@article { author = {El-Zeftawy, A. A. and Yasin, H.A. and Gado, A. A.}, title = {OPERATING WIND GENERATOR WITH ALTERNATIVE RENEWABLE ENERGY SOURCES TO SUPPLY ISOLATED LOADS}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {123-128}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69516}, abstract = {The energy output of a wind generator (WG) variable due to the variation of wind speed at the installation site through the day hours and year months. Therefore, a back-up power supply (BUPS) is necessiuy for operating WG to supply isolated loads. This BUPS may be diesel generator or/ and alternative sources of renewable energy system (RES) which are available at the installation site. The diesel generator as a BUPS with WG to supply isolated loads had been studied in previous publication. In this work, alternative of RESs are studied and assessed as a BUPS for operating with WG to supply isolated loads. These alternatives are photovoltaic power system (PVPS) or/ and battery storage (BS). So, a hybrid model is presented here incorporates the added futures of dynamic modeling and graphic user interface in the power system block set and matlap program to assess the capacity of these BUPSs for operating with WG to supply isolated loads. Also, an economical model has been introduced to optimize the considered BUPSs from economical point of view. These models are applied numerically to estimate the capacityif alternative of WG/ BS and WGI PVPSI BS generation systems to supply an isolated load of a tourist village on the Egyptian coast of Red Sea. Also, these alternatives are optimized economically to supply the load study}, keywords = {}, url = {https://erjm.journals.ekb.eg/article_69516.html}, eprint = {https://erjm.journals.ekb.eg/article_69516_4b7b82d724713a54a79d91f591d8b72c.pdf} } @article { author = {Abdel Kader, F. E. and Deraz, S. A.}, title = {FUZZY LOGIC BASED VOLTAGE CONTROL OF A SELF EXCITED INDUCTION GENERATOR DRIVEN BY A VARIABLE SPEED WIND TURBINE}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {129-139}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69517}, abstract = {This paper presents a novel fuzzy voltage controller for a stand-alone three-phase self-excited induction generator (SEIG) driven by a variable speed wind turbine. The generated voltage of the SEIG is regulated by adapting the value of excitation capacitance against wind speed and load variations using a fixed capacitor bank and a PWM current controlled voltage source inverter (CC￾VSI) with a single capacitor on its DC side. The proposed control scheme consists of two ky logic PI controllers and one hysteresis current controller (HCC). Fuzzy logic based voltage control of the SEIG helps to enhance its performance due to its non-linear adaptive gains, which are varied on-line as the system operating point changes. The need for adaptive regulating scheme comes !?om the fact that the wind turbine operates over a wide range of operating conditions and therefore the system is highly non-linear. A complete mathematical model of the system is developed in order to study its performance with the proposed controller. Simulation results using Matlab/Simulink software program demonstrate the effectiveness of the proposed controller in regulating the generated voltage of the SEIG against wind speed and load variations.}, keywords = {Induction Generator,Wind turbine,Fuzzy logic control,Voltage control,modeling}, url = {https://erjm.journals.ekb.eg/article_69517.html}, eprint = {https://erjm.journals.ekb.eg/article_69517_d1ad9f81df63ba0906037f6c26744c7a.pdf} } @article { author = {Abdel Kader, F. E. and Deraz, S. A.}, title = {ENERGY MAXIMIZATION AND VOLTAGE REGULATION OF A STAND-ALONE VARIABLE SPEED WIND ENERGY CONVERSION SYSTEM}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {141-150}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69518}, abstract = {This paper presents a new control strategy of a stand-alone wind energy conversion system. The proposed system consists of a three pbase induction machine connected to a variable speed wind turbine through a step-up gear box. A current controlled voltage sonrce inverter (CC-VSI) with an electronic load controller (ELC) is connected in parallel with the main load to the AC terminaIs of the induction machine. The proposed control strategy is based on fuzzy logic control principles which enhance the system performance. There are three fuzzy logic PI controllers and one hysteresis cnrrent controller (HCC) which are used to extract the maximum available energy from the wind turbine as well as to regulate the generator terminal voltage simultaneously against wind speed and load variations. A complete mathematical model of the proposed system is developed in order to simulate its performance with the proposed control strategy. Simulation results using MatlabISimulink demonstrate the effectiveness of the proposed contrcl strategy in capturing the maximum available energy Grom the wind turbine and in regulation of the generated terminal voltage simultaneously against wind speed and load variations}, keywords = {Induction Generator,Wind turbine,Fuzzy logic control,Electronic load controller,Voltage control,Energy maximization,modeling}, url = {https://erjm.journals.ekb.eg/article_69518.html}, eprint = {https://erjm.journals.ekb.eg/article_69518_982377b878de82ffcb9d2fc0ecb501e4.pdf} } @article { author = {Abdel-Kariem, M. and El-Khazendar, M. A. and Alaam, M.