2024-03-29T16:10:44Z
https://erjm.journals.ekb.eg/?_action=export&rf=summon&issue=10112
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
Evaluation Study on Speed Control of dc Series Motor Supplied by Photovoltaic System via Bacterial Foraging
A. S.
Oshaba
E. S.
Ali
This paper presents the design and evaluation of a speed control scheme for a DC series motorsupplied by Photovoltaic (PV) system. The proposed design problem of speed controller is formulatedas an optimization problem. Bacteria Foraging Optimization Algorithm (BFOA) is employed to searchfor optimal controller parameters by minimizing the time domain objective function. The performanceof the proposed technique has been evaluated with respect to load torque variation, ambienttemperature and radiation. Simulation results have shown the validity of the proposed technique incont ling the speed of DC series motor under different disturbances.
DC Series Motor
Photovoltaic System
Speed Control
PI controller
Bacteria Foraging Optimization Algorithm
2013
07
01
205
215
https://erjm.journals.ekb.eg/article_67424_3c62cd6415b0d14b3f07676d7b0946b9.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
Five-level Inverter Fed Five-phase Induction Motor Drive
I.
Bedir
Abd El-wahab
Hassan
Essam M.
Rashad
S. A,
Mahmoud
This paper presents simulation and experimental implementation of five-level, five-phase cascadedH-bridge inverter. The inverter is controlled by sinusoidal pulse width modulation technique andfed five-phase induction motors. The speed of the motor is controlled by varying stator voltagewith frequency, so as to maintain v/f ratio constant at the rated value. A fuzzy logic controller isalso considered for controlling the speed. Simulation program using the MATLAB/SIMULINKsoftware, for five-phase induction motors controlled by the proposed system is developed.Experimental results of the 1.5 Hp of five-phase induction motor show the effectiveness of theproposed control scheme.
Multilevel inverter
Fuzzy logic control
Multi-phase Induction Motor
2013
07
01
217
223
https://erjm.journals.ekb.eg/article_67426_bd6a99af84a52231c065ef71ea470d3f.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
PERFORMANCE OF CASCADED H-BRIDGE INVERTER INTEGRATED WITH HFT FOR PV SYSTEM APPLICATIONS
Mahrous
Ahmed
i.
Taha
This paper presents a photovoltaic system as a standalone system. The proposed systemconsists of photovoltaic (PV) module, battery energy storage system (BESS), high frequencytransformer, and multilevel inverter (MLI). The MLI consists of two H-bridge single phase inverterper arm (phase) with unequal dc voltages which needs 6 isolated de sources for the conventionalMLI. The relative values between the upper (auxiliary) inverter dc voltage and the lower H-bridge(main) inverter is 1/3 resulting in 9 levels MLI. Each isolated dc source comes from a PV moduleaccompany with a BESS. A high frequency transformer (HFT) is proposed in this paper to generatethe dc bus voltage of the auxiliary inverter from the main inverter dc bus voltage. As a result of thatthe number of isolated dc bus voltages required is reduced by half which is reflected in reducing thenumber of PV required and thus reducing the cost of the overall system. In addition, a naturalbalancing between the main and auxiliary inverters dc bus voltages of each arm will be attained dueto the HFT turns ratio which result in simplifying the overall control of the whole system. In order toreduce the size of the HFT a judicious modulation index (MI) will be chosen. The proposed systemhas been simulated using static inductive load. Analyses and simulation have been proposed tovalidate the proposed control scheme.
MLI
PV
HF Transformer
bidirectional converter
Isolated dc sources
2013
07
01
225
231
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
Welding of Cylindrical Parts by using Friction Stir Technique
A.M.
Khourshid
Tareq.s.
ELabiadi
I.
Sabry
The objective of this work was to investigate the mechanical and metallurgical properties inorder to demonstrate the feasibility of friction stir welding for joining A16061 and A16063aluminum alloys Welding was performed on cylindrical parts with different thickness 2mm and3mm, five rotational speeds,485,710,910,1120 and 1400 rpm and a traverse speed 4mm/min wasapplied. The tests were conducted for the study to determine the mechanical properties (maximumstress - the percentage of elongation) and hardness measurement along the welded sections usingthe Vickers method, was also studying the crystalline structure of welded joints .The FSW weldsexhibited many advantages over traditional arc welding techniques.
