Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401MULTICRITERIA GROUP DECISION MAKING BASED EXPERT SYSTEM: FRAMEWORK187246110.21608/erjm.1998.72461ENAhmed A.ElsawyBasic Engineering Science Department, Faculty of Engineering,
Menoufia University, Egypt.Waiel F.Abd El-WahedBasic Engineering Science Department, Faculty of Engineering,
Menoufia University, Egypt.Journal Article20200220This paper presents a framework of a decision support system (DSS) <br />with multicriteria group decision making (MCGDM) using both <br />mathematical programming and expert system (ES). The study indicates the <br />implementation of multicriteria techniques through group decision making in <br />DSS. The main advantage of this framework is the combination of both the <br />mathematical programming and expert system in a hybrid approach to <br />achieve the interaction between the solution procedure and decision maker <br />through group decision making.https://erjm.journals.ekb.eg/article_72461_77c056afff326c8d883775608cc70143.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401FATIGUE BEHAVIOUR OF AL-12 % Si/SiC, COMPOSITE PRODUCED BY SQUEEZE CASTING TECHNIQUE9207246410.21608/erjm.1998.72464ENA. M.ABO EL-AINENEProd. Eng. & Mach. Design Dept., Faculty Of Engineering ,
Menoufia University Shebin El-Kom, Egypt.Journal Article20200220In the present work, the fatigue behaviour of a- 12% SiISiC, <br />composite containin (10% wt) Sic, particles have been compared with Al- <br />12% Si alloy. Dis f ocation structure and microprocesses of fatigue crack initiation and propagation in the composite have been investigated using SEM and TEM. The cyclic stress res onse characteristics and fkacture <br />behaviour of the composite were7also stu a ied. The obtained results showed <br />that the fatigue stren h at 10 cycles of the com osite is 1105 MP,, i.e. <br />about 28.6% higher t ff an matrix alloy. The voids an d' microcracks initiated <br />at and near the interface between Sic, and matrix, where the higher density dislocations are presented, will propagate and link up to form the fatigue crack. Cyclic response of the composite revealed hardening to failure at all <br />strain amplitudes. The fatigue fracture sf the composite exhibits a <br />macroscogical~y brittle characteristic at dl strain amplitudes, but has local matrix ductility.https://erjm.journals.ekb.eg/article_72464_3299b1b98527ef782053db3b58628a0d.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401FATIGUE BEHAVIOUR OF AL/SiC FIBERS COMPOSITES PRODUCED BY SQUEEZE CASTING TECHNIQUE21307246610.21608/erjm.1998.72466ENA.M.ABO EL-AINENEProd. Eng. & Mach. Design Dept., Faculty Qd Engineering ,
Mensufia University Shebin El-&m, Egypt,Journal Article20200220In the present work, the fatigue behaviour of pure aluminium <br />reinforced with Sic fibers composite has been investigated. The composite <br />was fabricated by squeeze casting technique with different values of fibers <br />volume fraction Vf. Rotating bending fatigue test was used to compare the <br />fatigue strength of the composite with matrix material. Fatigue fracture <br />hrfaces of specimens were investigated by macroscopic and SEM <br />observations. <br />The influence of volume fraction of fibers on the fatigue life was <br />discussed. The obtained results showed that, in comparison with pure <br />aluminium, the fatigue strength at 10' cycles of the composites is superior <br />by 9 1.3% and 90.2% fbr Vf = 45% and Vf = 3 5% , respectively. Fatigue <br />crack does not propagate along the fibers-matrix interface, he propagates <br />in the matrix. The fatigue strength ratio of Sic/& composites indicated <br />about 0.71.https://erjm.journals.ekb.eg/article_72466_4242fa01e2cc2beb47b40376f850978c.