under fretting fatigue condition is<br />presented. In most cases, the numerical results are compared to experimental ones.https://amme.journals.ekb.eg/article_36949_2ff510c0e73f21bd2a2caee43c90e558.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ACOUSTIC EMISSION APPLIED TO SLUG VELOCITY DETERMINATION IN TWO PHASE FLOW1103695110.21608/amme.2012.36951ENM.AlssayhGraduate student, School of Engineering, Cranfield University, Cranfield, Beds MK43 0AL, UK.A.AddaliAssociate Professor, School of Engineering, Cranfield University, Cranfield, Beds MK43 0AL, UK.D.MbaProfessor, School of Engineering, Cranfield University, Cranfield, Beds MK43 0AL, UK.Journal Article20190625ABSTRACT<br />Two phase flow is a common phenomenon in petroleum and chemical engineering.<br />An important feature used to describe two phase flow is the flow regime which varies<br />depending on the individual velocities of the components within the two-phase flow.<br />One of these regimes, the slug regime, can create significant pressure fluctuations<br />that compromise the integrity of the transporting structure (pipes, separators, etc.).<br />This is in addition to other unwanted effects such as flooding at the receiving end, an<br />increase in deposits of hydrates, and corrosion. Under such circumstances the<br />detection of the slug and its associated characteristics are vitally important to the<br />operator.<br />This experimental study investigates the application of Acoustic Emission (AE)<br />technology for detecting slug velocity in two phase (gas/liquid) flow. It is<br />demonstrated that slug velocity can be determined using acoustic emission sensors.https://amme.journals.ekb.eg/article_36951_8f225dca8664d735b3f9a6641def18b2.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501MONITORING SAND PARTICLES IN TWO-PHASE FLOW WITH ACOUSTIC EMISSION1153695510.21608/amme.2012.36955ENM. E.El-AlejSchool of Engineering, Cranfield University, Cranfield, Bedfordshire, MK43 0AL,
U.K. corresponder author.D.MbaSchool of Engineering, Cranfield University, Cranfield, Bedfordshire, MK43 0AL,
U.K.T.YanSchool of Engineering, Cranfield University, Cranfield, Bedfordshire, MK43 0AL,
U.K.Journal Article20190625ABSTRACT<br />This paper presents an experimental investigation using acoustic emission (AE)<br />technology to monitor sand transportation in two-phase flow. The initial investigation<br />consisted of a preliminary experiment where a single sand particle was dropped from<br />a height onto metal plates to provide a basis for monitoring particle impingement on<br />metal pipes in two-phase or three-phase flow systems. Further investigations were<br />undertaken on two phase (air-sand) flow in a horizontal pipe for varying Superficial<br />Gas Velocities (VSG). The objective of this research programme is to develop a<br />simple, non-invasive technique for monitoring of sand particle concentration levels in<br />multi-phase flow conditions. The experimental findings show that AE absolute energy<br />can be correlated with the size of sand particles, number of sand particles and VSG.https://amme.journals.ekb.eg/article_36955_ae7fdb7b4fc609ffdfa69b76705c0f7b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501THERMOMECHANICAL FATIGUE BEHAVIOR OF BURNISHED 7075–T6 ALUMINUM ALLOY1113695810.21608/amme.2012.36958ENA. A.Abo El-NasrAssociate Professor, Dpt. of Mech. Engineering, College of Engineering, Qassim, University, Buraidah 51452, Saudi Arabia, On leave from Dpt. of Production Engineering and Mechanical Design, Faculty of Engineering, Menoufiya University, EGYPT.Journal Article20190625ABSTRACT<br />This paper presents the results of series of isothermal and thermomechanical fatigue<br />(TMF) tests of unburnished and burnished 7075-T6 Al specimens. A designed roller<br />burnishing tool was employed to improve the strength of the surface layer of the<br />fatigue specimens. The fatigue stresses were developed in the specimens by<br />combining constant amplitude rotating bending stresses along with constant<br />temperature variation. Isothermal (ITF) and TMF tests were conducted on a rotary<br />bending fatigue testing machine. In ITF tests, two different constant temperatures<br />were used namely: 523 and 623 K. For TMF tests, a constant temperature variation<br />between 523 and 623 K was applied. All these tests were conducted at a constant<br />operating speed of 1200 rpm.<br />The present results revealed that roller burnishing processes have played a<br />significant role in increasing the fatigue lifetimes for both ITF and TMF specimens.<br />The enhanced fatigue strength of the burnished specimens was attributed to the<br />overall increase in the surface layer strength which may delay fatigue crack growth<br />from the surface. Two distinct fatigue fracture regions were observed: region I and<br />region II. In region I, the fracture surface is associated with the formation of fatigue<br />striations. In region II, the fracture surface is covered with surface dimples. This<br />indicates that local strain softening mechanism has dominated the final stage of<br />fatigue failure. Extensive effort has been paid at investigating the fracture surface of<br />ITF and TMF specimens.https://amme.journals.ekb.eg/article_36958_9bd3cc2d0af30fadeae9586d4216f816.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ROLLER AXLE ENHANCEMENT FOR TRACK GUIDE DESIGN1103696010.21608/amme.2012.36960ENM. E.Abo-ElnorEgyptian Armed forces.Journal Article20190625ABSTRACT<br />Track rollers are usually subjected to heavy stresses during guide and launching<br />processes. Design of such roller systems to withstand high dynamic loads during<br />guiding and launching processes may lead to massive structure such in mobile<br />bridge launcher. The feature-based modeling technology in computer aided design<br />(CAD) has been widely studied, which greatly facilitates the manufacture of the<br />design. In this study computer aided engineering (CAE) techniques was used in<br />design of a smart bridge launcher which insure satisfaction distribution of the applied<br />dynamic loads during launching and enhancing roller system design to cover<br />overestimated manufacturing tolerances deformations. Results show that roller<br />system design has significant effect on rolling resistance and overall launching<br />process.https://amme.journals.ekb.eg/article_36960_0dc058cbcba114023aa6445dbe99481f.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501OIL REGIME MONITORING IN HELICAL GEARS USING ACOUSTIC EMISSION1103696310.21608/amme.2012.36963ENM.HamelCranfield University, School of Engineering, Cranfield, Bedfordshire, M43
0AL, UK.A.AddaliCranfield University, School of Engineering, Cranfield, Bedfordshire, M43
0AL, UK.D.MbaCranfield University, School of Engineering, Cranfield, Bedfordshire, M43
0AL, UK.Journal Article20190625ABSTRACT<br />Gear lubrication is critically important to maintaining the integrity of operating gears,<br />the lubricant also protects asperity contact at the gear mesh thereby protecting the<br />gears from a deterioration process and surface failures. In this paper, the<br />investigation was centred on the application of the acoustic emissions (AE)<br />technology for monitoring the influence of oil film thickness variation on gear contact<br />and characterising the oil lubrication regimes in helical gear mesh. This investigation<br />employed a back-to-back gearbox test-rig with oil-bath lubrication. The results have<br />demonstrated a clear relationship between AE activity, operating temperature and<br />specific film thickness. The findings encourage the use of AE techniques to detect<br />and quantify the lubrication regimes during gear meshing.https://amme.journals.ekb.eg/article_36963_7df0b3f704769ccd0d392f0d3f670165.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501AXLE DIFFERENTIAL LOADING SPECTRA ASSESSMENT AND RATING OF ITS GEARING LOAD CAPACITY1123696510.21608/amme.2012.36965ENZ.DejlProfessor, VSB-Technical Univ. of Ostrava, Czech Republic.M.NemcekProfessor, VSB-Technical Univ. of Ostrava, Czech Republic.V.MoravecProfessor, VSB-Technical Univ. of Ostrava, Czech Republic.Journal Article20190625ABSTRACT<br />This contribution deals with the methodology of a lifetime calculation for gearings of<br />automobile differentials in bending and a contact. Basis of a calculation is an<br />operating loading spectrum whose determination for a differential is very difficult. In<br />this contribution a procedure for a determination of a hypothetic loading spectrum by<br />the mathematical formula with an exploitation of an experiment is published. A<br />calculation of a contact stress and a bending stress in the root is also made by using<br />modified techniques in accordance with appropriate standards. An assessment of<br />gearing service life is based on a calculation of an intensity of damages using<br />Haibach’s theory of a cumulating of damages. But there's no point in to use this<br />method for differential gearing. The new procedure is designed – this new procedure<br />evaluates loading capacity of gearing by a utilization of an ultimate or reliable<br />recommended safety factors which are subjected to the endurance limit.https://amme.journals.ekb.eg/article_36965_0ab4664b1e396cdb339a9a83e097df0a.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501MONITORING NATURAL PIT PROGRESSION ON A SLOW SPEED THRUST BEARING WITH ACOUSTIC EMISSION193696810.21608/amme.2012.36968ENM.ElforjaniAssistant Prof., School of Engineering, Cranfield University, Cranfield, Bedfordshire,
MK43 0AL, UK.D.MbaProfessor, School of Engineering, Cranfield University, Cranfield, Bedfordshire,
MK43 0AL, UK.Journal Article20190625ABSTRACT<br />This paper presents results of the use of AE signatures to detect the on-set and<br />propagation of cracks associated with a thrust bearing race. To facilitate the<br />investigation a special purpose built test-rig was employed which allowed for<br />accelerated crack initiation on a bearing race. It is concluded that sub-surface<br />initiation and crack propagation is detectable with AE technology. The results<br />revealed that selecting the AE technique can significantly improve defect<br />identification in comparison to conventional methods of analysis.https://amme.journals.ekb.eg/article_36968_6d8521a74e0013042ce5c16294a45887.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DESIGN AND PRODUCTION OF SMALL TAILLESS UNMANNED AERIAL VEHICLE1263697010.21608/amme.2012.36970ENM. Y.ZakariaEgyptian Armed Forces.M. M.AbdallahEgyptian Armed Forces.M. A.ElshafieEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />The military has shown the most recent interest in small UAVs (SUAVs) for many<br />reasons. We developed a tailless small UAV (flying wing) for military application<br />(SAKR 2) and short range reconnaissance. SUAV is much more portable than its<br />large counterparts and requires only one operator. A smaller reconnaissance plane<br />can assess ground targets at a closer range without being detected. Most SUAVs<br />use electric motors for advantages as it is affected less by the environmental<br />circumstances, lower weight, less vibration and having lower cost. Also an SUAV is<br />less expensive and can be considered a disposable asset. Our design philosophy is<br />based upon improving aerodynamic features, surveillance capability, and controlling<br />the systems autonomously. To fulfill the mission requirements we designed a tailless<br />planform flying wing with 120 cm wingspan, flying at a maximum speed of 30 m/s<br />and about 3 kg take-off weight. Two identical prototypes was fabricated and tested<br />under several flight conditions using remote control to examine flight stability and<br />performance. A commercial autopilot and short range video link was integrated to the<br />SUAV to complete the unmanned system. The designed SUAV succeed to perform<br />20 minutes flying in stabilized mode with circle pattern and appeared to have<br />accepted navigational accuracy using FY-3ZT autopilot.https://amme.journals.ekb.eg/article_36970_ae5a72b41e89952d89f5787817f09f82.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501PROCEDURES FOR MATHEMATICAL MODELING OF SMALL UNMANNED AERIAL VEHICLES1123697210.21608/amme.2012.36972ENA. S.ElharounyM. Sc. Student, Dept. of Mechatronics, Faulty of Eng., Ain Shams Univ., Cairo, Egypt.A. M.YoussefEgyptian Armed Forces.M. Y.ZakariaEgyptian Armed Forces.M. M.Abdel-HameedProfessor, Dept. of Mechatronics, Faulty of Eng., Ain Shams Univ., Cairo, Egypt.Journal Article20190625ABSTRACT<br />In the past few years, the unmanned air vehicle (UAV) has found diverse<br />applications for both civil and military missions. To achieve the stated mission, the<br />vehicle needs to have a flight control system. For designing the control system, the<br />flight control engineers must first develop a dynamic aircraft model and verify its<br />accuracy. Dynamic characteristics of an aircraft are normally described in terms of its<br />stability and control derivative values. These values are determined either<br />experimentally; using flight tests or wind tunnel, or mathematically using<br />computational fluid dynamics (CFD). The experimental approach is generally very<br />accurate, but time consuming and expensive. The CFD method takes lots of CPU<br />time and provides less precision than the wind tunnel testing. In this paper, USAF<br />Digital DATCOM computer program is used to provide estimation of aerodynamic<br />stability and control characteristics. Even though DATCOM provides less precision<br />than CFD and wind tunnel tests, it works much more efficiently by reducing<br />considerable computing time and design cost. Stability and control coefficients and<br />derivatives obtained from DATCOM can be used to calculate the coefficients of<br />state-space matrices. The resulting linear model can then be used for control design<br />tasks. This paper discusses the step by step procedure for obtaining mathematical<br />models for small UAVs. This procedure is then applied for modeling a remote<br />controlled UAV called "Sky Raider Mach 1".https://amme.journals.ekb.eg/article_36972_f7c268bde93ec49ceb1560d51b805ea2.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501AN EXPERIMENTAL STUDY ON TURBULENT EMULSION (OIL-IN-WATER) FLUID FLOW THROUGH CURVED DIFFUSER1203697510.21608/amme.2012.36975ENW. A.El-AskaryAssoc. Professor; Mechanical Power Engineering Dept., Faculty of Engineering,
Menoufiya University (Corresponding author), Tel.: +2-01005255817, +2-048-3486965;
