Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001CONDENSATION CHARACTERISTICS DURING SUPERSONIC FLOW OF ORGANIC VAPOURS1317113010.21608/erjm.2001.71130ENN.H.MahmoudDepartment of Mechanical Power Engineering,
Menoufiy a University, Shebin El-Kom, EGYPT.Journal Article20200215Condensation of some organic vapours including ammonia, ethanol and - <br />fieon-1 1 by homogeneous nucleation of liquid droplets has been studied <br />here during supersonic flow through convergent-divergent nozzles. <br />Theoretical model of the present work is based upon three groups of <br />equations namely: gasdynamic equations, equations of condensation kinetics <br />and droplets growth equations. Modified equations for the classical <br />nucleation rate, droplets surface tension and the thermodynamic properties <br />of the condensing vapour are used in the present theoretical model. <br />Generally, present model predictions show that condensation characteristics <br />of the tested organic vapours are qualitatively similar to those of steam <br />condensation. Also, the present study indicates that the condensation <br />characteristics of the tested organic vapours are affected with the operating <br />parameters such as the vapour temperature and its mass fraction. The <br />theoretical predictions of the pressure variation along the divergent sections <br />of such supersonic nozzles are in good agreement with the published <br />experimental measurements of these organic vapoursMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001Fuzzy Logic Control of Saturated Induction Machine33477113110.21608/erjm.2001.71131ENMona N.EskandeElectronics Research Institute
Department of Power Electronics
Do&, Cairo, EgyptJournal Article20200215In this paper, two methods for controlling saturated slip power recovery drives <br />(SSPRD) are studied and compared. To account for saturation, a polynomial <br />approximation is used for the proper account of the nonlinear magnetization <br />reactance. Fuzzy logic (FL) is then proposed for intelligent control of the saturated <br />slip power recovery drive.The characteristics of the FL controlled SSPRD during <br />start up is presented. The FL controlled system responses to step changes in the <br />reference speed , load torque, and parameters variation are presented. A comparison <br />between the responses of a PI controlled SSPRD and the FL controlled SSPRD to <br />variations in reference speed, in load torque, and in rotor resistance, is obtained. <br />Results proved that the FL controlled SSPRD attains faster responses, accurate speed <br />tracking, higher load disturbance rejection, and lower sensitivity to parameters <br />variation', than the PI controlled SSPRDMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001MATHEMATICAL MODELLING FOR t PREDICTING THE THERMAL PERFORMANCE OF SOLAR DISTILLATION UNITS49707113210.21608/erjm.2001.71132ENMOHAMMED A.HabibMECHANICAL POWER ENG., FACULTY OF ENG.
MENOUFIYA UNIVERSITY, SHEBIN EL-KOM, EGYPTSHEDID H.SHAMS EL-DIN.MECHANICAL POWER ENG., FACULTY OF ENG.
MENOUFIYA UNIVERSITY, SHEBIN EL-KOM, EGYPTJournal Article20200215A single basin-type solar still with an area of 0.65 m2 is <br />constructed in Menoufiya University and tested under the transient <br />operation conditions. The hourly variation of basin water, glass cover <br />and ambient temperatures, as well as the evaporative mass transfer rate <br />are measured during the operation. A thermal model has been developed <br />for predicting the performance of the unit. The model is based on the <br />outdoor measurements of distillate water collected from the still and the <br />heat balance equations. Experimental data for evaporative mass transfer <br />rate, basin-water temperatures, glass cover temperatures and heat <br />transfer coefficients have been compared with the predictions data <br />obtained from the model. The comparisons are also made with the <br />experimental data using three mathematical models: Turbulence, <br />McAdams, and Adhikari models. The Grashof number was ranged from <br />5.13~10 to 2.10~10 * . <br />It is found that the general trends of the model predictions are in <br />a reasonable agreement with the experimental data. However, the <br />predictions for the solar distillation are found to be sensitive to the <br />empirical correlation employed to describe the unit performance. For the <br />three models tested, the turbulence model overpredicted the evaporative <br />mass transfer rates and heat transfer coefficients. The other two models, <br />McAdams and Adhikari, underpredicted these rates and coefficients. <br />The basin water and glass cover temperatures have the predictions <br />inverted. It is concluded that the present model has the better <br />predictions of the still performance compared with other models. <br />Particular care, however, must be taken in4he choice of the heat transfer <br />correlation necessary for calculations.