@article { author = {TOLBAHA, F.}, title = {DECOUPLING AND OPTIMUM CONTROL OF A CLASS OF MULTI-INPUT MULTI-OUTPUT SYSTEMS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {171-179}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49395}, abstract = {The design of multi-input multi-output (MIMO) industrial control systems, by use of the modern control theory, usually leads to considerable difficulties as a direct consequence of the following points: the mathematical models are usually of high order and the state feedback schemes are of complicated nature. The present research deals with the problem of simultanious decoupling and control based on the diagonal dominancy over certain frequency range and the stabilization of the inverse Nyquist array (INA) plots at an optimum point. An approximate design technique is proposed for certain class of (MIMO) systems. The effect of emergency outage of one of the controllers is studied. The results have been checked by simulating two-input two-output system on the analog computer.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49395.html}, eprint = {https://amme.journals.ekb.eg/article_49395_16a2379e666eb3438b485159ceac8f62.pdf} } @article { author = {Moustafa, S.}, title = {THE EFFECT OF WATER GAP AND PRESSURE WAVE REFLECTING SURFACE ON CAVITATION EROSION OF CYLINDER LINERS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {181-188}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49407}, abstract = {Vibratory cavitation formation and collapse and consequent material damage are controlled mainly by the driving pressure amplitude. This amplitude is the sum of the generated pressure wave amplitude and the reflected pressure wave amplitude from cylinder block surface. A series of vibratory cavitation erosion tests at different water gaps were carried out at vibration frequencies ranged from 1.85 to 6.4 kHz. Also a series of tests using a rubber disc to act as an absorbing surface instead of the normal brass bottom of test liquid container were conducted. It was found that the erosion rate increases due to the proximity of a reflecting surface, and by suitable treatment of the reflecting surface, this increasing can be eliminated.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49407.html}, eprint = {https://amme.journals.ekb.eg/article_49407_80ddf4521a5963d959144b5f98617b14.pdf} } @article { author = {ABOU-EL-SEOUD, S.}, title = {THE EFFECT OF SUSPENSION GEOMETRY ON A VEHICLE RIDE CHARACTERISTICS DURING DECELERATION AND ACCELERATION}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {189-201}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49419}, abstract = {In designing a modern vehicle, some factors have to be considered. The most significant one, in so far as its long term effects are most profound and widespread such as the transverse-engined(front-wheel-drive) concept. Concomitant with this concept was the realization that the resulting low polar moment of inertia would give, when fitted with conventional suspensions, a high pitch frequency or "small-vehicle ride". The object of this paper is to demonstrate the effects of the suspension geometry on the vehicle pitch and bounce attitudes during braking or acceleration. Two degree of freedom models of a vehicle are employed herein. The steady-state positions in both pitch and bounce are developed for linear systems of typical suspensions that may be either conventional or coupled systems. The results indicate that the rear suspension system makes very significant contribution to the anti-dive properties of either conventional or coupled. suspension systems.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49419.html}, eprint = {https://amme.journals.ekb.eg/article_49419_954d0dd94183ff1b3a18031b4f801a2e.pdf} } @article { author = {METWALLY, H. and SHOULA, O.}, title = {WHIRLING EFFECT ON BEARINGS OF MARINE LINE- SHAFTS UNDER EXTERNAL EXCITATIONS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {203-213}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49422}, abstract = {Due to the ecentricity of thrust force acting on propeller blades, marine shafts experience whirl while rotating. This directly affect the reactions of the different supports, and consequently causes wear of shaft bearings. This paper is concerned with simplifying the concept for the shafting system in order to estimate the frequencies of whirl and propeller tip deflections. The work is dealing with both; three and four span systems with overhaged propeller. The problem is also studied for both mass and massless shafts. For mass-less shafts systems of any number of spans, general formulae for calculating the frequency of whirl and the deflection of propeller tip are proposed. For shaft systems of distributed mass, a procedure is suggested to calculate frequencies as well as deflections at different supports.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49422.html}, eprint = {https://amme.journals.ekb.eg/article_49422_9402624c284b8c3a74d2aa6b8f53e48a.pdf} } @article { author = {Zaghlool, Saad}, title = {IMPROVING THE DYNAMIC PERFORMANCE OF MACHINES VIA MODAL TESTING AND CAD APPROACH}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {215-224}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49427}, abstract = {Dynamic performance has become a significant criterion in the design of many machines. In this paper an integrated approach utilizes modal testing results and finite element modelling into a system analysis routine to give the engineer a usefull tool to select design modifications and to predict the dynamic performance of a new machine. This approach can be used for redesign of existing machines or the development of new systems. A specific application of the method on a harvester sha-ker is described.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49427.html}, eprint = {https://amme.journals.ekb.eg/article_49427_f560e45d71705dfa3e89bc1958c974d8.pdf} } @article { author = {BASSIOUNI, A. and ABDEL MOHSEN, A.}, title = {VIBRATION CONTROL BY DRY FRICTION DAMPER}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {225-236}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49432}, abstract = {This work is concerned with the study and use of dry friction dampers for vibration control. First, the characteristics of the friction damper are determined. Then, the friction damper is applied to a hinged-hinged beam,The amplitude-frequency response for a harmonic excitation is determined both theoretically and experimentally. For linearization of the equations of motion, the friction force is replaced by an equivalent linear viscous force dissipating the same energy per cycle. The results obtained from experiments and theory are in good agreement, and it is shown that, by a suitable choice of the ratio of the friction force to applied force the friction damper can be an effective damping device.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49432.html}, eprint = {https://amme.journals.ekb.eg/article_49432_76bdf726b5f22e47df0f7d9bf7e7d380.pdf} } @article { author = {METWALLY, H. and EL-SAYED, M.}, title = {VIBRATION OF A VARIABLE CROSS SECTION SHAFT CARRYING MULTI-DISCS WITH ANY NUMBER OF EXCITATIONS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {237-246}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49434}, abstract = {This paper presented the systematic procedures for finding the critical speed and the bending moment in each segement of the vibratory variable cross-section shaft carrying multi discs. Lateral vibrations result from transversal dynamic excitations. The influence coefficients are obtained by using "Castigliano- Theorem". Samples of .data for the obtained results are presented for a shaft carrying 'three discs with an eccentricity on the second disc for both cases of end supported and over hanged shafts on rigid support ipcluding the variation of disc position. The results of shaft amplitudes and natural frequencies are obtained by computer analysis.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49434.html}, eprint = {https://amme.journals.ekb.eg/article_49434_b7ff9a3c7914ba71f7ad9fd32113ab5c.pdf} } @article { author = {Hammouda, M. and Fouad, M. and Ibrahim, M.}, title = {ELASTIC CONTRIBUTION OF A NOTCH TO A CRACK AT ITS ROOT}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {127-135}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49561}, abstract = {The purpose of the present work is to estimate the extent to which elastic stress-strain field of a notch has some contribution to the behaviour of a crack emanated from the notch root . A current work necessitates the analysis of some non-standard notch geometries with no data available in the literature. Two dimensional elastic finite element technique is used for such a study. The states of plane stress and plane strain are analysed. In the present approach a model based on the concept of equivalent cracks applied to the relative movement of the two surfaces of Irwin's elastic crack is suggested Alternatively, and for comparison, stress intensity factors for all cracks analysed are computed by making use of the energy release rate concept .