2013
07
01
233
245
https://erjm.journals.ekb.eg/article_67429_9613c5c07cbb7ca4b4437853ae8ba0f8.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
التوافق بين الهوية وتنمية المجتمعات والتغاير العالمي في المباني الثقافية مباني المتاحف الحديثة
ناهد أحمد
عمران
استوعبت مباني المتاحف الکثير من المتغيرات من جرد الحفاظ علي الثقافات الماضية الي التغيير في الشکل والتشکيل والمج مع العمران الحاضر بثقافته، وتعرض الدراسة مفهوم انثروبولوجيا المتاحف واهمية دور المتاحف في تنمية المجتمع الحلي والسياحة الثقافية
تنمية ثقافية
تصميم المتاحف
الهوية
ثقافة العولمة
مدن المعرفة
2013
07
01
247
257
https://erjm.journals.ekb.eg/article_67425_ab9bb6086c5538609cad4eb1552a5cdf.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
الحمامات الشعبية وتطورها في المجتمعات العربية
أحمد يحيي
إسماعيل
اتخذت الحمامات العامة (الحمامات الشعبية) مکانة متميزة في مختلف الحضارات غير ان کل حضارة کانت تضع تعديلات في تصميم هذه الحمامات بما يتناسب مع ظروفها وعاداتها ومعتقداتها کما کانت تختلف في المقياس من حضارة الي اخري ففي الحضارة الرومانية مثلا کانت تصل الي مقياس مدن کاملة وفي الحضارة الاسلامية کانت متداخلة في النسيج العمراني للمدينة بل وکانت تنتشر في الاحياء السکتية الي ان وصل تطور هذه الحمامات الي الشکل الحديث الذي هو عليه الان في هيئة منجعات اسشفائية او مراکز استشفائية
الحمامات العامة
الحمامات الشعبية
حمامات حلوان
الحمامات الرومانية
2013
07
01
259
275
https://erjm.journals.ekb.eg/article_67423_f53e79026c241558abbed0348e8170de.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
(مؤسسات علاج الادمان الحکومية في مصر (دراسة تحليلية
محمود أحمد
دسوقي
صفاء
عيسي
يتناول البحث دراسة نموذجين من مباني علاج الادمان الحکومية في مصر ومشاکلها التصميمية المختلفة وتأثيرها علي نجاح العملية العلاجية ويقوم بتحليلها والمقارنة ما بينها ومن ثم يستطيع التوصل للنتائج والتوصيات التي من شأنها تحسين هذه الخدمات معماريا.
تصميم
علاج الادمان
مصر الحکومية
تحليل
2013
07
01
277
286
https://erjm.journals.ekb.eg/article_67428_a396195f99993aa573bfde9cdbedb8f7.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
LARGE SCALE PHYSICAL MODEL TO INVESTIGATE THE MECHANICS OF EMBANKMENT EROSION DURING OVERTOPPING FLOW
Entesar A. S.
EL-Ghorab
Ahmed
Fahmy
M.
Fodda
This paper presents the results of large scale physical model embankment failureexperiments. The model simulates the failure by overtopping of three embankmentsthat are varying in dimensions and soil type. The soil is either homogeneous puresand or mixture of sand, silt and clay. A new measuring technique consists of thelabeled rod bridge; grids lined and captured instantaneous pictures are utilized tomonitor the failure. It was used to analyze the morphological evolution duringembankment failure. The flow pattern and progressive failure of embankmentovertopping were investigated. The results showed four types of phenomenonduring embankment failure: erosion; erosion with sliding; erosion with mass failureand head cut migration. The results revealed that the recorded time to reach the fullbreach failure in case of mixture materials (sand, silt and clay) is seven times thatwith pure sand. Also, reducing the embankment height to 50% (0.9m), led toincrease the time to peak discharge 8.4 times that of large one (1.8m). Adding 15%clay to pure sand changes soil characteristics to (c and o) soil which makes soil tohave a critical vertical cut height. Set of dimensionless regression equations aredeveloped by using the experimental data. In conclusion, types of embankmentfailure are defined. Adding a percentage of clay (15%) to the pure sand led to themaximum remain vertical cut height of about 50% of the calculated critical verticalcut height (Z). Bearing in mind the limited number of large scale testes forembankment breach in literatures, the set of data could be used for calibration ofmathematical breach models and provides a reference for the flood risk managementof embankments.
2013
07
01
287
302
https://erjm.journals.ekb.eg/article_67430_8c9010deb5eb22b9faac6d5a63d95c53.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
INFLUENCE OF USING CONCRETE JACKET ON THE BEHAVIOR OF REPAIRED REINFORCED CONCRETE BEAMS
Noha M.
Soliman
Alaa A.
Bashandy
Reinforced concrete jacketing is one of the widely used repairing techniques for beams andcolumns. The aim of this research is to evaluate the efficiency of using concrete jackets usingdifferent reinforcements and thicknesses. The behavior of repaired reinforced concrete defectedbeams is investigated under flexural effect. The tested beams are preloaded up to 70 and 90% oftheir ultimate capacity then, repaired using concrete jackets. The main variables are thickness ofconcrete jacket (3, 5 cm), diameter of reinforcing steel bars (8, 10 mm) and concrete jacket type.The experimental results showed that, repairing using concrete jackets enhances the load capacityup to 378%. Increasing jacket thickness enhances the structural performance of the tested beamsand in the same time increases its weight. It also increases the stiffness compared to the controlbeam and consequently the repaired concrete beams indicated a brittle manner compared to theductile failure of the control beams.
