Military Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401DEVELOPMENT OF A NUMERICAL TOOL AND APPLICATION OF A NOVEL NATURAL FIBRE MATERIAL FOR THE REDUCTION OF VEHICLE CABIN NOISE1183471410.21608/amme.2018.34714END. A.DesaiDoctor, Dept. of Mechanical Engineering, Faculty of Engineering and the Built
Environment, Tshwane University of Technology, South Africa.R. K.DunneGraduate student, Dept. of Mechanical Engineering, Faculty of Engineering and the Built
Environment, Tshwane University of Technology, South Africa.R.SadikuProfessor, Dept. of Chemical, Metallurgical and Material Engineering, Faculty of
Engineering and the Built Environment, Tshwane University of Technology, South Africa.Journal Article20190613ABSTRACT<br />The level and quality of noise experienced by occupants in transportation systems<br />such as military vehicles are issues of increasing concern and are among the major<br />challenges of the automotive industry apart from reducing vehicle mass and product<br />recyclability. Researches have shown that the vibration behaviour of panels that<br />enclose the passenger cabin can affect low-frequency interior noise resulting in<br />adverse effects on the human body or vehicle occupants. However, a compelling<br />amount of anecdotal evidence reported that the characterisation of structure-borne<br />panel vibration and its subsequent noise emission characteristics employing<br />recyclable, sound absorbing, natural fibre composites with an Acrylonitrile Butadiene<br />Styrene (ABS) matrix has not yet been studied within a vibro-acoustic setting. Thus,<br />the primary contribution of this original work was to implement a novel poroelastic<br />natural fibre damping material into a flexible numerical model to predict and improve<br />the vibro-acoustic performance of a vehicle’s cabin when provoked by an external<br />structural forcing function. With reference to an undamped vehicle, a discrete,<br />frequency domain numerical model is developed and experimentally validated based<br />on frequency response data. It was observed that the proposed numerical model<br />effectively and efficiently simulates the noise levels within the vehicle model while the<br />newly developed natural fibre material does reduce cabin noise to a perceivable<br />degree.https://amme.journals.ekb.eg/article_34714_a46d13fcf7f164836b8b9e641d1579eb.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401DEVELOPMENT AND SOUND ABSORPTION TESTING OF A POROELASTIC KENAF/SISAL FIBRE COMPOSITE TRIM FOR LOWERING OF VEHICLE CABIN NOISE LEVELS1113471710.21608/amme.2018.34717ENR. K.DunneJunior Lecturer, Dept. of Mechanical Engineering, Mechatronics and Industrial
Design, Tshwane University of Technology, South Africa.D. A.DesaiSection Head, Senior Lecturer, Dept. of Mechanical Engineering, Mechatronics
and Industrial Design, Tshwane University of Technology, South Africa.R.SadikuProfessor, Dept. of Chemical, Metallurgical and Material Engineering, Tshwane
University of Technology, South Africa.Journal Article20190613ABSTRACT<br />The automotive industry is under pressure to produce a product (vehicle) that is more<br />recyclable and environmentally-friendly with a high fuel efficiency. At the same time,<br />customers are looking for a vehicle that will provide them with a comfortable ride and<br />low cabin noise levels. Therefore, the present work is concerned with the<br />development and characterization of new poroelastic natural fibre-based sound<br />absorbers, which have not yet been contemplated. This newly developed material is<br />to be recyclable and in addition, be an environmentally-friendly alternative to<br />synthetic absorbers which are currently used as internal trims in vehicles. Therefore,<br />several sound absorber variants, based on the above, were developed and tested in<br />order to select an optimally performing product. These sound absorbers are made of<br />different ratios of kenaf and sisal fibres, which are held together by Acrylonitrile<br />Butadiene Styrene (ABS) matrix. On evaluation of the results, it was found that the<br />proposed sound absorbers have airflow resistivity and sound absorption coefficient<br />values compatible to that of normal practice.https://amme.journals.ekb.eg/article_34717_7a989b195ce75ec8ac37c12514b8d4ed.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MODELING AND ANALYSIS OF A SINGLE MASS RESONANT GYROSCOPE1103471610.21608/amme.2018.34716ENS.SayedEgyptian Armed Forces.A.BadawyAssociate Prof., October University for Modern Sciences and Arts- MSA, Egypt.S.WagdyEgyptian Armed Forces.M.HegazyEgyptian Armed Forces.Journal Article20190613ABSTRACT<br />Mathematical and simulation models for a single mass resonant gyroscope are<br />discussed in this paper. The mathematical model discusses the dynamics of a single<br />mass that oscillates in two orthogonal directions and subjected to an angular rotation<br />rate about the third direction. The equations of motion are then solved to get the<br />amplitude of the drive and sense mode responses. The solution is applied to a<br />resonant gyroscope. The sense mode response of the gyroscope as subjected to an<br />angular rate input is determined. Sensitivity analysis is then performed to show the<br />effect of the driving force frequency and the natural frequencies of the drive and<br />sense modes. Finite element simulations of a symmetrical resonant gyroscope are<br />presented, and consequently the mechanical coupling between the two vibrating<br />modes is determined. The sense mode response relative to the angular rate input is<br />simulated and the results are compared to the analytical results.https://amme.journals.ekb.eg/article_34716_5cbdc04b6b0c821ae1fdb88eb4418099.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401UNCERTAINTY ESTIMATION FOR ROTOR VIBRATION AMPLITUDE MEASURING SYSTEM1103471810.21608/amme.2018.34718ENM.MakramEgyptian Armed Forces.S. S.KossaEgyptian Armed Forces.M. K.KhalilEgyptian Armed Forces.A. F.NemnemEgyptian Armed Forces.S.WagdyEgyptian Armed Forces.Journal Article20190613ABSTRACT<br />This study represents a measurement uncertainty model for rotor vibration amplitude<br />measuring system. The measuring system is established to provide a simple way for<br />rotor vibration measurement and consists of a combination of different sensors. A<br />simple data acquisition software is resolved using LabVIEW. This program enables<br />displaying and recording the directly measured data. Type-A and type-B uncertainties<br />are estimated in detail for measuring results. The two different types are combined to<br />evaluate the deviation of readings resulted from several sources. The overall system<br />accuracy for rotor vibration amplitude is derived from combining uncertainties of the<br />two measured perpendicular vibration displacements. An error bar is provided for<br />each reading to indicate the possible deviation with 95 % level of confidence.<br />Uncertainty detailed calculation for rotor vibration amplitude measuring system is<br />computed as a function of the directly measured values.https://amme.journals.ekb.eg/article_34718_2ac091f106683d0c15ffc70fd13ef4ee.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401A 14 DEGREES OF FREEDOM VEHICLE DYNAMICS MODEL TO PREDICT THE BEHAVIOR OF A GOLF CAR1213472010.21608/amme.2018.34720ENM. S.IbrahimDemonstrator, Dept. of Physics and Mathematics, Faculty of Engineering, Ain
Shams University, Cairo, Egypt.M.AbdelazizAssistant professor, Dept. of Automotive, Faculty of Engineering, Ain Shams
University, Cairo, Egypt.A.ElmarhoomyProfessor, Dept. of Physics & Mathematics, Faculty of Engineering, Ain Shams
University, Cairo, Egypt.M.GhoniemaAssistant professor, Dept. of mechatronics, Faculty of Engineering, Ain Shams
University, Cairo, Egypt.Journal Article20190613ABSTRACT<br />A14 Degrees Of Freedom vehicle handling dynamics model is presented and<br />implemented using MATLAB/SIMULINK software. The model is used to predict the<br />behavior of a golf car in different steering conditions. This work is focusing on the<br />vehicle heading modeling as a part of “implementation and control of an autonomous<br />car project” adopted by Autotronics Research Lab (ARL). The vehicle handling<br />related degrees of freedom are calculated. The vehicle yaw rate and lateral<br />acceleration for step and sinusoidal steering wheel excitation are computed to predict<br />the heading of the vehicle. The model results are verified against similar work<br />studying the steering and handling behavior of different cars. The results show good<br />agreement with the literature results.https://amme.journals.ekb.eg/article_34720_488adefd52316a5258be2a7fd0e8e8e9.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401CONVERSION OF AN ALL-TERRAIN VEHICLE INTO A SIX-CHANNEL WIRE REMOTE CONTROLLED UGV1133472110.21608/amme.2018.34721ENM.YacoubEgyptian Armed Forces.M.AsfoorEgyptian Armed Forces.Journal Article20190613ABSTRACT<br />This paper presents a conversion of an All-Terrain Vehicle (ATV) into a wire<br />controlled Unmanned Ground Vehicle (UGV). The vehicle selected was the Kazuma<br />Gator 250 ATV and the control panel used to communicate with the UGV was a sixchannel<br />wired communication. To convert a conventional vehicle into a UGV, four<br />modules needed to be actuated electrically; the accelerator, the steering, the braking<br />and the shifting. The present work illustrates the steps to make such a conversion<br />given two main constraints. The first is not to alter the outer shape and dimensions of<br />the original light vehicle. The second constraint is not to affect the original<br />arrangement of the vehicle controls so that the actuators could be dismantled easily<br />and allows for the normal operation of the vehicle. The deliverable of the work must<br />contain a labeled harness to facilitate further conversion of the wire controlled UGV<br />into a wireless controlled UGV.https://amme.journals.ekb.eg/article_34721_586ec25f8e36e1ddea6e11826bc3b6fe.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MODELING AND ANALYSIS OF HYDRO-GAS SUSPENSION UNIT1143472210.21608/amme.2018.34722ENM. M.Abd-AlazizEgyptian Armed Forces.A. M.SalemEgyptian Armed Forces.W. G.AtaEgyptian Armed Forces.Journal Article20190613ABSTRACT<br />Hydro-gas suspension systems cushion shocks and damp oscillations of vehicle hull<br />when it moves on uneven terrain. The hydro-gas suspension provides the vehicle<br />with proper ride comfort due to non-linear characteristics of hydro-gas units. The<br />hydro-gas suspension system can store a large amount of potential energy;<br />accordingly, it can withstand higher shocks than the torsion bar suspension.<br />Consequently, it is preferred to be used in the design of vehicle suspension. In this<br />paper, a mathematical model for hydro-gas unit used in BMR wheeled vehicle is<br />established to evaluate its characteristics using Matlab /Simulink program. The<br />mathematical model is validated experimentally using the data measured for the unit<br />in laboratory using MTS (793) damper test system. The unit is tested using an input<br />sine wave excitation by a frequency and amplitude corresponding to real road<br />conditions.https://amme.journals.ekb.eg/article_34722_085aa20cd84fb96c606aaae56571689c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401INTRODUCTION TO SYSTEMS ENGINEERING113472410.21608/amme.2018.34724ENS.WiriadidjajaChief executive officer, Engsyspro Inc., Indonesia, and Senior Member of the American Institute for
Aeronautics and Astronautics (AIAA).F.HasimSenior engineer, Center of Technology for Defense and Security Industries, Governmental Agency
for Assessment and Application of Technology (BPPT), Indonesia.G.WibisonoManaging director, Engsyspro Inc., Indonesia.R.RusyadiSenior lecturer, Swiss German University, Indonesia.Journal Article20190613ABSTRACT<br />Systems engineering is an interdisciplinary approach and means to enable the realization of<br />successful systems. It is also considered as the art and science of developing an operable system that<br />meets requirements within often opposed constraints. Systems engineering is a holistic, integrative<br />discipline, wherein the contributions of aerospace engineers, electrical engineers, mechatronic<br />engineers, physics engineers, structural engineers, and many more disciplines are evaluated and<br />balanced, one against another, to produce a coherent whole that is not dominated by the perspective<br />of a single discipline. In fact, systems engineering integrates all the disciplines and specialty groups<br />into a team effort forming a structured development covering a system life cycle, which is commonly<br />used to refer to the stepwise, iterative evolution of a new system from “cradle to the grave”, i.e., from<br />concept through development and on to production, operation, and ultimate disposal.<br />The recognition of systems engineering as a distinct activity is often associated with the effects of the<br />2nd World War. Thereafter, systems engineering has evolved from a process focused primarily on<br />large-scale and complex defense systems to a broader discipline that is used in all kinds of project<br />development. Indeed, systems engineering principles can be applied to any system development.<br />Research and development efforts, on the other-hand, have typically avoided application of structured<br />processes according to systems engineering principles, primarily due to a perception that such<br />structure inhibits the creative processes that are so crucial to the discovery and development of new<br />technologies. Systems engineering principles and creative discovery are, however, not mutually<br />exclusive environments. In the contrary, appropriately tailored systems engineering processes may<br />enable and enhance scientific discovery.<br />In this contribution, the principles and practices of systems engineering will be introduced. Some<br />emphasis is to be given to systems development process, which includes the system life cycle model<br />with its evolutionary characteristics, and the use of the so-called systems engineering method.<br />Through a few case studies, the viewpoints of systems engineering principles will be described.<br />Regarding the scientific discovery, the application of the same principles, including the risk<br />management, to basic research, applied research and development research will be presented. The<br />future state of systems engineering will also be highlighted.https://amme.journals.ekb.eg/article_34724_33b235b1afed3e33844b4320f4bad3b8.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401SOLID ROCKET MOTORS INTERNAL BALLISTIC MODEL WITH EROSIVE AND CONDENSED PHASE CONSIDERATIONS1133472510.21608/amme.2018.34725ENF.MingireanuRomanian Space Agency, Str. Mendeleev; Nr. 21-25; Bucharest; 010362; Romania.N.JulaMilitary Technical Academy, 39-49 George Cosbuc Avenue, Bucharest, RO 040531,
Romania.S.MiclosNational Institute of R&D for Optoelectronics INOE 2000, Atomistilor Street, Magurele,
Ilfov county, 077125, Romania.L.BaschirNational Institute of R&D for Optoelectronics INOE 2000, Atomistilor Street, Magurele,
Ilfov county, 077125, Romania.D.SavastruNational Institute of R&D for Optoelectronics INOE 2000, Atomistilor Street, Magurele,
Ilfov county, 077125, Romania.Journal Article20190613ABSTRACT<br />Solid rocket motors are used for propulsion units of both suborbital and orbital<br />aerospace vehicles. Their main advantages are their simplicity, low cost and<br />reliability. Due to attainable high thrust they have a wide application as boosters (as<br />space shuttle boosters, Delta rocket boosters). They were also used as main stages,<br />retrorocket units, stage separation control units, main propulsion units for suborbital<br />vehicles. An interior ballistics model is implemented and applied for a double base<br />and composite propellant boosters to be used for a boosted dart suborbital vehicle.<br />Erosion and condensed phase are taken into account and numerical results are<br />shown in comparison with experimental data obtained on test firings for each motor.<br />The advantages of the implementation are that it offers a fast calculation of the main<br />parameters of the solid rocket motor unit (thrust, burn time, specific impulse, total<br />impulse). The solid fuel characteristics and the geometry of the motor are contained<br />within two input files while the results of the calculations are presented to the user in<br />a several output files. The motors are built using steel as a casing material and test<br />firings are performed on a horizontal test bench.https://amme.journals.ekb.eg/article_34725_63cd48d03bd8dda10d9a74a114ec8b51.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401PARAMETRIC STUDY ON TAPER-ENDED TUBULAR SOLID PROPELLANT GRAINS1163472610.21608/amme.2018.34726ENM. Y.AhmedEgyptian Armed Forces.Journal Article20190613ABSTRACT<br />The design of the solid propellant grain is a decisive aspect of the solid propellant<br />rocket motor performance. Tubular grain design is a favorable design since it<br />produces a high neutral thrust profile. However, neutrality of tubular grains<br />deteriorates as the aspect ratio of the grain deviates from an optimum value that is<br />dependent on the web thickness. In some cases, the undesirable phenomenon of<br />erosive grain burning may take place. One simple solution to restore neutrality is to<br />add taper to the ends of the grain. Loss of motor filling comes as penalty for adding<br />these tapered ends. The grain should thus be tailored to simultaneously satisfy both<br />desired design objectives namely, neutrality and filling.<br />The present paper aims to address the dependence of these two design objectives<br />on the design of a taper-ended tubular grain. The designs that are likely to yield<br />erosive burning are also addressed. A parametric study is conducted involving the<br />aspect ratio of the grain, its web thickness, and the taper angles on both ends.https://amme.journals.ekb.eg/article_34726_7e1b6a4cd176569642885d16c8923f6d.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401HYBRID OPTIMIZATION OF STAR GRAIN PERFORMANCE PREDICTION TOOL1143472710.21608/amme.2018.34727ENA. E.HashishEgyptian Armed Forces.+Corresponding author.M. Y.AhmedEgyptian Armed Forces.H. M.AbdallahEgyptian Armed Forces.M. A.AlsenbawyEgyptian Armed Forces.Journal Article20190613ABSTRACT<br />In solid propellant rocket propulsion, the design of the propellant grain is a decisive<br />aspect. The grain design governs the entire motor performance and, hence, the<br />whole rocket mission. The ability to decide, during design phase, the proper grain<br />design that satisfies the predefined rocket mission with minimum losses is the<br />ultimate goal of solid propulsion experts. This study enables to predict the pressure<br />time curve of rocket motor with star grain configuration and also to optimize the<br />performance prediction tool through optimization methods to maximize its prediction<br />efficiency. A hybrid optimization technique is used. Genetic Algorithm (GA) is first<br />implemented to find the global optimum followed by Simulated Annealing (SA)<br />optimization method to find the accurate local optimum. A program for predicting the<br />pressure time curve of the rocket motor is created on MATLAB and then linked to GA<br />- SA optimizers as an application on a case study. The purposed approach is<br />validated against satisfying data. It is found that the developed optimized program is<br />capable of predicting rocket motor performance (including the effect of erosive<br />burning) with acceptable accuracy for preliminary design purposes.https://amme.journals.ekb.eg/article_34727_0325436b79546d1bce18ad07201c44ea.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401OPTIMAL DESIGN OF DYNAMIC VIBRATION ABSORBER FOR ROLLING SYSTEMS1163472810.21608/amme.2018.34728ENM. F.YounesAssistant professor, Mechanical Design Dept., Faculty of Engineering – Mataria, Helwan