}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49561.html}, eprint = {https://amme.journals.ekb.eg/article_49561_5da5555b772263f693f77adaa936e28c.pdf} } @article { author = {SHEHA, G.}, title = {STATIC STIFFNESS OF THE BOLTED CONNECTIONS SUBJECT TO THE NORMAL AND SHEAR LOADS.}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {137-144}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49562}, abstract = {This paper discusses the normal and shear stiffness of the bolted connections, It has shown that the shear stiffness can be determined from the parameters that define the normal stiffness of the machined surfaces. The factors affecting the static stiffness have been investigated. A mathematical analysis of the design parameters have been developed. They are ; normal and shear loads, geometry and dimensions of the two mating surfaces. Determination of the static joint stiffness and some basic optimum values would then be within the reach of the designer.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49562.html}, eprint = {https://amme.journals.ekb.eg/article_49562_6e514cf5e2b1ad5ea95d426b50cddc68.pdf} } @article { author = {EL. BEKHET, N. and MOMEH, Z. and EL-SHERIF, F.}, title = {EFFECT OF SHELL ENDS ON THE CONTACT PROBLEMS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {145-156}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49563}, abstract = {The effect of shell ends on the contact problems of saddle supporting cylindrical shell is solved using the semi-bending theory of shells. The saddle / cylinder interface pressure and the stress distributions are found for different saddle angles, for both welded saddle and not welded saddle. The min. distance of the saddle position from the shell end is found such that the end has no effect on the stress at the saddle positions. The circumferential stresses at the plane of middle profile of the saddle are found experimentally using strain gauge. The experimental results are in good agreement with those obtained from numerical analysis.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49563.html}, eprint = {https://amme.journals.ekb.eg/article_49563_f306200428792a6355f267d5cd377c3a.pdf} } @article { author = {Abdel-Raouf, H. and El-Haddad, M.}, title = {FRACTURE CONTROL PLAN FOR WELDED SHIP HULLS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {157-166}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49579}, abstract = {The present work describes a fracture control plan that optimizes different design parameters in order to establish effi-cient and safe performance of ship hulls relative to cost considerations (including material, design, fabrication, operation, testing and maintenance) following fail-safe philosophy. For ship hull materials the toughness requirement necessary to ensure general elastic-plastic performance is:(KId / σyd) ≥ 0.6 at - 18°Cand at the minimum service temperature of 0 °C, (KId / σyd)≈ 0.9. It is recommended to use 5/8 inch dynamic tear (DT) test specimens and use its results to predict the dynamic toughness values for ship hull steels and weldments.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49579.html}, eprint = {https://amme.journals.ekb.eg/article_49579_ff07d62ec2bda56ba8c562c3c80c76cc.pdf} } @article { author = {Majid, Munir}, title = {MECHANICAL METHOD TO DETERMINE RESIDUAL STRESSES IN CARBURISED STEEL}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {167-179}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49585}, abstract = {The residual stresses that generates upon carburising and hardening are allowed to undergo a relaxation process, and produce a curveture in 080M15 steel bars. The degree of curveture is found to vary depending upon the carbon distribution. The fibre stress necessary to reduce the deflection to zero is evaluated and related to the surface residual stresses. The residual stresses incarburised & hardened 080M15 steel is fund compressive when decarburisation is not allowed to take place, and tensile upon the occurance of decarburisation Carburising conditions are veried to produce different carbon profiles, that influence the residual stress pottern. The highest compressive residual stresses of 661 MN/m² resulted from boost-diffuse carburising, in which the carbon content of 0.8% is maintained constant to a depth of 0.3mm. Compressive residual stresses are lowered upon the occurance of retained austenite and even further when carbides are also formed.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49585.html}, eprint = {https://amme.journals.ekb.eg/article_49585_2aae09fb664ebf29d1ada3dd749ca4c6.pdf} } @article { author = {Fattah, A. and Rajaiah, K. and Bose, M.}, title = {A NEW METHOD OF DETERMINING THE STRESS INTENSITY FACTOR FROM ISOCHROMATIC FRINGE LOOPS.}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {181-189}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49589}, abstract = {This paper describes a new four parameter method of analysis for determining of the stress intensity factor (SIF). The method bypasses the error-prone measurements on the isochromatic pattern near to the crack tip and uses data from thenear of the crack tip as well as extended stress field. Suitable expression was developed for the determination of the fourth parameter based on isochromatic fringe loop information. Results were obtained by the computer program (EGYPT) for different values of the parameters β and α to give the best accuracy of determining the stress intensity factor (K). The results obtained for Dobeckote-505 show good agreement with the analytical results.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49589.html}, eprint = {https://amme.journals.ekb.eg/article_49589_bbc643be573e292d35be47ee5d556ee6.pdf} } @article { author = {COOKSON, R. and SATHIANATHAN, S.}, title = {ANALYSIS OF STEADY STRESSES IN ROTATING ANISOTROPIC DISCS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {191-200}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49600}, abstract = {A full closed-form analysis, based upon the Filonenko-Borodich small displacement technique, for the stress distribution within rotating, constant thickness, annular, anisotropic discs, is given. The solutions obtained are much more general than those arising from the use of the very specific orthotropic condition, which is misleadingly described as anisotropic by many authors. However, in order to test the validity of this technique stress distributions for the orthotropic case (Vθ/Eθ = Vr/Er) have been computed with its aid. These results are compared favourably with those obtained by previous authors, and highlight the influence of the radius ratio, anisotropic constant, and Poisson's ratio upon the stress distribution.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49600.html}, eprint = {https://amme.journals.ekb.eg/article_49600_ac0888e58682bbd3ea17147279f9ef6a.pdf} } @article { author = {Gaballa, Mohamed and Badran, Farouk}, title = {EXPERIMENTAL DETERMINATION OF THE STRESSES AND STRAINS IN A THICK PVC CYLINDER REINFORCED BY A STEEL SHELL.}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {201-214}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49612}, abstract = {The proplem of theoritical determination of stresses and strains in a thick walled viscoelastic cylinder reinforced by steel shell and subjected to interinal pressure and external pressure (arising due to the elastic shell) had been treated by the authors [1,2].To check the theoritically obtained solution of the discussed problem experimental investigations are carried out. In this experimental work the elastic shell is made of steel and the viscoelastic cylinder is made polyvinyle-chloride (PVC). The dimensions of the steel shell and PVC thick cylinder are estimated with reference to the actual rockets working with soild propellant fuel. The experimental tests are performed under constant pressure which corresponds to the steadyconditions of the soild fuel rocket work. These tests are worked out on specimens of different diameters of steel shells and PVC cylinders with an apparatus designed specially for this purpose. The theoritical solution of the considered problem incase of PVC is obtained using the same analysis and computer program used before [2] . The only difference is that themechanical constants El, E2, n1 and n2 of the used before material is replaced by that of the PVC . To going through these theoritical investigations, the mechanical properties of the PVC must be measured this was carried out in another work [3].}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49612.html}, eprint = {https://amme.journals.ekb.eg/article_49612_9ff2d89f92839be9b2e2adaa2226ad64.pdf} } @article { author = {FATTAH, A. and RAJAIAH, K. and BOSE, M.