Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401A FUZZY LOGIC-BASED LOAD FREQUENCY CONTROLLER1167100010.21608/erjm.2001.71000ENA. M.Abdel-HamidAssistant Prof:, Department of Electrical Engineering, Faculty of Engineering, ElMonoufia Universiiy, Shebin El-Kom (32511), Egypt.Journal Article20200213The we0 known and widely used power system model for the Load <br />Frequency Control (LFCj problem is extremely linearized and approximated Over the,last <br />three decades, extensive research efjorts have used such a model as a base for studying <br />several control schemes in thisjeld Unfortunately, documented reports have proved that <br />there exist many power systems worldwide sufjering from severe load-/requency <br />jluctuations. Beside approximation and linearization, the uncertainty of the model <br />parameters may consrittrte the main reasons of LFC failure. Unlike common control <br />schemes, this paper presents a Fuzzy Logic-Based Load Frequency Controller. A. Variable <br />Structure Fuzzy Controller (VSFCj will be developed to suite the power syslem ntodel for <br />both wide range of parameter uncertainties and different types of disturbances. The <br />performances of the proposed VSFC are compared with a conventional-LFC for a variety <br />of system parameters and transient disturbances. This may highlight the effectiveness of <br />the proposed controller not only solving the LFC problem but also in providing sufficient <br />damping of the frequency oscillatiows. Another important objective of this paper is that it <br />presents an easy tutorial to demonstrate the use of readily available computer <br />sofiare(MATUB, SIMULINK, and Fuzzy Logic Toolboxj in the analysis and design of <br />Load Frequency Control systems.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401Numerical Simulation of Shock Wave Interaction with a Slab of Compressible Foam Attached to a Solid Wall17387100710.21608/erjm.2001.71007ENAhmed A.SileemMech. Power Eng. Dept., Faculty of Engineering
Menoufia University, Shebin El-Kom, EgyptJournal Article20200213Numerical simulation of normal shock wave interaction with a slab of <br />compressible foam attached to a solid wall is the scope of the present work. <br />The foam is modeled as solid particles suspended in air. Therefore, the fo& is <br />treated as two-phase medium of solid particles and air. The drag force and heat <br />transfer between particles and air are taken into consideration. The influerice of <br />foam density, incident shock Mach number and foam slab length on the <br />reflected and transmitted waves strength, on the flow field inside and outside <br />the foam and also on the pressure at solid wall behind the foam are studied. <br />The numerical results reflect all the salient features of the interaction process <br />and its conseauences. The results of the present numerical simulation are <br />compared wi& experimental results of ~kews[1991] and showed a satisfactory <br />agreement. It is shown that the effect of increasing foam length is to delay the <br />arrival of the transmitted wave to the solid wall and the rna~mum pressure at <br />wall increases slightly. In addition, the rate of wall pressure increase is greater <br />for smaller foam length. The increase in incident shock Mach number increases <br />the wall pressure and the rate of increase is greater for greater incident Mach <br />number. The pressure at the wall decreases after reflection to almost constant <br />value in the used tune span. This constant value increases with the increase in <br />incident Mach number. The numerical results showed also that the delay in the <br />arrival of transmitted wave to the solid wall is greater for greater foam density. <br />The maximum pressure at the solid wall decreases with the increase of foam <br />density, but it decays to almost constant value regardless of the foal density. <br />The maximum pressure at wall with foam attached to it considerably exceedsMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401A UNIFIED INTERACTIVE APPROACH FOR SOLVING MULTIPLE CRITERION NONLINEAR INTEGER PROGRAMMING PROBLEM39537101110.21608/erjm.2001.71011ENMahMoud ZakiRagabprofecssor of Mathematics and Vicc - Dcan for higher Studies Faculty of Science,
Zagazig University.Ahmed AEl-SawyProfessor Of Mathcrnatics, Dcpartmcnt of Enginccring Basic Science, ~ac& of
Enginccring, Mcnufia Univcrsity.Hanan M.Abd El Rahrmanteaching Assistant, Department of Basic Engineering Science, Higher Technologjcal