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001A MODIFIED METHOD FOR LATERAL SPREAD IN THIN STRIP ROLLING71827113310.21608/erjm.2001.71133ENJournal Article20200215A rolling method lo increasc [he width of the metal would 'twx <br />advantages lnulii pass strip pr ndtlctiol~? giving high producl i vii y <br />and control of ;exmrc oi. planz- aisotropy. In coi~vei~tioional flat <br />rolling, however. it is ilifkiilt to produce metal fl~w iin the lateral <br />direction. A new method tor spread rolling has bee^ proposed in <br />.the literature, in which severai portions of strip width are roiied <br />between a roll that has 22a11y circumferential grooves and a fiat <br />roll. In the present work, new modifications in roil profile and <br />rlurrlhrr of grooves are irlinduced. The advantages of the new <br />1.r- AS? A UL~ are e iiiiough rolling of pure commercial <br />alumimm sti-ips. It is found that a strip of 70 mrn wide and I mm <br />thickness twc been widened up to 3.1% under a reduction c;f <br />35%. It is tbuzd also that the planar anisotropy decreases. A <br />special pur;lvsr nonlinear ilrde element progrm has been <br />developed to deal with continuous change of contact berween the <br />roll and the strip in each roiling pass. The calcuimd smin tensor <br />is utilized to investigate the iocdi~eci necking.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001دراسة في بناء العملية التصميمية83957113410.21608/erjm.2001.71134ENحازم محمد نورعفيفيقسم الهندسة المدنية - کلية الهندسة بشبين الکوم - جامعة المنوفيةJournal Article20200215Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001APPLICATION OF SIMILARITY TRANSFORMATIONS IN GEODETIC MONITORING NETWORKS971137113510.21608/erjm.2001.71135ENHishamAbou HalimaAssistant Professor, faculty of Engineering, Mansoura University, EgyptAbo El Hassan F.RahilAssociate Professor, faculty of Engineering, Shebin El-Kom, Minufiya University, Egypt.Journal Article20200215Similarity transformation are useful in the detection of deformation and for the <br />connexion of geodetic networks. The estimated netpoints coordinates and their <br />covariance matrix can be transformated from one computational base to another <br />without repeating the adjustment process via an similarity transformation. The <br />derivation of the transformation matrices is closely connected with the properties of <br />generalised matrix inverses which have been mentioned in connection with inner <br />constriants. <br />The main objective of this paper is to introduce the partial trace minimization <br />approach as an proposed general solution technique for free geodetic net work. In <br />addition the problem of transforming regular covariance matrix into a singular one <br />with the required rank deficiency and vice verse will be solved. The structure of the <br />transformation tnatrices for different datum defects have been deduced. Finally the <br />use of similarity transformation to transform a covariance matrix from one <br />computational base to another is introduced and disussed.Two numerical examples <br />representing simulated and real geodetic networks were given in order to illustrate the <br />application and the efficiency of the underlying theoretical conceptMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001EVALUATE OF TWO DIFFERENT METHODS IN CLOSE RANGE PHOTOGRAMMETRY FOR DETERMINATION 3-D COORDINATE APPLIED TO VERTICALITY CHECKING1151307113610.21608/erjm.2001.71136ENAbo El Hassan M.RahilAssociate Prof,faculty of Eng.,Shebin El-Kom,Minufiya University,Egypt.HishamAbou HalimAssistant Prof ,faculty of Eng., El-Mansora, El-Mansora University, Egypt.Journal Article20200215There are many ways to construct object -space coordinates, each is <br />designed for a certain purpose. In this research, a comparison between two <br />different methods, in close range photogrammetry was carried out, in order <br />to find, the more accurate, simpler and more economic method. The <br />accuracy in each method was determined by comparing its coordinates with <br />the coordinates of the test field, which were calculated from the intersection <br />method.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001BEHAVIOUR OF AIR-WATER-OIL MIXTURE FLOW THROUGH A CENTRIFUGAL PUMP1311427113710.21608/erjm.2001.71137ENK.A.IBRAHIMMechanical Power Engineering Department, Faculty of
Engineering, Minufiya University, Shebin El-Kom, EgyptM.A.EL-KADIMechanical Power Engineering Department, Faculty of