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401جهد المقل العامل في تنقيح المعجم الوير الشامل للمصطلحات الفنية للهندسة والتکنولوجيا والعلوم31527275510.21608/erjm.1998.72755ENJournal Article20200222<br /><span>تعريب مصطلحات العلوم والتقانات والفنون في التعليم العالي والبحث العلمي فريضة وضرورة. والعربية</span><br /><span>لغة فريدة في تراکيبها واشتقاقاتها، جميلة في کسها، عذبة في نطقها، ولا غرو فهي لغة القرآن الکريم ولغة الفائزين</span><br /><span>بالنعيم المقيم في جنات رب العالمين. وقد سبق لأمة العرب ومن آمن بالمصطفى * من أمة العجم أن کانوا إلى المعالي</span><br /><span>سابقين، ومن ناصية العلوم والفنون متمکنين، حتى إن البعوث من أوروبا کانت تستنهض إلى بلاد الإسلام لتستفي</span><br /><span>من نبع المعرفة الصافي الذي استمد قوته وعذوبته من تعاليم الإسلام، يوم کانت هذه التعاليم الهيمنة الکامل على</span><br /><span>القلوب والجوارح.</span><br /><span>وقد کان الاتحاد المهندسين العرب فضل التنادي إلى إصدار مغجم موخير شامل ا</span><br /><span>للمصطلحات العلمية</span><br /><span>والفتية يتم الله به شغث العلماء والباحثين والدارسين في شرق بلاد الأمة العربية وغربها، وکان المؤسسة الکويت</span><br /><span>للتقدم العلمي فضل الوفاء بمتطلباته المادية والإشراف على إصداره. ولقد يسر الله تعالى صدور المعجم الوځ</span><br /><span>الشامل للمصطلحات الفنية للهندسة والته و في أحد عشر جزء استغرقت ما يقارب 5500 صفحة</span><br /><span>والعجم الوځ عمل کبير من</span><br /><span>نقص، إما لقصور في تنفيذ خطة إخراجه ومنهج إنشائي، وإما لک السنين علي</span><br /><span>وقد مضي على صدوره عشر سنوات</span><br /><span>تغير فيها وجه کثير من ا</span><br /><span>العلوم الحديثة ومصطلحاتها، بل صار العصر کله</span>
<span><span>للتقدم العلمي فضل الوفاء بمتطلباته المادية والإشراف على إصداره. ولقد يسر الله تعالى صدور المعجم الوځي</span><br /><span>الشامل للمصطلحات الفنية للهندسة والتکنولوجيا و العلوم في أحد عشر جزء استغرقت ما يقارب 5500 صفحة</span><br /><span>والمعجم الموحد عم کبير لم يخل من نقص، إما لقصور في تنفي خطة إخراجه ومنهج إنشائي، وإما لک السنين عليه</span><br /><span>وقد مضي على صدوره عشر سنوات تقريبا تغير فيها وجه کثير من العلوم الحديثة ومصطلحاتها، بل صار العصر کله</span><br /><span>يوصف بوصفي لم يکن لفظه قبل عقدين من الزمان معروفة، ألا وهو وصفه بعصر المعلومات Informatics</span><br /><span>.Age</span><br /><span>O</span><br /><span>والبحث الذي بين أيدينا هو حصيلة ما يزيد على العامين من العمل الشاق - دون تکليف من بشر - في</span><br /><span>تنقيح هذا المعجم النافع وتصويب أخطائه العديدة التي تزيد على 10% من مجموع مواده. وقد عضدت هذا العمل</span><br /><span>خبرة عشرات السنين من التدريس في الجامعات والدراسة بها، بالإضافة إلى التطفل على مآدب أساتذة علوم القرآن</span><br /><span>وفقهاء اللغة. نسأل الله تعالى أن يجعل هذا العمل نافعة لأمتنا، وأن يجعله خالصا لوجهه تعالى، إنه سبحانه الجواد</span></span>https://erjm.journals.ekb.eg/article_72755_35658ddd777bb349cc7d2353085765a1.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401Optimizing Feedback Coefficients Of A Practical Synchronous Generator Nonlinear State Observer Using Additional Signals53697246910.21608/erjm.1998.72469ENH. A.Nour EldinGroup of Automatic Control and Technical Cybernetics, University of Wuppertal,
GermanyF.FischerGroup of Automatic Control and Technical Cybernetics, University of Wuppertal,
GermanyA. M,Abdel-HamidDepartment of Electrical Engineering, Faculty of Engineering, El-MonouJia University,
Shebin El-Kom, Egypt (Since 1996 on leave for Post-Doctoral visit at the University of
Wuppertal, Germany)Journal Article20200220Synchronous generators are characterized by a nonlinearly interacting electrical and <br />mechanical dynamics. Accurate and robust state reconsh-uction of this machine by an <br />observer should be based on its nonlinear dynamic behavior to avoid intolerable errors. The <br />authors of this paper had published a methodical design of a fill1 order nonlinear observer for <br />turbogenerator systems and organized its experimental validation on a 120 MVA and 1000 <br />MVA synchronous generators at Gud-Power Station in south Munich (Germany) and the <br />Nuclear Power Station of Gosgen (Switzerland), Measured results from these power stations <br />have proved a quite effectiveness of the proposed methodology on getting a stationary robust <br />state reconstruction. However, some transient results are characterized with state <br />oscillations. To prevent such transient oscillations, this paper introduces an optimum <br />technique for the selection of the observer feedback constants. Moreover, additional signals, <br />such as real, reactive and apparent power as well as the amplitude of the stator current are <br />used for the observer feedback. These signals have proved to enhance damping of the <br />observer states transient oscillations.https://erjm.journals.ekb.eg/article_72469_a8147359f9b5523fb2e2c33d78e6dd7b.