}, title = {A NEW METHOD OF DETERMINING THE MIXED-MODE STRESS INTENSITY FACTORS FROM ISCCHROMkTIC FRINGE LOOPS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {215-222}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49630}, abstract = {The presence of cracks in any structure or structural component may result in the total failur of the structure. The stress intensity factor (SIF) provide a single parameter representation for the stress condition at the crack tip.This paper desoripes a new evaluation method of the isochromatic fringe pattern for the determination of mixed mode stress intensity factor. The method bypasses the error-prone measurements on the isochromatic pattern near to the crack tip and uses data from the near of the crack tip as well as extended stress field. The four parameter method of determining the op-ening mode stress itensity factor (KI), developed by the authors [1) was extended to incorporate the more general case of an arbitrarily oriented crack problem, wher the stress field is governed by two mixed mode factors KIand KII. The method presented here is easy and the use of the full-field data per-mits a significant improvement in the accuracy of determining the mixed mode stress intensity factors. Experimental evidence corroborated the re-sults obtained by the new mehtod.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49630.html}, eprint = {https://amme.journals.ekb.eg/article_49630_95d7b52525669084770e63fe27a20054.pdf} } @article { author = {ROUSHDY, E.}, title = {THEORETICAL INVESTIGATION OF TRANSMISSION LOSS FOR DIFFERENT IN—PARALLEL TUBING CONFIGURATIONS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {45-61}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49637}, abstract = {A generalized formula predicting the attenuation of a main pipe branched into two in–parallel pipes joined together at their inlet and outlet in terms of the system dimensions has been investigated. The obtained formula reduces to that of known shapes and configurations through simple adjustments in the model. Examples of the expansion chamber and the side branch transmission loss equations have been achieved. A computer model for the system has been developed and proven applicable.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49637.html}, eprint = {https://amme.journals.ekb.eg/article_49637_dfee31c98c7b8852264e1cd9943ae4ec.pdf} } @article { author = {ROUSHDY, E .}, title = {PREDICTION OF THE TRANSMISSION LOSS CHARACTERISTICS OF THE MUFFLER REVERSING SECTION}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {63-80}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49641}, abstract = {A one-dimensional mathematical model that predicts the attenuation characteristics of the muffler reversing section has been developed. The model is based on the generalized four-pole-analogy of the propagation of acoustic plane waves in two-in-parallel tubing configuration. Transmission loss measure-ments using the two microphone random excitation technique- were carried out on four different samples of the muffler reversing section. Comparison between measured values of the transmission loss and those predicted by the mathematical model demonstrate a reasonably good overall agreement. However, shifts of the calculated transmission loss peaks at some frequencies reflect slight deviation between theory and experiment. Closer agreement between theoretical and experimental results can be obtained by developing a more complicated three dimensional model.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49641.html}, eprint = {https://amme.journals.ekb.eg/article_49641_a297a940a8f7db00bdc4da8f49cf3563.pdf} } @article { author = {ZAKI, M. and RASHED, F.}, title = {A DATA STRUCTURE FOR PROCESSING THREE-DIMENSIONAL ENGINEERING DRAWINGS IN A SMALL GRAPHIC SYSTEM}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {157-168}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49659}, abstract = {The use of computers for processing three-dimensional (3D) engineering drawings has been investigated in this paper. The essential properties of a hierarchical data structure are pointed out and employed to provide a natural computerized data structure for representing the geometry of the drawn part The intrinsic flexibility of that structure makes it possible to keep track of a full 3D description of the part under consideration. Although a hierarchical data structure is not the neatest structure for expressing geometrical properties, it may form a convenient framework for data processing. It also has the advantage of being embedded in high-level languages. In the system presented here auxiliary light buttons are introduced to facilitate unambiguous stepping up or down through the structure hierarchy. Consequently the system can adequately transfer program control to a particular part of the graphic system to perform the exact specific tasks. The given system handles solid objects with plane surfaces and can be extended for processing cylindrical surfaces when they ere represented by their canonical parameters. Such a system will be economical and quite convenient for drawings that are widely used and subjected to frequent minor changes.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49659.html}, eprint = {https://amme.journals.ekb.eg/article_49659_59dc04ec07bb7add48a39313eb1435ff.pdf} } @article { author = {EL-SOMOKHLY, S. and Hons, Hons. and MRINA, MRINA}, title = {TOWARDS MINIMUM WEIGHT AND COST-EFFECTIVE DESIGNS OF FLAT AND PITCHED STRUCTURES}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {169-178}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49664}, abstract = {The main objective of this paper for weight and cost consideration designs is to give the designer a better tool to compare the relative merits of various design alternatives and to be able to select the corresponding most minimum weight or cost-effective design. An example of a typical problem in shipbuilding is studied in order to explore some general aspects of -design. Two different structural forms are considered (flat and pitched). In order to obtain realistic comparisons, the production costs considered in this research are according to the current practice in Egyptian shipyards. A key finding from the results is that if the optimisation is based on a minimum weight or minimum cost criterion, the pitched structures are superior over the flat ones. In other words, significant savings in weight and cost can be achieved by replacing flat structures by pitched structures. The labour cost should include the pre-fabrication, sub-assembly, fitting and other relevant activities costs in addition to the welding costs. In addition to the material and labour costs, the total costs should include the overhead costs in order to make a realistic decision for best design.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49664.html}, eprint = {https://amme.journals.ekb.eg/article_49664_4ac1584f922da95aebd675f81692fa41.pdf} } @article { author = {MOKHTAR, M. and HANNA, H. and KHALIFA, S. and EL.HIFNAWY, N.}, title = {ON THE ANALYSIS OF WEAR PARAMETERS, AN EXPERIMENTAL STUDY}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {179-188}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49665}, abstract = {A detailed experimental study is, herein, presented to demonstrate the effect of most contributing parameters on the trend of wear variation. Results attained show the effects of applied loads, speed and frictional work on wear rate for different interacting materials . Micrographs are taken to investigate surface changes under various mater-ials combinations at different operating conditions. The results showed that softer materials usually transfer to the harder, and transition from mild to severe wear is affected by the magnitude of load and speed. Results have shown that wear rate is functionally dependent on the appli-ed load and a proposed speed (sliding/rolling) parameter. A wear rate formula could thus be formulated to identify a basic wear coefficient and a limit beyond which mild followed by severe wear would occur.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49665.html}, eprint = {https://amme.journals.ekb.eg/article_49665_d6f04929ca80e4595eb7972dad9e1f66.pdf} } @article { author = {SALEM, F. and EL-SHERBINY, M.}, title = {ION PLATED THIN METALLIC FILM LUBRICANTS FOR ROCKETS AND SPACE VEHICLES}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {189-198}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49666}, abstract = {This paper presents experimental results on the frictional behaviour of ion plated soft metallic films.The conventional ion plating process is used to deposit low melting point materials such as silver, lead, indium, and tin. Tribotesting of the coatings is made both in ultrahigh vacuum and in normal atmosphere on a pin-disc machine.The results indicate that an intermetallic composition of 60% pb, 25% In, 10% Sn and 5% Ag is the best for its low friction and long life.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49666.html}, eprint = {https://amme.journals.ekb.eg/article_49666_3433475a3cb6e12b0c704723ce0dc159.pdf} } @article { author = {EL-SHERBINY, M. and ABDELAZIZ, S.}, title = {FINITE ELEMENT ANALYSIS OF NON-CIRCULAR HYDRODYNAMIC BEARINGS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {199-211}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49667}, abstract = {The paper presents the results of a finite element analysis of non circular bearings, such as displaced, half lemon, and spiral bearings. A number of bearing characteristics are discussed and some geometrical and operational parameters are concluded.