lnstitutc, Tenth of Ramadan City.Journal Article20200213This paper introduces a uniiied interactive approach for solving multiple <br />criterion nonlinear integer programming problems. The proposed algorithm <br />collects the characleristics of four interactive approaches. These approaches are <br />stem, trade off cutling plane, (GDF) procedure, and Tchebycheff procedure.This <br />papcr presents a combined interactive approach between stem and trade off cutting <br />plane methods, a combined interactive approach between GDF and Tchebycheff <br />p~occdurc will also bc introduced Finally, the paper also presents a proposed <br />algoliihn~ for a unilicd approach to solvc ilic multiple - criterion nonlinear integer <br />programming (MCNLIP) problems which combines the characteristics of both the <br />combined approachesMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401NUMERICAL METHOD FOR THE SOLUTION OF NONLINEAR BOUNDARY-VALUE PROBLEMS55677101310.21608/erjm.2001.71013ENHamza M.HabibDepartment of Basic Engineering Sciences
El-Menoufia University
Shebin El-Kom, Egypt ,Mohamed Magdy M.El-FarrashDepartment of Basic Engineering Sciences
El-Menoufia University
Shebin El-Kom, Egypt ,Mohamady A.BasiounyDepartment of Basic Engineering Sciences
El-Menoufia University
Shebin El-Kom, Egypt ,Journal Article20200213A simple, efficient numerical solution method for nonlinear <br />boundary value problems is presented. The approach depends on <br />linearizing the finite-differenced equations for the dependent <br />variables then solving the correction equation for the dependent <br />variable by the tri-diagonal matrix method, finally correcting the <br />solution at each iteration. The method is somewhat similar to <br />Newton's method in that the Jacobian is evaluated at each iteration,Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401A Fuzzy Multilevel Mathematical Programming85967101510.21608/erjm.2001.71015ENM. Abdel- AatyMaatyFaculty of science, Cairo University, Fayuom Branch, Egypt,Journal Article20200213nus paper gives an overview 011 a technique for solviug siigle objective <br />or nlu~tiobjective mathematical programmillg with hzzy parameters in the <br />objective functions, under the presentation of multi- decision makers in differeut <br />hierarchy level (decentralized decisio~~ making situation); where the higher level <br />UI the luerarchy can only i~duence aprather tlm dictate the choices of the lower <br />level.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401Power Quality Analysis at Pumping Stations Network In Egypt971127101810.21608/erjm.2001.71018ENRadwan H.Abdel-HamidFaculty of Engineering,
Helwan UniversityMohamed A.HelalMechanical and Elect. Research Ins.
National Water Research CenterSobhi M. AhmedFarragFaculty of Engineering, Monofia, B
UniverstyAshraf M.ElsotohyB.Sc, research Assistant,
Mechanical and Elect. Research Ins.Journal Article20200213This paper aims mainly to implement the power quality isspes and <br />impact on the pumping stations networks supervised by the ministry of Water <br />Recourses and Inigation in Egypt. The paper outlines the strategy of monitoring <br />the power system disturbances at these stations with special emphasis on those <br />disturbances influencing the performance of the pumping units. Because the <br />pump stations network is large (more than 1500 pump stations) with different <br />hydraulic load nature, this paper adopted a pilot project to conceive the power <br />quality study. Two large pump stations are selected for this study at two <br />different locations. The rating of the pumping units ranges between 475 kW and <br />1 MW for each unit at an operating voltage ranges between 6.6 kV and 11 kV. A <br />special diagnosis system is described and installed at the selected pilot pump <br />stations for long periods to cover the seasonable load system at these stations. <br />Based on that svstem a com~rehensive data of unpredictable disturbances are <br />recorded, examined and analyzed to clarify the power quality picture at the <br />selected stations. This study also includes the lack of industry standards and <br />performance behavior of the drive motors at the pumping station network. <br />Problems conducted for investigation included all type of voltage disturbances <br />such as voltage surges and impulses, voltage sags, harmonic invasion, <br />flickering, and P.F quality. It is hoped that this study will be of special benefits <br />to the Ministry and other private sectors growing now in the field of cultivated <br />iandsMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401CONDENSATION COEFFICIENT AND WETNESS THERMAL LOSSES OF WET STEAM FLOW AT LOW PRESSURES1131337102210.21608/erjm.2001.71022ENN.H.MAHMOUDDept. of Mech. Power Engng.,