}, title = {EVALUATION OF FAULT DETECTION TECHNIQUES USED FOR INDUCTION MOTOR WITH STATOR WINDING TURN FAULT}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {151-158}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69520}, abstract = {In this paper, a comparative study among various fault detection techniques used for induction motors with stator winding turn fault is presented. In these techniques the three-phase voltage and current waveforms at the terminal of the motor are used to extract the fault signature. This study is based on simulating the faulty motor on phase (abc) fiame. The effect of load, fault resistance, and fault location "faulty turns percentage" on the accuracy of fault detector determination are investigated. Also, the imperfections existed in motor and voltage source unbalance are studied and corrected to cancel their effects on fault signature. Applicability of each of the techniques to on-line use is examined. The results revealed the most appropriate technique among the compared fault detection techniques.}, keywords = {}, url = {https://erjm.journals.ekb.eg/article_69520.html}, eprint = {https://erjm.journals.ekb.eg/article_69520_048e138cf3973ad398426fb086fd66e5.pdf} } @article { author = {Abdel- Fattah, A.}, title = {NUMERICAL STUDY OF FLOW IN AXISYMMETRIC TURBULENT OPPOSED JET}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {159-170}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69529}, abstract = {In this study the numerical investigation for unsteady two dimensional of turbulent opposed jets is presented. The numerical study is based on the solution of the complete Navier - Stokes equations and turbulence models using a finite volume technique. TDMA solver is used to solve the algebraic equations. The pressure - velocity coupling is achieved using the SIMPLE method. Simulation is carried out for a range of Reynolds number 5000 5 Re 5 11700. The distance between the exit of two nozzles is 0.4 5 Wd 5 1.0. The results show that the radial velocity increases in downstream direction until maximum and then decreases. This change depends on tbe distance between the nozzles exit and the flow time. The axial velocity decays in the down stream direction on the axial direction. The turbulence kinetic energy and the normal stress in the axial direction increase and they become a maximum at the stagnation point, which occurs in the separation plane. The pressure coefficient at the stagnation point decays in downstream direction. This decay decreases by increasing the distance between the nozzles. The comparison between the}, keywords = {opposed jets,v2 -f turbulence model,RNG model,k- E standard model,turbulent flow}, url = {https://erjm.journals.ekb.eg/article_69529.html}, eprint = {https://erjm.journals.ekb.eg/article_69529_a8b69e51bde760403177b64ea0c44e33.pdf} } @article { author = {Abd El-Baky, Mostafa A. and Azmy, Ahmed M.}, title = {SOLAR WATER DISTILLER WITH SEPARATED CONDENSER OR THERMOSYPHON FOR REMOTE AND ARID AREAS}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {171-180}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69530}, abstract = {Two modifications of solar water distiller using cement and aluminum absorber are presented experimentally. The tirst modification using separated condenser to purge the water vapor from the cement absorber distiller to increase the condensation. The second modification using plate thermosyphon charged with acetone installed in the bottom of the water basin in alumiaum absorber distiller to increase the input energy to distiller, thus increasing the water vaporization and condensation. The optimum tilted angle of glazing surface was obtained theoretically between 10-20" at latitude angle of 30'. The daily productivity of cement absorber distiller was obtained of 2.08 U(m2.day) and increased witb percentage of 18.7% using separated condenser. For aluminum absorber distiller the average daily productivity was attained to 2.96 L/(mz.day) and increased to 3.49 L/(mz.day) using plate thermosyphon. The overall efficiency was increased from 50 % to more than 65 %}, keywords = {Solar distiller,heat recovery,plate thermosyphon,distiller productivity}, url = {https://erjm.journals.ekb.eg/article_69530.html}, eprint = {https://erjm.journals.ekb.eg/article_69530_a54c4780d1285acba669441164923f98.pdf} } @article { author = {Selmy, A.I. and Khashaba, U.A. and El-Sonbaty, I.A. and Abd El-Baky, M.A.}, title = {TENSILE AND SHEAR PROPERTIES OP CROSS-PLY COMPOSITE LAMINATES WITH DIFFERENT OFF-AXIS ANGLES}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {181-190}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69532}, abstract = {A double-notch and modified Iosipescu shear test fixtures have been designed and manufactured to investigate in-plane shear properties of cross-ply composite laminate with different off-axis angles. A cross-ply [0°/900]2, glasslpolyester composite laminate was manufactured using hand lay-up technique. This laminate was cut at different off-axis angles (€lo= O0, 15", 30' and 45") to give different stacking sequences ([0°1900]2,, [15°1-75012,, [30°/-6O012, and [45"1-45"1~, respectively). The tensile properties (strength, modulus, and Poisson's ratio) were determined experimentally and theoretically fiom the elastic properties of the constituent materials. Shear properties (strength and modulus) were determined experimentally by the two tests. Shear modulus were predicted theoretically fiom the elastic properties of the constituent materials.}, keywords = {Composite,Iosipescu,double-notch shear test,cross-ply,off-axis angle,elastic properties,shear properties,tension test}, url = {https://erjm.journals.ekb.eg/article_69532.html}, eprint = {https://erjm.journals.ekb.eg/article_69532_bd91e4acd8318d73953abe6b184dbbb9.pdf} } @article { author = {Selmy, A.I. and Khashaba, U.A. and El-Sonbaty, I.A. and Abd EI-Baky, M.A.