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49667.html}, eprint = {https://amme.journals.ekb.eg/article_49667_0927243071781f82ebe0c949f371ac89.pdf} } @article { author = {El-Haddad, M. and Abdel - Raouf, H.}, title = {FATIGUE BEHAVIOUR OF STRUCTURAL COMPONENTS AT THRESHOLD}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {213-223}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49669}, abstract = {The present paper investigates the influence of several variables on the fatigue behaviour of cracks at therashold. Variables considered are crack size, mean stress, crack closure and type of loading. Several fracture mechanics models are developed to simulate the effects of such parameters on the fatigue therashold. The accuracy of these models were tested using wide range of experimental data. The present work plays an important rule in design against long life fatigue of structural components.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49669.html}, eprint = {https://amme.journals.ekb.eg/article_49669_6238229fb8b57fe7689bdb9b37a1034e.pdf} } @article { author = {NASSER, M.}, title = {DESIGN OF HYDROSTATIC SCREW AND NUT}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {225-232}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49671}, abstract = {This article is concerned with a proposed simple method to design an exter-nally pressurized trapezoidal and rectangular screw and nut mechanisms. The general lubrication assumptions are applied to the governing equations and continuity equation of the lubricant. The reduced equations are then used in an assumed double film annular bearing which is considered to be .equivalent to one turn of the hydrostatic screw. It is found that the performance characteristics of a hydrostatic screw such as power consumed ,volume flow rate, and static stiffness can be estimated in an easy manner. Furthermore, the optimum operations conditions can easily be determined.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49671.html}, eprint = {https://amme.journals.ekb.eg/article_49671_c57f209c31c0824556da516739363db2.pdf} } @article { author = {MOKHTAR, M. and BEDEWY, M. and ELMOWAFY, S.}, title = {PREDICTED TRIBOLOGICAL BEHAVIOUR OF ASBESTOS REINFORCED COMPOSITE FRICTION MATERIAL}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {233-241}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49677}, abstract = {It has been herein decided to formulate empirical formulae to correlate tribological behaviour of composite material with operating conditions. Asbestos reinforced resin bonded friction material has been chosen as an examplary composite material to be put under experimental investigation. To investigate experimentally the tribological behaviour of friction composite material we got to conduct friction and wear tests under either isothermal or transient temperature tests. A constant speed drag dynamometer (SCHENCK) has been used for conducting both the isothermal and the transient temperature tests under constant energy input conditions. The coefficient of friction has been found to decrease with applied load increase following a power function of the form f α pͣ  with an index (a) ranging from -0.27 to - 0.32.3. Arrhenius relation w α e -E/RT has been satisfactorily used to express the isothermal wear with activation energy values in the range (25-41k joule/mole), whereas, under transient temperature test conditions, the material weight loss (W) has been found to increase with both the contact pressure (p) and sliding distance (L) following a power function of the form W=KpcLd.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49677.html}, eprint = {https://amme.journals.ekb.eg/article_49677_238c1bd17407d210acd8ea8ef6df30bc.pdf} } @article { author = {Sallam, Tharwat and Seliman, Mahmoud}, title = {The Use of a Lazer Aided-Interferometer for the Study of the Temperature Field in the Wake of a Cylinder}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {243-251}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49706}, abstract = {Formation, development and instability of the vortices system are observed visually by means of Mach-Zehnder interferometer. A lazer source is used for the optical image of the formed vortices in a variable temperature field.The investigation is conducted for a group of two-dimensional circular models at a constant Strouhal number of 5000. The excellent agreement, exhibited by the results provided by the observed cases; give an accurate and full description for the evaluation of the flow structure behined the cylinder. It is concluded that the influence of the temperature field is toretard the evolution of the near-wake, as well as moving the location of the separated shear layers dowstream. The observed region by the lazer aided-interferometer reveals a good estimation of the bulk flow temperature field behined the cylinder.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49706.html}, eprint = {https://amme.journals.ekb.eg/article_49706_2e18c911059ad91026b2ce2589eacc8c.pdf} } @article { author = {SHEHA, GABER}, title = {TURNOVER STIFFNESS OF BOLTED JOINT ASSEMBLY}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {253-265}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49708}, abstract = {Bolted joint assembly is commenly used in various design problems. An optimized joint design is best suitable for one set of design parameters.This paper is concerned with the bolted joint assembly subject to a turnover load. The objective is mainly to approach as closely as possible to some appropriate mathematical analysis to the most important design parameters. These parameters are; turn-over load, quality, geometry and dimensions of the two mating surfaces. Several assumpations have been taken into consideration to simplify the proposed mathematical model. Calculation of the joint stiffness and some basic optimum values would then be with-in the reach of designer in a minimum time and less effort.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49708.html}, eprint = {https://amme.journals.ekb.eg/article_49708_6484622efd428bbc2f028232c1f9f5b0.pdf} } @article { author = {ABDEL-MONEIM, M. and HEWIDY, M.}, title = {SLIP LINE FIELD APPROACH FOR THE ASSESSMENT OF SCRAPING FORCES}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {267-276}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49710}, abstract = {A slip line field technique is adapted to estimate scraping forces in the present research for conical tools scraping. Hencky's equations are applied assuming orthogonal slip line field to prevail while scraping. The contact pressures acting around half of the cone periphery are calculated assuming sticking conditions to exists along conical toolssides. In such a manner, the values of horizontal and vertical force components acting on the tool are predicted. The horizontal force are found to be functions of the work-piece material yield strength in shear and the contact area of the cone together with its half semi-cone angle. On the other hand, the vertical force components are found to be functions of the workpiece material yield strength in shear, the unit area of the cone which is in contact with the workpiece and half semi-cone angle. The apparent coefficient of friction can be also predicted via the proposed slip linefield technique. Such theoretical predictions are compared with a large amount of experimental data obtained for the dry scraping of sharp cones of high speed steel tools cuting free machining brass as well as commercially pure aluminium blocks. Fair agreements between theory and experiments are noted. Reasons for discrepancies are discussed.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49710.html}, eprint = {https://amme.journals.ekb.eg/article_49710_8d10c5b42336800d717f2a257af70355.pdf} } @article { author = {Hassan, G. and Ibrahim, G.}, title = {STEADY STATE SHAPE CONTROL OF COLD ROLLED STEEL SHEETS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {131-140}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49714}, abstract = {In the commertial utilization of sheets produced by cold rolling, it is desirable that the gauge of the material be as uniform as possible and the shape defects are minimum. Flatness of cold rolled products is important when they are used in some fields such as rocket engine casings and other aerospace hardware. A steady state multivariable control scheme is presented in the paper aiming at controlling the minimum and maximum thicknesses of the rolled sheets against any disturbance. Required models are derived in general form and the model gain coefficients are obtained for the cold rolling line of the Egyptian Iron and Steel Company. The paper presents the different ways of applying the proposed control scheme including simple manual method suitable for the developed countries.