Fax: +2-048-2235695.K. A.IbrahimMechanical Power Engineering Dept., Faculty of Engineering, Menoufiya University.E.WahbaMechanical Power Engineering Dept., Faculty of Engineering, Menoufiya University.H. A.OmaraMechanical Power Engineering Dept., Faculty of Engineering, Menoufiya University.Journal Article20190625ABSTRACT<br />The paper presents a comprehensive experimental study on emulsion (oil-in-water) fluid flow<br />through curved diffusers. The experimental setup has been designed and constructed in the<br />fluid mechanics laboratory of the faculty of engineering, Menoufiya University to perform the<br />measurements which have been carried out on five models of curved diffusers. The<br />measurements of pressure distributions along the outer and inner walls of the curved diffuser<br />have been performed for different area ratios, different curvature ratios (ratio of centerline<br />arc radius to inlet width), different inflow Reynolds numbers and different emulsion holdup<br />(ratio of oil volume to emulsion volume), while the oil concentration has been varied from 0%<br />to 20% by volume. The experimental work has been carried out using two sets of oil-in-water<br />emulsions; the first is stable oil-in-water (o/w) emulsion using Sodium Dodecyl Sulfate (SDS)<br />emulsifier and the second is unstable o/w emulsion at different holdup values. The energyloss<br />coefficients for each model are based on detailed measurements of the wall pressure<br />distributions along walls of the curved-diffuser models including long upstream and<br />downstream tangents. The energy-loss coefficient data have been plotted versus of<br />Reynolds number at different concentrations.<br />New results on energy-loss coefficient during flow of unstable and stable oil-in-water<br />emulsions through curved diffusers have been reported in the present paper. The diffuser<br />energy-loss coefficient is strongly affected by the geometrical parameters of diffuser,<br />Reynolds number and emulsion holdup. Generally for the flow in curved diffusers, the<br />resistance coefficients for stable and unstable (oil-in-water) emulsions are higher than that of<br />pure-water flow. It is also noticed that the unstable o/w emulsion exhibits lower values in loss<br />coefficient compared with that given for stable o/w emulsion.<br />General correlation of the loss coefficient (not previously considered) for the present cases<br />exploring the ranges of geometrical parameters, inflow condition and Reynolds number<br />conditions is extracted from the present experimental study.https://amme.journals.ekb.eg/article_36975_edf6a9da4d1041630d4066c915e4d429.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EXPERIMENTAL AND NUMERICAL STUDIES ON HEAT TRANSFER AND FLUID FLOW IN A DUCT FITTED WITH INCLINED BAFFLES1283697710.21608/amme.2012.36977ENW. A.El-AskaryAssoc. Professor; Mechanical Power Engineering Dept., Faculty of Engineering,
Menoufiya University (Corresponding author), Tel.: +2-01005255817, +2-048-3486965;
Fax: +2-048-2235695.A.Abdel-FattahMechanical Power Engineering Dept., Faculty of Engineering, Menoufiya University.Journal Article20190625ABSTRACT<br />Experimental and numerical studies of heat transfer and the frictional head loss of<br />turbulent flow in a duct with a heated upper surface are performed in the present<br />paper. Four different arrangements are considered (case 1: without baffles, case 2:<br />one perforated baffle on the upper wall and one solid baffle on the lower wall, case 3:<br />one perforated baffle on the upper wall and one perforated baffle on the lower wall<br />and case 4: two perforated baffles on the upper wall). A numerical code developed<br />by the present authors is simultaneously presented including four different<br />turbulence models; namely: the standard k −e , the modified k −e including<br />streamline curvature, the renormalization group model (RNG model) and the ¢ − f 2 v<br />model. The last one shows the best verified results compared with the other models,<br />so ¢ − f 2 v model is considered in all computations. The presence of baffles<br />enhanced the heat transfer relative to the smooth-wall duct. Finally, pressure loss<br />and temperature drop along the test section are employed to evaluate the hydraulic<br />and thermal performances of the duct at different Reynolds numbers. It is found<br />experimentally and numerically that the perforation and position of baffles have a<br />significant effect in the pressure loss and internal cooling of the duct.https://amme.journals.ekb.eg/article_36977_74587e7e0b225697b065aeb940ec29a1.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ON THE EFFECTIVENESS OF POROSITY ON TRANSIENT FLOW OF A VISCOELASTIC FLUID WITH TEMPERATURE DEPENDENT VISCOSITY UNDER AN EXPONENTIAL DECAYING PRESSURE GRADIENT1133698010.21608/amme.2012.36980ENH. A.AttiaProfessor, Dept. of Engineering Mathematics and Physics, Fayoum University, El-
Fayoum-63514, Egypt.M. E. S.AhmedProfessor, Dept. of Engineering Mathematics and Physics, Fayoum University, El-
Fayoum-63514, Egypt.K. M.EwisLecturer, Dept. of Engineering Mathematics and Physics, Fayoum University, El-
Fayoum-63514, Egypt.I.HamdyLecturer, Dept. of Engineering Mathematics and Physics, Fayoum University, El-
Fayoum-63514, Egypt.Journal Article20190625ABSTRACT<br />The transient flow and heat transfer through a porous medium of a non-Newtonian<br />viscoelastic fluid between two infinite horizontal porous plates is studied considering<br />a temperature dependent viscosity. The fluid is subjected to a uniform suction from<br />above and a uniform injection from below whereas a uniform and exponential<br />decaying pressure gradient is applied in the axial direction to drive the fluid motion.<br />The plates are kept at two different invariant temperatures. The equations of motion<br />and the energy equation including the dissipations are solved numerically using finite<br />differences to yield the velocity and temperature distributions for various values of<br />the included physical parameters.https://amme.journals.ekb.eg/article_36980_dd321be469000dd7d1a85044225d59c1.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ON STEADY MHD FLOW AND HEAT TRANSFER OF A NON-NEWTONIAN FLUID ABOVE A ROTATING POROUS DISK WITH ION SLIP AND OHMIC HEATING1173698310.21608/amme.2012.36983ENH. A.AttiaProfessor, Dept. of Engineering Mathematics and Physics, Fayoum University, El-
Fayoum-63514, Egypt.M. E. S.AhmedProfessor, Dept. of Engineering Mathematics and Physics, Fayoum University, El-
Fayoum-63514, Egypt.K. M.EwisLecturer, Dept. of Engineering Mathematics and Physics, Fayoum University, El-
Fayoum-63514, Egypt.I.HamdyLecturer, Dept. of Engineering Mathematics and Physics, Fayoum University, El-
Fayoum-63514, Egypt.Journal Article20190625ABSTRACT<br />The steady flow of an electrically conducting non-Newtonian fluid due to the rotation<br />of an infinite porous disk is studied with heat transfer with the inclusion of the ion slip<br />as well as Ohmic heating. An external uniform magnetic field is applied<br />perpendicular to the disk while a uniform suction or injection is imposed through the<br />porous disk. The governing nonlinear momentum equations and energy equations<br />are solved using the finite difference method. The results indicate the important<br />effect of the ion slip and the non-Newtonian fluid characteristics on the velocity and<br />temperature distributions.https://amme.journals.ekb.eg/article_36983_cb69c120f0d024c641787628c1f7a3f3.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DYNAMIC AND STEADY-STATE ANALYSIS OF SPLIT SPOOL FLOW DIVIDER VALVE1133698710.21608/amme.2012.36987ENM.MetwallyEgyptian Armed Forces.A. S.Abou El-AzmEgyptian Armed Forces.I.El-SherifEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />Flow divider valve is a critical hydraulic component for which it used to synchronize<br />actuators motion in a predetermined ratio. The flow divider valve types divided into a<br />gear type flow divider and a spool type flow divider valve in which the spool has a rigid<br />connection between the two ports. As a special construction, here, a split type spool<br />flow divider has been studied to investigate the effects of special features on the static<br />and dynamic characteristics of the flow divider valve.<br />The construction of a special type flow divider valve, split spool type, has a<br />compensating spool/orifice mechanism to maintain equal pressure drops across the<br />valve metering orifice regardless of the change in system load. This split spool flow<br />divider valve thought to have a low inertia effect and enhanced valve response.<br />In the present work, the static and dynamic characteristics of this special type flow<br />divider valve, split spool valve, have been studied at different load pressures.<br />Experimental test rig has been established to investigate the effect of system pressure<br />on the static characteristic of the special flow divider valve. A mathematical model has<br />been carried out to study static and dynamic characteristics of the flow divider valve; the<br />model has been verified by direct comparisons with the experimental results.<br />For the dynamic response of the split spool flow divider; with the increase of the supply<br />flow rates at the same load pressure, split spool flow divider valve spools displacements<br />will increase equally in both spools at the same given response time. The supply flow<br />rate is equally divided between the two outlets ports of the split spool flow divider valve<br />will reach the half of the supply flow rate at rate increased with the increase of the supply<br />flow rate.<br />The comparison between experimental and mathematical model has a good agreement<br />for the studied system pressures up to 50 bars. It has been found that this special type<br />flow divider, split spool type, has a low inertia effect and enhanced valve response at the<br />studied load pressure regimes.https://amme.journals.ekb.eg/article_36987_45ac2776582ee8bc02c1cb73d7ece28c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DYNAMIC BEHAVIOR OF AN ANTISKID BRAKING SYSTEM1203699310.21608/amme.2012.36993ENA. H.DrazEgyptian Armed Forces.M. G.RabieProfessor of Mech. Engineering, Modern Academy for Engineering and Technology.A. I.Abdel-AzizDr., Faculty of Engineering, Ain Shams University.M. S.DwidarProfessor, Faculty of Engineering, Ain Shams University.Journal Article20190625ABSTRACT<br />This paper is dedicated to investigate the static and dynamic behavior of a hydro<br />mechanical anti-skid braking system. The system consists of a pilot operated<br />pressure reducing valve and a hydro mechanical anti-skid control unit. The system is<br />designed to fulfill the essential requirements of the anti-skid braking system. The<br />steady state and transient performance of the system and its basic components were<br />investigated considering different operating conditions. Detailed nonlinear<br />mathematical models for the system and its components were deduced considering<br />the tire-ground interface. These mathematical models were used to develop Simulink<br />computer simulation programs. The simulation programs were used to investigate<br />the effect of the constructional and operational parameters on the dynamic behavior<br />of the pilot operated pressure reducing valve; mainly the variation of inlet pressure,<br />spring stiffness, damper radial clearance. The operating characteristics of the<br />braking system with the hydro mechanical anti-skid control unit was investigated and<br />analyzed for the cases of driving over dry and wet concrete pavement. The results<br />are presented and discussed.https://amme.journals.ekb.eg/article_36993_448fed2d66df3af91b799516efb8b526.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501NATURAL CONVECTION WITHIN AN ARBITRARILY ORIENTED ECCENTRIC ANNULUS1193699510.21608/amme.2012.36995ENF. M.MahfouzAssociate professor, Dept. of Mech. Power, Menoufia University, Egypt.Journal Article20190625ABSTRACT<br />In this paper, the natural convection within an annulus formed between two eccentric<br />circular cylinders has been numerically investigated. The annulus is placed<br />horizontally and heated isothermally from its inner wall while its outer wall is<br />isothermally cooled. The resulting laminar natural convection flow within the annulus<br />is predicted at different orientations of the annulus symmetry line, ASL. The full<br />governing equations are solved numerically using Fourier Spectral method. The<br />process of heat convection within the annulus is dependent on Rayliegh number,<br />Prandtl numbers, outer to inner cylinder radius ratio, eccentricity and angle of<br />inclination of ASL to the horizontal, l . The Prandtl number and radius ratio are fixed<br />at 0.7 and 2.6, respectively. The Rayleigh number is taken within the range up to<br />105, while l is varied from horizontal position(l =0) to vertical position (l = 90). The<br />results for mean Nussult number are obtained and discussed together with the<br />details of both flow and thermal fields. The study has shown that for a given value of<br />Rayleigh number as l increases the steady mean Nusselt number increases for<br />negative eccentricities while it deceases for same but positive eccentricities. The<br />study has also shown that for same RaL and l≠0, the rate of heat transfer in the<br />annulus is higher in case of negative eccentricities than that for same positive<br />eccentricities.https://amme.journals.ekb.eg/article_36995_5ac32cfea30d50e316ee048953b1262a.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501COMPUTATIONAL FLUID DYNAMIC ANALYSIS OF A THREE DIMENSIONAL LASER SCANNED PROPELLER USING CFX1143699810.21608/amme.2012.36998ENM. M.ShaheenEgyptian Armed Forces.O. E.Abdel-HamidEgyptian Armed Forces.M. A.El-LatifEgyptian Armed Forces.W. A.WabaEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />Conventional techniques used for measuring propellers geometric parameters are<br />either destructive or in accurate or even time consuming. The outer surface of a two-<br />Bladed wooden propeller of a powered Para-Parachute was scanned using a three<br />dimensional laser scanner. A cloud of points has resulted out of the scanning<br />process. Sections were taken in the cloud of points to draw the airfoil profiles at<br />certain radii stations of the propeller, and then they were used to build a CAD model<br />using CFX blade generator.<br />Before manufacturing a prototype a computational fluid dynamic analysis has been<br />performed using CFX blade Gen+ in order to validate the measured data, the<br />analysis of the inflow and outflow properties were used to calculate the thrust of the<br />propeller showing results that satisfies the propeller available data. A prototype has<br />been manufactured depending on the geometrical data obtained by laser scanning<br />and a flight test has been performed where the propeller succeeded to generate the<br />thrust required by the Powered Propeller to take off with its payload.https://amme.journals.ekb.eg/article_36998_cf79997180bad0224329b07f1dd823f5.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501HIGH-ORDER ACCURATE SCHEMES AND LES WITH APPLICATIONS IN AERO-ACOUSTICS113700010.21608/amme.2012.37000ENChrisLacorProf. Dr., Chairman Research Group Fluid Mechanics and Thermodynamics, Dept.