Rehabilitation
Beam
Jacketing
Concrete, reinforced
deterioration
2013
07
01
303
315
https://erjm.journals.ekb.eg/article_67431_bfa10244e1ceb7df4beb4f7d93340cb7.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
Behavior of Recycled Self-Compacting Concrete
M.M
Kamal
M. A.
Safan
Z. A
Etman
E. A
Eldaboly
The effect of recycled materials as a recycled aggregate (crushed red brick and crushed ceramic)on the fresh and hardened properties of Recycled Self-Compacting Concrete (RSCC) wasinvestigated. Recycled materials were used to replace coarse aggregate at different ratios of 25%,50%, 75% and 100% to produce RSCC mixes. Twenty one concrete mixes were cast and test tofulfill the aim of this paper. This paper aimed at studying the properties of RSCC mixes andevaluating the behavior of RSCC beams under flexural loads. Nine tested loading simplysupported concrete beams were tested in flexure. The fresh properties of RSCC were evaluatedusing slump flow, J-ring and V-funnel tests. Compressive strength, splitting tensile strength andflexural strength were performed in order to investigate mechanical properties. The density fordifferent mixes was evaluated. The behavior of the tested beams was investigated with specialattention to the deflection under different stages of loadings, initial cracking, cracking pattern, andultimate load. The average of the compressive strength decreased by 34% and 26% for the mixeswith crushed red break and ceramics, respectively compared to that of control mix was observed.In addition, the density for the mixes with crushed red brick decreased by 14 % compared to thatof control mix. The obtained results presented the properties of this concrete were expected from astructure point of view, and that the recycled coarse aggregates can successfully be used formaking of SCC.
Self-compacted concrete
Red brick
ceramic
Recycled materials
flexural strength
2013
07
01
317
327
https://erjm.journals.ekb.eg/article_67433_2d7ac06af990fe2265438d85762bae9b.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
Reduction in environmental pollution using rice-husk ash in concrete
Turki Mesfer
Al-Aboud
The production of cement as a binding component of concrete is costly, consumes high energy,depletes natural resources and emits huge amounts of greenhouse gases (one ton of cementproduction emits about one ton of CO2). Consequently, environmental degradation, seriouspollution and health hazards associated with cement and concrete industries, have come underintense scrutiny from environmentalists and the governments. Developed and some developingcountries, are already using industrial and agricultural wastes in concrete. These wastes also poseseveral environmental problems. Partial inclusion of waste instead of 100% cement has been foundto be environmentally safe, stable, durable as well as economical. Rice husk ash (RHA), rich insilica content, can be produced from rice husk using appropriate combustion technique for use inconcrete as a supplementary cementitious material. The present study used rice-husk ash (RHA) asa partial replacement of cement in concrete. X-ray diffraction analysis, scanning electronmicroscopic examination, compressive strength (without and with superplasticizers), flexuralstrength, resistance to aggressive chemicals and cost analysis were carried out. Concrete andmortars containing 25% RHA as a replacement of cement, exhibited same or better resultscompared to conventional concrete. Moreover, it leads to substantial cost savings not to mentionbenefits to the environment.
Concrete
Rice-husk ash
X-Ray Diffraction
Scanning Electron Microscopy
Compressive strength
Flexural strength. Chloride and sulphate resistance
2013
07
01
329
338
https://erjm.journals.ekb.eg/article_67434_383da2241561650c9b0d6121ee238e43.pdf
ERJ. Engineering Research Journal
1110-1180
1110-1180
2013
36
3
ASSESSING THE BEHAVIOUR OF CONCRETE REINFORCED WITH DIFFERENT POLYPROPYLENE FIBER TYPES
a M. I
Abu-Khashab
This research was initiated with the objective of evaluating the effect of different polypropylenefibers on the mechanical characteristics of the concrete, experimentally. This was achieved byexamining the effectiveness of fiber addition in order to improve the concrete mechanicalbehavior. Five types of polypropylene fiber (PPF) were investigated to select an appropriate fiberto be added to the concrete mixture based on its purpose. A concrete mixture was designed and itsdifferent mechanical characteristics were examined. Specimens were tested after curing (i.e. after7 and 28 days). Durability tests (i.e. abrasion, plastic/drying shrinkage and temperaturedifferences exposure) were investigated. The results indicated that using PPF, randomly, helps tobridge and arrest the formed cracks in the concrete under different stresses such as that resultedfrom temperature differences exposure. Most of the tested PPF added to the concrete mixesproved its efficiency in improving the concrete abrasion resistance, controlling plastic so as dryingshrinkage cracking as well as reducing it and enhancing its distribution along the concrete surface.Using PPF-1/PPF-2 could improve the abrasion resistance up to 35%. Also, the plastic shrinkagestrain is minimized by 32% to 61% compared to its original value.
Polypropylene Fibers (PPF)
inclusion
Durability
Abrasion
Plastic
Drying
Shrinkage
resistance
Cracking
Tensile Properties,
2013
07
01
339
349
https://erjm.journals.ekb.eg/article_67435_8841af1cc222f75d6127e47714b158d6.pdf