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401A microprocessor-based Load voltage control using an AC chopper71897301810.21608/erjm.1998.73018ENA.S.ZEIN EL DINdepartment of Electrical Engineering, Faculty of Engineering, Menoufia University,
Shebin El-kom, Egypt.Z.MOHAMEDdepartment of Electrical Engineering, Faculty of Engineering, Menoufia University,
Shebin El-kom, Egypt.A.A.EL-HEFNAWYdepartment of Electrical Engineering, Faculty of Engineering, Menoufia University,
Shebin El-kom, EgyptA.S.ABDEL-GHAFARdepartment of Electrical Engineering, Faculty of Engineering, Menoufia University,
Shebin El-kom, EgyptJournal Article20200223Pulse width Modulated (PWM) control technique for an a-c choppers using harmonic <br />elimination method is proposed. The firing switching instants of a-c chopper for the <br />proposed technique is derived theoretically. By using a microprocessor as a controller, <br />makes it possible to store the firing switching instants time as a look-up table for different <br />load voltage values. Two MOSFET's are used as an a-c chopper. Experimental results <br />verifying the simulation analysis of the a-c chopper fed static (R-L) load and dynamic load <br />(1-ph. induction motor). The proposed strategy is low cost, simplified, and control <br />effective.https://erjm.journals.ekb.eg/article_73018_0b02e9ccedb2fb27c2cd8cc6e4b81fbd.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401A THEORETICAL STUDY OF A THERmOSYPHON SOLAR TOWER911047302310.21608/erjm.1998.73023ENA. A.El-harounMechanical Power Eng . Dept., Facluty of Engineering, Menoufia
University, EgyptJournal Article20200223Thermosyphon solar tower can be used to increase the vehcit.y of <br />air and consequently the specific power in locations with <br />reasonable value of sdar radiation intensity when there ip a no <br />enough area beside the tower to construct a solar collector. In <br />this case the tower itself works as a collector. In this work the <br />possibility of generating power by using a very high tower, <br />haviing reciafiyula~ CLUSS section, open to the atmosphere at the <br />top and bottolri and heated by the uur;, was studied theoretically. <br />In this study, the eEect uf tower height, IJJW~L leugth, tower <br />dep~h, suldr radiatiori intensity ard inlec. ~AL I~~tlgerature orr tile <br />performance ui lie tower wab LLL vtisi;;cpL;;LZ. <br />It was found that, the temperaf:.ure inside the tower increases by <br />the irlcreaue in sular. radiaLir)n ia.r.Lein&.y, id& uir ierr~perature and <br />tower height and decreases by the rise in tower length as well <br />as in tower depth. The iibt ate vdociLy tcl tLa towex and <br />consequently specific power was found to be x..aised by the <br />growth in. tower height and scllar radiiitien intensity, and it is <br />found to be decreased by the enlargement in tower length, tower <br />depth and temperature of air at the inlet of the kower. The inlet <br />air velocity and the specific power for tower height of 500 in <br />were found LO La 5.2 &rid 141 times d their values ~OK 56 111 <br />towef- height respectively. For solar radiation intensity of 1000 <br />W/ni , the inlet air we1uc:ity anti the specific puueL a~ti cyected <br />to Le 1.32 and 2.28 times of tiieir vdlues fur 200 W/m solar <br />radiation intensity respectively.https://erjm.journals.ekb.eg/article_73023_4d761f2cf783e015525dd532ed4ca46f.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401Flow Past a Grooved Circular Cylinder1051197302510.21608/erjm.1998.73025ENGamal H.MoustafaMechanical Power Engineering Dept.
Faculty of Engineering
Menoufia University, Shiben El-Kom
EGYPTA. M.Alam El-dinMechanical Power Engineering Dept.