Engineering, Minufiya University, Shebin El-Kom, EgyptJournal Article20200215The behavior of air-water-oil mixture flow through a single stage radial flow <br />type centrihgal pump has been studied experimentally. In this study effects of <br />changing the oil concentration, the amount of air injected into the suction side <br />and the oil viscosity on the pump perfbrrnance under diEerent operating <br />conditions were considered. The results obtained fi-0111 this study are usef'ul for <br />those who are working in chemical and petrole~un industries. For certain <br />operating conditions, the head generated by the pump, pump discharge, pump <br />efficiency and the power required to drive the pump were mainly atyected by <br />the ci! concentrslticm, type of oil and the amowt of air bubbles flowing through <br />the pump impellerMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001SINGLE-PHASE TO THREE- PHASE CONVETER FOR LOW COST AC MOTOR DRIVES1431587113810.21608/erjm.2001.71138ENT.S.RadwaElectrical Engineering Department, Faculty of
Engineering, Minoufiya University, EgyptS.A.MahmoudElectrical Engineering Department, Faculty of
Engineering, Minoufiya University, EgyptZ.M.El-BarbaryInternational Steal Rolling Mill "ISRM", Sadat CityJournal Article20200215In this paper, a single- phase to three- phase converter is proposed. to provide <br />variable output voltage and frequency. The proposed topology employs only six <br />IGBT switches, which form the front-end rectifier and the output inverter for the <br />one step conversion from single-phasc supply to output three-phase supply. The <br />front-end rectifier permits bidirectional power flow and provides excellent <br />regulation against fluctuations in source voltage. Moreover, it incorporates active <br />input c~u-rent shaping feature. An easy method to implement control strategy is <br />proposed. This control strategy ensures nearly unity input power factor with <br />sinusoidal input current over thc operating range. Based on vector control <br />technique, the proposed converter is used for speed control of three-phase <br />induction motor. A low cost of motor drive can be achieved using the proposed <br />technique. Simulation and experimental results are carried out to analysis and <br />explore the characteristics of the low cost drive system.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001A CLOSE ACCORD ON DFT BASED FREQUECY AND PHASOR ESTIMATORS USED IN NUMERICAL RELAYS1591757113910.21608/erjm.2001.71139ENH.A.DarwishPower System Protection Group (PSPG), Menoufiya University,
Faculty of Engineering, Shehin El-Kom, Egypt.Journal Article20200215Abstract: In this paper, a close accord on the Discrete Fourier Transform (DFD <br />technique based frequency and phasor estimations for protective numerical relays <br />application is presented The eflectiveness of the recursive DFT, in particular, is <br />examined via simulation corroborated by experimental verification. Possibility of <br />error accumulation in the estimated magnitude by the recursive DFT is highlighted <br />and novel solutions are proposed. Impuct of different input signal patterns on the <br />algorithms' performance is further examined. In addition, effect of rate of change of <br />input signal friquency on the estimated values is pinpointed. The testing circuit <br />hardware is implemented using the digital signal processing technologv. The results <br />of this studv are great& valuable for the protection engineers particularly those <br />cuncerned with the development and implementation of numerical rela-vsMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001COMPARATIVE STUDY OF FAULT LOCATION METHODS & FOR RADIAL DISTRIBUTION SYSTEMS1771917114010.21608/erjm.2001.71140ENA. I.TaalabFaculty of Engineering, Menoufiya University
Shebin El-Kom, EGYPTM. A.ElkhazendarFaculty of Engineering, Menoufiya University Tanta University,G. E. M.AlyFaculty of Engineering, Menoufiya University Tanta University,M. A.AlamFaculty of Engineering, Menoufiya University Tanta University,Journal Article20200215In this paper, a comparative study crmong various fault location <br />techniques used for radial distribution feeler is presented. In these techniques the <br />three-phase . fun~lr~metitcrl curretit and volttrge phasors crt the relryitig poitit are used <br />to compute the jirult locatioti. Tliis coniputrrtion is based on simulating riti actual <br />rural rlistrihutioti jkeder using the Electrom~igtzetic Transient Program (EMTP). <br />The eflect uf intermecliate loads, fault resistance, atzcl tlie fault type and locatioti on <br />the rrccuracy offrrrrlt location rletermitzcrtioti is investigated Applicability ofencli of <br />the techniques to on-line cipplication is e~amitiecl. The results revealed the most <br />crppropriate technique anwng tlie comprrred&uilt 'location technique.^.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001Microprocessor Closed Loop Control of Induction Generator1931997114110.21608/erjm.2001.71141ENMoustafa El-SayedEl-ShebinyElectrical Engineering Dept., Faculty of Engineering, Minoufiya University, Shebin El-Kom,Journal Article20200215This paper presents a new simple approach for controlling the terminal voltage of capacitor <br />self-excited induction generators. The method is based on switching ON or OFF certain extra <br />capacitor banks that are connected with each phase of the induction generator. Only one leg <br />consists of an IGBT and diode-bridge is required as a switch for each phase for three-phase <br />self-excited induction generator. The advantages of this method are simple, powerful, <br />effective and less expansive. Transient and steady state performances of induction generator <br />terminal voltage are presented under different operating conditions. Simulation results for <br />both open and closed loop system are presented in comparison with similar experimental <br />results. A good agreement between simulation and experimental results were found.