Menoufia University, Shebin El-Kom, EgyptJournal Article20200213Condensation coefficient of wet steam flow at low pressures has been <br />evaluated theoretically. It was found from the theoretical results th&t wet <br />steam condensation coefficient depends upon: the pressure at ~ilson <br />point, vapour supercooling, droplet sue, evaporation coeffkieht' and <br />.4 index of isentropic expansion. <br />Available data on the condensation coefficient of wet steam flow <br />through nozzles are found to be dependent on the pressure values of both <br />initial flow conditions and Wilson point. A comparison has been <br />conducted between the present values of the condensation coefficient and <br />that reported and required to minimize the difference between the <br />predicted and measured pressure distributions in wet steam flow through <br />nozzles. The agreement in the comparison is good. In order to verify the <br />model, another comparison between a measured pressure distribution <br />and a predicted one through a nozzle based on selected values for the <br />condensation and evaporation coefficients is also carried out. 'The quality <br />of agreement in this comparison is good. <br />Moreover, entropy increase due to the irreversibility of heat and mass <br />transfer proceses in wet steam has been estimated numerically. The <br />numerical results show that increasing the condensation coefficient, <br />droplet size and expansion rate as well as decreasing the evaporation <br />coefficient tends to increase the wetness thermal losses during wet steam <br />flow.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401EIGENSOLUTION OF NONCLASSICALLY DAMPED ASYMMETRIC VIBRATION SYSTEMS1351537102310.21608/erjm.2001.71023ENElSayed M.ElBeheiryDepartment of Production Engineering and Mechanical design,
Faculty of Engineering, Menoufia University,
Shebin ElKom, Egypt .Journal Article20200213This paper presents a new effective approach to solving the generalized <br />eigenvalue problem Bu =Mu by using a perturbation technique. A <br />generalized second-order perturbation theory is adapted such that the perturbed <br />solution will be based on the eigensolution of an unperturbed subproblem <br />describing the conservative part of the original nonclassically, viscously <br />damped system with asymmetric mass, damping and stiffness matrices. Two <br />numerical examples in addition to a practical problem are studied to show that <br />tk eigensolutions obtained by the current method match, to a great ex?ent, <br />so!utions obtained by time-consuming exact methods.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401THE INTEGRATION OF COMPUTER-MEDIATED COMMUNICATION AND INFORMATION TECHNOLOGIES IN HIGHER EDUCATION1751887102510.21608/erjm.2001.71025ENMohammad OthmanALNaisHail College of Technology, P.O. Box 1690, Hail, Kingdom of Saudi ArabiaJournal Article20200213Universities and colleges offer students the opportunity to grow intellectually <br />and creatively through the advanced study of science, engineering and <br />literature. As modem workforces require well-motivated individuals with the <br />skills and adaptability to meet the demands of an ever more competitive world <br />market for quality products, the govcrnment of the Kingdom of Saudi Arabia <br />(KSA) wants to see a successful and inclusive society, with a competitive <br />economy built on the talents and skills of all. <br />The idea that technology is changing the way we work and learn has become a <br />constant refrain in contemporary society. Thus, universities and higher <br />colleges look to modem technologies to help solve problenls that have <br />inhibited learning in the past. Another challenge to institutions of higher <br />education with regard to professional development in areas of technology is <br />the mere fact that students of tomorrow will be more dependent on technology <br />skills than the students of today. <br />Taking up the idea that educational technologies have the potential to alter how <br />universities and higher colleges are run and how students learn. This paper <br />addresses how to encourage widespread effective use of new technologies in <br />teaching, learning and research in all educational institutions and all subjects to <br />ensure that students are able to use new technologies to enhance their learning <br />and prepare for working life.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401EFFECT OF COOLING RATE DURING .. CENTRIFUGAL CASTING ON THE CREEP RUPTURE STRENGTH OF 13% Cr STEEL1891987102910.21608/erjm.2001.71029ENMohamed O.ALNAISCollege of Technology at Hail, KSAJournal Article20200213It is well known that 13% Cr steel is one of the most economic stainless steels. <br />It is, however, inferior to austenitic stainless steels in creep rupture strength <br />above 600' C. <br />Therefore, an attempt has been made to imprive the creep rupture, strength of <br />13% Cr steel. This work is principally concerned with the investigation of the <br />influence of the cooling rate during centrifugal casting on the creep rupture <br />strength of 13% Cr steel. <br />The results obtained are summarized as follows: <br />- The creep strength of 13% Cr steel is improved by increasing <br />cooling rate during centrifugal casting. <br />- The higher cooling rate promotes: large sizes of columnar structures <br />and fine dispersion of precipitates. These are shown to have a <br />beneficial effect on the creep strength of 13% steel.