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49714.html}, eprint = {https://amme.journals.ekb.eg/article_49714_d0384aa0beb29155b813d7cdf7b0f045.pdf} } @article { author = {EL-LALTHY, HASSAN and ISMAIL, MOHAMED and BAHI, SHERIF}, title = {INTRODUCING HEURISTIC METHODS TO SOLVE SCHEDULING OF MULTISTAGE FLOWSHOP WITH IDENTICAL PARALLEL MACHINES}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {141-152}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49717}, abstract = {The objective of this study is to develop an algorithm which can solve the scheduling problem of multistage flowshop with identical parallel machines in every stage. This was achieved heuristically and an aIgorithm was developed to solve this problem. This heuristic algorithm was applied to schedule the production of special purpose servicing equipment capital repair workshop. As an indication of algorithm efficiency,the absolute maximum production volume was determined using a linear programming model and compared to that realized by the proposed algorithm.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49717.html}, eprint = {https://amme.journals.ekb.eg/article_49717_02d8fa511a8c272546d0988761dcd009.pdf} } @article { author = {Sheha, Gaber and Abou El-Einene, Ahmed}, title = {FACTORY LAYOUT FOR SMALL METALLIC-DISC MILLS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {153-161}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49723}, abstract = {Today, a classical mills (natural-stone mills) are Commenly used in the Egyptian rural areas. It is a primitive method for food production and also costly. Recently; the advanced mills (metallic-disc mills) has been developed and the main design problems were solved. This study is an attempt for applying systematic layout planning Techniques in carrying out an advanced factory layout for the small metallic-disc mills in the rural areas of Egypt, as closed as possible to the ideal layout of the mills has been studied. Aquick review for the principles and objectives of the "Good plant Layout" has been presented. The available data about this work were collected from the past experience of the existing mills in Egypt Alternative layouts were carried out and the best two has been selected. Finally a detailed layout was proposed. A Suitable comparison chart of the total cost is proposed to help the engineers for deciding the best and the economical Site for building the mill.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49723.html}, eprint = {https://amme.journals.ekb.eg/article_49723_8409f4c28e5e96ef8c7fabc8f72e9196.pdf} } @article { author = {BAHI, SHERIF and FAT-HALLA, NABIL and EL-MAHALLAWY, NAHED and TAHA, MOHAMED}, title = {WORK HARDENING IN TURNING OF AL-10%WT CU ALLOY PRODUCED BY RHEOCASTING}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {163-172}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49854}, abstract = {The present paper gives some results on the work hardening obtained during turning of A1-10% Cu alloy produced by rheocasting and conven-tional casting techniques. The machinability of this alloy is shortly discussed. A simple procedure was adopted to turn cylindrical workpieces on a centre lathe to investigate the effect of the feed and the depth of cut on the work hardening of such an alloy. Microhardness was measured across specimens, thus determining the depth of the work hardened zone in the vicinty of the periphery. Results show that the depth of the work hardened layer in the rheocast specimens was less than that of the con-ventionally cast specimens indicating better machinability of the former. This behaviour is related to the microstructure formed by each casting technique. The relatively hard spheres of primary phase embedded in a highly fine two phase harder matrix present in the rheocast specimens is thought to be responsible for the smaller depth of the work hardened zone.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49854.html}, eprint = {https://amme.journals.ekb.eg/article_49854_6a811d7099e3aacfa08b9751c0948854.pdf} } @article { author = {AEO EL-EINEEN, A, and KHEDRE, OSAMA}, title = {INVESTIGATION ME OPTIMUM CONDITIONS OF GRAIN MILLING}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {173-178}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49858}, abstract = {The objective of this work is to study the optimum conditions of grain milling during the milling process, and find out the best values for the design parameters (disc diameter, crossing angle of furrows, disc weight and rotational speed).}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49858.html}, eprint = {https://amme.journals.ekb.eg/article_49858_025891a117511a77731ae41e4c8d87df.pdf} } @article { author = {AHMED, O. and ABDEL-AZIM, O. and ABDEL-RAHMAN, M.}, title = {THE PRODUCTION OF HOLLOW ARTICLES FROM TUBES BY CONSTRAINED UPSETTING TECHNIQUE}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {179-187}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49862}, abstract = {An investigation is made of the radial upsetting of metallic circular tubes into a die cavity, of different contours, in which an axial collar is produced. A clew to the metal flow mode is given, the physical plane model of deformation is suggested and the corresponding triangular velocity field is constructed. An upper bound solution is utilized for finding the upsetting load. The theoretical predicted load values are compared with those obtained experimentally. Pressure rating tests of the produced articles are performed. Distribution of wall thickness strain and hardness values are determined and discussed.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49862.html}, eprint = {https://amme.journals.ekb.eg/article_49862_6f8d3b8a0850eb01d6fe93fe26131c2d.pdf} } @article { author = {Abd El- MONEIM, M. and ELKHABEERY, M.}, title = {FORCES PREDICTION DURING CUTTING WITH CONTROLLED CONTACT LENGTH TOOLS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {189-197}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49864}, abstract = {Forces induced upon the dry orthogonal cutting of 2024 Aluminum alloy employing controlled contact length tools are predicted via two published models developed by Abdel Moneim. The experimental data, at a cutting speed of 120 m/min, are checked against the theoretical models. Theoretical values for both cutting and thrust forces relevant to tool nose edge are assessed utilizing Abdel Moneim finish machining model. The second theoretical model, offers an approximate upper bound solution for predicting the forces which act upon inclined straight tool rake sur-faces utilizing a simplified slip-line field technique. Such two models, combined together, predicted the values of both cutting and thrust forces induced during machining with controlled contact length tools. Experimental force data are recorded by the second author for orthogonal dry machining of solution treated and aged 2024 aluminum alloy at a relatively high speed (120 m/min) selected to avoid complications of active build-up formation. Such data are found to be in fair agreements with theoretical models.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49864.html}, eprint = {https://amme.journals.ekb.eg/article_49864_e2596562149e598768187913234a9290.pdf} } @article { author = {EL BAHI, A.}, title = {MODERN TECHNIQUES TO IMPROVE SURGE MARGIN IN AXIAL COMPRESSORS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {199-208}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49868}, abstract = {In modern military aircraft engines, the stable flight envelope is limited by the compressor surge which is an unsteady working condition affecting both compressor and receiving circuit (i.e. all engine components). This obliges the engine designers to provide for a "SURGE MARGIN" i.e. a limit of the working domain excluding this instability. The choice of this stability margin must be wade during preliminary design and design stages considering both global design parameters and fine costruction elements. The modern design techniques must take into consideration not only the cnal geometry and the axial load distribution between compressor stages, but also the radial load distribution on each stage. In addition to these global design parameters we discuss also in this paper the effect of fine construction elements such as nominal incidence, tip clearance, blade aspect ratio, stage solidity, casing treatement, bleeds and variable geometry.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49868.html}, eprint = {https://amme.journals.ekb.eg/article_49868_b3dad9211b462b37174a34b857d83285.pdf} } @article { author = {Hegazy, Abdel-Aziz}, title = {ENERGY RELATIONS FOR UNDERWATER EXPLOSIVE SHEET METAL FORMING}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {209-219}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49892}, abstract = {There are several approximate relations for the calculation of the strain energy of plastic deformation of an explosively formed part and the explosive energy received by the blank through the water as an energy transmitting medium. A new energy equation is derived by the author. The equations are evaluated using the experimental data of previous investigations. The best relations are obtained for a specified range of the LID ratio (stand-off distance/die diameter). The limitations of the validity of the relations are indicated.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49892.html}, eprint = {https://amme.journals.ekb.eg/article_49892_d0710de96e93961e9aa6e89c67d90bf5.pdf} } @article { author = {El-Midany, T. and Abd El Latif, A.