}, title = {INTERLAMINAR SHEAR BEHAVIOR OF CROSS-PLY GFRP COMPOSITE WITH DIFFERENT OFF-AXIS ANGLES}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {191-199}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69533}, abstract = {Double-notch and shod-beam shear test supports have been designed and manufactured to measure the interlaminar shear strength of cross-ply composite laminate with different off-axis angles. A cross-ply [O019O0], glasslpolyester laminate was manufactured using hand lay-up technique. The laminate was cut at different off-axis angles (OD, 15', 3O0and 45') to give ([Oo/9O"]2,, [15°/-750]b, [30°/-60°]&, [45°1-450]d stacking sequences. In double-notch shear (DNS) test, the effect of shear length on interlaminar shear strength was investigated. In short￾beam shear (SBS) test, the effect of specimen width on apparent interlaminar shear strength was studied. The interlaminar shear stress distribution for both DNS and SBS specimens were obtained. Failure modes of DNS and SBS specimens were investigated.}, keywords = {Composite,short-beam,double-notch,cross-ply,off-axis angle,interlaminar shear}, url = {https://erjm.journals.ekb.eg/article_69533.html}, eprint = {https://erjm.journals.ekb.eg/article_69533_afef8d60d13939b694854deb1ea30ead.pdf} } @article { author = {Kamal, Mounir M. and Safan, Mohamed A. and Salama, Radwa A.}, title = {EXPERIMENTS ON STRENGTHENED CONCRETE BEAMS WITH HYBRID STEEL-GRFP REBARS}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {201-210}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69535}, abstract = {The corrosion problem occurs due to lack of protection given by the concrete cover. The problem of steel reinforcement corrosion has regularly meant improving the quality of concrete, but this approach has only limited success. The aim of the current work is to study the strengthening of concrete beams by increasing the reinforcement area utilizing GFRP rebars instead of conventional steel. In-house mannfacturing of FRP bars bas been described in this research using locally available glass fiber roving and polyester to produce GFRP reinforcing bars. The produced rebars are used as internal reinforcement in simply reinforced concrete beams. All test beams are reinforced with steel rebars with different reinforcement ratios. The concrete cover of these beams with low reinforcement ratios was removed and the longitudinal steel bars and stirmps were exposed. The added GFRP rebars were fixed either inside or outside the stirmps and a suitable cover was provided. Different materials including high strength concrete, cement mortar and a special type of fibrous mortar known as engineered cemeutitious composite (ECC) mortar were used in casting the cover. Some test beams were designed to fail in shear and were strengthened by adding the extra GFRP bars and bonding extemal GFRP wraps to the beam sides in the shear span. The test beams were 100*150*1050 mm and were tested in flexure under 4-point bending up till failure. The structural behavior was investigated in terms of cracking and ultimate loads, deflections, and cracking patterns}, keywords = {RC beams,strengthening,hybrid reinforcement,GFRP bars,engineered cementitious composites,fibers}, url = {https://erjm.journals.ekb.eg/article_69535.html}, eprint = {https://erjm.journals.ekb.eg/article_69535_ade1ec90cb7da963f67d65908ee73644.pdf} } @article { author = {abady, a. n. and kozae, a. m. and rady, e. a.}, title = {ROUGH SETS REDUCTION FOR BINARY DATA}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {219-225}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69536}, abstract = {The major aim of this work is to introduce a new method for data reduction in information systems classified by nonequivalence relations. The suggested approach is useful for many real life data that can not be classsed into disjoint classes. The new approach is tested with examples and its ability for decreasing the noisy in data, as well as simpliiing the structure for extracting decision rules. Based on binary relation, this method is capable of discovering the reduct attributes or indispensable attributes which are useful for data description andlor prediction, and to remove the dispensable ones.}, keywords = {Reduction,information system,binary relation}, url = {https://erjm.journals.ekb.eg/article_69536.html}, eprint = {https://erjm.journals.ekb.eg/article_69536_606ec6f2e2cfd99cbbb6833f010ed6bb.pdf} } @article { author = {Nabwey, Hossam A. and Abady, A. N. and Habik, S. E and Rady, E. A. and Farag, T. M}, title = {,N APPROACH TO RULE DISCOVERY IN INCOMPLETE INFORMATION SYSTEMS}, journal = {ERJ. Engineering Research Journal}, volume = {31}, number = {2}, pages = {227-234}, year = {2008}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2008.69538}, abstract = {This paper introduces a probabilistic rough set approach to rule discovery fiom incomplete decision tables. The core of the approach is a soft hybrid induction system called the Generalized Distribution Table and Rough Set System (GDT-RS) for discovering classification rules. The system is based on a combination of Generalized Distribution Table (GDT) and the Rough Set methodologies. With every decision rule two conditional probabilities associated, namely the certainty factor and the coverage factor. The probabilistic properties of the Decision rules are discussed}, keywords = {Rough set theory,incomplete data,Missing attribute values,Generalized Distribution Table (GDT),Rule discovery}, url = {https://erjm.journals.ekb.eg/article_69538.html}, eprint = {https://erjm.journals.ekb.eg/article_69538_f8ee17ada4d5d639ad7bedbc1af6bef3.pdf} }