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401EFFECT OF NOTCH SENSITIVITY ON FATIGUE STRENGTH AND FATIGUE CRACK BEHAVIOUR OF Ti-6AL-4V ALLOY1992107103010.21608/erjm.2001.71030ENJournal Article20200213In the present work, rotating bending fatigue tests have been carried <br />out to investigate the fatigue strength of plain and circumferentially <br />notched specimens of Ti-6AL-4V alloy. The purpose of this work is to <br />evaluate fatigue strength and notch sensitivity under different stress <br />concentrations . The notch radius of specimens changes from m (plain <br />specimen) to 1.3, 0.4, 0.2, and 0.1 mm. The fatigue cracks initiate by <br />approximate 25% of cycle ratio in the cases of p= 1.3 and 0.4 mm while <br />the fatigue cracks initiate by approximate 15% in the case of p = 0.2 <br />mm. The notch sensitivity of Ti-6AL 4V alloy is higher Ahan that of <br />cast iron, and lower than that of steel material. The non-propagating <br />micrwcracks at the specimen surface are not existed for not only the <br />plain specimen but also for all of the notched specimens including plain <br />specimen under fatigue limit by N = 1 X 10' cycles.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401Investigation into the Effect of Switching Frequency on the Performance of Current Controlled Inverter Employing Space Vector Modulation Technique2112267103610.21608/erjm.2001.71036ENF.M.EL-KhoulyDepartment of Electrical Eng., Faculty of Eng.., Menoufia University, Sebin El-Kom, Egypt
Electrical engineer at AI-Ezz steel rebars company.Y. K.EL BehirYDepartment of Electrical Eng., Faculty of Eng.., Menoufia University, Sebin El-Kom, Egypt
Electrical engineer at AI-Ezz steel rebars company.M. E.ELShebinYDepartment of Electrical Eng., Faculty of Eng.., Menoufia University, Sebin El-Kom, Egypt
Electrical engineer at AI-Ezz steel rebars company.A. SAbdel-GhaffarDepartment of Electrical Eng., Faculty of Eng.., Menoufia University, Sebin El-Kom, Egypt
Electrical engineer at AI-Ezz steel rebars company.Journal Article20200213In this paper the effect of switching hquency on the performance ofthe space <br />vector modulation (SVM) current controlled three-phase PWM inverter loaded by <br />interior permanent magnet synchronous motor (IPMSM), is investigated. The effects <br />of the switching frequency on the stator space reference voltage vector V. 0) and <br />then on the inverter operation modes are investigated. The idea of event driven <br />indicative flag that on-line indicates the inverter mode of operationis presented. <br />Computer simulation to compare the SVM performance at different switching <br />ikquencies is developed. Effects of changing the inverter dc link voltage, reference <br />speed and mechanical load torque on the inverter modes of operationhave been <br />presented.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024220010401The Effects of Waste Recycling on The Employees and The Environment ..2272397104010.21608/erjm.2001.71040ENMohammed O.AlnaisCollege of Technology at Hail, Hail, Saudi ArabiaJournal Article20200213<br />The subject of "waste" has become a very important topic and is really a big <br />problem, which could seriously threaten the health of all humans, especially <br />from such waste that contains nuclear radiation and chemicals. Therefore this <br />matter has become an important topic worldwide. <br />Hail compost plant(200 tonslday capacity) has been chosen for the area of <br />research as an example to assist a questionnaire, which contains several queries <br />related to the health and safety facing it's employees. After collection and <br />analysis of the questionnaire, it indicated that there are serious health problems <br />related to the skin, eyes, chest, ears etc. <br />Further, the answers of most of the employees show a very high interest in <br />being involved in the other kinds of council jobs. Therefore a change either <br />weekly or monthly is needed for the employee. <br />Introduction: <br />Recently the investigations and research in health and environment has given <br />great importance to the waste recycling programs in the Kingdom of Saudi <br />Arabia, EGC countries and worldwide. The most recent studies such as <br />Mohamed Al-Kateb [I], Amen Al- Nowawe [2], Abu Ghazara [3] and other <br />indicate that the waste recyclable in the Kingdom of Saudi Arabia and EGC <br />countries is only around 5% from the total waste collected and the remaining <br />waste is either burnt or buried. This it seems is not equivalent to the <br />development standards that these countries have reached. The method, which is <br />used to dispose of the remaining waste, is hazardous to both humans and the <br />environment due to the gases released. <br />Investigations worldwide have given the environment great attention especially <br />towards the methods of waste recycling. For example in the United States of <br />America many methods have been created over the last few decades to assist in