2024-03-29T04:40:41Z
https://erjm.journals.ekb.eg/?_action=export&rf=summon&issue=10845
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
A double-fed equivalent reluctance motor drive system
S.M.R.
Tahoun
2000
01
01
1
14
https://erjm.journals.ekb.eg/article_71176_853d278c982469aad9380001dfd3b61c.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
Design and performance of an open loop controlled reciprocating reluctance motor
M.E.
Abdel-Karim
A.H.
Morsi
2000
01
01
15
29
https://erjm.journals.ekb.eg/article_71181_1faa5fb40db7573a51e98bc431169668.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
Case Study for: Impact of WWTP effluent on drains water quality in Egypt.
D.S.
Elmonayeri
The stream sanitation and pollution control is dependent on natural self-purification, the ability of the stream to assimilate wastes and restore its ownquality. The stream solvency in transit along its course reflected by the balanceof outgo and income dictated by four primary self-purification factors: 1)stream runoff, 2) time of passage, 3) temperature and 4) reaeration. Thedissolved oxygen (DO) profile resulting from specific organic waste loadinghas been considered as an indicator of the stream condition. In this work, ananalytical model has been used to predict the DO profile along to drains inEgypt. The calculated DO shows a good agreement with those values obtainedfrom the field measurements.Introduction:One of the most critical problems today, which requires a quick solution, isthe failure of water to meet the required demands. This arose the need toprotect the available surface water sources from pollution.One major source ofsurface water pollution is the discharging of raw or treated -sewage into thesurface water stream. The impact of pollution on the receiving water body ismanifold and dependent upon the type and concentration of the pollutants(Nemerow and Dasgupta, 1991). The different pollutants, e.g. pathogens,cusnended solids organic matter. algae. nitrate, salts, etc. have different
2000
01
01
31
42
https://erjm.journals.ekb.eg/article_71185_64d8ea3ed210b7515e922fb446b77c35.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
Performance Improvement of the Single-Phase Induction Motor by Using a Statically-Controlled Capacitor
M. M.
Khater
This paper presents an approach for improving both the starting and runningperformance of the single-phase induction motor using a statically controlledcapacitor. The control principle is based on a PWM switching for the auxiliaryseries capacitor using a pair of fast electronic switches. The proposed schemeensures continuously varying capacitance of the auxiliary circuit. A d-q modelfor the single-phase induction motor operating under the proposed control hasbeen developed and numerically analyzed. The optimum operating conditionsfor starting and running has been obtained. A laboratory set-up has been builtand experimentally tested to examine the proposed control. Simulation andexperimental results are compared and shown to be in good agreement.1. INTRODUCTIONSingle-phase induction motors are widely used specially in domestic and officeapplications. They have the advantages of rugged construction, maintenance-free and low cost. The main problem of this motor is that it is inherently of noen annenhage
2000
01
01
43
60
https://erjm.journals.ekb.eg/article_71188_e81b7db08436be221e846e58d66cf81e.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
DESIGN OF A PI CONTROLLER FOR A SUPERCONDUCTING GENERATOR
G.A.
Morsy
H.
Khattab
A.M.
Kinawy
This paper proposes proportional integral (PI) controller tomodulate the performance of a superconducting generator(SCG) according to its speed variation. The control designprocedure is simple and the proposed controller is also relativelysimple for practical implementation. Eigenvalue analysis of thecontrolled system reveals that the Pi controller is quite effective.Digital simulation studies using detailed nonlinear system modelare also performed in order to show the effectiveness of theproposed controller over a wide range of operating conditions.
2000
01
01
61
77
https://erjm.journals.ekb.eg/article_71194_6bfd94beb554fd84b7e0beb96d435c6e.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
Arabic Optical Text Recognition: A Classified Bibliography
Asim A.-F.
Nabawi
Sabri A.
Mahmoud
A classified bibliography and a lexicographically-indexed table of 260items of literature pertaining to the optical recognition of Arabic texts, includingHindi numerals' recognition, are provided. The lim number items cited in thisbibliography highlights two points. First, the difficulties facing researchers incollecting dispersed references pertinent to this research area, which was in the firstplace a major incentive to working on this paper. Second, the limited efforts andresources expended in promoting this branch of research, evident from comparingthe volumes of reported OCR research works and products on Latin and otherlanguages with those on Arabic. A keyword-based classification scheme whoseresults may help in locating papers of interest in a certain research subtopic isimplemented. An appendix provides a classified table highlighting the features ofeach of the included literature items, offering a glimpse of an overall picture.
Arabic Optical Text Recognition Arabic Optical Character Recognition
2000
01
01
79
131
https://erjm.journals.ekb.eg/article_71196_826d7094aa8f9fa38761224bad8bdbdc.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
A Multi-Criterion, Multi-Expert Fuzzy Approach to The Selection of A Software Tool
Hindi A.
Al-Hindi
Waiel
Abd EL-Wahed
The technology part of business software applicationsdevelopment, represented by a variety of software tools, has improvedsignificantly in recent years. This necessitates utilizing advanced selectiontechniques to reduce the chance of failure associated with acquiring a newtool. This paper presents a multi-criterion fuzzy approach capable ofintegrating evaluation results obtained from a number of experts to select anappropriate software tool. The proposed approach combines and extends theattractive features of both the analytic hierarchy process and fuzzy set theory.The approach is demonstrated by solving an application of software toolselection
software tool selection
multi-criterion fuzzy decision making. 1. Introduction
2000
01
01
133
144
https://erjm.journals.ekb.eg/article_71198_a87333991235242be3e0d1e75103eccc.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
FLOW OF DRAG REDUCING FLUIDS THROUGH A SUDDEN ENLARGEMENT
M.H.