Mechanical Engineering, Vrije University in Brussels, Belgium.Journal Article20190625Abstract<br />High-order schemes and Large Eddy Simulation (LES) are essential ingredients of<br />Aero-acoustics solvers. In this presentation high-order spectral difference methods<br />are introduced coupled to an efficient Lower-upper symmetric Gauss-Seidel (LUSGS)<br />solver for time integration. The extension of the methodology to LES is<br />discussed and several LES test cases are presented. The use of LES, Linearized<br />Euler and acoustic analogies within a hybrid Aero-acoustics methodology is<br />explained. Several applications illustrating the method, such as noise generation of a<br />3D muffler, are discussed.https://amme.journals.ekb.eg/article_37000_e99c6616c2b134bf81af48bdb8014398.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501NUMERICAL COMPUTATION OF BUOYANCY-DRIVEN FLOW AND HEAT TRANSFER IN VARIOUS ASPECT RATIOS CAVITIES FILLED WITH WATER1183700110.21608/amme.2012.37001ENS. H.HussainCollege of Engineering, Mechanical Engineering Department, Babylon
University, Babylon City, Hilla , Iraq.A. K.HusseinCollege of Engineering, Mechanical Engineering Department, Babylon
University, Babylon City, Hilla , Iraq. Corresponding author.H. H.Al-KayiemMechanical Engineering Department, University Teknologi Petronas, 31750
Tronoh , Perak, Malaysia.H. F.OztopDepartment of Mechanical Engineering, Technology Faculty, Firat University,
Elazig, Turkey.Journal Article20190625ABSTRACT<br />Two-dimensional steady laminar natural convection in a differentially heated cavity<br />filled with water and has various aspect ratios due to buoyancy force effect is<br />analyzed numerically. The governing mass, momentum and energy equations are<br />considered and a finite volume algorithm is used to capture the numerical solution.<br />The left vertical side wall of the cavity is linearly heated while the right vertical one is<br />maintained at constant cold temperature. The bottom wall is maintained at constant<br />hot temperature while the top wall is considered thermally insulated. The Rayleigh<br />number is varied from 103 to 106, while the cavity aspect ratio (W/H) is varied as 0.5,<br />1.0 and 2.0 respectively. Results are presented in the form of streamline and<br />isotherm contours. The results of the present work explain that the natural<br />convection phenomenon is significantly influenced by changing the cavity aspect<br />ratio, so that when the aspect ratio is high the convection effect is week and vice<br />versa. Also, it is found that non-uniform heating in the left vertical sidewall of the<br />cavity plays a major role to improve the heat transfer rates. For uniform and nonuniform<br />heating of the bottom wall and left vertical sidewall respectively, the local<br />Nusselt number at these walls increases from its minimum value at the left edge of<br />these walls toward maximum value at the right edge. While, the average Nusselt<br />number for both left side and bottom walls increases with increasing of Rayleigh<br />number.https://amme.journals.ekb.eg/article_37001_bbd1700515a6382cc095a10901b07dc7.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501GAS PARAMETERS PREDICTION IN THERMAL PULSE FLOW METER1113700510.21608/amme.2012.37005ENV.JingaPh.D. student, Faculty of Material Science and Engineering, Transilvania University, Brasov, România.C.SamoilaProfessor, Faculty of Material Science and Engineering, Transilvania University, Brasov, România.D.UrsutiuProfessor, Faculty of Computing Science and Engineering, Transilvania University, Brasov, România.A. P.CotfasProfessor, Faculty of Computing Science and Engineering, Transilvania University, Brasov, România.Journal Article20190625ABSTRACT<br />This paper will present to the audience a processing and simulation method<br />regarding the theoretical approach of a mathematical model that describes the<br />phenomena taking place inside a new gas flow sensor. Because the working<br />principle of the flow sensor is a simple one – generating with a specific frequency<br />thermal pulses that transfer heat to the annular volume of gas and then, by<br />measuring the gas temperature evolved in time, determining the flow rate, a<br />mathematical model is needed to establish all the parameters that vary during this<br />process. This involved lot of mathematics for solving some parts of the established<br />model. The authors of this paper have proposed the specific software especially<br />developed for simulating the gas flow sensor. The software performs mathematical<br />prediction regarding the gas parameters after the generation of the thermal pulse<br />and the occurrence of heat exchange, more precisely, the evolution of gas speed,<br />temperature, density and pressure. These things are extremely important for the<br />development of this gas flow sensor, by comparing the experimental data with the<br />theoretical results.https://amme.journals.ekb.eg/article_37005_ac72577faa3e728ff15732f04df7f636.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501NUMERICAL SIMULATION OF THE FLOW AROUND A LIGHT AIRCRAFT WING1133701110.21608/amme.2012.37011ENE. E.MusaAssoc. professor, Dept. of Aeronautics, Karary University, Omdurman, Sudan.M. M.AbdullaM. Sc. student, Dept. of Aeronautics, Airframe Design, Karary University,
Omdurman, Sudan.O. A.ElsayedAssistant Professor, Aeronautics Eng. Dpt., Sudan University of Science and
Technology, Khartoum, Sudan.Journal Article20190625ABSTRACT<br />This work aims to study and simulate the behavior of flow over SAFAT-01’s wing<br />using numerical simulation based on solving Reynolds’s Averaged Navier-Stokes<br />equations coupled with K- turbulent model. The wing model is simple rectangular<br />with elliptical ends. In the present work, aerodynamics characteristics and different<br />flow phenomena were predicted at different design conditions (e.g. at different angles<br />of attack) and at Re=5.2×106. The present study analysis the vortices which occur<br />over wing and captured their effective regions at critical design conditions.<br />This study indicates that the maximum lift coefficient for SAFAT-01’s wing is 1.44<br />occurred at stall angle of attack 12o, maximum lift to drag ratio (L/D) is 26 which<br />occurs at -4 o, and the zero lift drag coefficient is 0.0142. To validate this numerical<br />simulation, a typical wing which found in Ref. [3] was analyzed, a comparison<br />between predicted results and available results indicate that this numerical simulation<br />has high ability for predicting the aerodynamics characteristics.https://amme.journals.ekb.eg/article_37011_d3bda9e49e8f52721e3ec04fb2a87958.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ON LOSS MECHANISM THROUGH REACTION TURBINE CASCADE: EFFECT OF SPACE-CHORD RATIO1153701410.21608/amme.2012.37014ENM.GovardhanProfessor, Dept. of Mech. Eng., I.I.T. Madras, Chennai, India.V. V.AnandraoGraduate Student, Dept. of Mech. Eng., I.I.T. Madras, Chennai, India.Journal Article20190625ABSTRACT<br />Investigations on reaction turbine cascade were conducted with the aim of ascertaining<br />the influence of space-chord ratio on secondary flows and losses. The turbine cascade<br />had high deflection reaction blades with a geometric deflection of 820. Structured<br />hexahedral elements were used for meshing. Periodic boundary condition for periodic<br />faces and no slip boundary condition for endwall, blade surfaces were applied.<br />Experimental inlet profile was specified and the SST K- turbulence with transition was<br />used for closure. Five space-chord ratios; namely, S/Ch = 0.42, 0.60, 0.70, 0.84 and<br />1.04 were varied at constant stagger and incidence angles. Space-chord ratio alters<br />blade loading influencing secondary flows characteristics. As space-chord ratio is<br />increased, secondary loss coefficient increases primarily due to the increased blade<br />loading resulting in increased cross channel deflection. Space-chord ratio influences<br />loss levels. There exists an optimum space-chord ratio at which total pressure losses<br />are minimum.https://amme.journals.ekb.eg/article_37014_e948566532846af7a00bbb62fa0fb304.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EFFECT OF AXIAL GAP ON THE AERODYNAMICS OF 1 AND 1.5 STAGE TURBINES1123701810.21608/amme.2012.37018ENR.SubbaraoResearch Scholar, Dept. of Mechanical Engineering, IIT Madras, Chennai, India.M.GovardhanProfessor, Dept. of Mechanical Engineering, IIT Madras, Chennai, India.Journal Article20190625ABSTRACT<br />Axial gap is one of the few important parameters that affect the performance of a<br />turbine. Present work involves the computational study in 1 and 1.5 stage turbines<br />with axial gaps of 15% and 50%. For each axial gap, investigation is done at three<br />flow coefficients; namely, 0.68, 0.78 and 0.96. The turbine components nozzle, rotor<br />and stator are modeled for both the axial gaps. Mid-span pressure distribution of the<br />rotor for the design configuration is compared with the experimental results and found<br />to be in good agreement. Total pressure, axial velocity, entropy and Mach number<br />distributions along with torque are analyzed for all the configurations. Results indicate<br />that the performance of the turbine is dependent on axial gap.https://amme.journals.ekb.eg/article_37018_f0f642e1275f1bacaf177c1a833bd270.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ANALYTIC SOLUTIONS OF INHOMOGENEOUS AND NONLINEAR PROBLEMS OF HEAT CONDUCTION THEORY FOR A LAYER1183702110.21608/amme.2012.37021ENA. N.TyurehodzhayevProfessor, Department of Applied Mechanics and Principles of Machinery
Engineering, the Kazakh National Technical University named after K.I. Satpayev,
Almaty, Kazakhstan.G. A.KaribayevaSenior Lecturer, Department of Higher Mathematics and Physics, Almaty
Technological University, Almaty, Kazakhstan.Journal Article20190625ABSTRACT<br />The article consider inhomogeneous and non-linear heat problems by applying the method of<br />partial discretization of nonlinear differential equations, derived by Professor A. N.<br />Tyurehodzhayev and methods of mathematical physics connected with the use of integral<br />Laplace transforms. The aim of work is to obtain analytical solutions of boundary-value<br />problems of inhomogeneous and nonlinear heat conduction by applying the method of partial<br />discretization of nonlinear differential equations, establishing of regularity of heat distribution<br />in the layer, which describe the differential equations in partial derivatives of parabolic type<br />with variable mechanical and thermal characteristics, in some cases dependent on the<br />unknown function itself. This paper addresses the following objectives: 1) Inhomogeneous<br />problem of heat conduction theory with different dependences of heat conduction coefficient,<br />heat capacity and medium density. 2) Non-linear problem of heat conduction with variable of<br />heat capacity, density and heat conduction coefficient, which depends on the unknown<br />function itself.<br />In regards to the problems of heat-conduction fundamental works are those of A.V. Lykov [4-<br />5], L. M. Belyaev and A. A. Ryadno [6-7], V. S. Zarubin [8]. Among foreign authors, who have<br />been solving the problem of this kind, we note the work of G. Carslaw and D. Jaeger [9], L.A.<br />Kozdoba [10-11], and other heat-conduction investigators.<br />Work of L. I. Kudryashev and N. L. Menshih [12], a series of articles [13-15], etc. are devoted<br />to the nonlinear problems of heat-conduction and methods of their solving. Application of the<br />method of local potential in the heat conduction problems is described in the works of P.<br />Glansdorff and I. Prigogine [16] R. Schechter [17].<br />In this article for the first time three were obtained analytical solutions of new problems of<br />heat conduction with almost random variables and nonlinear thermal characteristics in the<br />layer using the method of partial discretization of nonlinear differential equations of Professor<br />A. Tyurehodzhaev by two variables, along with the integral Laplace transform.https://amme.journals.ekb.eg/article_37021_69efa5c6741cebed4ccb91a5a6b8ea7f.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501PREDICTION OF TOTAL EMISSIVITY OF CO2 IN TROPOSPHERE BY SEVERAL METHODS1113702610.21608/amme.2012.37026ENK. H.ByunProfessor, Dpt. of Mechanical Robotics and Energy Engineering, Dongguk
University, Seoul, Republic of Korea.L. D.ChenProfessor & Director, School of Engineering and Computing Sciences, Texas
A&M University, Corpus Christi, USA.Journal Article20190625ABSTRACT<br />The effects of CO2 ppm in troposphere on both spectral and total emissivity are<br />reviewed using several methods. The compared models are by Hottel [2], Bliss [3],<br />Atwater and Ball [4, 6], wide Band Model by Edwards [5], Yamamoto and Sasamori<br />[6,7], and using HITRAN data base [8]. For spectral emissivity, the results by<br />Yamamoto and Sasamori match well with predictions using HITRAN data base. For<br />total emissivity, the deviations between models are rather large and sometimes more<br />than about 0.05. In general, for a given condition, the upper bound of total emissivity<br />is given by Hottel, and lower bound is given by HITRAN. The predictions by Edwards<br />are in between but near to those of Hottel. The CO2 ppm varied from 300 ppm to<br />600 ppm, temperature varied from 220K to 300K, and pressure from 0.3 to 1.0atm.<br />As CO2 ppm increases, the total emissivity increases. For a given CO2 ppm, the total<br />emissivity increases as the air thickness increases which are also true for both<br />temperature and pressure increase. Around 260K, the total emissivity is less<br />sensitive to increasing temperature than to decreasing temperature. For a given<br />pressure change, the total emissivity values by wide band model changes more than<br />the values by HITRAN. The reverse is true for temperature change.https://amme.journals.ekb.eg/article_37026_d157b2eadd96f8f804dc814ae703f44c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501NOVEL APPROACH FOR WASTE-TO-ENERGY HIGH EFFICIENCY PROCESS1143702910.21608/amme.2012.37029ENN.SamecFull professor, Faculty of mechanical engineering, University of Maribor, Slovenia.F.KokaljSenior lecturer, Faculty of mechanical engineering, University of Maribor, Slovenia.A.LobnikFull professor, Faculty of mechanical engineering, University of Maribor, Slovenia.A.KošakAssistant professor, Faculty of mechanical engineering, University of Maribor,