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001Grid-Connected Bulk Wind Energy System Installing Neural- Controlled Switched Reluctance Generators2012157114210.21608/erjm.2001.71142ENAmalMohamedElectronics Research Institute, Cairo, EgyptFadia M. A.GhaliElectronics Research Institute, Cairo, EgyptKhaled S.SakkouryElectronics Research Institute, Cairo, EgyptJournal Article20200215The paper presents modeling and simulation of the wind energy <br />conversion system (WECS) that consists of variable speed wind <br />turbine, switched reluctance generator (SRG), inverter system and <br />neural network (NN) controller. The wind park system under study <br />consists of a number of WECS's operating as utility connected. The <br />input mechanical power fluctuations, induced by operating wind <br />turbines at slightly disturbed wind velocity, lead to inject variable <br />electrical power into the grid. The NN controller is acting on the SRG <br />to assure feeding constant electrical power to the grid at each point of <br />mechanical power fluctuation and each corresponding wind velocity. <br />This objective is achieved by adjusting the onloff switching angles of <br />the SRG power converter. Simulation results are presented to show <br />the main characteristics of the SRG and verification of the proposed <br />WECS control systemMenoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001TORQUE ANGLE CONTROL OF INDUCTION MOTOR DRIVE WITHOUT SPEED SENSOR2172317114310.21608/erjm.2001.71143ENM.El-shebinyelechical Engineering Department, Faculty of Engineering, Minoufiya
University, EgyptE. E.El-kholyelechical Engineering Department, Faculty of Engineering, Minoufiya
University, EgyptA.El-hefnawyelechical Engineering Department, Faculty of Engineering, Minoufiya
University, EgyptEsam A.WadanInternational Steel Rolling Mill (ISRM), Sadat, Egypt.Journal Article20200215A control method of induction motor fed by current regulator pulse width <br />modulation inverter is presented to obtain fast dynamic response. This proposed <br />method is based on the closed-loop control of the torque angle and has the <br />merits of being simple in implementation and insensitive to rotor resistance <br />variation. The proposed scheme utilizes the inverter frequency as the necessary <br />system stabilizing, while the current amplitude merely adjusts the motor steady <br />state flux level. The stabilization is achieved by regulating the phase angle <br />between stator current and rotor flux. The design of proposed scheme is <br />introduced. Speed controller using synchronous reference frame PI regulator is <br />employed as an outer loop. Moreover, another synchronous reference frame PI <br />regulator is employed as inner loop to control the tangent of torque angle. An <br />analytical method for obtaining the rotor speed based on model reference <br />adaptive system without using stator and rotor resistance is proposed. By using <br />this method, speed sensor-less closed-loop torque angle control with no <br />influence of the stator and rotor resistance variations obtained. Also, this <br />proposed method does not require any integrators in its algorithm. In this paper, <br />the control scheme was successfdly implemented and tested in laboratory using <br />a high-speed signal processor (DSP). The experimental results validate the <br />theoretical predictions with different dynamic operating conditions.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001INFLUENCE OF TYPE AND CONTENT OF FIBERS ON THE PERFORMANCE OF SELF-COMPACTING CONCRETE2332447114510.21608/erjm.2001.71145ENM.M.BalahaLecturer Eng. Materials Dept., Faculty of Eng., Zagazig University, Zagazig, E'gyyt.Journal Article20200215Self-compactiag concrete (SCC) is used to facilitate constmctability and ensure proper <br />filling and good structural yerforrmce of highly cot~gested and coniplex design structural <br />sectiot~s. It is also used to itriprove productivity of concrete placet:~ent and provide better <br />workiug erlviro~llnent by elinhating the vibration noise. Tlle use of fibers in SCC provides a <br />way of iacreasit~g productivity as it cott~bines the positive effects of elimillatilig vibration work. <br />Tlle purpose of this study is to investigate the self-cornpactability of fiesli concretes <br />with differeht types of fibers (steel, glass and polypropylene fiber n~esli) and different <br />volumetric