University, Cairo, Egypt.Journal Article20190613ABSTRACT<br />This work deals with the reduction of vibration levels for rolling systems such as<br />ropeway gondola, cranes and ships using a dynamic vibration absorber (DVA). The<br />optimum values of the DVA damping factor and the spring constant are determined<br />numerically through minimizing a maximum response of the main system. Single<br />DVA (SDVA) and multi- masses DVA (MDVA) in parallel configurations are<br />examined. A Mini-max criterion optimization method is utilized to calculate the<br />optimum design parameters of the DVA for many numbers of DVA masses with a<br />constant total mass. The results obtained that the rising of the mass ratio leads to<br />decrease the vibration levels. Using the MDVA leads to enhanced robustness and<br />vibration attenuation in the main system at the expense of growing the vibration in<br />the absorber. MDVA compared with SDVA have some advantages such as lower<br />frequency ratios and low fatigue.https://amme.journals.ekb.eg/article_34728_9aaad37c7edf6ff47bb3f54bc8d08248.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MACHINE HEALTH MONITORING USING VIBRATION ANALYSIS1223472910.21608/amme.2018.34729ENE. A.NabbyGraduate student, Dept. of Production Engineering and Mechanical Design, Faculty of
Engineering, Menoufia University, Shebin EL-Kom, Egypt.M. H.BelalDr., Dept. Production Engineering and Mechanical Design, Faculty of Engineering, Menoufia
University, Shebin EL-Kom, Egypt.F. R.GomaaProfessor, Dr., Dept. of Production Engineering and Mechanical Design, Faculty of Engineering,
Menoufia University, Shebin EL-Kom, Egypt.Journal Article20190613ABSTRACT<br />Vibration analysis is an effective tool to identify and predict failure using Signal<br />Processing based on condition monitoring. Accordingly, machine faults can be<br />detected and diagnosed using different post processing of vibration signature. The<br />present study is to prove that Machine Health and availability achievement becoming<br />easier by using different vibration analysis techniques. Three different types of<br />nonstationary signals are addressed in this paper to evaluate the technical conditions<br />of Paper Machine Forming Roll. Forming Roll consists of frequency drive motor,<br />gearbox and a symmetric rotor supported on two similar bearings. The present study<br />is focusing on Forming Roll Bearings Condition Monitoring. A cost wise comparison<br />of maintenance strategies is made to confirm that Condition based Maintenance is<br />the most cost-effective strategy. In the past portable data-collectors were used to<br />measure vibration levels, but Condition based Monitoring had taken place to avoid<br />any sudden fault developing before next time schedule. Applying different vibration<br />analysis techniques such as Spectrum, Waveform and Impact Demodulation will<br />support fault detection, diagnosis and decision-making. The present study proved<br />that Impact demodulation is recommended to specify faulty bearing source location<br />and severity, while time waveform or spectrum analysis techniques can detect fault<br />progress but couldn’t distinguish severity due to bearings similarity. Based on Impact<br />Demodulation technique decision is made to exchange only the higher severity faulty<br />bearing and postponed the other one for next planned shutdown. Consequently, the<br />machine availability and health can be achieved by reducing vibration impact around<br />100 % through continuous condition monitoring.https://amme.journals.ekb.eg/article_34729_c35de6218dc49b15e009833a5803ed16.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401INVESTIGATIONS ON DAMPING CHARACTERISTICS OF LIQUID COLUMN VIBRATION ABSORBER1113473010.21608/amme.2018.34730ENM. F.YounesAssistant professor, Mechanical Design Dept., Faculty of Engineering – Mataria,
Helwan University, Cairo, Egypt.Journal Article20190613ABSTRACT<br />This work deals with the damping characteristics and optimum performance of a<br />passive liquid column vibration absorber (LCVA) which is effective to decrease the<br />vibration of engineering systems. A numerical technique is applied to solve the<br />nonlinear equations of motion to study the influence of the design parameters such<br />as frequency tuning ratio, length ratio, area ratio, blocking ratio and mass to mitigate<br />excessive vibrations. A constrained multi-objective optimization problem is<br />constructed and solved numerically to minimize the maximum master structure<br />displacement in a broad range of excitation frequency with considering a limit of the<br />maximum liquid displacement in the vertical tube as an extra objective. It is found<br />that the best vibration attenuation can be achieved by using the LCVA with a uniform<br />cross-section area while the non-uniform LCVA offer greater flexibility to modify the<br />non-appropriate total length. The TCVA mass and the structural damping have an<br />influence on all optimum parameters. The optimal values of the blocking ratio are<br />proportional and depend on the intensity of the excitation. The list of necessary<br />optimal parameters and the corresponding performance indices are presented in<br />design tables as a guidance for industrial practices.https://amme.journals.ekb.eg/article_34730_b18bde47a5bfde3a7c76698e3d2a7daa.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401FEATURE EXTRACTION ENHANCEMENT BASED ON PARAMETERLESS EMPIRICAL WAVELET TRANSFORM: APPLICATION TO BEARING FAULT DIAGNOSIS1193473110.21608/amme.2018.34731ENH. H.El-MongyAssistant professor, Dept. of Mechanical Design, Faculty of Engineering-Mataria,
Helwan University, Cairo, Egypt.Journal Article20190613ABSTRACT<br />Rolling-element bearings are usually subject to faults that need prompt<br />detection in order to prevent sudden failures. Many time-frequency analysis<br />techniques have been used for the purpose of bearing fault detection and<br />diagnosis. From these techniques, wavelets and empirical mode<br />decomposition (EMD) stand out as the most widely applied methods in<br />bearing fault diagnosis. Recently, a novel method named the parameterless<br />empirical wavelet transform (PEWT) has been proposed to combine the<br />wavelet formulation with the adaptability of the empirical mode<br />decomposition. In this paper, the parameterless empirical wavelet transform<br />(PEWT) is combined with envelope detection (ED) to present a new scheme<br />named PEWT-ED for non-stationary signal analysis. The capabilities and<br />limitations of the new method in bearing fault diagnosis are investigated<br />using simulation and experiment. The results show that the new approach<br />can effectively extract the bearing fault characteristics. The PEWT-ED is<br />found to be a powerful tool in signal de-noising and enhancement for fault<br />diagnosis purposes.https://amme.journals.ekb.eg/article_34731_09dd8ce569b12d41864bccde180c8a56.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401HIGH ACCURACY SPACECRAFT ORBIT PROPAGATOR VALIDATION193473210.21608/amme.2018.34732ENA.RefaatEgyptian Armed Forces.A.BadawyAssoc. Prof., October University for Modern Sciences and Arts (MSA), Egypt.M.AshryEgyptian Armed Forces.AdelOmarEgyptian Armed Forces.Journal Article20190613ABSTRACT<br />The Space Situational Awareness (SSA) problem is becoming an exponentially<br />significant concern for satellite operators. The threat of on-orbit collisions endangers<br />satellites, spacecrafts and astronauts themselves especially in low-earth orbits<br />(LEO). Many collisions occurred between satellites and debris that include natural,<br />operational and non-operational objects in space. The collision between Russian<br />cosmos 2251 and American iridium 33, for instance, imposed the need for an<br />accurate orbital propagation module. In order to perform successful collision<br />avoidance maneuvers, the mission operators need the orbit prediction to be highly<br />accurate. Simple impractical number of collision avoidance maneuvers represents<br />dreadful solution to escape of collision. Fake warning means waste of fuel and<br />resources of satellite. This paper introduces an enhanced model to increase the<br />accuracy of propagation estimation based on a precise perturbation model.https://amme.journals.ekb.eg/article_34732_a8d813b06e1944103f5e9b127c9f2d27.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EXPERIMENTAL VERIFICATION OF COMPOSITE MATERIAL WITH CHOPPED FIBER GLASS IN PHENOL AS A ROCKET NOZZLE INSULATION1213473410.21608/amme.2018.34734ENA.SeifEgyptian Armed Forces.H.KamalEgyptian Armed Forces.Kh.ShoukryEgyptian Armed Forces.O.KamalEgyptian Armed Forces.A. N.ZayedProf., Faculty of Engineering, Heliopolis University, Cairo, Egypt.Journal Article20190613ABSTRACT<br />This work deals with the characterization of chopped fiber glass composite. The resin<br />matrix was a phenol base. Sheets of this composite have been cured and cut to<br />make sample specimens for testing. Four mechanical testing have been conducted<br />for these material including tensile test at different temperatures, bending test,<br />compression test and hardness test. Three thermal tests including thermal<br />conductivity determination, thermal expansion coefficient determination and ablation<br />test have been conducted. The results show that this material has very good thermal<br />properties capable of resisting high temperatures.<br />A nozzle for rocket motor has been made from this material as insulators, and static<br />firing test has been conducted and the temperatures inside this composite material<br />have been measured. Investigation of the thermal loads response of composite<br />nozzle has been done using FE using ANSYS package software and the calculated<br />temperatures have been recorded from the same places that chosen in the real firing<br />test. By comparing the measured and obtained temperature for the fiber glass, there<br />is a great agreement between them. The selected composite material resists the high<br />temperatures so this used as thermal protective material.https://amme.journals.ekb.eg/article_34734_a613708e2b00a721bb9f6aa733cc0459.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401STRUCTURAL AND PERFORMANCE OF THERMOPLASTIC BASED COMPOSITE WITH ZEOLITE FILLER1153495010.21608/amme.2018.34950ENH. A.HafezDr. Eng., Consultant in Material Science, EGYPT.Journal Article20190616ABSTRACT<br />In this work, new nano and micro thermoplastic based composite is prepared with<br />zeolite filler, the method involves using zeolite in powder form, the preparation of<br />zeolite powder from ores by crushing it into small-sized granules. The characteristics<br />of the zeolite powder are determined. The physical properties and chemical<br />composition (XRD) are evaluated before impeding it into the thermoplastic.<br />Thermoplastics powders are added to the zeolite powder as granules in different<br />sizes, the particles sizes ranging from the size of a millimeter to nanometer. The<br />manufacturing quality parameters are optimized at volume percentages of filler in the<br />range 20 to 25 %, composite material is formed into molds. New Composite material<br />is characterized by easy deformation into different shapes beside machine ability.<br />The characteristics of new composite such as SEM, EDX,FTIR in absorption and<br />transmission mode are evaluated and compared with the standard characteristics of<br />Zeolite ores. The performance and characteristics of the new composite are<br />completely different. The new composite is hard, solid and does not absorb water.<br />The work ends with list of recommendation about the new field and expected<br />application of Zeolite when using it as filler in thermoplastic based micro and nano<br />composites.https://amme.journals.ekb.eg/article_34950_1a1fa1731f832efd5b58bc644aca7821.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EFFECT OF ELECTRON BEAM WELDING PARAMETERS ON DISSIMILAR JOINTS OF AISI 430 FERRITIC STAINLESS STEEL AND AISI 1020 LOW CARBON STEEL1143495210.21608/amme.2018.34952ENM.Nasr El-DeenEgyptian Armed Forces.M. E.ShamekhEgyptian Armed Forces.W.ElthalabawyEgyptian Armed Forces.M. T.SallamEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />This paper presents the optimization of welding parameters of electron beam welded<br />joint of dissimilar materials namely AISI 430 ferritic stainless steel and AISI 1020 low<br />carbon steel (0.21% C.). Three main welding parameters were investigated. These<br />parameters are welding current, focusing current and welding speed. The<br />optimization was based, from one hand, on microstructure analysis of both bead and<br />heat affected zones, using optical and scanning electron microscopes, and, from the<br />other hand, the evaluation of tensile, impact, and micro-hardness mechanical<br />properties. The results of the investigation showed that, an optimum welding current<br />of 24 mA, a focusing current of 875 mA, and a welding speed of 8mm/s at a working<br />distance 100 mm can provide uniform welding bead with full penetration, without<br />undercuts and a narrow width of HAZ. Moreover, they can secure a tensile failure<br />outside the joint, in the base metal (low carbon steel) satisfying a tensile strength of<br />about 431 MPa. Furthermore, the impact resistance of the joint was found to provide<br />about 160 J/cm2 (hammer against the root of bead) and about 60 J/cm2 (hammer<br />against the face of bead). The hardness distribution along the joint from the stainless<br />steel side to the low carbon steel side through the bead and HAZ was determined,<br />and indicates that, a maximum hardness of about 380 HV was obtained in the center<br />of the bead. This value is higher than the obtained hardness values of both the ferritic<br />stainless steel and low carbon steel.https://amme.journals.ekb.eg/article_34952_a65e78e25f5f202794ad05a1fd50909e.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EFFECT OF CYCLIC PLASTIC DEFORMATION ON THE MECHANICAL PROPERTIES OF SPRING STEEL DIN 50Cr31133495510.21608/amme.2018.34955ENO.ElzahedEgyptian Armed Forces.+Corresponding author.M. TolbaSallamEgyptian Armed Forces.K.AlmazyEgyptian Armed Forces.M. M.OsmanEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />In this study the effect of cyclic plastic deformation on the mechanical properties of a<br />light duty grade of spring steel DIN 50Cr3, commonly used in leaf spring was<br />investigated. This steel has a chemical composition of 0.25% C, 0.8% Cr, 0.79% Mn,<br />and 0.2% Si. Primarily, standard tensile specimens of this steel were cut and<br />subjected to a quenching and tempering heat treatments. Austenitization was carried<br />out at 870oC for 1h followed by quenching in oil and then tempering was applied at<br />450oC for 1h. Subsequently, Different pre-plastic deformation strains of 1%, 2%, and<br />2.5% were applied followed by various number of tensile stress cycles from zero to a<br />maximum stress of 9%, 12.5%, and 16.5% over the offset yield stress of the<br />quenched and tempering specimens. These plastic strains and stress cycles can<br />simulate the possible over loading of the vehicle. By increasing the number of cycles<br />under a constant amplitude for a given fixed pre-plastic strains, the ultimate and<br />offset yield strength of the spring material were sensibly increased while ductility was<br />drastically decreased.https://amme.journals.ekb.eg/article_34955_9d168b5b57f6380131fac60068713ec9.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EXPERIMENTAL AND FINITE ELEMENT ANALYSIS OF BOLT-HOLE CLEARANCE EFFECTS IN COMPOSITE JOINTS1223495610.21608/amme.2018.34956ENU. A.KhashabaMechanical Engineering Department, Faculty of Engineering, King Abdulaziz University,
P.O. Box 80204, Jeddah 21589, Saudi Arabia.+Corresponding author.T. A.SebaeyMechanical Design and Production Engineering Department, Faculty of Engineering,
Zagazig University, P.O. Box 44519, Zagazig, Egypt.Al SelmyAl SelmyMechanical Design and Production Engineering Department, Faculty of Engineering,