}, title = {ROBOTS WITHIN A FLEXIBLE MANUFACTURING SYSTEM}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {221-234}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49897}, abstract = {In recent years greater emphasis has been placed on keeping manufacturing costs down, profits levels up and staying ahead of competition. With labour and material cost at an all-time high more cost effective production solutions are being investigated by means of Flexible Manufacturing Systems (FMS). The application of industrial robots to FMS and to production cells has, however, been rather limited. Proper use of robot within the frame work of a flexible manufacturing cells was up to now only made in relatively few applications. This is probably due to their relatively high cost, the need to distribute the cost between machines in the cell and the problem of balancing machining operations throughout the cell to maintain component flow. However, we expect Flexible Manufacturing Systems and robot systems having less peripheral units by expanding robot variety from simple types to high performance types, development of better sensors and robot languages, higher performance robot controllers and cost reductions. Hence, this paper investigate the importance of applying robotic principles in support of improved flexible manufacturing systems, leading eventually to the factory of the future able to operate unmanned for substantial periods, especially at night.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49897.html}, eprint = {https://amme.journals.ekb.eg/article_49897_14a997ec6c238052f59adb015343fa9a.pdf} } @article { author = {ABU-ZEID, O.}, title = {CORROSION OF CADMIUM PLATED STEEL COUPLED TO DIFFERENT TYPES OF ALUMINIUM ALLOYS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {235-240}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49901}, abstract = {In many applications of the aircraft industry, aluminium alloysand steel components may come into electrical contact. In order to reduce the resulting danger of galvanic corrision of aluminium alloys, steel components are often coated with a metal or an alloy which is more active than the steel. Cadmium electroplatings are currently used to perform this function in the Egyptian aircraft industry. Some of the special characteristics that recommend the use of cadmium platings are the good lubricity, solderability and corrosion resistance. However, it is claimed that the service life of cadmium as a protective plating is relatively short. In this paper the main function of cadmium plating of providing cathodic protection for the coupled aluminium alloys is tested. Cadmium plated steel substrates of different plating thicknesses have been connected to 7075-T6, 2024-T3 and 5056 aluminium alloys in 3.5% Na cl salt solutions. Galvanic corrosion current measurements have shown that cadmium platings accelerate the corrosion of the 7075-T6 aluminium alloy and cathodically protect the 2024-T3 and 5056 alloys for short periods.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49901.html}, eprint = {https://amme.journals.ekb.eg/article_49901_b9985276f66b107fffa53a8a38162049.pdf} } @article { author = {Hassan, G. and Ibrahim, G.}, title = {STEADY STATE MODEL FOR HELWAN REVERSING FOUR HIGH MILL COLD ROLLING STAND}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {241-249}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49905}, abstract = {The cold rolling process is one of the important processes in the Egyptian iron and steel industry. For thorough understanding of the process mechanics and the effect of its key operating variables on its performance, it has to be modelled. Furthermore, modelling of the process helps in building steady state optimization program and achieving high level control strategies aiming at improving its performance. A complete steady state modelling scheme has been applied to the 1200 mm reversing four high mill stand of Helwan Iron and Steel Company. The mathematical model covers the rolling force, the specific torque, the forward slip of the strip at the bite exit, the deflection of the rolls, the maximum stress induced in the roll and the efficiency of the rolling process. Strip thickness of 2 mm and percentage reduction from 10 to 50 % have been considered.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49905.html}, eprint = {https://amme.journals.ekb.eg/article_49905_0bc3e508b3cfa0687cf2bdaa15aeb82a.pdf} } @article { author = {GABER, A . and SHAWKY, A . and NOSSEIR, T. and ABDEL SALAM, M.}, title = {RELIABILITY OF A COMPLEX MECHANICAL SYSTEM WITH UNKNOWN CONFIGURATION}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {63-67}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49909}, abstract = {In performing the reliability of a mechanical system, models are formulated to fit the logical structure of its decomposition to subsystems and components. But in many cases the system is of a more complicated nature that it seems difficult. to relate its configuration to a known model. In the presented paper a new technique is introduced to determine the reliability of a complex mechanical system with unknown configuration to its subsystems. The solution is based on the experimental data of testing the system as a whole without a need to any information about how the subsystems are interconnected. Even when the tested sample is only one system it is possible to get an information about the reliability of any one of its subsystems.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49909.html}, eprint = {https://amme.journals.ekb.eg/article_49909_c1b65a4cfff91fc8e641da023af27c88.pdf} } @article { author = {Rashed, Farouk}, title = {Simulation and Optimization Models for Integrated Production Planning}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {69-82}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49913}, abstract = {The objective of this paper is to identify the integrated production planning and analyse its relationships to other production decisions. In this respect, a methodological approach has been developed for analyzing the factors involved in production management decision making. Emphasis is given to the role of modeling as part of this systematic approach. We indicate the extent to which problems in production planning can be solved by modeling techniques. Our approach uses both simulation and optimization methodologies in a complementary manner rather than performing integrated production analysis with a large-scale model of either the simulation or optimization type. Recommendations are given for better formulation and applications of mathematical models solving given production problems.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49913.html}, eprint = {https://amme.journals.ekb.eg/article_49913_13dc2adbecd941bce4378a24751329dc.pdf} } @article { author = {NAGA, S.}, title = {MODIFIED ANALYSIS AND OPTIMIZATION TECHNIQUE FOR COMPOUND CYLINDERS USED IN ARTILLERY PRACTICE.}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {83-88}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49915}, abstract = {This paper represents a computer aided study of the induced stresses in compound open ended cylinders subjected to high  internal pressures. A novel optimization procedure has been herein proposed with the objective of assigning compound cylinders wall thickness strength for maximum material utilization. Design charts are ,thus, provided to help in optimizing the selection of cylinders dimentions and material under a wide range of operating pressures.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49915.html}, eprint = {https://amme.journals.ekb.eg/article_49915_57275c132c1fccf3949eda0d7b6d0892.pdf} } @article { author = {El Kadeem, M. and El Dardiry, M. and Moussad, S.}, title = {A HEURISTIC PROJECT SCHEDULING APPROACH}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {89-104}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49922}, abstract = {This work documents a conventional heuristic project scheduling .approach for solving multiple resource-constrained project scheduling problems. Thus, the intent of this paper, is to demonstrate the design aspects of a suggested heuristic approach for resource leveling to projects scheduling under limited resource availabilities, The typical characteristics of the suggested heuristic procedure are:a- Resource leveling program utilizes the parallel approach.b- Multi-resource constrained with variable, resource availabilities.c- Make use of different priority rulesd- Possibility of activity splitting Test problem results are represented}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49922.html}, eprint = {https://amme.journals.ekb.eg/article_49922_79055e44ab23279d4b4e6a1806c16d5a.pdf} } @article { author = {EL BAKRY, M.