Slovenia.Journal Article20190625ABSTRACT<br />Waste-to-energy process is essential part of modern and future integrated waste<br />management solutions. The waste-to-energy process using municipal solid waste as<br />a fuel was studied in detail for complete understanding of these phenomena<br />especially in terms of energy conversion into electrical power and the influence on<br />the environment. The goal of our research was to substantially upgrade the waste-toenergy<br />process from grate combustion into gasification for more efficient electrical<br />power production and even lower the negative influence on the environment of the<br />whole process.<br />Our research team has remodeled inclined grate combustion chamber into<br />gasification reactor. The reactor is possible to operate in updraft or downdraft mode<br />enabling the more adequate process adoption based on the input waste<br />characteristics. The produced synthetic gas has relatively high calorific value and<br />temperature, both can be turned into useful heat and electrical power.<br />The complete technology has been equipped with advanced sensors for process<br />control. The most advanced is the utilization of fluorescence high temperature optical<br />sensors for contact free measurement temperatures in gasification reactor.https://amme.journals.ekb.eg/article_37029_17d448e4f58e57b51d6f56537fd42a79.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ASSESSMENT OF DIFFERENT METHODS USED TO ESTIMATE WEIBULL DISTRIBUTION PARAMETERS FOR WIND SPEED IN ZAFARANA WIND FARM, SUEZ GULF, EGYPT1243703310.21608/amme.2012.37033ENH.SalehPhD Student, Libyan Armed Forces.A. S.Abou El-AzmEgyptian Armed Forces.S.Abdel-HadyProfessor, South Valley University, Egypt.Journal Article20190625ABSTRACT<br />The use of wind as an energy source is becoming popular because of its nonpolluting<br />and renewable features. There is an urgent request to develop site-based<br />estimation on wind engineering, which can be used for optimal design of wind<br />turbines and wind farming. The wind speed for Zafarana Project in Suez Gulf,<br />namely Site-3, based on monthly averaged data for one year as well as every 10<br />minutes for two days, one day in summer season and one day one winter season<br />have been analyzed to estimate the most appropriate method to find Weibull<br />distribution parameters for this site. The investigated methods are the mean wind<br />speed method, the maximum likelihood method, the modified maximum likelihood<br />method, the graphical method and the power density method. These methods results<br />have been compared with the provided data to find their accuracy based on the root<br />mean square errors. From the obtained results, the mean wind speed and the<br />maximum likelihood method are recommended in estimating the wind speed<br />distribution for the studied site in Zafarana wind farm.https://amme.journals.ekb.eg/article_37033_42c988f9960e674c867c4e02241cc43d.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501FAILURE ANALYSIS OF WIND TURBINES IN ZAFARANA WIND FARM, SUEZ GULF, EGYPT1203703510.21608/amme.2012.37035ENH.SalehPhD Student, Libyan Armed Forces.A. S.Abou El-AzmEgyptian Armed Forces.S.Abd El-HadyProfessor, South Valley University, Egypt.Journal Article20190625ABSTRACT<br />A detailed analysis of the recoded failure data of the wind turbines in Zafarana wind<br />farm namely Site-3 has been introduced. The failure cost consequences of one of<br />the main components of the wind turbine have been introduced for cost analysis and<br />maintenance planning.<br />The effect of variation of the capacity factor and the down time on failure cost<br />consequences is introduced. The down time has a significant effect on the failure<br />cost consequences of wind turbine components. The failure recoded data have been<br />illustrated for one year for the same site for different wind turbine components while<br />the capacity factor has only effect on gearbox and blade failure cost.<br />For failure rate and reliability analysis, the Weibull distribution has been introduced,<br />the modified maximum likelihood method has been used to evaluate the Weibull<br />distribution parameters. The failure rate and reliability have been studied for different<br />wind turbine components. The initial failure rate after one month (720 h) was 0.0026<br />while the failure rate was 0.0084 at the end of the year (8760h) for the generator<br />critical components.https://amme.journals.ekb.eg/article_37035_e1612333520d4c69e12ab4048e38b604.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501SCORING MODELS FOR PROCESS MONTIORING IN INDUSTRY A MECHATRONIC APPLICATION1143705310.21608/amme.2012.37053ENR. M.ShahinEgyptian Armed Forces.W. M.HusseinEgyptian Armed Forces.A. F.El-SherifEgyptian Armed Forces.H. M.MahgoubEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />To compete on a global level, manufacturers must strive to find new solutions to<br />ensure high product quality while maximizing productivity. One way to address many<br />of the challenges this creates is to turn increasingly to mechatronic design approach<br />and automation. To successfully realize automation, a mechatronic system for online<br />process monitoring is required to take the place of an expert’s judgment. This<br />paper outlines the use of a statistical multivariate technique called Projection to<br />Latent Structure (PLS), and applies it to the monitoring of a machining process as an<br />application. This approach is used to integrate machine tool sensory data from a<br />milling machine. Experiments were conducted on a milling machine under three<br />conditions, sharp, worn and chatter tools. The score models were tested under<br />different conditions with the results showing that the proposed technique can be<br />used for tool wear monitoring and can successfully differentiate between new<br />process conditions.https://amme.journals.ekb.eg/article_37053_01b5ff5622c39674936a2eefed2a2fa3.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501INVESTIGATION OF MODERN CONTROL ALGORITHEMS IN MECHATRONIC SYSTEM1203705710.21608/amme.2012.37057ENH. B.MorsyEgyptian Armed Forces.M. M.El-khatibEgyptian Armed Forces.W. M.HusseinEgyptian Armed Forces.M. H.MahgoubEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />The hovercraft is a fascinating mechatronic system that possesses the unique ability<br />to float above land or water. In designing a mechatronic system, there are many<br />factors should be considered, such as mechanical body, control system and<br />actuators, etc.<br />The objective of the paper is to design, simulate and implement an autonomous<br />model of a small hovercraft. State-space method is used to represent the dynamics<br />of a hovercraft. A real time layered fuzzy navigator for a hovercraft in a dynamic<br />environment is proposed. The system consists of a Takagi-Sugeno-type fuzzy<br />motion planner and a modified proportional navigation based fuzzy controller.<br />MATLAB/Simulink software tool is used to design and verify the proposed algorithm.https://amme.journals.ekb.eg/article_37057_7b7560680b4f0b080e30895c9342658b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501BURIED OBJECT LOCATION BASED ON FREQUENCY DOMAIN MEASURMENTS1113705810.21608/amme.2012.37058ENK. A.ShaabanEgyptian Armed Forces.W. M.HusseinEgyptian Armed Forces.M.SolimanEgyptian Armed Forces.H. M.MahgoubEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />In this paper, wideband ground penetrating radar (GPR) system and a proposed<br />frequency domain data analysis technique are presented for the detection of shallow<br />buried objects such as anti-personal (AP) land mines. The GPR system uses one<br />antenna for transmitting and for receiving and. it operates from 9 GHz to11 GHz.<br />This system is able to acquire, save and analyze the data in the frequency domain.<br />Common Offset technique has been used for acquiring and processing the data.<br />This technique is effective for the rejection of the ground surface clutter. By applying<br />the C-scan scheme, metallic and plastic mines-like targets buried in dry soil will be<br />located.https://amme.journals.ekb.eg/article_37058_b780e5cf41914139a290adc9409127d9.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501A MECHATRONIC SYSTEM FOR COLOR REGISTRATION IN SHEET-FED OFFSET PRINTING183705910.21608/amme.2012.37059ENK. M.TahaM. Sc. student, Dept. of Printing Eng., Military Technical College, Cairo, Egypt.M. A.MetwallyAss. Prof., Dept. of Radar, Military Technical College, Cairo, Egypt.F. M.AhmedAss. Prof., Dept. of Mechanical power, Military Technical College, Cairo, Egypt.G.El-NasharAssoc. Professor, Dept. of Optoelectronics, Military Technical College, Cairo, Egypt.Journal Article20190625ABSTRACT<br />In modern industries, it is important to monitor the output process by a suitable and<br />low cost method. However, the vision-based techniques are the most powerful<br />methods to collect different types of feedback depending on the used image<br />processing algorithm. This paper describes a low cost mechatronic system for color<br />to color registration in sheet-fed offset printing based on color image analysis. The<br />proposed system consists of hardware construction and software algorithm with<br />commonly available techniques. A complementary metal oxide semiconductors<br />(CMOS) sensor is used to capture the image which is processed via the image<br />processing software. The closed loop system control is based on the decision taken<br />by the image analysis algorithm. The proposed mechatronic system succeeded to<br />decrease detecting and correcting time of miss registration compared with the<br />manual process.https://amme.journals.ekb.eg/article_37059_42401a4efcfced80bf6d2727a810f47d.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DESIGN AND IMPLEMNTATION OF HYDRAULIC AUTO-LEVELING CONTROL SYSTEM FOR VEHICLE-BORNE PLATFORM BASED ON PLC1143706210.21608/amme.2012.37062ENH.El-GoharyGraduate Student, Mech. Eng. Dept., Faculty of Eng., Al-Azhar Univ., Cairo, Egypt.E. A.El-KadyProfessor, Mech. Eng. Dept., Faculty of Eng., Al-Azhar Univ., Cairo, Egypt.M. E.ElrefaieProfessor, Mech. Eng. Dept., Faculty of Eng., Al-Azhar Univ., Cairo, Egypt.Journal Article20190625ABSTRACT<br />This paper puts forward hydraulic auto-leveling control system for vehicle-borne<br />platform with four legs based on Programmable Logic Controller. In particular, a<br />Siemens S7-300 (Programmable Logic Controller) PLC, and the accessional<br />hydraulic circuit and control circuit is used. By introducing the theory of auto-leveling,<br />the methods to design the hardware and software of the embedded control system<br />are presented. The system adopts highly accurate two-axis tilt sensor and<br />proportional direction control valves, optimizing auto-leveling strategy. The hardware<br />and software of the embedded system make use of the concept of minimizing the<br />error as possible on tilting axis corresponding to the required accuracy. The tests<br />prove that this auto-leveling control system improves leveling-precision, performance<br />stability of the system, shortens the leveling-time, and satisfies the maneuverability<br />and operating requirements of the vehicle-borne platform in formidable nature<br />conditions.https://amme.journals.ekb.eg/article_37062_9e450c618217c0acbfda719089a54d9b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501SIX STROKE ENGINE ARRANGEMENT163706310.21608/amme.2012.37063ENM. M.GasimSenior lecturer, Faculty of Mech. Eng, Universiti Malaysia Pahang, Kuantan, Malaysia.L. G.ChuiLecturer, Faculty of Mech. Eng, Universiti Malaysia Pahang, Kuantan, Malaysia.K. A.Bin AnwarLab instructor, Faculty of Mech. Eng, Universiti Malaysia Pahang, Kuantan, Malaysia.Journal Article20190625ABSTRACT<br />In six stroke engine, there are additional two strokes, namely another power and<br />exhaust strokes. The engine works through harnessing wasted heat energy created<br />by the fuel combustion. After the combustion stage water is injected into the superheated<br />cylinder. The water explodes into steam and force the piston down. It in turn<br />helps to cool the engine. That resulted in normal levels of power but using much less<br />fuel. It also has the advantage of not requiring an external cooling system. In order to<br />achieve these benefits, major modifications of conventional internal combustion<br />engine must be done. In this paper the modification of the conventional four stoke<br />internal combustion engine is illustrated to convert it into six stroke engine.https://amme.journals.ekb.eg/article_37063_612da2ff6f37ca7fc766d4cf5ed150a5.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501THERMAL PERFORMANCE OF A TWO-PHASE CLOSED THERMOSYPHON1243706410.21608/amme.2012.37064ENM. G.WaselProfessor, Dept. of Mech. Power, Mansoura University, Mansoura, Egypt.M. G.MousaAssociate professor, Dept. of Mech. Power, Mansoura University, Mansoura, Egypt.E. A.El-NegiryLecturer, Dept. of Mech. Power, Mansoura University, Mansoura, Egypt.A. S.El-AdlGraduate student, Dept. of Mech. Engineering, Higher Technological Institute, Tenth
of Ramadan City, Egypt. Tel: +02 01224566764.Journal Article20190625ABSTRACT<br />A two-phase closed thermosyphon (TPCT) is a device for heat transmission consisting<br />of an evacuated tube filled with a certain amount of working fluid. Fluids with<br />nanoparticles (particles smaller than 100 nm) suspended in them are called nanofluids<br />that they have a great potential in heat transfer enhancement. In the present study the<br />thermal performance of conventional two phase closed thermosyphon (CT) and<br />modified thermosyphon (MT) containing a separator in the evaporator section was<br />investigated in case of using distilled water and Al2O3/Water nanofluid as working<br />fluids. The effect of heat input (500 W Q 1000 W), working fluid filling ratio (40% <br />FR 90%), inclination angle (40° 90°), separator diameter (ds = 25mm, 32mm<br />and 40mm) and nanoparticles volume concentration (0.5% Ø 2%) on thermosyphon<br />thermal performance was experimentally investigated. The variation in Nusselt number<br />was taken as an indication to the thermosyphon performance.<br />The results showed that an average increase of 8 % up to 19.5 % in Nusselt number can<br />be achieved when using a separator in the evaporator section with distilled water as a<br />working fluid. Also an average increase of 24.5 % up to 164.5 % in Nusselt number was<br />achieved when using Al2O3/Water nanofluid instead of distilled water for CT. In case of<br />using Al2O3/Water nanofluid in the presence of a separator in the evaporator, an<br />average increase of 75 % up to 197 % in Nusselt number can be achieved. The<br />experimental data are compared to the available data from previous studies and the<br />agreement is found to be fairly good. A correlation was developed for prediction of the<br />Nusselt number taking into consideration the effect of the varying separator diameter.<br />The correlation agrees with the experimental data within ± 19.5% accuracy.https://amme.journals.ekb.eg/article_37064_152d848a867930b7a70be15b192547e2.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501THE VARIATION OF CYCLONE PERFORMANCE WITH THE CYCLONE HEIGHT USING RANS SIMULATIONS1213706810.21608/amme.2012.37068ENK.ElsayedPostdoc Researcher, Department of Mechanical Engineering, Vrije Universiteit