Zagazig University, P.O. Box 44519, Zagazig, Egypt.Journal Article20190616ABSTRACT<br />Bolt-hole clearance effects on bearing strength of bolted joints in cross-ply, [0/90]2s,<br />glass fiber reinforced epoxy (GFRE) composites, were investigated experimentally<br />and numerically. A series of ASTM tests (tensile, compressive and shear) were<br />conducted on a unidirectional laminates to find the lamina properties, which were<br />used as input to a 3D developed progressive damage model (PDM). The model was<br />built with the aid of ABAQUS software, nonlinear Hashin failure criteria and Riccio<br />property degradation rules. The PDM was used to predict the failure load and mode<br />of composite bolted joint with bolt-hole clearance of 0, 50, 100, 200, 300 μm. Bearing<br />strength was determined according to three different criteria: load at 4% hole<br />deformation, first peak load and ultimate load. The numerical results of the ultimate<br />strength agree well with the experimental ones with a maximum deviation of 7.1 %.<br />Increasing the bolt-hole clearance from 0 to 300 μm reduces the contact area by<br />17.8% and increasing the contact pressure by 26.6 %. Accordingly, the 4% HDS, first<br />peak bearing strength, the measured ultimate strength and the predicted ultimate<br />strength were decreased respectively by 20.9%, 34.0%, 14.2% and 8.8%. On the<br />other hand, the failure mode did not affected by increasing the bolt-hole clearance<br />within the investigated values.https://amme.journals.ekb.eg/article_34956_5cd565c01f0ccc73ae0ac38482b507e4.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401INVESTIGATING WEAR RESISTANCE OF LOW CARBON STEELS REINFORCED BY SIC SUBMICRON SIZED PARTICLES1113495710.21608/amme.2018.34957ENT.MattarProfessor and President of Centre of Metallurgical Research and Development
Institute CMRDI.M. K.El-FawakhryLecturer, Centre of Metallurgical Research and Development Institute CMRDI.I.El-MahallawiProfessor and Head of Mining, Petroleum and Metallurgical Engineering
Department, Faculty of Engineering, Cairo University.Journal Article20190616ABSTRACT<br />The development of new steel grades with improved mechanical properties by the<br />addition of nanoparticles to microalloyed steels has recently gained attention. Misfit,<br />size, thermal expansion coefficient, density, wettability and stability were reported to<br />have an effect on the properties. The main challenge is the development of these<br />nanostructured constituents by modified conventional and advanced manufacturing<br />techniques. This work discusses the options for applying nanoinoculation techniques<br />to produce new nanodispersed steel grades, with improved mechanical properties. At<br />this stage of work submicron sized particles coated with Cu were selected in order to<br />avoid wettability and agglomeration problems. The inoculant was added in different<br />ratios starting from 0.025% up to 0.10% to the steel melt and the stirring of the melt<br />was secured via the induction current heating for 4 minutes. The produced alloy was<br />tapped in an iron ingot, and then hot forged into bars and plates. Optical microscopic<br />studies were performed on the new material in order to identify the microstructural<br />features. The wear abrasion resistance was detected using a wear test. It is shown<br />that these new steel grades have improved wear friction coefficients; though higher<br />wear rates at the studied load and time conditions. This opens a new path for<br />investigations on the wear resistance of nanodispersed and nanoinoculated steels.https://amme.journals.ekb.eg/article_34957_c190dfa2e15f32a711fdd0022a6fe917.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401INFLUENCE OF SOLIDIFICATION RATE ON ELECTRICAL AND MECHANICAL PROPERTIES OF EUTECTIC AND HYPEREUTECTIC AL-SI ALLOYS1143495910.21608/amme.2018.34959ENM. M.MeizGraduate student, Production Engineering and Mechanical Design Department, Faculty of
Engineering, Minoufia University, Shebin El-Kom, Egypt.M. S.El-WazeryLecturer, Production Engineering and Mechanical Design Department, Faculty of
Engineering, Minoufia University, Shebin El-Kom, Egypt.S. M.KhafagyAssociate Professor, Tabbin institute for metallurgical studies, Cairo, Egypt.R. A.ElsadLecturer, Basic Science Department, Faculty of Engineering, Minoufia University, Shebin
El-Kom, Egypt.Journal Article20190616ABSTRACT<br />Eutectic Al–13 wt. % Si and hypereutectic Al-16 wt. % Si were prepared by using<br />permanent mould casting technique. Effect of the cooling technique on the cast<br />microstructure, mechanical properties, and electrical conductivity of Al-Si alloys was<br />investigated by using the conventional water-cooled and air-cooled methods. The<br />mechanical properties such as the yield stress, tensile strength, hardness, and<br />impact energy were measured at various cooling methods. Microstructure with<br />scanning electron microscope (SEM) and Energy dispersive spectrometer (EDS)<br />analysis of Al-Si alloys have been studied. In addition, the hardness after solution<br />treatment at 529 °C for 2 h and artificial ageing at various temperatures 180 °C and<br />210° C for aging time 2- 10 h was measured. The results show enhancement in the<br />mechanical and electrical properties for the eutectic Al-13 wt. % Si and hypereutectic<br />Al-16 wt. % Si alloys for the water-cooled over the air-cooled technique. In addition,<br />the largest value of the impact energy (4.91 J) was obtained for the eutectic Al-13 wt.<br />% Si alloys compared to the hypereutectic Al-16 wt. % Si alloys at 3.09 J for watercooled-<br />medium. The total solidification time (TST) of Al 13% wt. Si was longer than<br />that time for the hypereutectic Al 16% wt. Si at various cooling mediums. Aging<br />studies of Al-Si alloys with aging temperatures 180 ºC and 210 ºC show that the<br />hardness values increased as the silicon content increases. For hypereutectic Al-16<br />wt. % Si at aging temperature 180 ºC and aging time 4 h by using water-cooled<br />technique, it was observed that the maximum hardness value reached to 100 HRD<br />compared that value was 87 HRD for the eutectic Al-13 wt. % Si alloy.https://amme.journals.ekb.eg/article_34959_3a2cbd1508e4280819d68f56dbef0c92.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MODELING OF THE WELD BEAD SHAPE AT DIFFERENT WELDING PARAMETERS1113496010.21608/amme.2018.34960ENA. A.Abd ElsalamAssistant Lecturer at Mechanical Engineering Dept., Faculty of Engineering, Helwan
University, Cairo, Egypt.S.ElAtribyLecturer at Mechanical Engineering Dept., Faculty of Engineering, Helwan University,
Cairo, Egypt.A. F.BarakatProfessor at Mechanical Engineering Dept., Faculty of Engineering, Helwan University,
Cairo, Egypt.M.Abdel GhanyProfessor at Electrical Engineering Dept., Faculty of Engineering Helwan University,
Cairo, Egypt.Journal Article20190616ABSTRACT<br />This paper tends to discuss the relation between welding parameters (Voltage, Arc<br />Current and Travel Speed) and the deposited lines shape (width, height and<br />penetration) in metal deposition process. Due to the high nonlinearity of the process<br />ANN (artificial neural network) was found to be the best chose for representing it.<br />ANN is trained off-line under different operating conditions then used for prediction of<br />the system model for further optimization of the process. The results show the<br />capability of the developed ANNs to represent the process properly. Supervised<br />learning with back propagation technique was used to make the networks. Best<br />network for width consisted of tansig functions with an output layer of linear function.<br />Traingd function gave the best result for width. Best network for penetration consisted<br />of tansig functions with an output layer of linear function. Traingd function gave the<br />best result for penetration. Best network for height consisted of mixture of radial<br />basis, tansig functions with an output layer of linear function. Traingd function gave<br />the best result for height.https://amme.journals.ekb.eg/article_34960_4c23ef944796cd9781ae51cf6769e5e2.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401THE EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A356/ZrO2 NANO REINFORCED COMPOSITES1133496110.21608/amme.2018.34961ENH.TiweryDepartment of Design and production Engineering. Faculty of Engineering, Ain Shams
University, P.O. Box 11517, Cairo, Egypt.W.HoziefaDepartment of Metallurgy, Mining & Petroleum Engineering, Faculty of Engineering, Al-
Azhar University, P.O. Box 11884, Cairo, Egypt.Adel B.El-ShabasyDepartment of Design and production Engineering. Faculty of Engineering Ain Shams
University, P.O. Box 11517, Cairo, Egypt.I.El-MahallawiDepartment of Metallurgical Engineering, Faculty of Engineering, Cairo University, P.O.
Box, 12316 Giza, Egypt.Journal Article20190616ABSTRACT<br />Aluminum A356 alloys have several interesting properties to be used in automobile<br />and aircraft industries. Recent studies have shown that the properties of cast<br />aluminum alloys are modified by the insertion of reinforcement nanoparticles. This<br />study investigates the microstructure and mechanical properties of ZrO2<br />nanoreinforced A356 alloy in T6 heat treated condition. Some samples of as cast<br />monolithic A356 and 3% ZrO2 nanoparticles (30nm) reinforced A356 were<br />prepared by stir casting from the semi-solid state followed by T6 heat treatment<br />process. The samples were solution treated at temperature of 550°C for 2hours<br />followed by aging at different temperatures (170°C&180°C), for different aging time<br />(2hr,4hr&6hr). The results obtained in this work showed enhancement in the<br />mechanical properties (ultimate strength, ductility and hardness). The as cast<br />samples showed values of 119 MPa,4.5% &23 HRB, respectively, while the<br />3%ZrO2 reinforced samples showed the values of 165MPa,4.7% &60 HRB,<br />respectively. After T6 heat treatment, the same values changed to 198MPa, 6.4%<br />&70HRB, respectively for the nanoreinforced samples. The microstructure<br />morphology was changed from lamellar eutectic structure to spheriodized eutectic<br />structure.https://amme.journals.ekb.eg/article_34961_717e53cebc79caab4c711ff6bb8d8409.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MESOPOROUS MATERIAL PROCESSING AND APPLICATION113496210.21608/amme.2018.34962ENHyung-HoParkProfessor, Dept. of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro,
Seodaemun-gu, Seoul 03722, Korea. Telephone no.: 82-2-2123-2853; Fax no.: 82-2-312-
5375.Journal Article20190616ABSTRACT<br />Mesoporous ceramic materials have a structure containing nano-sized pores of 2~50<br />nm. Their pore size, pore distribution (regular/irregular, open/close), and pore shape<br />can be controlled easily during sol-gel procedure using evaporation induced self<br />assembly (EISA). During the EISA process, the pore structure of the films including<br />porosity, pore size, and pore distribution can be controlled by varying the surfactant<br />molar ratio. The existence of pores in the material grants distinctive properties such<br />as decreased dielectric constant from increased porosity and decreased thermal<br />conductivity from increasing phonon scattering. Therefore the mesoporous ceramic<br />thin films can be used in many applications such as thermal insulators, low dielectrics,<br />thermoelectrics, gas sensors, and so on.<br />Mesoporous titania and manganese-based films were prepared and their<br />thermoelectric properties were investigated. The efficiency of a thermoelectric is<br />determined by its dimensionless figure of merit, Z = S2<br />/ where S, , and are the<br />Seebeck coefficient, electrical conductivity, and thermal conductivity, respectively.<br />Various experimental approaches including a control of pore structure and<br />introductions of dopants and nano-materials to enhance the thermoelectric property<br />are discussed. Through the approaches, an individual control of governing<br />parameters was carried out to control the thermal conductivity and electrical<br />conductivity of mesoporous oxides to maximize the thermoelectric property.https://amme.journals.ekb.eg/article_34962_4dc2e77f44d6afbc37863751654bc1a8.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MECHANICALLY STABLE ORGANIC-INORGANIC COMPOSITE AEROGELS113496310.21608/amme.2018.34963ENKyu-YeonLeeDepartment of Materials Science & Engineering, Yonsei University, 50 Yonsei-ro,
Seodaemun-gu, Seoul 03722, Korea. Telephone number: 82-2-2123-2853, Fax number:
82-2-312-5375.Hyung-HoParkDepartment of Materials Science & Engineering, Yonsei University, 50 Yonsei-ro,
Seodaemun-gu, Seoul 03722, Korea. Telephone number: 82-2-2123-2853, Fax number:
82-2-312-5375.Journal Article20190616ABSTRACT<br />Aerogels are promising materials due to their excellent properties such as wide<br />surface area, low thermal conductivity, low density and high porosity, so they are<br />known as eminent candidate for future material technology. These characteristics can<br />be utilized for various purpose such as catalyst, ion exchange resin, filter, drug agent,<br />heat, sound insulator and so on. However, aerogels are too fragile and brittle due to<br />their low mechanical strength, so there are some difficulties in industrial and<br />commercial applications. To overcome the weaknesses of aerogels, organicinorganic<br />composite aerogels were presented as one of the solution to improve<br />mechanical characteristics of aerogels. The present paper focuses on the<br />complementary enhancement of mechanical characteristics using functional,<br />mechanically strong organic materials in the inorganic-based aerogels. In this paper,<br />some studies of organic-inorganic composite aerogels are introduced and an<br />improvement of aerogel characteristics is provided.https://amme.journals.ekb.eg/article_34963_517b5ef3ce2b1e80105b32442a764f49.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401OPTIMIZATION OF SHAPE MEMORY EFFECT IN FE-BASED SHAPE MEMORY ALLOYS BY MODIFICATION OF SOLUTION TREATMENT TEMPERATURE193496410.21608/amme.2018.34964ENM. K.El FawkhryCentral Metallurgical and Research and Development Institute (CMRDI), Cairo,
Egypt.+corresponding author.V.SampathDepartment of Metallurgical and Materials Engineering, Indian Institute ofT.MattarCentral Metallurgical and Research and Development Institute (CMRDI), Cairo,
Egypt.Journal Article20190616ABSTRACT<br />Solution treatment is an important process parameter in the context of thermo<br />mechanical processing of shape memory alloys. It is one of the preliminary steps that<br />is required to obtain martensite in the alloys. As far as martensite is concerned, it<br />forms the basis of shape memory effect as shape memory alloys are used<br />capitalizing on their unique properties of shape memory effect and superelastic<br />effect. It is well known that the grain size of austenite in the solutionized condition<br />depends on the austenitizing/solutionizing temperature. Moreover, the solution<br />treatment temperature influences the transformation temperatures of SMAS. It has<br />been found by researchers that solutionizing temperature brings about modification in<br />the grain size, the grain boundary angles, and the annealing twins. The major<br />objective of the present work is to assess the influence of modifications in the<br />microstructural features brought about increasing/decreasing the solution treatment<br />temperature. Optical microscopic and back scattered electron diffraction studies<br />reveal the microstructural changes brought about by changing the solutionizing<br />temperature. The X-ray diffraction experiments reveal the increase in SIEM in the<br />alloy that was solution treated at 800, 900, 1000°C.<br />The TEM studies reveal the formation of stacking faults and their interaction with one<br />another and also with the grain boundaries. The results indicate that solutionizing at<br />an optimal temperature of 1000°C leads to increased shape recovery strain as well<br />as shape recovery stress. The results are presented and discussed in the paper.https://amme.journals.ekb.eg/article_34964_752230de03d8a1c739c33519e5767ce6.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401SYNTHESIS OF Mg-Cu-Y BULK METALLIC GLASS PLATE VIA SPRAY FORMING PROCESS1103496510.21608/amme.2018.34965ENR. H.Arison KungDepartment of Materials Science and Engineering, National Cheng Kung
University, Tainan, Taiwan, ROC.M.-L.Ted GuoDepartment of Materials Science and Engineering, National Cheng Kung
University, Tainan, Taiwan, ROC.K. F.ChangDepartment of Materials Science and Engineering, National Cheng Kung
University, Tainan, Taiwan, ROC.Chi-Y. A.TsaoDepartment of Materials Science and Engineering, National Cheng Kung
University, Tainan, Taiwan, ROC.+Corresponding authorJ. C.HuangDepartment of Materials Science and Engineering, National Sun Yat-Sen
University, Kaohsiung, Taiwan, ROC.J. S.C.JangDepartment of Materials Science and Engineering, I-Shou University, Kaohsiung,
Taiwan, ROC.Journal Article20190616ABSTRACT<br />Mg-based amorphous alloys exhibit maximum specific strength among bulk metallic<br />glass systems. In this study, a bulk Mg65Cu25Y10 deposit was produced successfully<br />via spray forming process with higher cooling rate than conventional mold casting<br />route. The deposit is 300mm in diameter, 10 mm in thickness and 650 g in weight.<br />The average porosity is about 10%. The XRD and DSC results of the deposit look<br />similar to that obtained from corresponding amorphous melt-spun ribbon. However,<br />the measured composition of deposit varies slightly with the distance from substrate,<br />which attribute to gravity effect of relative heavy element, like Y and Cu. The<br />hardness of the deposit is higher than that of melt spun ribbons. The supercooled<br />liquid region of the deposit determined from TMA technique is about 20K smaller than<br />that obtained from DSC trace due to the stress induced nanocrystallzation occurred<br />in the former. In addition, the volume reduction of deposit during TMA test was also<br />smaller than that of ribbon and shows better dimension stability.https://amme.journals.ekb.eg/article_34965_1d4469cc01fdf47bea3503dace209c52.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401CORRELATIONS BETWEEN HIGH-TEMPERATURE DEFORMATION AND MICROSTRUCTURE113496610.21608/amme.2018.34966ENFarghali A.MohamedProfessor, Dept. of Chemical Engineering and Material Science, Dept. of Mechanical and