Faculty of Engineering
Menoufia University, Shiben El-Kom
EGYPTJournal Article20200223An attempt is made to clearly distingxish the effect of a groove shape on <br />the aerodynamic characteristics of a circular cylinder. The grooves are <br />used as a passive control for the boundary layer separation. Grooves of <br />different cross section shapes are made on the cylinder surface to <br />investigate the effect of a regular surface configuration and to elucidate <br />the flow structure in the wake region where the effect ofgrooves is <br />existed. The results show that the grooves greatly affect the location of <br />the separation point in which a shift of the flow regime to lower Reynolds <br />number is found. The subcritical, critical and supercritical regimes can <br />easily identified from flow measurements. It is found that the critical <br />Reynolds number for tested grooved cylinders is 5x10~ which are below <br />the subcritical Reynolds number of a smooth cylinder. The critical <br />Reynolds number for a smooth cylinder is 3x10'. The main features of the <br />boundary layer development are quit the same as that of the smooth <br />cylinder. The boundary layer thckness and shape factor are large for <br />grooved cylinders compared to that of the smooth cylinders and these <br />results are in good agreement with previous available data.https://erjm.journals.ekb.eg/article_73025_07e1730a00c3172ec901f95220bd7f83.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401Modeling and Simulation of the Shape Error in the ECM Process1211397303510.21608/erjm.1998.73035ENK. P.RajurkarNontraditional Manufacturing Research Center
Industrial and Management Systems Engineering Department
University of Nebraska-Lincoln, Lincoln, NE 68 5 88W. H.LiuNontraditional Manufacturing Research Center
Industrial and Management Systems Engineering Department
University of Nebraska-Lincoln, Lincoln, NE 68 5 88B.WeiNontraditional Manufacturing Research Center
Industrial and Management Systems Engineering Department
University of Nebraska-Lincoln, Lincoln, NE 68 5 88M. S.HewidyVisiting from Menoufia University, EgyptJ.KozakVisiting from Warsaw university of Technologyz PolandJournal Article20200223Accuracy in ECM is still a problem that restricts the application of <br />this technology for accurate applications. The present investigation submits a <br />theoretical and experimental study about shape error in the ECM process which <br />has not been attempted before. Feed rate, applied voltage, electrolyte <br />conductivity and initial gap size have been considered the main factors affecting <br />the shape error value (sometimes reached 40 p1 for a 40 mm workpiece <br />length). Experimental results have been found to agree with the estimated values <br />with a difference less than 0.01 mm. The present results emphasize the <br />importance of the consideration of the shape error factor for accurate tool <br />design and shape predictionhttps://erjm.journals.ekb.eg/article_73035_8b4cc377def719fc71e4de1dae8bd70f.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401TEXTILE FIBERS AS A REINFORCEMENT FOR ASPHALT CONCRETE MIXTURES1411537303810.21608/erjm.1998.73038ENSaadEl-HamrawyFaculty of Eng., El-Menoufia Uni.Abou El HassanRahilFaculty of Eng., El-Menoufia Uni.Journal Article20200223Growing road traffic has created the need of pavement structures which can <br />adapt to this evolution. Concurrently, surfacing techniques have moved in the <br />same direction to ensure user comfort and safety. Also, to resist the high <br />deformation caused by these high loads. <br />Stone-Mastic-Asphalt-mixtures (SMA) have been developed in Germany since <br />1984, and another mixtures were developed in France. <br />In this investigation, a comparative study was made between SMA and <br />mixtures produced using coarse gradation 3B, according to the specs of RBA . <br />Also, a comparison was made between the two last mixtures and -the most <br />common mixture in Egypt- the dense gradation 4C. <br />It was concluded that the coarse gradation mixtures must be used with <br />additives to increase the Marshall stability and to improve the tensile strengthhttps://erjm.journals.ekb.eg/article_73038_1eb06235e37c05d4e09d2b4aee1028c0.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401A NEW LOOK FOR SERIES COMPENSATION OF ELECTRICAL NETWORKS CONSIDERING VOLTAGE COLLAPSE1551687304110.21608/erjm.1998.73041ENSobhy M.FarragFaculty of Engineering
El-Menoufiya University, EgyptJournal Article20200223The paper presents a new look for allocating controlled variable <br />series compensation in electrical transmission networks from the view points <br />of voltage collapse, capacity of transmission, and transmission losses, For <br />more realistic and accurate representation, the load is manipulated as a state <br />variable and voltage dependent throughout the solution process. The solution <br />algorithm searches for the optimal line to be compensated and ratings of series <br />capacitive compensation in order to increase capacity of transmission, enhance <br />voltage stability margin, define voltage collapse point, and finally identifjr the <br />most sensitive and vulnerable nodes in the network.https://erjm.journals.ekb.eg/article_73041_21743a95663a4638b2d61aac94ecb399.pdfMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118021219980401EFFECT OF TEMPERATURE ON THE BEHAVIOUR OF ASPHALTIC CONCRETE MIXTURES UNDER REPEATED Lams1831977304910.21608/erjm.1998.73049ENSuad A.El-HamrawyFaculty of Eng Menoufia Uni.
Shebin El-komJournal Article20200223In the recent years an important trend has been established towards <br />the use of heavier highway md aircraft wheel loading. The high axle <br />loads lead to excessive permanent deformation in asphalt pavements, <br />especially at high temeratures in hot regions. <br />The main objective of this research is to study the effect of test <br />temperatures on the creep behavior of asphalt concrete mixtures. <br />Dynamic creep test was used for this purpose. Creep strain, mix <br />stiflkess modules and rate of deformation were obtained as a function <br />of axial applied stress and/or test temperature. <br />It is concluded that the creep strain, rate of deformation 'and mix <br />stiffness modules depends upon the bitumen stifhess, and influenced <br />proportionally by variation of test temperature.https://erjm.journals.ekb.eg/article_73049_5d93b5184a3247d725845078a15a03dc.pdf