Brussel, Pleinlaan 2 -1050 Brussels- Belgium.C.LacorProfessor, Department of Mechanical Engineering, Vrije Universiteit Brussel,
Pleinlaan 2 -1050 Brussels- Belgium.Journal Article20190625ABSTRACT<br />The effect of the cyclone height (both the barrel and cone) on the performance and<br />flow field pattern has been investigated computationally for six cyclone separators.<br />The results show that the maximum tangential velocity in the cyclone decreases with<br />increasing the cyclone (barrel or cone) height. Increasing the barrel height makes a<br />small change in the axial velocity, whereas increasing the cone height changes it<br />considerably. Increasing the cyclone (barrel or cone) height decreases both the<br />pressure drop and the cut-off diameter. The changes in the performance beyond h/D<br />= 1.8 (Ht/D = 4.3) are small at constant cone height, whereas the performance<br />improvement stops after hc/D = 4.0 (Ht/D = 5.5) at constant barrel height where h is<br />the barrel height, hc is the cone height, Ht is the total cyclone height and D is the<br />barrel diameter. The effect of changing the cone height on the flow pattern and<br />performance is more significant than that of the barrel height.https://amme.journals.ekb.eg/article_37068_45c1ba83d8818d57632a7807b2d55402.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EFFECT OF SCREEN MESH WICK AND AL2O3 NANOFLUID CONCENTRATION ON CIRCULAR HEAT PIPE PERFORMANCE1193707010.21608/amme.2012.37070ENE. A.Abdel-HadiProfessor, Dpt. of Mechanical Engineering, Benha University, Shobra, Egypt.S. H.TaherProfessor, Dpt. of Mechanical Engineering, Benha University, Shobra, Egypt.M. G.MousaAssociate professor, Dpt. of Mechanical Engineering, Mansoura University,
Mansoura, Egypt.S. M.ElshamyLecturer assistant, High institute for engineering and technology, Obour, Egypt.Journal Article20190625ABSTRACT<br />In this paper the experimental study of the behavior of screen wick and nanofluid to<br />improve the performance of a circular heat pipe. Pure water and Al2O3-water based<br />nanofluid are used as working fluids. An experimental setup is designed and<br />constructed to study the heat pipe performance under different operating conditions.<br />The effect of filling ratio, volume fraction of nano-particle in the base fluid, screen<br />mesh as a wick and heat input rate on the thermal resistance is investigated. Total<br />thermal resistance of the heat pipe for pure water and Al2O3-water based nanofluid is<br />also predicted. An experimental correlation is obtained to predict the influence of<br />Prandtl number and dimensionless heat transfer rate, Kq on thermal resistance.<br />Thermal resistance decreases with increasing Al2O3-water based nanofluid<br />compared to that of pure water. The experimental data is compared to the available<br />data from previous work. The range of operating parameter are filling ratio 40% to<br />100%, nanofluid concentration from 0.0% to 2.0%, and heat rate from 8 to 32 watt.<br />The agreement is found to be fairly good.https://amme.journals.ekb.eg/article_37070_d700182bc7670d9275f4649dc5715582.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501INTELLIGENT METHODOLOGY FOR OPTIMAL SELECTION OF NON-TRADITIONAL MACHINING PROCESSES1123707310.21608/amme.2012.37073ENS. A.El-BahloulDemonstrator, Prod. Eng. & Mech. Design Dept, Faculty of Engineering,
Mansoura University, Egypt.H. E.El-ShourbagyAsst. Prof., Prod. Eng. & Mech. Design Dept, Faculty of Engineering, Mansoura
University, Egypt.M. Y.Al-MakkyProf., Prod. Eng. Dept, Faculty of Engineering, Alexandria University, Egypt.T. T.El-MidanyProf., Prod. Eng. & Mech. Design Dept, Faculty of Engineering, Mansoura
University, Egypt.Journal Article20190625ABSTRACT<br />Manufacture of a product in a desired shape and size with specific characteristics<br />and properties depends not only on the design of the product but also on the<br />selection of the appropriate manufacturing process(es) that requires knowledge<br />about various available alternatives. This paper presents a software for selecting the<br />optimal non-traditional machining process(es) from twenty one processes. It has<br />been developed using MATLAB, version (V7.8) release (R2009a), as programming<br />language with the help of graphical user interface (GUI), visual aids, and fuzzy logic<br />toolboxes. The selection procedures are based on elimination and ranking<br />technique, considering important attributes such as workpiece material and shape<br />generation requirements, NTMPs operational capabilities, and NTMPs economical<br />and environmental aspects. Cases of partial suitability of a particular process with<br />respect to the operational requirements and providing unequal importance to them<br />are considered, which increase the accuracy of the proposed software than previous<br />works. An industrial case study, taken from Luxcelis Company, is implemented on<br />the software for verification. Luxcelis Company uses laser machining system for the<br />formation of cooling holes in high pressure turbine blades for aerospace turbine<br />engines.https://amme.journals.ekb.eg/article_37073_479732b7cacd4d177219296264ba8ab0.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501COMPUTER AIDED MANUFACTURING IN FIVE AXES FOR STATOR BLADES1113707510.21608/amme.2012.37075ENA.ButLecturer, Dept. of Materials and Manufacturing Engineering, Mechanical Faculty,
“POLITEHNICA” University of Timisoara, Romania.Journal Article20190625ABSTRACT<br />In this paper, the computer aided manufacturing solution is presented for<br />manufacturing a complex surface of the stator blades in addition to the technology<br />implementation on the CNC machine tools in five axes. The particularities of the<br />ESPRIT CAM software are underlining. In the present work, the last module created<br />by DP Technology (dedicate to manufacturing the impeller) is used. Starting with the<br />import of the CAD model, the technology is elaborated and the NC program is<br />generated. The optimized solution, using two different milling strategies, is<br />underlining the capabilities of the CAM software.https://amme.journals.ekb.eg/article_37075_192a408321095e95ee653dac54ae9b04.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EFFECTS OF MIXING CHAMBER SHAPE ON CUTTING PERFORMANCE IN ABRASIVE WATER JET173707710.21608/amme.2012.37077ENH-RLeeGraduate student, Intelligent Control and Automation Division, Dept. Mechanical
Eng., Pusan National University, Busan, South Korea.Y-KKwakGraduate student, Dept. of Mechanical and Intelligence System Engineering, Pusan
National University, Busan, South Korea.H-YKimAssociate professor, Research Institute of Mechanical Technology, Pusan National
University, Busan, South Korea.J-HAhnProfessor, Dept. Mechanical Engineering, Pusan National University and
ERC/NSDM, Busan, South Korea.Journal Article20190625ABSTRACT<br />It is well known that abrasive water jet (AWJ) was developed as a kind of highdensity<br />energy processing technologies. AWJ is used to obtain cutting quality of<br />various materials such as metal, ceramics, glass and composite materials within a<br />short manufacturing time because of the characteristics of heatless and noncontact<br />processing. However, surface roughness and dimension error like round, burr, taper<br />depend on the cutting conditions such as pump pressure, cutting speed, orifice<br />diameter, standoff distance, abrasive flow rate and work piece.<br />In this paper, the effect of the shape of mixing chamber on surface quality is studied.<br />Parabolic mixing chamber is proposed and performance is compared to that of<br />cylindrical mixing chamber by experiment. The surface roughness was improving<br />0.15 to 2.29 and the taper angle was improving 0.0716° to 0.143° by parabolic<br />mixing chamber.https://amme.journals.ekb.eg/article_37077_2699aa9a7ad37dafc6097836f8ba520b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ON THE SENSITIVITY OF CUTTING CONDITIONS ON CUTTING FORCES AND VIBRATION SIGNALS WHEN TURNING WITH TOOL INSERTS WITH INTEGRATED CHIP-BREAKER GEOMETRY1263707910.21608/amme.2012.37079ENE.DimlaLecturer, School of Engineering, University of Portsmouth, Portsmouth, U. K.Journal Article20190625ABSTRACT<br />This paper is concerned with investigating the effects of cutting conditions on sensor<br />signals, employing tool inserts with chip breaker geometry and a harder workpiece<br />material. Medium double coated carbide grade tool inserts with integral groove chipbreaker<br />was used to cut EN24T alloy steel. The focus was to investigate and<br />corroborate the effects of cutting conditions (cutting speed, feed rate and dept of cut)<br />on the cutting forces and vibrations signals during orthogonal turning using coated<br />chip-breaker geometry indexable tool inserts. Cutting forces and vibration signals<br />were recorded on-line at the various cutting conditions, and these analysed in time<br />and frequency modes for features that were sensitive to the variation in the cutting<br />conditions. Peculiar characteristics in the signal spectrum were identified and these<br />were easily associated with changes in the cutting conditions as well as chip<br />lamination.https://amme.journals.ekb.eg/article_37079_76ec836e1ca7d545bc8c6326a949049b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501SCORING MODEL FOR FIBER LASER CUTTING OF MILD STEEL SHEETS1143708010.21608/amme.2012.37080ENM.SobihEgyptian Armed Forces.W. M.HussienEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />Laser cutting is one of the most important non-conventional manufacturing<br />processes due to its unique properties and advantages. It is a multi-parameter<br />technology. This fact has resulted in some gaps in available information, and a few<br />of contradictory reports about the exact effect of each process parameter on the<br />surfaces produced, and makes quick parameters selection for obtaining a desired<br />cut quality problematic, especially for new laser types. Fiber lasers have only very<br />recently come into prominence, and the literature is still very sparsely populated with<br />data on their performance. This paper outlines the use of a scoring model of<br />Projection to Latent Structure (PLS) technique and applies it to study the effects of<br />fiber laser cutting process parameters and their interactions on the quality achieved<br />during cutting mild steel sheets. The effects of the interaction of the main process<br />parameters on the quality output variables such as top kerf width, surface roughness<br />and the striation depth are studied. Scoring models are proposed to relate the quality<br />and the laser cutting parameters.https://amme.journals.ekb.eg/article_37080_c629a93299319dfd60c50aa2fa7bc422.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501REQUIREMENTS OF ISO/TS 16949:2009 FOR AUTOMOTIVERELATED PRODUCTS AND CASE STUDY FOR ITS APPLICATION113708110.21608/amme.2012.37081ENM. M.El-DessoukyProf. Dr., Chem. Engineering Dept., MTC.Journal Article20190625ABSTRACT<br />Organizations of automotive-related products are concerned with achieving<br />improvement in their performance by controlling their activities, products and<br />services. The International Standard ISO/TS 16949:2009 provides well the<br />requirements of management system elements to enable an organization to develop<br />and implement its policy, objectives and processes considering legal requirements to<br />provide high quality and safe products. The effectiveness and success of the system<br />depends on commitment of all levels and functions of the organization, especially top<br />management. The aim of this International Standard is to support establishing,<br />implementing and improving management system and to assure interested parties<br />that an appropriate and safe spare parts for automotive industry will be produced<br />according the required specifications.<br />After offering the requirements of the main management system elements, case<br />study for automotive-related industry will be discussed how to establish, implement<br />and improve effective system.https://amme.journals.ekb.eg/article_37081_34415d9503efa6dc6d0fe358cc13e63c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501APPLICATION OF FMEA-FTA IN RELIABILITY-CENTERED MAINTENANCE PLANNING1113708310.21608/amme.2012.37083ENI. H.Abdel-AzizAssistant professor, Faculty of Engineering, Fayoum University, Fayoum, Egypt.M.HelalAssistant professor, Benha Faculty of Engineering, Benha University, Egypt.Journal Article20190625ABSTRACT<br />The failure mode and effects analysis (FMEA) has been used in identifying and<br />reducing risks of failures in systems, equipment, and components following a<br />bottom-up approach. The technique has been criticized for being unintuitive and<br />cumbersome. The fault tree analysis (FTA) follows a top-down approach to<br />identifying the root causes of failures. We apply FMEA to a large-sized axial plunger<br />pump in an Egyptian fertilizers production plant. We extend the analysis to using the<br />FMEA outcomes to launch the FTA to support the evaluation of the potential failures<br />modes. We argue that the two techniques; FMEA and FTA, can complement each<br />other in support of equipment reliability and availability studies. Together, they can<br />offer as the basis of a reliability-centered maintenance planning, a systematic means<br />of cataloguing information about potential failures, and accumulation of better<br />knowledge of potential problems and improvement actions besides possible<br />maintenance cost reductions.https://amme.journals.ekb.eg/article_37083_64c536832dbba53bcfd9cc2526f34a7c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501QUALITY IMPROVEMENT OF THERMOFORMING PROCESS USING SIX SIGMA METHODOLOGY1143708410.21608/amme.2012.37084ENM. S.NagyResearcher for M. Sc. Degree, Dept. of Prod. Eng. and Mech. Design, Faculty of