Aerospace Eng., University of California, Irvine, U.S.A.Journal Article20190616ABSTRACT<br />High-temperature deformation in materials is highly sensitive to microstructure.<br />Accordingly, seeking correlations between mechanical behaviour and microstructure<br />represent an effective approach that can clarify issues or settle controversies related<br />to high-temperature deformation. There are several microstructural techniques that<br />can be adopted to explore the presence of these correlations. This presentation<br />reviews examples of the application of some microstructural techniques, especially<br />transmission electron microscopy (TEM), to several areas of high-temperature<br />deformation.https://amme.journals.ekb.eg/article_34966_14289580147a76cc2090a0896fe4e5c1.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401IRRADIATION INDUCED-HARDENING AND EMBRITTLEMENT OF REACTOR PRESSURE VESSEL STEELS AS REVEALED BY ATOMIC LEVEL SIMULATIONS113496810.21608/amme.2018.34968ENA. T.AlAsqalaniPhysics Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt.Journal Article20190616ABSTRACT<br />The increase of computing power in recent years has made large scale simulation<br />with million, or even billion of atoms is possible. Computer simulations using classical<br />interatomic potentials are an efficient tool to study and understand materials<br />properties and to investigate processes of materials on the atomic level. In this<br />manner length and time scales can be considered which are often hardly accessible<br />by experiments. In the talk two different applications of atomistic simulations are<br />considered.<br />In the first topic the energetics and thermodynamics of the coherent copper<br />nanoclusters in bcc-Fe are obtained using a combination of on-lattice Monte Carlo<br />simulations and off-lattice molecular dynamics. These nanoclusters are assumed to<br />be the main cause of hardening and embrittlement of Cu-bearing reactor pressure<br />vessel steels since they act as obstacles to dislocation motion within the grains of the<br />polycrystalline bcc-Fe.<br />The second topic about the fracture of ferrite steels (structural materials for nuclear<br />fission reactors) during neutron irradiation in which the interaction between<br />embedded nanocluster and an edge crack in the framework of linear elastic fracture<br />mechanics (LEFM), are investigated at nanoscale using molecular static (MS)<br />simulations.https://amme.journals.ekb.eg/article_34968_f4cd0ad08376b1f2b2d7a59fc1ea4c63.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401THE AGING EFFECTS IN NiTi SHAPE MEMORY ALLOY WIRE183497010.21608/amme.2018.34970ENI.ÖzkulDepartment of Mechanical Engineering, Faculty of Engineering, Mersin University, Mersin,
Turkey.V.SampathDepartment of Metallurgical and Materials Engineering, Indian Institute of Technology
Madras, Chennai-600 036, India.C. A.CanbayDepartment of Physics, Faculty of Science, Firat University, Elazig, Turkey.M.ElFawkhryCentral Metallurgical Research Laboratory, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Shape memory alloys occupy a niche position in the domain of advanced materials<br />that have great relevance to medical, engineering, commercial as well as<br />miscellaneous applications. The transformation temperatures of the alloys are<br />immensely important since they decide the specific applications of the alloys in a<br />field. These temperatures are influenced by a host of factors, including composition<br />and thermo-mechanical history of the alloy. In fact, due to continued usage also the<br />transformation temperatures are shifted due to what is known as functional fatigue,<br />which is caused by the build-up of defects within the alloys during use. The horizon of<br />usage of shape memory alloys is ever widening. In the present study, therefore, the<br />effects of aging on the transformation temperatures of NiTi alloys are explored. The<br />martensitic transformation temperatures of the alloys were measured by differential<br />scanning calorimetry, while their microstructures were investigated by optical<br />microscopy. The results show that the aging temperatures as well as the holding<br />times influence the microstructure, which directly affects the transformation<br />temperatures. Aging at high temperature induces precipitation, leading to an increase<br />in the Ti content of the matrix. This in turn caused an increase in the transformation<br />temperatures. On the other hand, aging at low temperature caused stress relief<br />leading to a shift in the transformation temperatures.https://amme.journals.ekb.eg/article_34970_2dab159a89d5b2a8f1ce45615d1493ac.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401WEAR TESTING MACHINE BY LASER BEAM ABLATION113497110.21608/amme.2018.34971ENH. A.HafezDr. Eng., Consultant in material science, Egypt.Journal Article20190616ABSTRACT<br />Wear testing machine by laser ablation has been considered as a new machine for<br />wear measurement. It overcomes the problems generated by old machines and<br />systems. In this case, wear rate has occurred due to ablation by laser beam and test<br />sample transformed from solid state to gas state directly (sublimation) and avoid<br />relative movement and loss of material between sample and disk or plate. The<br />different operation conditions such as temperature, chemicals, environmental<br />conditions and different types of stresses have been considered. The new machine<br />consists of two main parts; optical and mechanical parts. The optical parts includes<br />ultraviolet laser source, optical filter, lenses to concentrate the beam and manhole of<br />laser beam to the tested sample in the control room. The mechanical parts include<br />the insulated chamber, dead weight, variable speed motor, sample holder,<br />temperature and pressure sensors and ph meter. Mechanism of operation depends<br />mainly on ablation process which is removal of material from the surface of a tested<br />object by vaporization. Ultraviolet laser beam is used as source of energy required<br />for ablation process. The new technique is suitable for all kinds of materials such as<br />metals, alloys polymers, ceramics and composites in any shape and size. The main<br />factors affecting the new technique are divided into: i) factors related to the laser<br />beam characteristics and ii) factors related to material properties such as surface<br />roughness, thermal conductivity, specific heat, density and mainly latent heat of<br />sublimation.https://amme.journals.ekb.eg/article_34971_d4e477f1844bba8fb8d08539cc283a11.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401THE FAILURE OF LOCAL SHARP-DENTED 6061-T6 ALUMINUM ALLOY TUBES WITH DIFFERENT DIAMETER-TO-THICKNESS RATIOS UNDER CYCLIC BENDING1173497310.21608/amme.2018.34973ENK. L.LeeProfessor, Dept. of Innovative Design and Entrepreneurship Management, Far
East University, Tainan, Taiwan.J. T.LinGraduate student, Dept. of Engineering Science, National Cheng Kung
University, Tainan, Taiwan.W. F.PanProfessor, Dept. of Engineering Science, National Cheng Kung University,
Tainan, Taiwan.Journal Article20190616ABSTRACT<br />In this study, the failure of local sharp-dented 6061-T6 aluminum alloy tubes with<br />different diameter-to-thickness ratios submitted to cyclic bending are investigated.<br />Different diameter-to-thickness ratios of 16.5, 31.0 and 60.0 were considered. The<br />dent depths of tubes were considered from very small to approximately 0.6 times the<br />tube’s wall thickness. From the experimental ovalization-curvature relationship, it<br />exhibited an increasing and ratcheting manner when the number of cycles increased.<br />The larger dent depth led to more asymmetrical ovalization-curvature relationship<br />and the greater increase of the ovalization. Furthermore, for a certain diameter-tothickness<br />ratio, five unparallel straight lines corresponding to five different dent<br />depths were found for the controlled curvature-number of cycles required to produce<br />failure relationship on a log-log scale. Finally, a theoretical model was proposed for<br />simulating the aforementioned relationship. Through comparison with the<br />experimental data, the theoretical model can properly simulate the experimental<br />findings.https://amme.journals.ekb.eg/article_34973_3ac0779cf6969aa5f8c6a328afa6d6f9.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401BEARING'S EARLY FAULT DETECTION USING VIBRATION ANALYSIS1223497410.21608/amme.2018.34974ENM. A.EissaGraduate student, Dept. of Production Eng. and Mechanical Design, Faculty of Eng.,
Menoufia Univ., Shebin El-Kom, Menoufia, Egypt.F. R.GomaaProfessor, Dept. of Production Eng. and Mechanical Design, Faculty of Eng., Menoufia
Univ., Shebin El-Kom, Menoufia, Egypt.K. M.KhaderAssociate professor, Dept. of Production Eng. and Mechanical Design, Faculty of Eng.,
Menoufia Univ., Shebin El-Kom, Menoufia, Egypt.Journal Article20190616ABSTRACT<br />Over recent decades, predictive maintenance's usage attracted the attention of<br />maintenance specialists in some important industries. Moreover, machinery condition<br />monitoring is an effective indicator for planning the maintenance schedules. Machine<br />monitoring or early detection of incipient fault is an important judgment tool of the<br />machine's health at critical parts such as; gears and bearings. Furthermore, vibrationmonitoring<br />process can be achieved by experienced operators using their visual<br />inspection. However, many specialists in maintenance field recommend using the<br />computerized inspection to meet increased demand for the automated monitoring<br />applications and helpful engineering software.<br />This paper deals with condition monitoring of machines in addition to designing<br />machine monitoring assisting tool as software for time saving. This software is<br />presented as fast tool affording instantaneous calculations of bearing fault<br />frequencies for different bearing types. In addition, the presented software can<br />instantaneously calculate the basic dynamic load rating considering bearing rating<br />life.https://amme.journals.ekb.eg/article_34974_a9b138ec9a642dac2e4a02979fb49a9d.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401STRUCTURAL DESIGN OPTIMIZATION OF A MEDIUM ALTITUDE LONG ENDURANCE (MALE) UAV WING1163497510.21608/amme.2018.34975ENS. A.AlmbrokLibyan Armed Forces.M. M.HegazeEgyptian Armed Forces.M. A.KamelEgyptian Armed Forces.M. S.AsfoorEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />The objective of this paper is to obtain an optimal weight of wing spar by obtaining<br />the optimal cross-section parameters of I-section wing spars, subjected to<br />aerodynamic and mass loads.<br />Using Matlab codes to apply several methods of optimization and then compare the<br />results of those methods. After calculating the wing weight by the classical methods,<br />optimization methods are applied to get weight minimization. Thus, the objective of<br />the optimization methods is the wing weight. Four different optimization methods are<br />used in this study. The first method is a graphical optimization method (with one<br />design parameter) used as the primary method to determine the variables range and<br />the effect of each spar on the wing weight. The second, third, and fourth optimization<br />methods (with two design parameters) are searching method, gradient-based<br />method, and genetic algorithm method respectively. The design parameter chosen<br />was the flanges ratio, due to its highly participation (20 to 50%) in the wing’s total<br />structure weight.<br />The optimization algorithms were utilized to analyze the effect of the cross-sectional<br />geometrical parameters, such as width (Z), height (W) of the flange. The ratio<br />between these parameters (Z/W) was one of the input data to the stress analysis<br />process to obtain the minimal cross-section dimensions of the flange under the<br />allowable stress of the chosen spar material. The spar is made of Aluminum 2024-T4<br />alloy.<br />The goal of the optimization is to optimize the cross section parameters of the spar to<br />withstand the exerted load subjected to the wing, yet with the minimum spar material<br />with the constraint of keeping that stress within the maximum yield stress of the<br />material. The results of applying different methods are that the searching method is<br />the best method in this case of low design variables.https://amme.journals.ekb.eg/article_34975_7ebac798647a068409a1278e813cab54.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401A NUMERICAL STUDY ON STEAM EJECTOR OPTIMUM PERFORMANCE1173497610.21608/amme.2018.34976ENT. A.GhonimLecture, Dept. of Mech. Power Engineering, Faculty of Engineering, Menoufia University,
Shebin El-Kom, Egypt.M. S.FaragLecture, Dept. of Mech. Power Engineering, Faculty of Engineering, Menoufia University,
Shebin El-Kom, Egypt.A. S.HegazyProfessor, Dept. of Mech. Power Engineering, Faculty of Engineering, Menoufia
University, Shebin El-Kom, Egypt.Journal Article20190616ABSTRACT<br />The present paper introduces a numerical study on the optimum performance of<br />steam ejector at constant pressure ratio. Both the suction and motive fluids are<br />assumed to be dry steam. As a result of the low pressure created at the exit of the<br />supersonic motive steam nozzle, a suction steam is entrained to be mixed with the<br />motive steam where both flows continue flowing towards the ejector exit. Mass ratio<br />of suction to motive flows is a vital parameter to enhance the ejector performance.<br />The objective of the present study is to maximize the steam ejector efficiency by<br />optimizing the ejector mass ratio. The effect of three different geometrical parameters<br />on ejector mass ratio and its efficiency is investigated at constant operating<br />conditions. These parameters are the ejector convergent section angle, the length of<br />the constant area mixing chamber and the ejector divergent section angle. The<br />theoretical model is formulated based on single phase (superheated steam), twodimensional<br />and compressible flow using the finite volume solver, FLUENT 6.3. In<br />addition, steady, axisymmetric horizontal ejector is considered. The realizable<br />k −e model is used to model turbulence in the present simulation. The proposed<br />numerical model is validated with the available experiments in literature. The results<br />showed that the ejector wall static pressure distributions were greatly affected by the<br />three investigated geometrical parameters. Furthermore, at constant operating<br />conditions (motive, suction and back pressures) separation in the ejector divergent<br />section started to take place at 10o at b =4.8o. In order to avoid separation, the<br />ejector divergent section angle must be selected carefully together with the operating<br />conditions. The ejector mass ratio and efficiency increased with increasing the<br />previously stated three geometrical parameters to gain there upper limit values,<br />subsequent to that, the efficiency and mass ratio decreased with increasing these<br />geometrical parameters. Moreover, it is finally concluded that there are certain<br />optimum ejector convergent, divergent angles and the length of the constant area<br />mixing chamber in order to optimize the ejector mass ratio and consequently its<br />efficiency at given constant operating condition.https://amme.journals.ekb.eg/article_34976_00aca902c1adb789233cb126101b2d6d.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EXPERIMENTAL STUDY ON GAS-SOLID MIXTURE FLOWS IN A VENTURI1123497710.21608/amme.2018.34977ENT. A.GhonimLecturer, Dept. of Mech. Power Engineering, Faculty of Engineering, Menoufia University,
Shebin El-Kom, Egypt.+Corresponding author.M.ShehaProfessor, Dept. of Mech. Power Engineering, Faculty of Engineering, Menoufia
University, Shebin El-Kom, Egypt.I. M.SakrLecturer, Dept. of Mech. Power Engineering, Faculty of Engineering, Menoufia University,
Shebin El-Kom, Egypt.W. A.El-AskaryProfessor, Dept. of Mech. Power Engineering, Faculty of Engineering, Menoufia
University, Shebin El-Kom, Egypt.Journal Article20190616ABSTRACT<br />The present paper concerns with studying experimentally the mixture of gas-solid<br />(air-coal) flows in a Venturi meter in an attempt to prepare a metering tool for<br />suspended gas-solid mixture flows. The different parameters that affect the gas-solid<br />mixture flows metering process were determined and analyzed. In order to conduct<br />the study, an experimental set-up was designed and manufactured in the laboratory<br />of the thermal power engineering in Menoufia University. Furthermore, seven<br />nonstandard (long-throated) geometrical Venturi models with different diameters<br />ratios and throat lengths were selected guided by previous literature and<br />manufactured to be used in the present experimental work. Additionally, the<br />experimental study was performed on the selected models to determine the effect of<br />different Venturi meter geometric models on pressure drop sensitivity, pressure<br />recovery, and to seek a viable method for determining loading ratio for suspended<br />gas-solid flows in the Venturi. The results showed that the coal loading ratio affected<br />greatly and positively both the pressure drop and recovery ratios of air-coal mixture<br />flows in the Venturi. However, inlet and exit geometries of the Venturi had smaller<br />effect on the pressure drop and recovery ratios than the coal loading ratio and<br />particles diameter range. Additionally, decreasing the diameters ratio and increasing<br />the throat length improved the Venturi pressure drop sensitivity to solids loading.<br />Finally, the experimental results helped greatly to analyze the different parameters<br />concerning the air-coal mixture flows in a Venturi meter and provided an insight on<br />the feasibility of using the Venturi as a metering tool for suspended gas-solid mixture<br />flows in a future continuation of the present work.https://amme.journals.ekb.eg/article_34977_991102bcf9ae4350cf88fcf8f176f2fa.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EXPERIMENTAL AND NUMERICAL INVESTIGATION OF DRAG FORCE REDUCTION OVER UNDERWATER VEHICLES1143497810.21608/amme.2018.34978ENT. A.GhonimLecturer, Dept. of Mech. Power Engineering, Faculty of Engineering, Menoufia University,
Egypt.M. S.FaragLecturer, Dept. of Mech. Power Engineering, Faculty of Engineering, Menoufia University,