}, title = {EFFICIENT METHODS FOR THE TRAFFIC ASSIGNMENT PROBLEM}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {105-114}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.49924}, abstract = {The capacity restrained traffic assignment problem is defined as "assign the vehicular traffic to different links of the network, given an origin-destination matrix for the traffic required between the nodes of the network, and a nonlinear relation for the travel time on each link as function of the traffic flow in that link ". The traffic is assumed to follow user's optimization according to Wardrop's principle, which states that the travel casts on all used pathes for each of the origin-destination pairs are equal and less than the travel cost on the unused pathes. This paper introduces four methods representing different approachs for solving this problem, the successive incremental assignment, Leblanc's model, a modified form of Leblanc's model and the method of negative loops. These methods are explained and compared with the help of an illustrative example.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_49924.html}, eprint = {https://amme.journals.ekb.eg/article_49924_ecf687d7938b9cfb1ec11055bbd74f24.pdf} } @article { author = {MOUSSA, A.}, title = {OPTIMIZATION OF STEPPED PART TURNING}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {115-121}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50308}, abstract = {The determination of the optimal cutting conditions for a stepped part is still one of the most difficult problems facing the production engineer. A computer program has been constructed to find the optimal cutting variables to minimize the production cost and to increase the rate of production and consequently the profit. The computer program is used to determine the optimum cutting variables for any number of steps and dimentions. These determined cutting variables can be applied for each step without changing the setting of the machine tool used.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50308.html}, eprint = {https://amme.journals.ekb.eg/article_50308_efb26d41394a319c93bcc8e712fb5a72.pdf} } @article { author = {KAMAL ELDIN, HAMED}, title = {ACQUISTION RISK ANALYSIS INTEGRATED SYSTEM}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {123-134}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50312}, abstract = {Over the years, there has been continuing cost growth in weapon system acquisition programs. Studies have been conducted to explain the causes of this cost growth. Risk and uncertainty is a common factor in major programs and it has been indentified as a significant cause of cost growth. It is apparent that cost growth can be reduced and controlled by specifically allowing and considering the risk involved. The purpose of this paper is to develop an no-going formal methodology for review and analysis to indentify and evaluate risks and uncertain-tites in technical, schedule, cost, functional performance and other categories of uncertainty at the different phases of the acquisition process and their interrelationships.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50312.html}, eprint = {https://amme.journals.ekb.eg/article_50312_e1b0a07628647fb3cf27d351aaee25b9.pdf} } @article { author = {MAKROUM, HANY}, title = {THE SINGLE-MACHINE MULTI-PRODUCT PROBLEM: NEAR OPTIMAL SCHEDULING}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {135-141}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50314}, abstract = {An iterative procedure is presented for determining near optimal production schedule in the single-machine multi-product lot sizing problem. The approach does not require equal lot sizes, and based on finding a feasible solution (lower bound).Two examples from the previous literature indicated that cancelling the restriction of equal lot sizes may provide achance for producing better solutions.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50314.html}, eprint = {https://amme.journals.ekb.eg/article_50314_977f79fec0b377574632325a0c1857df.pdf} } @article { author = {ZAKZOUX, M.}, title = {JOINT CALCULATION OP REORDER LEVEL AND REP-LENISHMENT ORDER QUANTITIES I4 INVENTORY CONTROL}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {143-146}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50320}, abstract = {For true optimum operation of reorder level policy of invetory control, reorder levels and replenishment order quantities must be calculated jointly. This is because the size of one quantity directly influences the size of the other in the overall reorder level inventory situation - Assuming that demand per unit time is distributed normally and leadtime is constant. From normal distribution table, as approximate relation between percentage probability (F) of stockout and a sefty stock of (k) standard deviation of demand during the leadtime is given. Using this relation in the total cost equation to calculate the stock-out term, we can get a direct value for replenishment order quantity and reorder level quantity which ensure the minimum COST required for optimum policy - An example is given to prove that this method proves the optimum solution rather that the one of separate calculation of the two parameters of this policy .}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50320.html}, eprint = {https://amme.journals.ekb.eg/article_50320_3b44172fa7a75b851622c96f87e2467d.pdf} } @article { author = {EL-ZAFRANY, A. and COOKSON, R.}, title = {ABSEA FINITE ELEMENT SYSTEM}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {111-121}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50323}, abstract = {ABSEA is a continually evolving modular suite of finite element programs that can, under the user control, be linked together by a simple command statement to produce a package tailored to the needs of the user. The system provides comprehensive solution facilities and a wide range of element types. It covers the static and dynamic analysis of structures with elastic, elastoplastic and viscoplastic materials. The system has a powerful interactive mesh generator. Modular, user-friendly data are employed and the results can be tabular or graphical. The ABSEA system which was designed and tested at Cranfield, has proved to be more efficient than some of the available well-known commercial packages.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50323.html}, eprint = {https://amme.journals.ekb.eg/article_50323_f3779f7cfbbb38839f6c2ec40c196043.pdf} } @article { author = {MOHAMED, SALAMA}, title = {A MODIFIED MATHEMATICAL MODELING IN GAS TURBINE COMBUSTORS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {123-133}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50333}, abstract = {Computation of the local flow structure, heat tranfer, and chemical species concentration in a two dimensional combustor of a gas turbine is described. The prediction is based on a modified TEACH computer program. A simulation of combustion of methne, the assumed fuel, is done in two major steps (C H4 ... C 0 + 2 H2 0 followed by C 0 + 1/2 02 ...C 02). In addition formation of other two dominant products, (NO) and (OH) is traced. Infleunce of some selected parameters, as air/fuel ratio, velocities ratio, diameters ratio on the performance of the combustor is demonstrated.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50333.html}, eprint = {https://amme.journals.ekb.eg/article_50333_6a7c0f64a495bb5a285da393e4516df3.pdf} } @article { author = {El Naggar, Mohamed}, title = {PRELIMINARY STUDY FOR THE INFLUENCE OF CONDENSATION DURING A PROJECTILE MOTION}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {135-146}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50334}, abstract = {This paper represents an initiation for studying the influence of change of phase of a water vapour-inert gas mixture that acts upon moving projec-tile in a barrel experimentaly sustained by theoretical model.In this study, the equations expressing the projectile motion and the change of state of the driving gas are analysed. In addition, the influence of boundary conditions is discussed. This is carried out for the purpose of determination of the calculation procedure which can be adapted in the case of two phase flow, if the condensation may take place by thearetical expectation. At the sametime,it is also to obtain the geomet-rical characteristics necessary for the construction of an experimental set-up for studying the condensation influences.It was found that the theoretical model expressing the projectile motion and the change of state of gas, proved its accuracy by comparison with experimental results. It is proved also that even in these particular conditions of gas expansion,the condensation of water vapour can take place. A conclusion that an increase of projectile velocity has been proved if the water vapour is added to the propelling gas}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50334.html}, eprint = {https://amme.journals.ekb.eg/article_50334_ae728c14830890d80fb7be95e7a284b1.pdf} } @article { author = {SAFWAT, H.}, title = {ON TEE ERROR ESTIMATION IN THE FINITE-DIFFERENCE ENERGY METHOD IN CONTINUUM MECHANICS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {147-156}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50555}, abstract = {The system of numerically algebraic equations resulting from FDE method for a class of Variational problems of the fourth order is represent ed by a differential equation with infinite terms. By using the perturbation. method for the solution of this differential equatioa, it has been found that the first order solution is an estimate of error in FDE method. This estimate has been determined for the :comparative study of three difference approximations and Illustrated by a model example.