Engineering, Menoufiya University, Egypt.M. A.Sharaf El-DeenAssociate Professor, Dept. of Prod. Eng. and Mech. Design, Faculty of Engineering,
Menoufiya University, Egypt.A. R.El-DesoukyProfessor, Dept. of Prod. Eng. and Mech. Design, Faculty of Engineering, Menoufiya
University, Egypt.Journal Article20190625ABSTRACT<br />The importance of quality has been recognized in the business environment in order<br />to obtain or produce higher quality products. In a manufacturing environment,<br />process tends to produce defects due to various reasons which can be improved by<br />identifying and eliminating them using Six Sigma methodology. In this paper, DMAIC<br />(Define, Measure, Analyze, Improve, and Control) approach has been used to<br />reduce the number of rejected thermoformed inner liners of home refrigerator. In<br />define phase, problem was defined by determining the main category of defects. In<br />measure phase, data were collected to determine the current performance and the<br />process capability. In analyzing phase, root causes of main defects were identified.<br />In improvement phase, corrective actions and solutions were determined and finally<br />in control phase, various procedures were implemented for tracking the process and<br />putting it under control. The results showed that process quality was improved<br />through reduction in defects from about 123000 ppm to about 55000 ppm.https://amme.journals.ekb.eg/article_37084_687498990bfc4a306f6dde05d7186681.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501TRACKING CONTROL OF AN UNDERACTUATED AUTONOMOUS SHIP1193708610.21608/amme.2012.37086ENS.SamaaliAssociate Professor, Laboratory of Mathematical Engineering (LIM), Tunisia
Polytechnic School, BP 743, 2078 La Marsa, Tunisia.A.AbichouProfessor, Laboratory of Mathematical Engineering (LIM), Tunisia Polytechnic
School, BP 743, 2078 La Marsa, Tunisia.Journal Article20190625ABSTRACT<br />In this paper, we will construct a control that forces position and orientation of the<br />underactuated autonomous ship moves according to a reference feasible trajectory.<br />To achieve this objective, we use as a design tool of puts the Backtepping<br />methodology and Lyapunov function. Experimental results are given to show the<br />tracking performance. We will illustrate trajectories with time varying velocity<br />(sinusoidal path). Then, we will test the tracking robustness in presence of drag<br />forces disturbances.https://amme.journals.ekb.eg/article_37086_d1d4553597825eee27ee416d9fda1091.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EFFECTS OF PROPELLER BLADE TWIST ON RECONNAISSANCE QUAD-ROTOR UAV1153708710.21608/amme.2012.37087ENA. S.ImamPGR Student, Department of Mechanical and Systems Engineering, Newcastle University, U.K.R.BickerSenior Lecturer, Department of Mechanical and Systems Engineering, Newcastle University, U. K.Journal Article20190625ABSTRACT<br />Rotors play a pivotal role in the overall performance of a rotary-wing aircraft. Forces<br />and moments required for flight are achieved through effective, compact and high-lift<br />rotor design. Important rotor parameters are thrust, power and torque, which are<br />functions of blade twist and rotor radius. A robust and efficient rotary-wing UAV flight<br />control system must provide the vehicle with the ability to perform safe flight<br />manoeuvres. This comprise normal flight conditions and proportionate regulation of<br />thrust in response to the variation in power demand, which comes to play due to<br />changes in aerodynamics conditions within the vehicle operating environment. This<br />paper presents an in-depth analysis on the effect of variations of propeller blade twist<br />and diameter with the view to designing an autonomous flight control system for a<br />micro rotary-wing UAV. Virtual Blade Model (VBM) was used for the analysis and the<br />result validated using a quad-rotor vehicle. The study comes up with an efficient<br />propeller choice suitable for autonomous reconnaissance quad-rotor UAV.https://amme.journals.ekb.eg/article_37087_5067b2114ce026fc6be00b168dd6504b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501VISION BASED SAFE ROAD TRACKING SYSTEM FOR AUTONOMOUS GROUND VEHICLE1143708810.21608/amme.2012.37088ENT. S.Abd El-ZaherEgyptian Armed Forces.A. M.BayoumyEgyptian Armed Forces.A. M.SharafEgyptian Armed Forces.Y. H.Hossam El-DinProfessor, Mech. & Mechatronics Engineering Dept., Higher Technological
Institute, 10th of Ramadan, Egypt.Journal Article20190625ABSTRACT<br />The past decade has witnessed a rapid evolution of the sensors technology as well<br />as the embedded systems which in turn stimulates the development of a futuristic<br />field such as the autonomous mobile systems. However, the development of an<br />autonomous ground vehicle that is able to sense and avoid obstacles on its way<br />represents a major challenge up till now. Various autonomous ground vehicles have<br />been recently introduced which rely on wide diversity of detection systems such as;<br />laser systems, acoustic systems and machine vision systems.<br />This paper proposes an advanced algorithm for an autonomous ground vehicle<br />based on lane detection and tracking in addition to obstacle avoidance technique.<br />Through this algorithm, the suitable car heading angle is calculated in order to follow<br />the lane or avoid predefine obstacles. The lane and / or obstacles are being<br />recognized based on vision system in which a real time data are collected by a<br />single camera and analyzed using the color separation technique. An in-house<br />numerical model is developed to estimate both the relative distance and direction of<br />the obstacle. Consequently, further actions are considered to enable the vehicle to<br />drive accurately down a predefined path and at a defined speed. The results reveal<br />both the fidelity and the robustness of the introduced algorithm.https://amme.journals.ekb.eg/article_37088_b6ec3d22994c7636830b167dd3fa155a.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501REMOTE OPERATED TRACKED VEHICLE FUEL PEDAL ACTUATOR PERFORMANCE1173709010.21608/amme.2012.37090ENM.AtefEgyptian Armed Forces.M. A.ElhaddadAssociate Professor, Dept. of Automotive Engineering, Higher Institute of
Technology, 10th of Ramadan, Egypt.R. H.KhodaryEgyptian Armed Forces.A. E.EliewaEgyptian Armed Forces.Journal Article20190625ABSTRACT<br />In recent years, there has been a great interest worldwide in the development of<br />Autonomous Ground Vehicle System (AGVS) technologies due to their potential in<br />civil and military applications.<br />This paper presents an effective algorithm to control the speed of a tracked vehicle.<br />This is part of a larger control system that converts a manual driving vehicle into a<br />remotely one. To achieve this goal an electronically controlled module is proposed,<br />realized and implemented on the fuel pedal. The necessary sensors and actuators<br />have been added to the conventional vehicle. These sensors and actuators have<br />been selected according to the design diagram of vehicle control system and system<br />calculations where the LabVIEW software is used as base environment for<br />implementation of the system controller as well as the development of the control<br />algorithm.<br />For investigation of the implemented fuel pedal control system, a dynamic model is<br />developed and the simulation results were found to agree to a great extent with the<br />real test results.https://amme.journals.ekb.eg/article_37090_10943df38d185147dd058955d388fc59.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DYNAMIC MODELING AND CONTROL OF QUADROTOR VEHICLE1103709210.21608/amme.2012.37092ENA. Y.ElrubyDept. of Mech. Mechatronics, AAST, Cairo, Egypt.M. M.El-khatibEgyptian Armed Forces.N. H.El-AmaryDept. of Elec. Power, AAST, Cairo, Egypt.A. I.HashadDept. of Comp. Eng., AAST, Cairo, Egypt.Journal Article20190625ABSTRACT<br />The control of Unmanned Aerial Vehicles (UAVs) is a very challenging field of<br />research especially for Vertical Take-Off and Landing (VTOL) vehicles or aircrafts for<br />their numerous advantages over the traditional airplanes and due to the rapid<br />advances that were made in this field with the development of light weight Micro-<br />Electromechanical System (MEMS) sensors; it has become possible to build an<br />autonomous model for a light weight quadrotor and to develop various controls for it.<br />This paper focuses on the mathematical model of a quadrotor vehicle. A CAD model<br />has been built for estimating mass and inertial properties of the physical model.<br />Finally a PID controller for the proposed model is introduced then a Simulink model<br />has been implemented for estimating the response of flight dynamics.https://amme.journals.ekb.eg/article_37092_2d13d25710a49ac9477d4aa9793d8816.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EFFECT OF THE LINK-LENGTH RATIO ON PAINLEVÉ PARADOX FOR A SLIDING TWO-LINK ROBOT1123725110.21608/amme.2012.37251ENH. A.ElkaranshawyAssociate Professor, Dept. of Eng. Math and Phys. Alexandria University, Egypt.M.GhazyAssistant Professor, Dept. of Eng. Math and Phys. Alexandria University, Egypt.Journal Article20190626ABSTRACT<br />For a rigid body sliding on a rough surface, a range of uncertainty or non-uniqueness<br />of solution could be found, which is termed: Painlevé paradox. Painlevé paradox is<br />the reason of a wide range of bouncing motion, observed during sliding of robotic<br />manipulators on rough surfaces [1,2]. In this research work, the existence of the<br />paradox zone during the sliding motion of a two-link manipulator is investigated.<br />Parametric study is performed to investigate the effect of friction, link-length ratio,<br />and link-mass ratio on the paradox zone.https://amme.journals.ekb.eg/article_37251_a93f3affd58c9e40aae70d7b0a5ee6f9.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501IMPLEMENTATION OF DOWN-THE-HOLE DRILLING RIG TRAINING AID1133725310.21608/amme.2012.37253ENM. H.MabroukPh.D, Egyptian Armed Forces.R.SamyEgyptian Armed Forces.Journal Article20190626ABSTRACT<br />Mechanical equipment training aids has been used widely in the last few years due<br />to the advancements in technology and also the fact that they allow drivers of all<br />levels to acquire skills and experience to be prepared for real in-field emergencies<br />with lower cost. This paper presents the implementation of a down-the-hole drilling<br />rig training aid which is a one-to-one scale training aid of the “Titon 100R” drilling rig<br />[1]. A comparison between the technical specifications of both the original equipment<br />and the training aid is mentioned. Regarding the low cost training programs, the<br />training aid has been tested and technically approved to be used as a training aid for<br />the drivers of drilling rig especially those who do not have enough in-field work<br />experience.https://amme.journals.ekb.eg/article_37253_3523cff0fa3aac9a9be4edd0c1ddf8dc.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ELECTRO-HYDRAULIC CONTROL SYSTEM FOR PLOUGH MACHINE OPERATION1103725410.21608/amme.2012.37254ENM.RafatEgyptian Armed Forces.
Corresponding author.H. A.AbdelkaderEgyptian Armed Forces.M. E.Abo-ElnorEgyptian Armed Forces.M. H.SaidProfessor, College of Engineering, Helwan University, EL-Mataria, Cairo, Egypt.Journal Article20190626ABSTRACT<br />An electro-hydraulic control system is designed to control the demining depth of a<br />mine plough machine equipped with plough blade of “V” type. A Linear Variable<br />Differential Transformer (LVDT) is used to account for blade position and an<br />ultrasonic distance sensor is used to provide precise, non-contact, level distance<br />measurements through dusty environment. The proposed control system is<br />implemented to the operating hydraulic system of a scaled model of a plough<br />mechanism. The operating hydraulic actuators used to control the plough<br />mechanism are controlled through a microcontroller and system relays to maintain<br />plough blade depth constant. Results show that significant match between operating<br />surface topology and clearing depth is validated by the proposed control system.https://amme.journals.ekb.eg/article_37254_a88daca82719006a7ee4c9f321d6679f.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501INTEGRATION OF CAR SECURITY LEVELS USING TRANSPONDER KEY: DOUBLE IDENTIFICATION CAR CODE193725510.21608/amme.2012.37255ENM. N.TawfeekEgyptian Armed Forces.S.ShedidEgyptian Armed Forces.I.El-SherifEgyptian Armed Forces.Y.HendawyProfessor, High Institute of Technology, 10th of Ramadan city, Egypt.Journal Article20190626ABSTRACT<br />One of the main problems in the field of transportation is the diversity of the concepts<br />of vehicle security that has been lately elaborated under continuous threat of<br />technology spreading in a very chaotic manner, issue that opposes many obstacles<br />when evaluating the security measure of such technique on the ground, especially<br />when dealing with very important person (VIP) security, and its constrains. This<br />paper aims to develop a scientific approach to integrate three levels of car security<br />namely life saving, car theft prevention and user access security with respect to<br />current technologies. Novel double identification code applications are introduced.<br />The introduced applications use the traditional radio frequency car key considering<br />Actual threats and limited budget using novel methodologies. They enhance the<br />fixed code key security to achieve the security level of rolling code key. Experimental<br />work has been carried out using the two standard car communication frequencies<br />namely 315MHz and 433.9MHz simultaneously to transmit two different fixed car<br />codes with a spatial frequency separation.https://amme.journals.ekb.eg/article_37255_e1a9ba8a8f511fdd5740ee732598fb4d.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501COMPOUND BENDING OF INHOMOGENEOUS THIN PLATES IN NONUNIFORM TEMPERATURE FIELD183725610.21608/amme.2012.37256ENA. N.TyurehodzhayevProfessor, Department of Applied Mechanics and Principles of Machinery
Engineering, the Kazakh National Technical University named after K.I. Satpayev,
Almaty, Kazakhstan.G. K.KalzhanovaHead of Educational-Methodical Department, Zhetysu State University named after I.