Egypt.Journal Article20190616ABSTRACT<br />This paper concerns with investigating experimentally and numerically two different<br />methods of drag force reduction over underwater vehicles. The first method is the<br />viscous friction drag reduction by air injection in the near wall layer and the second<br />one is the pressure drag reduction by changing the vehicle nose profile. An<br />experimental test rig was designed and manufactured with all required<br />measurements of drag force and water velocity. Additionally, the experimental work<br />was conducted on six underwater vehicle (torpedo) models with different nose<br />profiles and lengths at variable water velocities. Computational Fluid Dynamic (CFD)<br />simulation was performed using ANSYS. Furthermore, the computations were<br />extended to depict the velocity and pressure contours around two models having<br />different body nose profiles at water velocity of 50 m/s. The total drag forces over<br />eight models were predicted and compared. The numerical results showed good<br />agreement with the experimental ones. The experimental results showed that, for<br />speed range of 1-2.5 m/s the stubbed nose profile had the highest drag. On the other<br />hand, the stepped conical nose profile had the lowest drag force. Moreover, the<br />experimental results of air injection showed a decrease in drag force in the velocity<br />range of 1.7-2.5 m/s but an increase in the drag for velocity range of 1-1.7 m/s was<br />remarked. Finally, there was a significant decrease in drag force of elliptical nose<br />model compared to other models over the velocity range of (0 to 50 m/s).https://amme.journals.ekb.eg/article_34978_6877a3f00d59f1caafb8d0e5ed5c2a32.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401THERMOPHYSICAL PROPERTIES ENHANCEMENT FOR COPPERPOLYANILINE NANOFLUID SYNTHESIZED BY GAMMA RADIOLYSIS METHOD1143498010.21608/amme.2018.34980ENS.Abdel-SamadCyclotron Facility, NRC, Atomic Energy Authority, Cairo, Egypt.+Corosponding Author: Salem M. Abdel-Samad.A.AlyanNuclear Reactors Department, NRC, Atomic Energy Authority, Egypt.A.MassoudCyclotron Facility, NRC, Atomic Energy Authority, Cairo, Egypt.S. A.WalySecond Research Reactor, NRC, Atomic Energy Authority, Egypt.Journal Article20190616ABSTRACT<br />In this study, Copper-Polyaniline nanocomposite (Cu-PAni) has been synthesized by<br />gamma radiolysis as a novel method and was confirmed by different analytical<br />techniques such as Scanning Electron Microscope (SEM), Transmission Electron<br />Microscope (TEM), X-ray powder diffraction (XRD).. The thermal conductivity of the<br />nanofluids has been measured at different nanofluids volume fractions of 0.2%,<br />0.4%, 0.6%, 0.8% and 1.0%. The effect of nanofluid temperature on the nanofluid<br />properties is measured in the range from 10oC to 90oC. The data gained discovered<br />that the copper nanoparticle completely covered by a layer of polyaniline with<br />different thickness and the particle size distributed around 21.42 nm. The thermal<br />conductivity ratio of the Copper-Polyaniline nanocomposites water nanofluid<br />increases 107% at nanofluid temperature of 10oC and 159 % at 90oC for a volume<br />fraction of 1.0%. The Cu-PAni nanocomposite can be used as a potential material for<br />thermal conductivity enhancement of water based nanofluid.https://amme.journals.ekb.eg/article_34980_a8f49c2e9a191b66298d90fcaaaae983.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401ASSESSMENT OF AIR DIFFUSION PERFORMANCE INDEX IN A SURGICAL OPERATING ROOM BY COMPUTATIONAL FLUID DYNAMICS TECHNIQUE1153498110.21608/amme.2018.34981ENA. M.AlabasiryPost graduate student, Mechanical Power Engineering Department, Faculty of
Engineering, Helwan University, Cairo, Egypt.E.ElgendyAssociate professor, Mechanical Power Engineering Department, Faculty of Engineering,
Helwan University, Cairo, Egypt.K.ElsayedAssistant professor, Mechanical Power Engineering Department, Faculty of Engineering,
Helwan University, Cairo, Egypt.M.FatouhProfessor, Mechanical Power Engineering Department, Faculty of Engineering, Helwan
University, Cairo, Egypt. Dean of Faculty.Journal Article20190616ABSTRACT<br />Surgical operating room needs an efficient ventilation system to achieve thermal<br />comfort and clean environment. This paper aims to improve the air distribution in the<br />operating rooms with two operating tables configuration. Six test cases with different<br />numbers, sizes and locations of exhaust air grills have been simulated using CFD<br />and validated with experimental measurements. The air diffusion performance index<br />(ADPI) value has been estimated for each case. The results show that the case with<br />eight exhaust air grills distributed in the four corners of the operating room gives the<br />highest ADPI (63.06%).https://amme.journals.ekb.eg/article_34981_7d0ac4ec2aeb642cf4de4d572cec6ef5.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401INVESTIGATION OF THE OPERATION OF AN ELECTROHYDRAULIC CONTROL SYSTEM OF A FLYING VEHICLE UNDER FAILURE CONDITIONS1163498210.21608/amme.2018.34982ENM. Z.FadelEgyptian Armed Forces.M. G.RabieProfessor, Nodern Academy for Engineering and Technology, Cairo, Egypt.A. M.YoussefEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />Electro-hydraulic system technology is employed in many modern control systems<br />including aircrafts and missile flight control systems. These systems used to position<br />the control surfaces of the flying vehicles with high controllability and accurate action.<br />Pilot or autopilot commands are translated into electrical position commands to the<br />electro-hydraulic control system (EHCS). This study is based upon the development<br />of a detailed nonlinear mathematical model of the EHCS and a computer simulation<br />program using MATLAB/SIMULINK package. The EHCS mainly consists of two<br />systems; main and secondary with two separate active hydraulic power supply<br />systems, used to supply the EHCS with the required power. The studied EHCS<br />incorporates two electro-hydraulic servo-valves and a smart design of built-in direct<br />operated directional control valves, controlled by electrical solenoids. The EHCS is<br />designed with smart capability to over-ride the possible problems of failure in the<br />hydraulic power supply systems or in the servo-valves. The transient response is<br />obtained by the simulation program using the solver of ode23s (stiff/Mod.<br />Rosenbrock) method. A comparison between the dynamic responses of the EHCS is<br />presented in different modes of failure. The simulation results show that this EHCS is<br />capable to provide a continued safe flight even when experiencing a certain<br />component failure or a combination of failures.https://amme.journals.ekb.eg/article_34982_5f85868700af00b1d16c2b8deadd52c6.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401PERFORMANCE OF HYDROGEN PRODUCTION PROCESS USING SOLAR ENERGY1103498310.21608/amme.2018.34983ENI. M.SakrAssist. Prof., Dept. of Mech. Power Eng., Menoufia University, Shebin El-Kom, Egypt.A. M.AbdelsalamProfessor, Dept. of Mech. Power Eng., Menoufia University, Shebin El-Kom, Egypt.W. A.El-AskaryProfessor, Dept. of Mech. Power Eng., Menoufia University, Shebin El-Kom, Egypt.Journal Article20190616ABSTRACT<br />The present experimental work is devoted to explore the efficiency of alkaline<br />water electrolysis in producing hydrogen when it is operated by solar energy. The<br />overall system efficiency is determined by measuring the solar irradiance as the<br />source of the input energy, and the amount of hydrogen produced as the source of<br />the output energy. Hence, the losses through the Photo-Voltaic (PV) cell,<br />connecting wires, and the water electrolyzer, are all considered in the present<br />study. Moreover, the effects of the gab width distance and the separators' types,<br />on the overall system efficiency are also presented. It is found that, the higher the<br />electrolyzer efficiency, the higher is the overall system efficiency at almost<br />conditions. The significant reduction in system efficiency may be due to losses of<br />the energy conversion through the PV cell and the electrical losses in the<br />connecting wires. Though, the electrolyzer efficiency reaches 90% and the<br />maximum overall system efficiency of 1.7% is barely achieved.https://amme.journals.ekb.eg/article_34983_7fcba692ff543b67b7c8ea25d7b84717.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401GROWTH CONDITIONS OF THE ALGAE SPECIES BIOMASS IN A CONTINUOUS FEEDSTOCK PHOTO BIOREACTOR BY CONTROLLING THE SOLAR THERMAL RADIATION AND CLIMATE TEMPERATURE1193498510.21608/amme.2018.34985ENE. A.El-ShenawyProf., Mechanical Power Eng. Dept., Faculty of Engineering, Tanta Univ., Tanta, Egypt.M.ElkelawyAssoc. Prof., Mech. Power Eng. Dept., Faculty of Engineering, Tanta Univ., Tanta, Egypt.H. A.BastawissiDr. Eng., Mech. Power Eng. Dept., Faculty of Engineering, Tanta Univ., Tanta, Egypt.M.TahaEng., Mechanical Power Eng. Dept., Faculty of Engineering, Tanta Univ., Tanta, Egypt.Journal Article20190616ABSTRACT<br />Algae are one of the important sources of bio-diesel. Micro algae growth rate is<br />directly affected by the sun light intensity and temperature. However, there is no<br />available data in the literature concerning the environment temperature control to<br />optimize the cultivate process of the algae in outdoor conditions. In the present study<br />the outdoor continuous feedstock photo bioreactor has been designed and built to<br />control the solar thermal radiation and its effect on the cultivation media temperature.<br />Thos have been achieved using a new Air Bubble Generation (ABG) system. The<br />used technique in the current study can enhance the temperature stability within the<br />optimum range despite of the ambient conditions temperature. The results show that<br />by increasing the air bubble generation rate the continuous photo bioreactor<br />temperature distribution was enhanced along the reactor dimension. The optimum<br />condition of the media PH is found to be 7.5, Na2CO3 concentration of 5 g, the media<br />width of 25 Cm, media height of 25 Cm and AWR (Air to Water Ratio by volume) of<br />150.https://amme.journals.ekb.eg/article_34985_c64d597240ebc94ac9b6a75cbf312bd5.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401NUMERICAL INVESTIGATION OF THE EFFECT OF DIELECTRIC BARRIER DISCHARGE ACTUATOR (DBDA) ON FILM COOLING PERFORMANCE DOWNSTREAM A CIRCULAR HOLE SCHEME OVER A GAS TURBINE VANE PRESSURE SIDE1263498710.21608/amme.2018.34987ENM.AbdelharesMechanical Power Engineering Department, Faculty of Engineering, Assiut University,
Assiut 71516, Egypt.+Corresponding Author.O.HassanMechanical Power Engineering Department, Faculty of Engineering, Assiut University,
Assiut 71516, Egypt.M. F.El-DosokyMechanical Power Engineering Department, Faculty of Engineering, Assiut University,
Assiut 71516, Egypt.M. M.AbdelghanyMechanical Power Engineering Department, Faculty of Engineering, Assiut University,
Assiut 71516, Egypt.Journal Article20190616ABSTRACT<br />This paper presents a numerical investigation of the effect of DBDA length on film<br />cooling performance downstream a circular hole scheme over a gas turbine vane<br />pressure side. The investigated scheme is that of a set of two DBDAs installed<br />downstream a cooling jet injection hole to damp the effect of the Counter Rotating<br />Vortex Pair (CRVP) accompanying the injected cooling jet. The simulation has been<br />carried out assuming one row of circular holes of a diameter D spaced at 4.5 D in the<br />cross-stream direction and inclined at 22⁰ with the vane pressure side surface. The<br />actuators are located at 0.5 D downstream the injection hole and spaced at a<br />distance = 0.25 D. Five cases of different electrode's length ranging from 1.5 D to 12<br />D have been investigated under different applied voltages in the range from 10 kV to<br />60 kV. In all those cases both the blowing and density ratios are assumed constant<br />at values equal 1 and 2, respectively. Then, the effect of changing the blowing ratio<br />on the performance has been studied for the case which exhibit optimum<br />performance where maximum surface effectiveness is achieved for specific actuator<br />length and applied voltage. The obtained results show that, for each considered<br />actuator length, the surface average effectiveness was enhanced with the increase of<br />the applied voltage to a certain limit where a maximum value was obtained, and then<br />the effectiveness decreased with the increase of the voltage. The results indicate that<br />this limit varies with the actuator length in such a way that, the longer the actuator the<br />lower the voltage at which maximum surface average effectiveness occurs.https://amme.journals.ekb.eg/article_34987_95bc00d59c610a41402cc31ea258d5c3.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401TRANSIENT AND STEADY STATE PERFORMANCE CHARACTERISTICS OF A THERMOELECTRIC GENERATOR1133498810.21608/amme.2018.34988ENA. S.El-AdlDepartment of Mechanical Engineering, Higher Technological Institute, Tenth of
Ramadan City, Egypt.M. G.MousaDepartment of Mechanical Power Engineering, Mansoura University, Mansoura,
Egypt.E. A.Abdel-HadiDepartment of Mechanical Power Engineering, Benha University, Shoubra, Egypt.A. A.HegaziDepartment of Mechanical Power Engineering, Mansoura University, Mansoura,
Egypt.Journal Article20190616ABSTRACT<br />The global energy and environmental issues are promoting the development of<br />innovative energy solutions. Thermoelectric Generators (TEGs) are regarded as a<br />promising alternative to conventional energy technologies. TEG is a device that<br />converts thermal energy directly into electric power by exploiting Seebeck effect. In<br />the present study, dynamic performance characteristics of a TEG are experimentally<br />studied under different operating conditions. The effect of input heat rate and the<br />influence of utilizing extended surfaces (fins) on both transient and steady state<br />performance of a TEG are experimentally investigated. The variation in the<br />temperature of the TEG hot and cold sides in addition to the output voltage is taken<br />as a denotation of the performance characteristics. Input heat rate of 15.0 W, 17.5 W,<br />20.0 W, 22.0W and 25.0 W are applied to the TEG hot side. Free air convection (FC)<br />is the utilized for heat dissipation from the TEG module through the cold side. From<br />the experimentation, it can be deduced that increasing the input heat rate provides<br />higher temperature difference across the module sides leading to higher power<br />output. Additionally, using fins to aid heat dissipations enhanced the TEG<br />performance by lowering the temperature of cold side and increasing the temperature<br />difference across the module. The experimental data obtained are compared with the<br />data available by the TEG module manufacturer and excellent agreement is<br />obtained.https://amme.journals.ekb.eg/article_34988_f7a85685ae292a09e3e34b6d352a0037.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MATHEMATICAL MODEL TO SIMULATE THE HEAT TRANSFER IN VITRIFIED CLAY PIPES KILN1123498910.21608/amme.2018.34989ENH. A.RefaeyMechanical Power Engineering Department, Faculty of Engineering at Shoubra,
Benha Univ., Cairo, Egypt.M. A.KaraliDepartment of Mechanical Engineering, Faculty of Engineering and Technology,
Future University in Egypt, 90 St., New Cairo, Egypt.A. G.Al-HasnawiElectromechanical Engineering, University of Technology, Baghdad, Tal
Muhammad 10066, Baghdad, Iraq.E.SpechtInstitute of Fluid Dynamics and Thermodynamics, Otto von Guericke University,
Magdeburg, Universitätsplatz 2 D-39106 Magdeburg, Germany.Journal Article20190616ABSTRACT<br />Carrying out experiments in tunnel kilns are difficult and costly. Due to the large<br />length of such kilns that sometimes reaches 180 meters. That causes the<br />production cycle takes some days. Therefore, a mathematical model is needed to<br />simulate the heat transfer process in such kilns. In this contribution, a simple shape<br />product (vitrified clay pipes) was used in the modeling, in order to simplify the<br />complexity of the process. The bvp4c code was used to solve all ordinary differential<br />equations (ODEs) of the model to obtain temperature profiles of the system using<br />Matlab. Results revealed that: the excess air number has a higher impact on the heat<br />transfer process inside the kiln. Consequently, the thermal heating of products could<br />be easily controlled, by changing the excess air values. Heat transfer coefficient<br />enhancement is a key parameter to save the energy consumption within the kiln.https://amme.journals.ekb.eg/article_34989_c4d2a70e1e6768b01155253397fc0cd9.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401COMPUTATIONAL FLUID DYNAMICS AND COMBUSTION MODELLING113499010.21608/amme.2018.34990ENS. S.IbrahimAssist. Prof., Department of Aeronautical and Automotive Engineering,
Loughborough University, Loughborough LE11 3TU, UK.Journal Article20190616ABSTRACT<br />This lecture describes recent numerical and experimental studies of Computational<br />Fluid Dynamics (CFD) and combustion in practical applications. The studies have<br />been performed in a range of laboratory platforms where controlled flow and<br />combustion take place. The lecture will cover a wide range of practical industrial<br />applications including burners’ swirl flames, premixed and non-premixed combustion,<br />internal combustion engines, fuel cells, hydrogen utilization and applications, dust<br />and hydrogen safety studies.<br />The numerical approaches used in the above studies range from simple ones that<br />are numerically feasible for practical applications such as those based on Reynolds<br />Averaged Navier-Stokes (RANS) equations to complex and numerically very<br />expensive such as Large Eddy Simulation (LES) methods. Experimentally, high<br />speed images of flow and combustion processes as well pressure-time traces are<br />widely available for a range of experimental conditions but flow field measurements<br />are less common due to the seeding difficulty associated with such transient<br />processes. This lecture will also review recent experiments where the flame front was<br />imaged using Laser Induced Fluorescence (LIF) from the hydroxyl radical of the<br />combustion process.https://amme.journals.ekb.eg/article_34990_cfea2a6b80956b81aca6cedb9fbed368.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401INVESTIGATION OF THE INFLUENCE OF FLUIDICS INSERTION TECHNIQUE ON ARGON GAS ADDITIVES TO LPG ON THE TURBULENT LEAN PREMIXED FLAME CHARACTERISTICS FOR EV BURNER1203499110.21608/amme.2018.34991ENS.HassanEgyptian Armed Forces and M. Sc. Student, Mechanical Power Eng. Dept., Faculty of