Embaby
M.A.
El-Kady
Theoretical and experimental studies, of drag reducing dilute polymer solution flowthrough a sudden enlargement, are carried out. A turbulence model, which has beenearly used for predicting Newtonian flows with adverse pressure gradient (APG), isdeveloped in the present analysis. The developed model well predicts the fullydeveloped drag reduction flow in pipes, i.e. flow under favorite pressure gradient(FPG) conditions besides the sudden enlargement (APG) flow. Predictions, of themean flow properties and turbulence characteristics of drag reduction turbulent flowsin a sudden enlargement -i.e. under (APG)- are obtained and discussed. Anexperimental setup is established for studying the pressure characteristics of the flowthrough a (2:1) diameter ratio sudden enlargement test section. The working fluids aredilute solutions of Polyethylene Glycol (PEG) polymer in tap water. Comparisonbetween theoretical and experimental pressure distribution results shows a reasonableagreement. It is concluded that the developed turbulence model can be used to predictdrag reducing polymer flows under both (FPG) and (APG) conditions.
2000
01
01
145
163
https://erjm.journals.ekb.eg/article_71201_fbca9938b640856b3d3e50ac8bc57acf.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
ELECTRICAL WELDING TRANSFORMER DESIGN
AHMED M.
EL-KHATIB
This paper presents a survey to the design procedures of dry cooling moving limb arc weldingtransformer types. Two different methods are used for this purpose. The first method is basedon analytical approach, while the second method is based on numerical approach, finiteelement method (FEM). A two dimensional finite element method is used to compute the fluxdistribution in each transformer parts. The transformer parameters, losses and lossesdistributions, electromagnetic force on the windings and force distribution, temperature riseand performance characteristics during the design process are calculated, also. The nonlinearlyand saturation of iron core are taken into account by using the actual B-H curve of the ironcore. This procedures is established and used to build and analyze different types and ratings oftransformers. Theoretical, analytical and FEM, and experimental characteristics are carried outon 400A welding transformer and a comparison is given between them. It has been shown thatthe FEM method gives better results than analytical method, where a good agreement isobtained between the predicted characteristics that calculated using FEM and experimentalones.
Welding transformer design
FEM for transformer analysis
force computation in transformer
loss computation in transformer
temperature rise calculation
automatic triangle FE grid generation
2000
01
01
165
190
https://erjm.journals.ekb.eg/article_71204_f2e91e08340dce4ab01fecaad3e23cf7.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
On the controlling metal removal thickness in ECM process
M.S.
Hewidy
Electrochemical machining [ECM), offers the unique advantage of a betteraccuracy and high surface integrity of hard machined components. A newtechnique has been developed to utilize a simultaneous moving and rotatingelectrode to remove a specific amount of material, from a pre-machined holesand rods of hardened steel specimens. One of the electrodes was provided withtwo simultaneous movements; traverse speed and rotational speed. Theelectrolyte was pumped into the gap between tool and workpiece, through amatrix of fine holes distributed along one of the electrode surfaces. Amathematical model has been proposed for accurately estimating the thicknessthe removed workpiece layer under different working conditions.Experimental results revealed that this technique could lead to the removal of asurface layer thickness up to 200 microns, which consequently, classified thismethod as a super finishing process. Finally, the results of the experiments andthe simulation are compared to each other. The obtained results are anendeavor to enhance the controllability of the ECM process.
2000
01
01
192
202
https://erjm.journals.ekb.eg/article_71206_4446f8487794f73c38ca4f70364e8059.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
Manufacturing of axial slots by electrochemical machining process
MS
Hewidy
T A
El-Taweel
Axial slots are usually required for generator rotors, journal bearing and sliding bearing.Machining and finishing of these slots usually achieved through milling techniques. However, ithas been found that there is difficulty in achieving adequate surface finish and acceptabledimensional accuracy of the resultant slot shape. Recently, electrochemical machining (ECM) hasbeen suggested as a promising technique valid to produce these slots under high surface qualityand min. machining costs. The previous attempts have been carried out through successive ECMprocesses, first to machine the hole, and then to create the slots. In the present work, an attempthas been submitted to get both of the hole and slots in one pass as a final process. A special ECMtest rig has been designed for this aim. The main affecting parameters on the resultant slot shapewere, tool geometry, applied voltage and feed rate. The results obtained in this work enable themanufacturing engineer to select the required shape dimensions through different combinationsof FCM parameters.
2000
01
01
203
211
https://erjm.journals.ekb.eg/article_71209_4133eb3627d9f579ffd7a967d5021f9c.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2000
23
1
DYNAMIC PERFORMANCE OF FOUR POLE PER PHASE 12/8 SWITCHED RELUCTANCE MOTOR
M.A.
Abdulatif
S.M.R.
Tahoun
M.M.
Khater
M.M.
El-Shanawany
S.A.
Hassan
In this paper, the dynamic performance of four pole/phase switched reluctancemotor (4PSRM) is investigated analytically and experimentally. Differentdynamic conditions are considered which include motor starting under load,step change in load, load perturbation, and a step change in the supply voltage.A laboratory prototype of 4PSRM has been designed and built. An asymmetricpower converter along with the drive circuit has been designed and built toexcite the motor. A mathematical model of the dynamic operation has beendeveloped and numerically simulated. Both the measured and calculated resultsare found to be in good correlation.
2000
01
01
213
228
https://erjm.journals.ekb.eg/article_71213_424eb461d72275e940bee4b59c19e16a.pdf