Zhansugurov, Taldykorgan, Kazakhstan.Journal Article20190626ABSTRACT<br />The particular interest in the mechanics of deformable solid are the problems<br />associated with the bends of flexible plates and various flexible shells working in<br />non-uniform temperature field. Such problems are commonly encountered in applied<br />problems of the construction, oil-field, mechanical engineering, water and air<br />transport. During mathematical review of such kind of problems you have to deal<br />with systems of linear differential equations with variable coefficients and nonlinear<br />differential equations, and making analytical solution of which represents<br />considerable mathematical difficulties. Analytical solutions of such problems can be<br />made by the method of partial discretization, the method that has been derived by<br />one of the authors of this article based on the theory of generalized functions.<br />The paper considers the problem of thermoelasticity of inhomogeneous circular<br />flexible plate in the axially symmetric temperature field by taking into account the<br />influence of bending tension and change of elastic properties of plate material along<br />its thickness. The problem of compound bending of inhomogeneous circular plate<br />exposed to the action of lateral load, under temperature changes in thickness of the<br />plate with the influence of bending tension come to the investigation of decoupled<br />system of differential equations, obtaining of analytical solution of which using the<br />existing mathematical apparatus was not possible.https://amme.journals.ekb.eg/article_37256_cf5d5d0ba179ec9b71c287fcb040176e.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501ANALYTICAL SOLUTION OF SOME PROBLEMS OF APPLIED THEORY OF GYROSCOPES1153725710.21608/amme.2012.37257ENA. N.TyurehodzhayevProfessor, Department of Applied Mechanics and Machinery Engineering Principles,
the Kazakh National Technical University named after K. I. Satpayev, Almaty,
Kazakhstan.Journal Article20190626ABSTRACT<br />Motion of solid body with a fixed point is described by a system of nonlinear<br />differential equations of motion of L. Euler. Gyroscopic instruments represent an<br />axisymmetric solid body with a fixed point. The first partial solutions of the problem<br />were obtained in works [1-4]. The subsequent development of Mechanics and<br />Mathematics demonstrated that a nonlinear system of motion of L. Euler equations<br />may describe a wide class of motions of celestial bodies, stability of motion of<br />spacecrafts, Earth satellites, ships, aircrafts, monorail trains, etc.<br />The great interest to the problems with a fixed point is due to the gyroscopic effects,<br />which became widespread in the modern technology, navigation and in many other<br />areas.<br />More than 250 years have passed since the origination of nonlinear equations of<br />motion of L. Euler, however, the interest in obtaining the solutions of these equations<br />do not weaken. The world holds a huge amount of publications, for example, [5-14].<br />The analytical solutions of some problems characterizing the functioning of<br />gyroscopes have been obtained based on the method of partial discretization of<br />nonlinear differential equations, formed by the author of the report.<br />This paper demonstrates an analytical solution of the nonlinear problem on the<br />motion of an axisymmetric solid body with a fixed point at a high velocity rate of selfrotation<br />n. New analytical results have been obtained based on the method of partial<br />discretization of nonlinear differential equations.https://amme.journals.ekb.eg/article_37257_3877672d5edd4ce3cccd516ce97ebe52.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DELAMINATION DETECTION OF COMPOSITE LAMINATES USING NATURAL FREQUENCY VIBRATION METHOD1113725810.21608/amme.2012.37258ENR.SultanLibyan air force, Libya.S.GuirguisEgyptian Armed Forces.M.YounesEgyptian Armed Forces.E.El-Soaly10th of Ramadan Higher Institute of Tech., Egypt.Journal Article20190626ABSTRACT<br />Composite materials are widely used in aeronautical, marine and automotive<br />industries, because of their excellent mechanical properties, low density and ease of<br />manufacture .However, composite laminates are susceptible to delaminations, which<br />may not be visible externally, but can substantially affect the performance of the<br />structure. Vibration testing, in particular delamination detection, in the composite<br />structures is an active research area. D'Alembert principle is used to determine the<br />theoretical natural frequency of laminated orthotropic composite plate. The present<br />free vibration experimental study of simply supported square laminated plates is<br />based on the comparison between natural frequencies of healthy and delaminated<br />composite plates. The test square plates made of hand lay up 8 layers E-glass<br />woven fibre and epoxy resin are used here. The present paper discusses the<br />observations made on the measured natural frequencies of vibration testing from<br />both the healthy and the delaminated square simply supported plates. The possibility<br />of the delamination detection by vibration testing is also introduced. The effects of<br />delamination area on the natural frequencies of the plate are presented. The<br />delamination in composite laminates has considerable effect on the natural<br />frequencies of the plate.https://amme.journals.ekb.eg/article_37258_1b54c83f1c63ed34bb6d7aea6ba8c24e.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501NUMERICAL INVESTIGATION OF A HIGH-SPEED PROJECTILE PENETRATION INTO BI-LAYERED LIGHTWEIGHT TARGETS1173725910.21608/amme.2012.37259ENM. A.ShakerEgyptian Armed Forces.H. A.Abou-ElelaEgyptian Armed Forces.A. M.RiadEgyptian Armed Forces.A. I.FayedEgyptian Armed Forces.Journal Article20190626ABSTRACT<br />In this paper, Autodyn-3D hydrocode is used to simulate the penetration process of<br />small caliber steel projectiles into bi-layered targets with finite thicknesses consisting<br />of silicon carbide ceramic facing tile backed by kevlar/epoxy composite plate. The<br />numerical results of the hydrocode program are used to assess the predictions of the<br />proposed analytical model [7]. So, the input data of the projectile and target materials<br />to the hydrocode are coincide with that input to the analytical model [7]. These data<br />include geometries of projectile and target as well as mechanical and physical<br />properties of their materials such as density, modulus of elasticity, yield strength and<br />Poisson's ratio. The main procedures used to simulate the penetration process are<br />introduced.<br />The obtained numerical results are compared with the predictions of the analytical<br />model [7] due to the impact of a Fragment Simulated Projectile (FSP) having the<br />same penetration capability as that of 7.62 mm NATO projectile [8] into<br />ceramic/composite targets with different velocities; good agreement is generally<br />obtained. In addition, Samples of the time histories results predicted by the<br />hydrocode are presented with analyses and discussions. Finally, It can conclud that<br />the Autodyn-3D hydrocode is considered as a quick tool for designing and optimizing<br />the bi-element lightweight armour capable of defeating a projectile of certain threat.https://amme.journals.ekb.eg/article_37259_e02f11d9d117cd99b48af9581024f0f5.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501MODELING PENETRATION OF BI-ELEMENT METALLIC TARGETS BY HIGH-SPEED PROJECTILES1183726010.21608/amme.2012.37260ENH. A.Abou-ElelaEgyptian Armed Forces.A. M.RiadEgyptian Armed Forces.A. I.FayedEgyptian Armed Forces.M. A.ShakerEgyptian Armed Forces.Journal Article20190626ABSTRACT<br />In this paper, an analytical model is proposed to describe the penetration<br />of a high-speed projectile into a metallic bi-element target, consisting of a finite<br />thickness metallic layer facing a semi-infinite RHA armor. The proposed model<br />identifies two main phases for target penetration; these are: (i) penetration of the<br />front metallic layer and (ii) penetration of backing semi-finite metallic armor. During<br />the target penetration phases, three modes of the projectile front may occur; these<br />are erosion, mushrooming and rigid modes [1, 6]. Main assumptions and governing<br />equations of each target penetration phase for each mode of projectile front are<br />presented. These equations are arranged and compiled into a computer program.<br />The input data to the program are easily determined.<br />The measured penetration depths of depleted uranium (DU) projectiles into semiinfinite<br />RHA armor at different impact velocities of Ref. [4, 5] are compared with the<br />corresponding model predictions to determine the RHA flow stress. In addition, the<br />model predictions are compared with the ballistic measurements of Ref. [4] to<br />determine the flow stress of front metallic layer materials of the bi-element targets.<br />The present model is also used to predict the ballistic efficiencies of the front titanium<br />plates with different thicknesses when each of them is backed by a semi-infinite RHA<br />armor. Moreover, predicted samples for the influence of the projectile impact velocity<br />on the ballistic efficiency are presented and discussed.https://amme.journals.ekb.eg/article_37260_ffdc5222427e0c3729763ac40599f351.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501LAUNCHING RECOIL DUMPING IMPROVEMENT FOR MLRS BY USING A RING WIRE ROPE ABSORBER1143726110.21608/amme.2012.37261ENA.KariTeaching Assistant, Military academy, University of Defense, Belgrade, Serbia.D.JerkovicTeaching Assistant, Military academy, University of Defense, Belgrade, Serbia.M.MilinovicProfessor, Faculty of mechanical eng., University of Belgrade, Belgrade, Serbia.S.IlicAssistant professor, Military academy, University of Defense, Belgrade, Serbia.Journal Article20190626ABSTRACT<br />Paper considers model of shock loads dumping during launching by using the wire<br />rope absorber. Loadings are generated and initiated by shock forces, appeared as<br />reaction of nozzle gases at muzzle velocities conditions on the Multiple Launch<br />Rocket System (MLRS). Dumping of impulse loadings could be realized by design of<br />wire rope absorber tested and represented in this paper. Absorber is typical<br />nonlinear, no periodical dumper. Experimental model of absorber is tested by<br />equipment able to simulate approximations of real launching forces. Different short<br />time dynamical loadings are approximated with linear and harmonic functions as<br />initial shock and unsteady forces. Relations between initiation shock forces and<br />response forces at the exit of wire rope absorber are compared experimentally by<br />results tested in real time. Results presented in the paper shows force-time<br />performances and possibilities for application of new ring designed of wire rope<br />absorber used at MLRS combat platforms.https://amme.journals.ekb.eg/article_37261_e45b90c42b351203b3e03b65693522f0.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501A COMPUTATIONAL CODE FOR THE DESIGN OF THREE-DIMENSIONAL COMPOSITE STRUCTURES1203726610.21608/amme.2012.37266ENA.RamsaroopDoctoral Student, Department of Mechanical Engineering, Durban University of
Technology, Durban, South Africa.K.KannyProfessor, Department of Mechanical Engineering, Durban University of
Technology, Durban, South Africa, Tel: +2731 373 2230; Fax: +2731 373 2139.Journal Article20190626ABSTRACT<br />Conventional design techniques for fibre reinforced composite laminates prove to be<br />quite laborious. These methods involve numerous matrix calculations which make<br />manual computations very tedious. To overcome this, a designer uses a finite set of<br />fibre angles in a design; however the chosen angles may not be the optimum ones<br />for the structure. Therefore MATLAB codes were developed to assist in the design<br />process. These codes remove the guesswork experienced in the conventional<br />design methods and perform all the necessary computations quickly and efficiently<br />as well as being able to design three-dimensional structures. The developed codes<br />were verified via finite element analyses. The development and operation of these<br />codes are discussed further.https://amme.journals.ekb.eg/article_37266_61219e95704d9aacc327d9e267682b45.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501AN EXPERIMENTAL AND NUMERICAL STUDY OF SUBMERSIBLE PRESSURE HULL1123726810.21608/amme.2012.37268ENM.MoustafaEgyptian Armed Forces.E. E.El-Soaly10th of Ramadan High Institute of Technology.A.BadawyEgyptian Armed Forces.Journal Article20190626ABSTRACT<br />The analysis of pressure hull is of great importance among structural engineering<br />due to the complexity involved in the collapse mechanism of stiffened shell<br />structures. Due to this complexity, only a limited amount of test data was available to<br />evaluate the effect of the external pressure on the stability of stiffened shell structure.<br />The proposed work considers theoretical study and experimental test data of the<br />pressure hull. Uniformly ring stiffened cylinder, dome and conical elements of a<br />pressure hull are considered. For the same experimentally considered model, a<br />numerical study using Finite Element Method (by ABACUS program) is also<br />presented. The obtained experimental and numerical results are compared.https://amme.journals.ekb.eg/article_37268_923188bba8886ece7bef63a84f5fe3c0.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501TORSIONAL ACTUATION OF ORTHOTROPIC BEAM USING INCLINED PIEZOELECTRIC PATCHES1253726910.21608/amme.2012.37269ENM. A.ElshafeiEgyptian Armed Forces.A. A.OmerEgyptian Armed Forces.A. M.FaridEgyptian Armed Forces.Journal Article20190626ABSTRACT<br />The objective of this research is to develop a finite element model for the analysis of<br />the static response of a composite compressor blade subjected to extension,<br />transverse, and torsion loads in addition to the torsion actuation due to the<br />piezoelectric patches. The equation of motion is derived based on classical beam<br />theory with warping effect is taken into consideration, using the principle of the<br />virtual displacement of the structure system. A one dimensional linear isoperimetric<br />element with Lagrange and hermit cubic shape functions is used to model the axial<br />and transverse deformation. A two end nodes and an intermediate one as well are<br />implemented for modeling the torsion deformation. The bending, torsion and axial<br />coupling are introduced in the stiffness and mass matrices. The electric potential is<br />treated as a generalized electric coordinates like the generalized displacement<br />coordinates. A MATLAB interactive code is developed to solve a blade with<br />mechanical and electrical loads. The obtained results are found reasonable.https://amme.journals.ekb.eg/article_37269_29d0a4b2690c6a7b94e4d7190e31ecce.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501MODELING OF SMART PIEZOELECTRIC COMPOSITE BEAMS USING A SIMPLE HIGHER ORDER SHEAR DEFORMATION THEORY1293727010.21608/amme.2012.37270ENM. A.ElshafeiEgyptian Armed Forces.F.AlraiessLibyan Armed Forces.Journal Article20190626ABSTRACT<br />The ability to change and control the shape of the structure has been a challenging<br />problem. In the current work the shape control of isotropic as well as an orthotropic<br />fiber-reinforced composite beam with embedded piezoelectric actuators is<br />investigated. A finite element formulation is developed for modeling laminated<br />composite beams with a distributed piezoelectric actuators subjected to both<br />mechanical and electrical loads. A simple higher order shear deformation theory with<br />virtual displacement method is used to formulate the equations of motion. The model<br />is valid for both segmented and continuous piezoelectric elements which can be<br />either surface bonded or embedded in the laminated beams. A two-node with four<br />mechanical degrees of freedom is used in the finite element formulation. The<br />electric potential is treated as a generalized electric coordinates like the generalized<br />displacement coordinates at the mid-plane of the actuator. A MATLAB code is<br />developed to compute the static deformations and the natural frequency of the<br />structure system. The obtained results from the proposed model are compared to<br />the available analytical and the finite element results of other researchers.https://amme.journals.ekb.eg/article_37270_1b2d3c45edd6ca7398ffd5312845ed7c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501COMPUTATIONAL ANALYSIS OF A TRUSS TYPE FUSELAGE1113727110.21608/amme.2012.37271ENI. A.YousifM. Sc. Student, Karary University.M. A. M.ZeinB. Sc. Khartoum univ., Mechanical Eng. Dept.M. E.ElsayedAssist. Prof., Karary Univ., Aeronautical Dept.Journal Article20190626ABSTRACT<br />The strength of a welded truss type fuselage of a light aircraft is considered in this<br />paper. The fuselage geometry has been extracted experimentally from a built one<br />and modeled using a CAD package. Aerodynamic loads have been determined<br />using standard loading calculations accepted in the industry.<br />Static structural analysis has been conducted using finite element method FEM for<br />the rear section of fuselage with great consideration to welding complexity. The<br />result has been found acceptable but further experimental validation is needed.<br />Presently experimental and dynamic analysis is being conducted and the results will<br />be published later.https://amme.journals.ekb.eg/article_37271_c611e3ad0a7ae31a912d708d29ab39b0.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501PROBABILISTIC ANALYSIS OF GLASS EPOXY COMPOSITE BEAMS FOR DAMAGE INITIATION DUE TO HIGH VELOCITY IMPACT1123727410.21608/amme.2012.37274ENS. D.PatelResearch Scholar, Department of Applied Mechanics, Indian Institute of Technology Delhi, New