Engineering, El-Azhar University, Cairo, Egypt.M.ElkadyProfessor, Mechanical Power Eng. Dept., Faculty of Engineering, El-Azhar University,
Cairo, Egypt.H.MoneibProfessor, Mechanical Power Eng. Dept., Faculty of Engineering-Mataria, Helwan
University, Cairo, Egypt.A.OmerEgyptian Armed Forces.A.EmaraLecturer, Mechanical Power Eng. Dept., Faculty of Engineering-Mataria, Helwan
University, Cairo, Egypt.A.AttiaEgyptian Armed Forces.A.AbdulnaimAssist. Lecturer, Mechanical Power Eng. Dept., Faculty of Engineering-Mataria, Helwan
Univ., Cairo, Egypt.Journal Article20190616ABSTRACT<br />A series of experiments were done on a vertical EV burner with a constant coflow air<br />of 873 L /min in order to investigate the impact of fluidics insertion technique on the<br />temperature field and flame structure. The flow rates of fuel (LPG/ Ar) and air were<br />measured using calibrated rotameters. The different volume ratios of the fuel<br />constituents were admitted via three solenoid valves at the entry section of each<br />stream prior to mixing and monitored using a lab view program. The axial<br />temperature profiles at different operating conditions were measured using a bare<br />(type S) thermocouple. Flame images were obtained, before and after fluidics<br />insertion using a high resolution digital camera. The experimental program aims at<br />identifying and analyzing the changes in flame characteristics (flame length, axial<br />profiles of mean gas temperature, NOx concentration and overall combustion<br />efficiency) resulting from the insertion of fluidics while considering different<br />proportions of the fuel constituents. The results obtained indicate the following: it was<br />noticed that in most cases of pure LPG only, and other mixtures of argon the images<br />shows increase in both the length and luminosity of the flame as a result of higher<br />degrees of swirl due to the fluidics insertion while the temperature profiles of the<br />different flames were changed. It was indicated that NOx trend was decreased by<br />50% while the combustion efficiency was improved by 2.5%.https://amme.journals.ekb.eg/article_34991_1c5640c1e47a48f002b07a901b01921c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401INFLUENCE OF ACETONE AS OXYGENATOR ADDITIVE ON THE COMBUSTION, PERFORMANCE, AND EMISSION OF DIESELBIODIESEL BLENDS IN DIRECT INJECTION DIESEL ENGINE1133499310.21608/amme.2018.34993ENA.KabeelProfessor, Dept. of Mechanical Power Engineering, Faculty of Engineering, Tanta
University, Tanta, Egypt.E. A.El ShenawyProfessor, Dept. of Mechanical Power Engineering, Faculty of Engineering, Tanta
University, Tanta, Egypt.M.ElkelawyAssoc. Prof., Dept. of Mechanical Power Engineering, Faculty of Engineering, Tanta
University, Tanta, Egypt.H. A.BastawissiLecturer, Dept. of Mechanical Power Engineering, Faculty of Engineering, Tanta
University, Tanta, Egypt.A.ElbannaEng. And Demonstrator, Dept. of Mechanical Power Engineering, Faculty of Engineering,
Tanta University, Tanta, Egypt.Journal Article20190616ABSTRACT<br />Diesel fuel additives are chemicals which are added to the vehicles fuel to improve<br />engine performance, combustion properties, and emission characteristics. In this<br />paper, the experimental investigations of the effect of diesel-biodiesel-acetone<br />emulsion fuels on the performance and emissions of a direct injection diesel engine<br />have been reported. The tests were conducted on one-cylinder naturally aspirated<br />compression ignition engine operated at 1600 rpm. Measured characteristics were<br />torque, power, brake thermal efficiency, specific fuel consumption, exhaust gas<br />temperature, and exhaust gases of CO, CO2, unburned hydrocarbons (UHC), NO,<br />and O2.The obtained results show that the torque, power, and Break Thermal Energy<br />were increased when we compare the engine operation with pure diesel fuel.<br />Additionally, the specific fuel consumption and engine exhaust gas temperature were<br />reduced. The CO, UHC, and soot emissions were decreased. However, the NO<br />emission was increased.https://amme.journals.ekb.eg/article_34993_ca66c9ff6b5216e9d599fb80908fa9b6.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EXPERIMENTAL INVESTIGATION OF THE EFFECT OF NUMBER OF LAYERS AND FLOW ARRANGEMENT ON THE PERFORMANCE OF A MICROCHANNEL HEAT SINK SYSTEM1133499410.21608/amme.2018.34994ENH.Abdel AtyMechanical Engineering Department, Assiut University, Assiut 71516, Egypt.+Corresponding Author.O.HassanMechanical Engineering Department, Assiut University, Assiut 71516, Egypt.M.AbdelgawadMechanical Engineering Department, Assiut University, Assiut 71516, Egypt.N. Y.Abdel-ShafiMechanical Engineering Department, Assiut University, Assiut 71516, Egypt.Journal Article20190616ABSTRACT<br />This paper presents experimental investigation of the effect of number of layers as<br />well as the flow arrangement on the performance of a microchannel heat sink system<br />(MCHS). The effect of flow rate on pressure drop, temperature uniformity, and outlet<br />temperature in single and double layers MCHS under the effect of uniform heat flux<br />condition was investigated. The MCHS used had micro channels with rectangular<br />cross section. The heat flux applied during the experiments was varied from 5.0 to<br />13.68 W/cm2. The results of single layer MCHS were compared with theoretical<br />predictions in order to validate the results of the present test rig. From the obtained<br />results it was observable that the outlet temperature was highly dependent on the<br />mass flow rate until a certain value after which change in the outlet temperature was<br />minor. On the other hand, the pressure drop increased almost linearly with the<br />increase in mass flow rate due to laminar nature of the flow. When multilayer<br />systems were tested, the main observation was a significant reduction in the<br />pressure drop compared to the single layer case for the same mass flow rate.<br />Moreover, flow arrangement was found to have an impact on pressure drop which<br />was smaller in the case of counter flow arrangement compared to parallel flow<br />arrangement case. Flow configuration (parallel, counter, or cross-flow) had a<br />significant effect on temperature uniformity over the heat sink area with counter-flow<br />arrangement giving best temperature uniformity followed by the cross-flow<br />arrangement. Change in the outlet temperature in the case of multilayer and single<br />layer systems was not significate which may be due to the fact that the same mass<br />flow rate was applied to all tested cases.https://amme.journals.ekb.eg/article_34994_bfba3965c1b1058f5fd416af0067f2a6.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401THERMAL ANALYSIS OF THE ISCC POWER PLANT IN KURAYMAT, EGYPT1153499510.21608/amme.2018.34995ENA.TemrazEgyptian Armed Forces. Corresponding author.A.RashadEgyptian Armed Forces.A.ElweteedyEgyptian Armed Forces.K.ElshazlyProfessor, Department of Mechanical Power Engineering, Faculty of Engineering-
Shoubra, Benha University, Egypt.Journal Article20190616ABSTRACT<br />Integrated Solar Combined-Cycle (ISCC) technology combines the benefits of solar<br />energy with the benefits of a combined cycle. The solar resource partially substitutes<br />the fossil fuel. In this paper, a thermodynamic exergy analysis of the integrated solar<br />combined cycle power plant in Egypt was implemented. The data is taken from the<br />design documentations of the plant as well as the plant records. Exergy-based<br />performance analysis based on the second law of thermodynamics overcomes the<br />limit of studying the system based on the first law of thermodynamics. It assesses the<br />magnitude of exergy destruction in each part of the system. The plant is a 135 MWe<br />hybrid power plant composed of a combined cycle and a 20 MWe solar thermal plant.<br />Exergy destruction throughout the plant is quantified and illustrated using an exergy<br />flow diagram. The exergitic efficiency of each component of the ISCC is calculated.<br />The results showed that the overall thermal efficiency and the 2nd law efficiency of the<br />ISCC accounted for 32% and 40.8%, respectively. Also, it was revealed that the<br />combustion chamber and the solar field represent the sites of the highest exergy<br />destruction in the ISCC (34 % and 42.1% respectively). The sources of the exergy<br />destruction in the combustion chamber and the solar field are discussed in order to<br />identify the possibility to enhance the performance of the components of major<br />exergy destruction.https://amme.journals.ekb.eg/article_34995_67dba86925673b53d85d9587bb26a8de.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401THE CROATIAN MODEL OF INNOVATIVE SMART ENTERPRISE FOR DIFFERENT SIZES OF ENTERPRISE1143499610.21608/amme.2018.34996ENI.VezaFull professor, Ph.D., Dept. of Mechanical Engineering Technology, University of
Split, Split, Croatia.M.CrnjacTeaching/research assistant, Ph.D. student, Dept. of Mechanical Engineering
Technology, University of Split, Split, Croatia.M.MladineoTeaching/research assistant, Ph.D., Dept. of Mechanical Engineering
Technology, University of Split, Croatia.Journal Article20190616ABSTRACT<br />This paper deals with the issue about models that will help Croatian companies to<br />bridge the gap between their current situation and that of the developed companies.<br />The paper presents research within the project Innovative Smart Enterprise.<br />The aim of project Innovative Smart Enterprise is to understand current state of<br />manufacturing enterprises in Croatia and to help them find a new path for<br />improvement. The focus is on new manufacturing technologies, integration of ICT<br />(Information and communication technologies) within processes and new<br />organizational concepts in production related to Industry 4.0.<br />Previous research was done to describe the current state of Croatian manufacturing<br />companies and an analysis was made to find out which basic lean methods Croatian<br />companies should acquire and use. A selection of six basic lean methods was made<br />and the foundation of generic HR-ISE (Croatian model of innovative smart enterprise)<br />model was defined. This paper presents models based on the generic HR-ISE<br />model. The data for research were collected from small, medium and large<br />companies through surveys. This research shows that surveyed companies in<br />Croatia are aware that they need new model for production system in order to stay<br />competitive. Through this research Croatian manufacturing companies have picture<br />of the current state and guidelines for improvement.https://amme.journals.ekb.eg/article_34996_11ed4bd537135288df5f25089c1147e2.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EARTH OBSERVATION SATELLITES OPTIMIZATION; SURVEY AND ANALYSIS1283499710.21608/amme.2018.34997ENA. M.AbbasEgyptian Armed Forces.K. T.MeselheyEgyptian Armed Forces.W. S.MoghethEgyptian Armed Forces.A. A.OmerEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />The problem of earth observation satellites planning and scheduling contains many<br />objectives and constraints. The objectives include downloaded data, profit of<br />scheduled tasks and quality (weight) values. The constraints are related to energy,<br />data, targets (tasks) and ground stations. Many optimization methods have been<br />used to optimize this problem such as dynamic programming (DP), simulated<br />annealing (SA), ant colony optimization (ACO), genetic algorithm (GA) and constraint<br />programming approach (CPA). Each reported research used a harmonized<br />combination of objective(s), constrains, and optimization techniques. The presented<br />work investigates the anatomy of this optimization problem. It is also analyzes the<br />findings of the previous relation between the optimization problem elements and<br />gaps in past research. Furthermore shows that there is a gap between data’s<br />objectives (maximizing the total amount of downloaded data) and the targets’<br />constraints (observation of tasks, scheduling and consecutive observation).The most<br />widely used optimization methods are dynamic programming and heuristic<br />algorithms, respectively. Moreover, the most widely objectives are those relative to<br />profit. Few discussions are also presented concerning the constraints which involve<br />data rate, range of ground stations and capacity of ground stations.https://amme.journals.ekb.eg/article_34997_22efca92a5f8f71ebf535647cda95015.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401PRODUCTIVITY ENHANCEMENT THROUGH LEAN IMPLEMENTATION – A CASE STUDY1143499810.21608/amme.2018.34998ENS. A.SalahDr., Dpt. of Industrial System Engineering, October University for Modern Science and
Arts, Cairo, Egypt.N.SobhiProfessor Dr., Dean of Faculty of Engineering, October University for Modern Science
and Arts, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Many organizations are nowadays interested in adopting lean manufacturing strategy<br />that would enable them to compete in this globalization market. Lean production<br />philosophy striving for elimination of all kind of waste, which is becomes the main<br />target in industrial companies, as well as in food industrial organizations. Decreasing<br />the process time and identifying all types of defects in the production line are critical<br />in improving the productivity, especially in mass production companies. The<br />objectives of this paper are implementing the lean production tools in a mass<br />production company for food industry to reduce the major kinds of waste and<br />increase the productivity of the company. This paper is focusing on collecting<br />qualitative data about the major kinds of waste in the production line, and analyzing<br />those data to find the root causes of the major wastes in all processes in the<br />production line and trying to eliminate them in order to improve the productivity. The<br />achieved results indicate that implementation of some lean tools in the company with<br />the available resources without additional cost such as; routine maintenance,<br />correction, adjustment and repair has a great impact on increasing machines<br />availability, the total productivity and the net profit in the company.https://amme.journals.ekb.eg/article_34998_8852aca1e8baad4a0cf5d0a75dc08f23.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401RELIABILITY IMPROVEMENT OF LOW EARTH ORBIT MICRO SATELLITE1153499910.21608/amme.2018.34999ENR. E.El BadwayPh.D. Candidate, Dept. of Mechanical Engineering, AL-Azhar University, Cairo, Egypt.A. M.ElhadyAdjunct Prof. NexSat Project Manager, NARSS, Cairo, Egypt.A. A.EL-BadawyProfessor, Dept. Mechatronics, German University in Cairo (GUC), Cairo, Egypt and
Dept. of Mechanical Engineering, AL-Azhar University, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Satellite mass and reliability are two contradicting parameters affecting the satellite<br />cost. To get a cost effective satellite, it would be necessary to compromise between<br />low mass and high reliability. This challenge attracts the interest of many space<br />institutions. This study presents an iterative simple technique to calculate and<br />improve satellite reliability with low redundancy for the benefits of low mass. The<br />failure contribution factor plays a strong role in the identification of the weak path<br />which leads to system failure and propose the candidate component(s) to be<br />duplicated. The present technique presents the failure contribution percentage of<br />each component to satellite system failure and order them based on severity.<br />Depending on the results the designer has to decide continue redundant or stop the<br />process of improvement. The proposed technique had applied to a case study as a<br />proof of concept. The work result shows how the proposed technique is simple and<br />highly effective. More investigation will be applied to a real satellite project in the<br />nearest future.https://amme.journals.ekb.eg/article_34999_0cb72f5d41c84315b06e5cf011f1de7c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401APPLICATION OF SINGLE MINUTE EXCHANGE OF DIE ON MASS PRODUCTION COMPANY1143500010.21608/amme.2018.35000ENS. A.SalahDr., Dept. of Industrial System Engineering, October University for Modern Science and
Arts, Cairo, Egypt.N.SobhiProfessor Dr., Dean of Faculty of Engineering, October University for Modern Science
and Arts, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Lean manufacturing philosophy is continually strive to eliminate the nun-value added<br />activities, minimize the delivery cycle time and improve the quality of products. Most<br />manufacturing companies adopt lean in order to meet customer expectations and<br />become more competitive in the market. Implementation of Lean enterprise is an<br />efficient and effective way to reduce the cost of the enterprise without incurring high<br />capital expenditures. SMED is a popular lean tool used for dramatically reducing the<br />set-up time for the machine, which is a set of techniques enabling for the<br />replacement of tooling or set a production line in less time than 10 minutes. This<br />paper focuses on implementing SMED methodology in a mass production company<br />for food industries in order to reduce changeover time. The objectives of this paper<br />are decreasing the setup times of the production line to enable the production<br />flexibility and increase the maneuverability between different products according to<br />customer needs. This paper monitoring carefully all production processes to identify<br />all wasted time between processes and find ways to eliminate or decrease it. The<br />achieved results indicate that implementation of SMED in the company has a<br />significant impact on decreasing the setup times and increasing the total productivity<br />and the net profit. The changeover time reduced by 25%, and the OEE increased<br />from 48% to 70%, also, the sales opportunities increased by 465,600 EGP per year.https://amme.journals.ekb.eg/article_35000_14a2a70c3372d91ad278330ad05731f2.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401OPTIMIZATION OF THE NC PROGRAM USING NC BRAIN SOFTWARE113500210.21608/amme.2018.35002ENAdrianBUTAssoc. Professor, Department of Materials and Manufacturing Engineering, Mechanical