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50555.html}, eprint = {https://amme.journals.ekb.eg/article_50555_f79c924ba01a03902c39cba3783bc835.pdf} } @article { author = {SALEH, Ibrahim and RABIE, M.}, title = {THEORETICAL AND EXPERIMENTAL INVESTIGATION OF LEAKAGE FLOW IN GEAR PUMPS}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {157-162}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50560}, abstract = {The leakage losses in gear pumps, represent a special interest in engineering service. Herein, the prediction of leakage flow, as related to the pump geometry and fluid properties, has been assumed. Theoretical analysis has been developed to estimate the leakage flow through the side and radial clearances, during meshing process, and by squeezing of the trapped fluid. Theoretical and experimental analysis showed a satisfactory agreement between the estimated and the measured values.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50560.html}, eprint = {https://amme.journals.ekb.eg/article_50560_eb3b430082aa7b6aba343474d836a928.pdf} } @article { author = {Elaraby, M. and Hassan, G. and Farid, M.}, title = {STEADY STATE FORCE ANALYSIS OF FOUR WAY UNDERLAP HYDRAULIC SPOOL SERVOVALVES}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {163-172}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50564}, abstract = {The analysis of one of the common four way underlap hydraulic spool valve construction is presented. The flow force in the valve is deduced and used in building a steady state model for the valve based on the continuity and momentum equations.The flow damping coefficient is illustrated for differnt damping length ratios. The steady state flow force is discussed for different flow parameters. The effect of the spool valve parameters, the flow stiffness and the positioner spring rate on the valve performance are illustrated.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50564.html}, eprint = {https://amme.journals.ekb.eg/article_50564_99114e5c1eb30a6b97cce0b277e03c62.pdf} } @article { author = {Sallam, Tharwat and Soliman, Mahmoud and Mahmoud, Osama}, title = {Numerical and Experimental Determination of Jet Flow Behaviour Through Coaxial Flow Chambers}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {173-181}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50569}, abstract = {Two-dimensional aerodynamic coaxial flow chamber models are analized and compared with experimental results. Flow patterns, pressure and velocity profiles, jet entrainment and velocity fluctuations are experimentally investigated. Flow patterns are visualized by the tracer method. Two-dimensional mathematical models of coaxial flow type furnace are examined and aerodynamic characteristics are investigated analytically as well as experimentally. The flow entrainment in the jet mixing zone is investigated. The flow pattern is compared with that of the corresponding plane models, Numerical calculations using upwind-differencing iterative technique are carried out to determine the flow field behaviour. The computed results are found to be in fair agreement with the experimental measurements.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50569.html}, eprint = {https://amme.journals.ekb.eg/article_50569_0389740fe55116d856c50a448ad3d9fa.pdf} } @article { author = {MAKROUM, HANY}, title = {A PROPOSED COEFFICIENT OF SYMMETRY}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {183-187}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50573}, abstract = {Most frequency distributions obtained - in practice - from a limited set of readings are asymmetrical to a degree. Several measures of skewness(departure from symmetry) are available in the literature. Probably the most accurate and suitable for general use is the standardized third moment about the mean. In the literature,it is agreed that the third moment will be zero for a symmetric distribution, negative for skewness to the left and positive for skewness to the right. However,the third moment, can equal zero without the distribution being symmetrical. In other words, symmetry can not be expressed in terms of one or two moments - it requires an infinity of them. The proposed coefficient of symmetry presents the solution for this problem. For a distribution, if the proposed coefficient (ks) equals one then the associated distribution is perfectly symmetric. The values of ks less than unity indicate less symmetry.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50573.html}, eprint = {https://amme.journals.ekb.eg/article_50573_fa5066f111310c26c39a3741ff103f3d.pdf} } @article { author = {SHAMLOUL, M.}, title = {A NUMERICAL STUDY OF LAMINAR FLOW HEAT TRANSFER IN A POROUS ANNULI}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {189-196}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50577}, abstract = {The laminar flow of both fully developed and uniform entry velocity profiles in a permeable annuli was studied. The set of continuity, momentum and energy equations with its boundary conditions were solved numerically by computer program using finite difference method for a wide range of parameters. It was found from the numerical results that for the inlet parabolic velocity profile the axial velocity profile near the wall along the annuli increases due to suction and decreases due to injection. The axial pressure drop along the annuli with suction is smaller than it with injection. The local Nusselt number at the entry region increases due to suction and decreases due to injection through the inner wall of annuli.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50577.html}, eprint = {https://amme.journals.ekb.eg/article_50577_0b43acd89cfc544af3c6b6fd59510d8a.pdf} } @article { author = {KASSAB, M.}, title = {GEOMETRICAL CONSIDERATIONS EFFECT ON COMBUSTION CHAMBER PERFORMANCE}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {197-206}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50579}, abstract = {The performance of a combustion chamber and flame stability depend mainly on its geometrical design. It is important to create an anchored flame in a determined position which could be achieved by the creation of a recirculation zone. The recirulated flow is obtained utilising the combustor geometry. A simplified mathematical model is developped to corrlate the relation between the geometry and the recirulated flow in addition to the effect of other parameters such as in 8 jection methods and temperature inside the combustion zone. Using the cold flow simulation and visualization methods the flow structure at different positions could be traced. Quantitive visualization measurements are used to estimate the flow in the recirulated zone. A comparison between the theoretical results and experimental measurements shows an acceptable coincidence.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50579.html}, eprint = {https://amme.journals.ekb.eg/article_50579_a18dee97e66af770c58fe05624ba95d3.pdf} } @article { author = {NAGI, H.}, title = {THE USE OF COMPUTER TECHNIQUES IN SURFACE TEXTURE ASSESSMENT}, journal = {The International Conference on Applied Mechanics and Mechanical Engineering}, volume = {2}, number = {1st Conference on Applied Mechanical Engineering.}, pages = {207-229}, year = {1984}, publisher = {Military Technical College}, issn = {2636-4352}, eissn = {2636-4360}, doi = {10.21608/amme.1984.50582}, abstract = {The work represents a successful attempt of using a computer technique in surface texture assessment for metallic surfaces A computer - Talysurf system composed of a PDP-8/L computer in connection with Talysurf 4 was employed in the analysis of surface profiles. The performance of the Computer-Talysurf system was checked by looking into the consistency of the output reading compared with the expected values according to the loading computer program.A loading program to the PDP-8/L computer was used the computer to register of the surface ordinates arbitrary datum line at certain sampling interval for changing the sampling interval and the number registered ordinate heights was made.A 1904 code Algol processing computer program was and used for analysing the characteristics of the surface profiles.For ground surfaces, by using a sampling interval of 1.219 micron and a number of ordinates equals 3000, it was found that the computed value of the surface center line average equals to yhat given by the Talysurf, and the cumulative distributions of the surface peaks and ordinates were gaussiaa as expected. Finally, a picture of a surface profile obtained from the computer output compared with the surface profile obtained from the Talysurf is presented. The operating procedure of the Computer-Talysurf system and the computer program are not included for space limitations.}, keywords = {}, url = {https://amme.journals.ekb.eg/article_50582.html}, eprint = {https://amme.journals.ekb.eg/article_50582_c9a2f37ff1ef364069980664394609da.pdf} }