Delhi, India.S.AhmadProfessor, Department of Applied Mechanics, Indian Institute of Technology Delhi, New Delhi,
India.P.MahajanProfessor, Department of Applied Mechanics, Indian Institute of Technology Delhi, New Delhi,
India.Journal Article20190626ABSTRACT<br />A numerical 3D dynamic finite element approach was adopted to study damage in<br />composite beam subjected to high velocity impact. The contact force between the<br />impactor and the target depends on the impactor mass, velocity and the elastic<br />properties and other characteristic of composite beams. Fiber reinforced composite<br />beams are susceptible to damage due to impact by foreign objects and in plane<br />loading. In order to assess the safe load carrying capacity and the probability of<br />failure under impact, dynamic analysis of composite beam subjected to high velocity<br />impact is carried out. Finite element method is used to study the impact. During high<br />velocity impact the out-of-plane damage modes such as matrix cracking and fiber<br />failure are modeled using a failure criterion. The limit state functions for the<br />composite beam under impact are derived from Chang-Chang [9] failure model.<br />The uncertainties associated with the properties and their inherent scatter in the<br />geometric and material properties and input load are modeled in a probabilistic<br />fashion. Random parameters represent various characteristics appearing in the limit<br />state function. The probabilistic analysis and reliability prediction of the system is<br />carried out using the first order reliability method (FORM) and validity of method is<br />established using Monte Carlo simulation (MCS) procedure .The results show that<br />for the given system and respective scatter, first order reliability method yields<br />satisfactory level of accuracy. Sensitivity analysis of probability of failure with respect<br />to random parameters considered is an important study for design optimization. The<br />safety level quantification is achieved in terms of reliability level targeted. The mean<br />and standard deviations of random variables show an appreciable influence on the<br />probabilistic failure. Systematic changes in the input parameters are governed by<br />probabilistic sensitivity tools to achieve target reliability.https://amme.journals.ekb.eg/article_37274_47ebeadfe6253734f4dce4f80d5427fe.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501DYNAMIC BEHAVIOUR OF PAPER HONEYCOMB SANDWICH PANELS1113727510.21608/amme.2012.37275ENM. R.SaidProfessor, Faculty of Mech. Engineering, Universiti Teknikal Malaysia Melaka, Malaysia.M. K.IsmailPostgraduate Student, Faculty of Mech. Eng., Univ. Teknikal Malaysia Melaka, Malaysia.H. MdAkilAssociate Professor, School of Material and Mineral Resources Eng., Engineering
Campus, Universiti Sains Malaysia, Malaysia.Journal Article20190626ABSTRACT<br />Low velocity impact tests have been conducted on paper honeycomb sandwich<br />panels. Two panel thicknesses with span length of 100 mm are used; these are 35<br />mm and 41 mm, respectively. The dynamic behavior of each paper honeycomb<br />thickness is investigated using two types of indentors: hemispherical and bar. The<br />effect of indentor, and specimen length are studied. This includes the pattern of loaddisplacement<br />curve collapse load and energy absorbed. It concludes that the<br />dynamic collapse load on 41 mm thickness for hemispherical indentor increases by<br />5% compared with 35 mm. The impact energy absorbed for hemispherical indentor<br />increases by 36%.https://amme.journals.ekb.eg/article_37275_90716ff36f5c6871d930ee3565561026.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EFFECT OF CEMENTLESS-ORTHOPAEDIC STEM DESIGN ON FEMUR STRESS-SHIELDING193727710.21608/amme.2012.37277ENM. E.Abo-ElnorEgyptian Armed Forces.A. E.RadiProfessor of orthopaedics, Faculty of medicine, Ain-Shams Univ., Cairo, Egypt.M. S.Abo-ElkhairEgyptian Armed Forces.Journal Article20190626ABSTRACT<br />Total joint replacement has become a widely accepted treatment for many<br />destructive joint diseases including osteoarthritis and severe pathologic fractures. Of<br />total joint replacements, the hip is one of the most commonly replaced joints. Hip<br />stem design varies from long to short, thick to thin and matt to smooth. In this study<br />the effect of hip stem length on bone remodeling after surgery which is known as<br />stress-shielding effect was analyzed using a finite element technique. Results show<br />that stress-shielding introduced when using long-stem hip is much more than that of<br />using short-stem hip in a total hip replacement for cementless implant.https://amme.journals.ekb.eg/article_37277_72dae383ba34b200dac5a3614f41270a.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501EXPERIMENTAL AND NUMERICAL INVESTIGATION OF MECHANICAL BEHAVIOR OF NOTCHED COMPOSITE LAMINATES1133727810.21608/amme.2012.37278ENY.SamiEgyptian Armed forces.R. M.GadelrabProfessor, Dept. of Mechanical Engineering, Jazan University, Jazan, Saudi Arabia.M. M.Abdel-WahabEgyptian Armed forces.Y.EL-ShaerEgyptian Armed forces.Journal Article20190626ABSTRACT<br />Existence of notches greatly affects the mechanical behavior and damage in<br />composite laminates. In the present work, the effect of different parameters (hole<br />sizes, number of layers and stacking sequences) on damage growth and failure of<br />Glass/Polyester laminates containing central circular notches was investigated.<br />Tests were performed on [0o], [0,90o] and [±45o] notched specimens to investigate<br />the effect of different parameters. The damage progression in the composite<br />laminates during tests was monitored using optical non-destructive technique. The<br />notched laminate failure strength was compared with the predicted strength from the<br />semi-empirical point stress criterion (PSC). A finite element model was developed<br />using ANSYS Parametric Design Language (APDL) to predict the notched strength<br />and the damage growth during tensile loading taking into consideration the<br />application of Hashin failure criterion and material stiffness degradation on the failed<br />elements. The predicted notched strength and damage growth showed a good<br />agreement with the experimental results obtained.https://amme.journals.ekb.eg/article_37278_faa9edfbcf3fc414e3242d6c7547e1d6.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501HYDRAULIC COMPONENTS STANDARD MATHEMATICAL MODELS FOR APPLICATION ENGINEERS123728210.21608/amme.2012.37282ENM. K.BahrDirector of Professional Education, Milwaukee School of Engineering
Chairman of Fluid Power Mathematical Modeling Committee
1025 North Broadway, Milwaukee, WI, 53202-3109, USA.Journal Article20190626ABSTRACT<br />In order for the hydraulic component manufacturers to compete in the very tough<br />market, they must spend every effort to improve the characteristics of their<br />components. End users of hydraulic components have different interests depending<br />on the application e.g. cost, dynamics, efficiency, life time, operational conditions,<br />sensitivity to contaminations, noise, etc. Therefore, R&D sections at the hydraulic<br />component manufacturers are working day and night to investigate these issues<br />through developing detailed models. In some cases, probably several models are to<br />be developed for the same component where each model is dedicated to handle one<br />prospective, e.g. one model for dynamic response, second model for thermal<br />analysis, third model for stress analysis, etc.<br />Detailed models like these usually include dimensional parameters, operating<br />conditions and fluid properties. Most of these design parameters are known to the<br />component developer and considered critical and even classified info in the high tech<br />industry. Additionally, some of these design parameters may require to be carefully<br />assumed because it is not 100% known, e.g. viscous friction coefficients, leakage<br />coefficient, etc.<br />These expensive component-level models that are developed at the manufacturer’s<br />site may be dedicated for specific component/size/ brand and are not applicable for<br />other component/size/brand. Also it may be developed using software packages that<br />are not available for public.<br />System-level design is a totally different environment. First of all, system designers<br />have no access to all the critical design parameters of each component and it will be<br />tough for them to run after every unknown design parameter in every component.<br />Secondly, system designers are mostly interested only in the static and dynamic<br />characteristics of each component regardless the inside construction of the<br />component. System designer can mathematically model simple systems by a set of equations to be solved instantaneously. Part of the problem to follow such approach is that if the system layout is changed, the whole set of equation will be changed too. Therefore, system designer is mainly looking for more generic models that are flexible enough to be used repeatedly for similar components. In the past decade, a number of software packages were found in the market. These packages contains library out of which the user may grab premade models for hydraulic components to use in a system design. These software packages may give access to the user to see the mathematics behind the model, but not give access to change the way the models have been built. Recently a committee has been formed to formulate standard mathematical models
for various fluid power components. The main objective is to standardize the<br />mathematical models to facilitate the broader use, teaching and understanding of<br />fluid power systems in solving application-specific problems. This will raise the<br />technological level of the fluid power industry.<br />The purpose of this lecture is to update theaudience about the mission of the
committee, give a case study and recruit senior faculty to join the committee as a
members or observers.https://amme.journals.ekb.eg/article_37282_1fe2e1a4a9c4bb5a2973cfbe87dc9fab.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501VISION OF AMERICAN INSTITUTE OF AERONAUTICS AND ASTRONAUTICS IN DEVELOPING THE FUTURE AEROSPACE WORKFORCE113728610.21608/amme.2012.37286ENS.SalemJournal Article20190626AIAA Vision<br />AIAA's vision is to be the shaping, dynamic force in the aerspace profession- the<br />forum for innovation, technical excellence, and global leadership.<br />AIAA Mission<br />AIAA's mission to address the professional needs and interests of the past, current,<br />and future aerospace workforce and to advance the state of aerospece science,<br />enginering, technology, operations and policy to benefit AIAA golbal.<br />Publications and Papers<br />1. Books 2. e. Books 2. Standards
4. Journals 5. Meeting papers
https://amme.journals.ekb.eg/article_37286_9719c95534d00ab1101f50239aae4422.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501LEARNING MANAGEMENT SYSTEM (DEVELOPMENT AND OPERATION)113728710.21608/amme.2012.37287ENW.FaragJournal Article20190626ABSTRACT<br />This seminar will demonstrate the learning management system developed in<br />EGYPTAIR to run CBT programs for Aircrafts. Concepts, technical and operational<br />issues are discussed concerning the development and implementation of the<br />system. In addition, discusion on business issues to run and manage such systems<br />in a training environment will take place to make the best use of such systems.https://amme.journals.ekb.eg/article_37287_abd604e461224b7158b45d16985d87d6.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501RISK MANAGEMENT IN THE AVIATION GROUND LING (EGS COMPANY CASE STUDY)113729110.21608/amme.2012.37291ENT.FouadJournal Article20190626ABSTRACT<br />Management of preceived risks in the business is considered one of the international<br />standards to evaluate the performance of the organization. So, the aviation industry<br />tended to this area from the eighties of the last century through the development of<br />many standards to ensure the effective application of this process. The basis from<br />the beginning was during manufacturing of the aircraft itself to ensure the presence<br />of replicate systems and alternative systems to ensure the secured operating of<br />aircrafts and with the normal development it became inevitable applying of such<br />process system in all fields of aviation to include the ground handling provided to<br />aircraft to ensure safety as well as achieving the appropriate service time (Ground<br />Time Turn Around).<br />In 2008, Egypt air Ground Sevices began in applying the integrated system of risk<br />management in a scientific way in cooperation with the International Air Transport<br />Association (IATA), this is for the company to be one of the first international<br />companies that apply this system successfully which reflected on the company's<br />reputation through the lower rates of delays and also reducing the value of insurance<br />premiums as a result of improving the ground handling of aircraft after the application<br />of the program.https://amme.journals.ekb.eg/article_37291_d2a4d79ba93ee311f7cf50b704697793.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521515th International Conference on Applied Mechanics and Mechanical Engineering.20120501AIR PERFORMANCE CONFERENCE113729510.21608/amme.2012.37295ENS.ShalashJournal Article20190626ABSTRACT<br />The purpose of this seminar is to highlight the need for an international programme<br />that focuses on upgrading the performance of civil aviation organizations. The<br />proposed programme promotes for performance management, the proper<br />application of different perfomance improvement techniques and problem solving<br />tools to enhance safety and business performance all over all types of civil aviation<br />organizations (such as civil aviation authorities, airlines, airports…etc). The aim is to<br />continually update and improve safety and business standards.https://amme.journals.ekb.eg/article_37295_33b4be66c6ab44a36c771fc5c8220f01.pdf