Faculty, POLITEHNICA University of Timisoara, ROMANIA.Journal Article20190616ABSTRACT<br />The lecture presents solutions to optimize the NC program. When we doing NC<br />machining, we meet lots of challenges like; these are: i) How to increase more profit?<br />ii) Is there any way to do safest and fastest machining? iii) Is there any way to make<br />top-notch standard technology?<br />The lecture will answer these questions. Using the original NC program and keeping<br />the technology with the same cutting tools, the results give us less time of<br />manufacturing with more protection to collisions using NC BRAIN software.https://amme.journals.ekb.eg/article_35002_8c9d852dd9cf4f7b7e48aef6b02a2d5b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EFFECT OF TOLERANCES OF SMALL SIZE SLIDER-CRANK MECHANISM ON POSITION ERRORS AND UNCERTAINTY1133500310.21608/amme.2018.35003ENE.RashedAssistant lecturer, Production Engineering Dept., Faculty of Engineering, Alexandria
University, Alexandria, Egypt.M.DamirProfessors, Production Engineering Dept., Faculty of Engineering, Alexandria University,
Alex., Egypt.A.ElkhatibProfessors, Production Engineering Dept., Faculty of Engineering, Alexandria University,
Alex., Egypt.Journal Article20190616ABSTRACT<br />Small size slider-crank mechanisms are used in many accurate and precise<br />sophisticated applications. The design parameters of the mechanism play an<br />important role in defining its performance characteristics. The input-output relations<br />are the main criteria to define its characteristics and hence its capabilities to achieve<br />specific application requirement. The tolerance analysis for mechanism components<br />are a key element for studying and improving mechanism characteristics and its<br />transmission quality. In this paper kinematics models for small size slider-crank<br />mechanism are presented. The models consider the mechanism characteristic range,<br />sensitivity and input-output relations. The effect of mechanism manufacturing and<br />assembly errors such as; components tolerances, joints clearances and assembly<br />deviations were investigated. The study elaborates the effect of these errors on the<br />mechanism characteristic and position uncertainty. A contact approach model is<br />introduced analyzing the effect of joints clearances on mechanism hysteresis error,<br />position uncertainty, and dead zones. The study is further condensed to define the<br />most appropriate design parameters needed for different applications.https://amme.journals.ekb.eg/article_35003_6b847ea880d0d5c256ce96d3d6944520.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401ANALYSIS OF CUTTING FORCES IN MICRO MILLING1183500410.21608/amme.2018.35004ENS.MekhielEgyptian Armed Forces.A.YoussefEgyptian Armed Forces.Y.ElshaerEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />In metal cutting, the prediction of cutting forces has been the focus of research for<br />very long time. The reason for that is to decrease the cost of performing experimental<br />work whenever the cutting of new material is needed. In recent years a new<br />application for metal cutting was introduced due to the miniaturization of components<br />and the invention of micro electro-mechanical system MEMS. This has led to the<br />introduction of micro machining. Thus the analysis of the cutting system needed<br />revisions. This is because of the domination of other factors during cutting process.<br />Among these factors are the minimum chip thickness and the ploughing forces. In<br />this work the modeling of orthogonal, oblique and milling cutting process in micro<br />scale is presented. The results are verified using published experimental results.https://amme.journals.ekb.eg/article_35004_1f20f523c03f618cf54e7d497c703e6e.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MODELING OF CO2 LASER CUTTING PARAMETERS FOR STAINLESS STEEL 316 USING ARTIFICIAL NEURAL NETWORK TECHNIQUE1103500510.21608/amme.2018.35005ENA. M.El-WardanyAssistant Lecturer, Modern Academy for Engineering and Tech., Cairo, Egypt.M. A.MahdyDean of Higher Institute for Engineering and Modern Technology Marg, Egypt.H. A.SonbolProfessor, Design and Prod. Engineering Department, Faculty of Engineering, Ain Shams
University, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Artificial neural networks (ANNs) became one of the most important artificial<br />intelligent tools that have found extensive application in solving many complicated<br />real-world problems. This research presents a new predictive model of CO2 laser<br />cutting of stainless steel 316 using ANN. The aim of this research is to develop an<br />(ANN) model capable to predict the laser cutting process output parameters for<br />certain input variables. The laser beam was used to cut 2mm thickness of stainless<br />steel 316 sheet. The input parameters for the neural network are: laser power (P),<br />traverse speed (v), assisted gas pressure(p) and focal plane position (F). The outputs<br />of the neural network model are three most important performance parameters<br />namely: upper kerf width (UKW), lower kerf width (LKW), and the average surface<br />roughness (Ra). The model is based on multilayer feed-forward neural network. The<br />experimentally acquired data is used to train, validate and test the neural network's<br />performance, and special graphs were drawn for this purpose. Finally, this research<br />work would provide a new model based on ANN technique to predict the cutting-edge<br />quality parameters.https://amme.journals.ekb.eg/article_35005_6da91e65652fdf6fbd6e66471a42df9a.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401AN INVESTIGATION INTO THE EFFECT OF CO2 LASER CUTTING VARIABLES ON CUTTING EDGE QUALITY OF STAINLESS STEEL 316 SHEETS1123500610.21608/amme.2018.35006ENA. M.El-WardanyAssist. Lecturer, Modern Academy for Engineering and Tech., Cairo, Egypt.H. A.SonbolProfessor, Design and Prod. Eng. Dept., Faculty of Engineering, Ain Shams University,
Cairo, Egypt.M. A.MahdyProfessor, Dean of Higher Institute for Engineering and Modern Technology Marg, Egypt.Journal Article20190616ABSTRACT<br />Laser beam cutting is one of the major applications of lasers in sheet metal working.<br />In this investigation, an experimental study in CO2 laser cutting process is presented.<br />The aim of this research is to investigate the effect of the laser cutting process<br />variables on the cutting-edge quality parameters. A sheet of stainless steel with a<br />standard grade of 316, 2 mm thickness was chosen as a workpiece material. Several<br />experiments were conducted to investigate the influence of four input variables: laser<br />power (P), traverse speed (v), assist gas pressure (p) and focal plane position (F) on<br />the three most important performance parameters, namely: upper kerf width (UKW),<br />lower kerf width (LKW), and the average surface roughness (Ra). Minitab software<br />was used to determine the main effects of the process variables on the performance<br />parameters. Signal to noise ratio analysis (SN) was used to determine the optimum<br />process variables in their operating rage. This investigation would provide a good<br />demonstration for the most significant input variables on the cutting-edge quality<br />parameters, which will be used for solving related industrial problems.https://amme.journals.ekb.eg/article_35006_b2b39852a3677dd6c2542c7ea679616d.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401DESIGN OF A COMBINED TUBE FEEDING AND CUTTING MECHANISM USING DESIGN FOR SIX SIGMA APPROACH1163500710.21608/amme.2018.35007ENK. M.KhaderAssociate Professor, Production Engineering and Mechanical Design Department, Faculty of
Engineering, Menofia University, Shebin El-Kom, Egypt.O. A.NadaAssistant Professor, Production Engineering and Mechanical Design Department, Faculty of
Engineering, Menofia University, Shebin El-Kom, Egypt.E-A.AttiaAssistant professor, Mechanical Engineering Department, Faculty of Engineering (Shoubra), Benha
University, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Design for Six Sigma (DFSS) is a proactive approach that aims at designing in<br />quality during the early stages of product or process development. In this paper, the<br />DMADV (Define-Measure-Analyze-Design-Verify) methodology has been applied to<br />an industrial process. The considered application involves cutting tubes to<br />predefined lengths in order to be supplied to custom-made automotive exhaust tube<br />manufacturers. Investigating the process reveals several problems that adversely<br />affect the production. Accordingly, customer requirements have been identified and<br />the Quality Function Deployment (QFD) has been implemented to translate these<br />requirements into technical characteristics. A conceptual design of a compound<br />mechanism for both feeding and cutting has been suggested to overcome the<br />drawbacks in the current practice. A detailed 3D CAD model has been developed, in<br />addition to a prototype that has been manufactured to test the validity of the<br />proposed design. Pilot runs of the prototype reveal that the developed mechanism<br />not only performs its intended task adequately, but also the chances of cutting wrong<br />tube lengths have been eliminated.https://amme.journals.ekb.eg/article_35007_2aaaefbbb8ce9793ec648e9116170da7.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401IDENTIFICATION OF CRITICAL SUCCESS FACTORS FOR TOTAL PRODUCTIVE MAINTENANCE1143500810.21608/amme.2018.35008ENS. N.SeleemRefrigerators Plant Manager, Elaraby Group for industrial engineering 3rd Industrial zone,
Quesna, Egypt.El-AwadyAttiaAssistant Professor, Mechanical engineering department, Shoubra faculty of engineering,
Benha University, Egypt.A.El-AssalProfessor of mechanical engineering, Mechanical engineering department, Benha faculty of
engineering, Benha University, Benha, Egypt.Journal Article20190616ABSTRACT<br />To remain competitive in the current working environment, firms focus on adopting<br />performance improvement approaches that support in satisfying their customer<br />needs and reducing their production expenses. Total Productive Maintenance (TPM)<br />is considered as one of the most important programs that enhance the overall<br />internal process; hence, significant operational results can be easily achieved. On the<br />other side, it is crucial to sustain such results over time. To gain such sustainability,<br />companies need to identify the critical success factors for the implementation of TPM<br />programs. Moreover, they need to introduce and implement actions that support<br />these critical success factors as a foundation before establishing a TPM program. In<br />this paper, Decision Making Trial and Evaluation Laboratory (DEMATEL) method<br />used to identify such critical success factors. The proposed approach applied in an<br />Egyptian factory that is dedicated to produce a set of plastic parts. After applying the<br />proposed approach, it concluded that “Cross-functional team work”, “Setting<br />organization objectives”, “Providing on-job training” and “Availability of information”<br />are the most critical factors. After working on such factors and starting the TPM<br />program, key performance indicators such as the overall equipment effectiveness<br />(OEE) improved from 60.0% to 73.1% in a period of 15 months.https://amme.journals.ekb.eg/article_35008_7a035e393abd82edb1fa6f3fb192346f.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MULTIVARIATE PROCESS CAPABILITY ASSESSMENT AND IMPROVEMENT: A CASE STUDY1153501010.21608/amme.2018.35010ENM. H.Abo-HawaDemonstrator, Department of Production Engineering and Mechanical Design,
Faculty of Engineering, Menoufia University, Shebin El-Kom, Menoufia, Egypt.M. A.Sharaf El-DinAssoc. Professor, Department of Production Engineering and Mechanical Design,
Faculty of Engineering, Menoufia University, Shebin El-Kom, Menoufia, Egypt.O. A.NadaAssist. Professor, Department of Production Engineering and Mechanical Design,
Faculty of Engineering, Menoufia University, Shebin El-Kom, Menoufia, Egypt.Journal Article20190616ABSTRACT<br />In today’s competitive manufacturing environment, the challenge is to responsively<br />produce products with minimum cost and high quality. Achieving and controlling the<br />targeted quality level in manufacturing processes does not only increase customer<br />satisfaction, but it can also result in significant cost and time savings. Further,<br />measuring the process performance is a critical issue in process improvement<br />initiatives. The common practice in several industries is using the Univariate Process<br />Capability Indices (UPCIs) to measure the process performance, which are based on<br />only a single quality characteristic. In most of the applications, it is not acceptable to<br />judge the performance based on a single quality characteristic as it actually relies on<br />more than one characteristic. In this paper, univariate and multivariate PCIs are used<br />to measure the performance of the flare making process. This process is a critical<br />step in the straight fluorescent light bulb production line. In addition, multivariate<br />control charts such as the Hotelling as well as the Multivariate Exponentially<br />Weighted Moving Average (MEWMA) are constructed for the collected data to verify<br />that the process is in control before assessing its capability. Besides, Principal<br />Component Analysis (PCA) and Joint Normal Distribution (JND) techniques are<br />applied in the multivariate process capability assessment. In this paper, Multivariate<br />Process Capability Indices (MPCIs) have been evaluated to compare the process<br />performance before and after improvement efforts. In the considered case study,<br />MPCIs provide the user with an overall assessment of process capability regardless<br />of the fluctuations in the individual variables capabilities.https://amme.journals.ekb.eg/article_35010_0ec8c40b834a39547d9a41079c656f1b.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401SURFACE ROUGHNESS JUSTIFICATION IN ADDITIVE MANUFACTURING1113501110.21608/amme.2018.35011ENM.HamoudAssistant Professor, Faculty of Engineering, Helwan University, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Recently, developing Additive Manufacturing (AM) technologies have been<br />increased, because its advantages toward the rapid manufacturing of physical model<br />from the CAD system. In the AM area, the designer specifies the desired surface<br />quality on the working drawing to be considered during the building operation. The<br />produced surface depends on the building parameters. The aim of this work is to<br />develop new empirical models for predicting the building orientation that satisfy<br />required surface roughness based on FDM m/c. In this study, a new 3D CAD<br />specimen was proposed to decrease the number of experiments, measuring errors<br />and building cost. The specimen contains the surface orientation from 0o to 90o with<br />step 10o that was built three times at three different layer thickness (0.1, 0.3, and<br />0.4mm). The order of the model was determined by the test of all orientations accept<br />at 30o and 60o that was used for model verification. Results show the three prediction<br />models at certain three values of layer thicknesses. The prediction of building<br />orientation has several benefits as follows; it is very useful information for the<br />designer before exporting STL file, the AM users can choose the process parameters<br />without extra trails, increase the opportunity of technology to shear in Rapid<br />Manufacturing (RM), Rapid Tooling (RT), and in medical applications.https://amme.journals.ekb.eg/article_35011_b321fc16c334b8ba5ddf73aa1e4172c6.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401ENHANCEMENT OF SLICED LAYER CONTOUR FOR RECONSTRUCTING A 3D MODEL USING SOLID FREEFORM FABRICATION1133501210.21608/amme.2018.35012ENM.HamoudAssistant Professor, Faculty of Engineering, Helwan University, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Nowadays, Solid Freeform Fabrication (SFF) takes a great attention by creating<br />complex solid objects directly from geometric models without specific tooling<br />information. SFF also referred to layered manufacturing (LM) which builds up 3D<br />objects by successive 2D layer deposition after exporting it as an STL file format from<br />its CAD environment.<br />This paper aims at overcoming the approximation problem of 2D layer contour from<br />sliced STL model. The author used a Lagrange interpolation method to increase the<br />point’s coordinates of the sliced layer contour in order to reconstruct an accurate and<br />near net contour of the original sliced CAD model. This method reduced the error<br />between the original sliced CAD model and the actual reconstructed layer contours to<br />0.006%.https://amme.journals.ekb.eg/article_35012_edd3ffe59db6d03b6732aef291747973.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401PREDICTION OF ABRASIVE WATER JET CUTTING PARAMETERS USING ARTIFICIAL NEURAL NETWORK1143501310.21608/amme.2018.35013ENY. M.ElattarAssistant Lecturer, Modern Academy for Engineering and Tech., Cairo, Egypt.M. A.MahdyDean of Higher Institute for Engineering and Modern Technology Marg, Cairo, Egypt.H. A.SonbolProfessor, Design and Prod. Eng. Dept., Faculty of Engineering, Ain Shams University,