ratio of fibers (0.0, 0.5 ad l %). hl this pay er, the self-comp actability of fresh <br />co~lcretes with tliese types and Were~~t a~i~ou~~ts of fibers were investigated by lneatis of the <br />sluuip flow test, tlie V-type fimnel test and L-box method. No compaction was used for the <br />SCC mixes, while the refcrelm mix was conymted using tlle vibratirig table. Also, in this <br />study, tile mechanical y rop ertics of hardened self-con~pactiug concrete (SCC) were investigated <br />iu tems of standard compressive and splitting tensile strength <br />Results from these tests show that there may be a slight reduction in workability due to <br />the addition of fibers. However despite the s~ilall reduction iu workability it is geuerally not <br />more dificdt to produce a good SCC with fibers than without. Tlie results indicate that it is <br />possible to achieve a good SCC also with a rather large amoumt of fibers.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001CRITICAL CONDITIONS OF THE SHIP INSIDE THE LOCK CHAMBER DURING FILLING AND EMPTYING FOR END b FILLING SYSTEM2452617114810.21608/erjm.2001.71148ENKassem S.El-AlfyAssoci. Prof, Irrigation & Hydraulics Dept., Faculty of Engineering, Mansoura UniversityM. F.SobeihAssoci. Prof, Irrigation & Hydraulics Dept., Faculty of Engineering, Mansoura UniversityA.M.TalaatProf., Irrigation & Hydraulics Dept., Faculty of Engineering, Ain Shams University.A.FahmyProf, Director of Nile Research Institute, National Water Research CenterM.KamelPh.D., Researcher in Hydraulic Research Institute, National Water Research Center.Journal Article20200215An experimental model was constructed to simulate the forces <br />affecting upon ships inside the navigation locks under a relatively new method <br />of filling and emptying process laid in the chamber floor. The tests were <br />carried out for three different positions of the ship affixture inside the lock <br />chamber with respect to the filling system. In each position, both the <br />longitudinal and the lateral forces affecting upon the ship were measured by <br />using advanced electromagnetic system of pressure transducers connected <br />with a data logger and personal computer for the two cases of the ship <br />orientation. In the first case of orientation, the bow faced the openings of the <br />filling system, while for the second one the stern of the ship faced the filling <br />system. The study illustrated that the longitudinal forces on the ship were <br />much more greater than the lateral ones. It was found also that the forces <br />affected upon the ship in case of filling process was much more greater than <br />that in the emptying one. The analysis of the results showed that the critical : <br />position of the ship affixture inside the lock chamber occurred when the ship <br />was closed to the filling system. Also, the stern of the ship was more critical <br />than that of the bow when facing the openings of the filling system.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118024420011001THERMAL DISCHARGE FROM MULTI-PORT DIFFUSER INTO SHALLOW WATER RIVERS2632817115010.21608/erjm.2001.71150ENM. M. FSOBEIHAssociate. Prof, Civil Eng. Dept. , Faculty of Engineering, Minoufiya Univ., Egypt.KASSEM S.EL ALFY,Associate Prof., Irrigation & Hydraulics Dept., Faculty of Eng., Mansoura Univ., Egypt.A. FKHATTABProf, Chan. Maintaince Res. Inst., N.W. Res. Centre, Egypt .M.B.SAADProf, Director of Hydr. Res. Inst. (HRI), N.W.Res.Centre, EgyptY.MSHAWKYPh. D, Researcher, Hydr. Res. Inst. (HRI), Egypt.Journal Article20200215In the following research, the phenomena of the thermal pollution fiom <br />the thermal power plant out-fall structure (multi-port difiser) in shallow <br />water rivers was studied. The sets of uni-directional multi-port difisers'were <br />experimentally studied. The different characteristics of the out-fall structure <br />(multi-port difiser), and the different parameters of the flowing water in the <br />river were considered. The study included a derivation of dimensionless <br />curves for the range of river and out-fall structure parameters typical of the <br />prototype river out-fall installations. Also, a general empirical formula, <br />which can be used in designing of the thermal power plant out-fall structure <br />(multi-port diffuser), discharging hot water into shallow river was developed. <br />The validity of the developed formula was tested against two sets of field <br />measurements of a prototype river difiser. The two sets of the measurements <br />represent values of the relative thermal concentration at any section <br />downstream the diffuser, CJC,, for a wide range of hydraulic and diffuser <br />parameters. A good agreement between the field data and the experimental <br />data was found. Also, the analysis showed that the best fit of both the <br />measured data and the corresponding results from the developed formula had <br />the same shape and the same trend.