Cairo, Egypt.Journal Article20190616ABSTRACT<br />This work presents a new predictive model of abrasive water-jet (AWJ) machining of<br />ARMOX shielding steel plate of 7.6 mm thick. The model was developed to predict<br />some interesting process parameters from process variables. As AWJ is a<br />complicated multi input multi output machining process. The model is developed<br />using artificial neural network (ANN). A feed forward neural network based on back<br />propagation was made up of 4 input neurons, 1 hidden layer with 10 hidden neurons<br />and 2 output neurons. The ANN training set was generated by extensive<br />experimental work. The tests considered four process variables. The studied AWJ<br />process variables are traverse speed (T), waterjet pressure (P), standoff distance (s),<br />and abrasive flow rate (ma). The considered process parameters are surface<br />roughness (Ra) and material removal rate (MRR). The ANN model was trained and<br />tested. The ANN succeeded to model the AWJ process by extracting the process<br />parameters from process variables with a regression factor above 90%. This paper is<br />a step forward to model and control the AWJ machining process.https://amme.journals.ekb.eg/article_35013_0ec333e5686002875d7557671df8b506.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EVALUATION OF ABRASIVE WATER JET MACHINING PROCESS PARAMETERS ON CUTTING HIGH STRENGTH HARD MATERIAL (ARMOX)1123501410.21608/amme.2018.35014ENY. M.ElattarAssist. Lecturer, Modern Academy for Engineering and Tech., Cairo, Egypt.H. A.SonbolProfessor, Design and Prod. Eng. Dpt., Ain Shams University, Cairo, Egypt.M. A.MahdyDean of Higher Institute for Engineering and Modern Technology Marg, Egypt.Journal Article20190616ABSTRACT<br />This paper is dedicated to investigate the abrasive water-jet (AWJ) cutting<br />parameters of hard-to-cut materials represented by Armox shielding steel plate of 7.6<br />mm thick. Experiments were carried out in machining Armox in order to investigate<br />the possibility of using the AWJ process for machining process. Process variables<br />such as water jet travers speed, water jet pressure, stand-off distance, and abrasive<br />flow rate have been investigated to study the effect of each on the AWJ cutting<br />process parameters. Cutting parameters such as the profiles of machined surfaces,<br />kerf geometries and material removal rate were investigated.<br />The experimental results indicate that the traverse speed is a significant parameter<br />on the surface roughness. It was also observed that the kerf taper ratio and surface<br />roughness increase with increasing traverse speed in chosen conditions. Moreover, it<br />shows that surface roughness, and the material removal rate are widely affected by<br />the abrasive flow rate. The increase of abrasive flow rate yields the material removal<br />rate but decreases the surface roughness. Stand-off distance and jet pressure almost<br />had no effect on both surface roughness and material removal rate.https://amme.journals.ekb.eg/article_35014_8d6963cf51aaba3513d73f73f7cf39c4.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401DESIGN OF AN AUTONOMOUS ROBOT OPERATING IN DIFFERENT ENVIRONMENTS1213501510.21608/amme.2018.35015ENM. M. H.AlsherifM. Sc. researcher, Dept. of Mechatronics Engineering, Faculty of Engineering
Helwan University, Cairo, Egypt.A. F.BarakatProf. Dr., Dept. of Mechanical Engineering, Faculty of Engineering, Helwan
University, Cairo, Egypt.R. M.DarwishLecturer, Dept. of Mechanical Engineering, Faculty of Engineering, Helwan
University, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Current autonomous robots are limited to work only in one single environment. For<br />example (swimming and submerging) in water, (walking, jumping and mobile) on<br />ground or (flying and floating) in air. However, in case of seeking a series of<br />autonomous operations that required to be held in different environments, either<br />many robots should be used, or a single robot that can operate in different<br />environments should be established. Therefore, this research is aimed at designing a<br />single autonomous robot that can fly in air -as Unmanned Arial Vehicle (UAV)-, sail in<br />water -as Unmanned Surface Vehicle (USV)- and move on the ground-as Unmanned<br />Ground Vehicle (UGV)- and this is a new category of robots which could be called<br />Unmanned Multi-environments Vehicle or Autonomous Multi-environments Robot.<br />The mathematical model of the proposed robot is derived using kinematic and<br />dynamic model. Then a linearized version of the model is obtained. The used control<br />approach is based on the linear proportional derivative Integral controller (PID) using<br />nested control loops and applied to the model. Finally the behavior of the Robot<br />under the proposed control strategy is simulated and observed in 3D plot Simulink /<br />Matlab.https://amme.journals.ekb.eg/article_35015_a7311ac83137086781ebc697d3967136.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401DESIGN OF FUZZY CONTROL FOR UNCERTAIN UNDERACTUATED MECHANICAL SYSTEMS1133501710.21608/amme.2018.35017ENM. M.EmarahLecturer, the High Institute of Engineering, City of Science and Culture, 6th of October
City, Giza, Egypt.Journal Article20190616ABSTRACT<br />This study presents a fuzzy control strategy of underactuated mechanical systems<br />with parametric uncertainties. Underactuated mechanical systems have fewer control<br />inputs than degrees of freedom and arise in applications, such as space and<br />undersea robots, mobile robots, walking, brachiating, and gymnastic robots. The<br />Lagrangian dynamics of these systems may contain feed forward non-linear ties,<br />non-minimum phase zero dynamics, nonholonomic constraints, and other properties<br />that place this class of systems at the forefront of research in nonlinear control. A<br />complete understanding of the control of these systems is therefore lacking. First,<br />this paper represents a brief introduction to the underactuated mechanical systems,<br />the causes of their underactuation and parameters uncertain. Then it deals with the<br />analysis and design of fuzzy controller for one of the application of uncertain<br />underactuated mechanical systems; single flexible link robot. The parameters<br />uncertainties of the flexible robot are presented as bounded variation in payload<br />mass and rotational inertia of the link.https://amme.journals.ekb.eg/article_35017_def23e78d964bfce58cf80860deffc57.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401AN EFFICIENT FULL-NUMERICAL SOLUTION FOR THE INVERSE KINEMATICS OF THE 6-DOF FULL-ARTICULATED MANIPULATOR1123501810.21608/amme.2018.35018ENA. A.SaadAssistant Professor, Department of Mechatronics Engineering, Pyramids High Institute for
Eng. and Technology, 6th October City, Cairo, Egypt.Journal Article20190616ABSTRACT<br />The inverse kinematics (IK) problem for the six degrees of freedom (DoF) fullarticulated<br />manipulator is solved either analytically through closed form solutions, or<br />numerically through iterative algorithms. Analytical solutions are in general, if exist,<br />yield redundant solutions at an affordable and reliable computational cost. Numerical<br />solutions that employ iterative algorithms could yield an accurate single convergent<br />solution that depends upon the picked initial guess, but at relatively higher<br />computational cost. In this paper, an efficient numerical solution that employs an<br />innovative implicit iterative algorithm is applied to the decoupled wrist and shoulder<br />DoF, with the relevant jacobians approximated by first-order finite difference<br />schemes. The presented numerical solution has been applied to the HUBO<br />humanoid robot arm to solve for the IK of a single point in the workspace, and also<br />for trajectory tracking problems. The results for both cases have demonstrated high<br />accuracy at an appropriate computational cost suitable for real-time applications such<br />as IK-based walking of humanoid robots.https://amme.journals.ekb.eg/article_35018_c360e8f079b9655a9643d29e0d1ce49e.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401DEVELOPMENT OF ENGINE-AUTOPILOT INTERFACE CIRCUITS FOR UAVS1133501910.21608/amme.2018.35019ENM.YacoubEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />The problem of interfacing Engine Control Units (ECUs) with autopilots in Unmanned<br />Arial Vehicles (UAVs), in the presence of modular communication protocols, is a<br />considerable concern in the UAV industry. This paper presents a development<br />algorithm for interface circuits between ECUs and autopilots for UAVs. The algorithm<br />developed was based on testing and analysing the communication protocols for both<br />the autopilot and the ECU. The engine selected for the analysis was the Zanzottera<br />498H engine and the autopilot was a generic one that produces PWM commands for<br />the actuators. For off-line testing of the developed interface circuit communication<br />performance with the ECU, a hardware PWM generator circuit was developed to<br />mimic the generated autopilot protocol signal. The present work illustrates the steps<br />to analyse both protocols and the procedures to develop such an interface circuit.<br />Finally, the interface circuit was tested experimentally and showed good performance<br />in communication between the autopilot and the ECU.https://amme.journals.ekb.eg/article_35019_5cd7d45c339ca4467759baa1f48cbe75.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401LOW COST X-Y CORE POSITIONING SYSTEM USING STEPPER MOTOR1123502010.21608/amme.2018.35020ENA. Y.AbdelHamidEgyptian Armed Forces.
Corresponding author.M.AbdeldayemEgyptian Armed Forces.M. H.MabroukEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />X-Y positioning is an important task in industrial applications, as this system is used<br />for welding, cutting or for pick and place applications. The studied X-Y core<br />positioning system is a parallel X-Y position device, which due to less moved masses<br />is potentially capable of fast acceleration and therefore faster positioning than<br />traditional stacked systems. A kinematic model of X-Y core positioning system is<br />derived, which used for accurate position control in X-Y stage of the cart using low<br />cost stepper motor and low cost controller (Arduino Mega2560). The proposed<br />design of X-Y core positioning system which has 8 pulleys and two open ended<br />derive-belts and have the double size of all designs that introduced in this field has its<br />advantages of fast design, simplicity and flexibility. The system is very much simple,<br />rugged, and cost effective. The experimental results show that the proposed system<br />has a high resolution, repeatability and error is within acceptable limit. The proposed<br />strategy used to control positioning in X-Y stage enable accurate cart positioning with<br />max error percentage less than 5%.https://amme.journals.ekb.eg/article_35020_93092f4078ef7b032b0f402e2ce67dc8.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401A MODIFIED SAMPLING METHOD FOR LOCALIZATION ACCURACY IMPROVEMENT OF MONTE CARLO LOCALIZATION193502110.21608/amme.2018.35021ENM. A.Awad-AllahGraduate student, Dept. of Mechatronics, Faculty of Engineering, Ain Shams University,
Cairo, Egypt.M. A.AbdelazizAssistant professor, Dept. of Automotive, Faculty of Engineering, Ain Shams University,
Cairo, Egypt.M. A.ShahinProfessor, MTI University, Cairo, Egypt.F. A.TolbahProfessor, Dept. of Mechatronics, Faculty of Engineering, Ain Shams University, Cairo,
Egypt.Journal Article20190616ABSTRACT<br />Unmanned vehicles are devices that can move around and perform tasks without an<br />operator onboard. Such features are essential in many applications. Localization is a<br />very important task in any autonomous mobile robot; in order to reliably navigate, the<br />robot must keep accurate track of where it is. In the past few years Monte Carlo<br />Localization (MCL) has been one of the most successful and popular approaches to<br />solve the localization problem. MCL is a Bayesian algorithm based on particle filters.<br />This paper is an attempt to increase the accuracy of localizing a mobile robot by<br />modifying the way of generating samples from the proposal distribution of the MCL<br />algorithm. Results show improvements in localization accuracy as compared to the<br />basic MCL algorithm.https://amme.journals.ekb.eg/article_35021_e1dabe7368b2debac661a8573b1a0a43.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MODELING OPEN-CELLED ALUMINUM FOAMS STRUCTURE USING 3-D VORONOI DIAGRAM1123502210.21608/amme.2018.35022ENA. M.FathyGraduate student, Dept. of Mech., AASTMT, Cairo, Egypt.M. H.AbdelshafyEgyptian Armed Forces.M. R. AAtiaAssociate professor, Dept. of Mech., AASTMT, Cairo, Egypt.Journal Article20190616ABSTRACT<br />Three dimension (3-D) Voronoi diagram is used to model open-celled Aluminum foam<br />structures. This model simulates the compression response of open-celled Aluminum<br />foam. Models of aluminium foam with different relative density and different cell<br />regularities are used in simulations using ABAQUS. Finite element analysis (FEA)<br />has been carried out to simulate the compression process on Aluminum Foam up to<br />15% strain. Stress-strain curve relation is predicted for each model. The results show<br />good agreement with published experimental and mathematical modeling works. The<br />developed model could be accepted as a virtual platform for modeling open-celled<br />Aluminum foam structure.https://amme.journals.ekb.eg/article_35022_ef74acc8da00a0663850aa931d7c5d68.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401SIMULATING AN INTERVERTEBRAL LUMBAR SPINE DISC1113502310.21608/amme.2018.35023ENH. M.KamelEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />The intervertebral lumbar spine disc (IVD) is a small oval body that connects between<br />two vertebrae. Its degeneration causes lower back pain, which causes economic<br />losses due to treatment and absence from work. Finite element analysis has been<br />used for understanding the complex degeneration process. However, such studies<br />assumed the disc to behave linearly in the elastic region under static loading. In this<br />work, nonlinear FE analysis was used to model the degeneration process as<br />realistically as possible. This was accomplished using an advanced FE capable of<br />simulating the flow of bodily fluid through the living tissues of the disc. This allowed<br />the material properties to change according to time, load and deformation, which<br />occurs in reality. Furthermore, an innovative approach – DOE – was applied to<br />analysis the effect of changing fluid permeability of the annulus fibrosus (AF) and<br />nucleus pulposus (NP), which are the two main parts of the IVD. The analysis<br />revealed that permeability has a strong effect on the value of deformation of the IVD<br />under load. In addition, there is even a clear interaction effect between the<br />permeability of AF and NP on deformation.https://amme.journals.ekb.eg/article_35023_bd813906eecf179f51b0d578c976ce27.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MODELING AND SIMULATION OF A HIP PROSTHESIS IMPLANTATION1123502410.21608/amme.2018.35024ENH. M.KamelEgyptian Armed Forces.Journal Article20190616ABSTRACT<br />Hip replacement implants are currently increasing worldwide. However, the number<br />of failing implants is also relatively high. In this paper, the design of a prosthesis hip<br />joint is analyzed using finite element analysis. A FE model was developed in<br />accordance with the ISO standard and was verified using ANSYS and SIEMENS<br />NX packages. Furthermore, FE results were verified using published experimental<br />results. The verified FE model was then used to simulate the joint under dynamic<br />loading taking into account the effect of level of activity on scaling the loads up. Two<br />material types: TI-6AL-4V and Cobalt–chromium alloys were used and the results<br />showed that TI-6AL-4V alloy proved to have more durability under dynamic loading.<br />In addition, the results showed that the level and type of life activates have an<br />obvious and a pronounced effect on the service life of the prosthesis joint.https://amme.journals.ekb.eg/article_35024_0d3b4b2a3ac1e5787cd8949240f0a1e7.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401MODELING LIGHTNING STRIKE DAMAGE IN CFRP COMPOSITES193502510.21608/amme.2018.35025ENLinYeProfessor, School of Aerospace, Mechanical and Mechatronic Engineering, University of
Sydney, NSW, Australia.Journal Article20190616ABSTRACT<br />Carbon Fiber Reinforced Plastics (CFRP) composites are widely used in modern<br />airplanes to replace conventional metal alloys due to their high strength, high<br />stiffness and light weight. Compared to their metallic counterparts, CFRP composites<br />are vulnerable to lightning strike, and thus Lightning Strike Protection (LSP) system is<br />required. In this work, a coupled thermal-electrical Finite Element (FE) model was<br />used to predict thermal damage in CFRP composites with and without LSP systems<br />during a lightning strike. Pyrolysis of polymer matrices and dielectric breakdown of<br />the insulating layer in LSP system were considered. In addition, lightning strike<br />induced mechanical damage in CFRP composites with a full thermal-electrical<br />protection was determined using a mechanistic FE analysis together with a plasma<br />expansion model, considering different failure phenomena, such as intralaminar<br />damage and interlaminar delamination.https://amme.journals.ekb.eg/article_35025_7c030b4cf5fa52d1776309858e7e8d7c.pdfMilitary Technical CollegeThe International Conference on Applied Mechanics and Mechanical Engineering2636-43521818th International Conference on Applied Mechanics and Mechanical Engineering.20180401EXPERIMENTAL INVESTIGATION OF THICK-WALLED COMPOSITE TUBES UNDER AXISYMMETRIC LOADING1153502610.21608/amme.2018.35026ENA. M.MusratiLibyan Armed Forces, Libya.M. I.El-GeuchyEgyptian Armed Forces, Egypt.E. E.El-SoualyProfessor, Higher Technological Institute, 10th Ramadan; Egypt.Journal Article20190616ABSTRACT<br />This paper addresses thick-walled composite tubes under axisymmetric loading (axial<br />and torsional). A thick-walled tube is manufactured from glass/epoxy composite<br />material, having thickness to outer diameter ratio greater than 0.1. For this highly<br />thick-walled tube, a developed test rig is built to apply a pure torsional load and<br />measure the torsional stiffness of the tube. Adding to that, the tube is tested under a<br />compressive axial load. This is done to validate the existence of the axial-torsional<br />coupling and to experimentally complete the understanding of the tube structural<br />behavior under axisymmetric loading conditions. The testing results are also used to<br />validate the available theoretical methods used in analysis and design of composite<br />tubes under torsion.https://amme.journals.ekb.eg/article_35026_6b1713b29b6f3b962a8a6727aa4d4ea9.pdf