Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
AN EXPERIMENTAL STUDY ON EFFECTS OF GLASS-WOOL ON TRAVELLING WAVES IN A DOUBLE-CAVITY MUFFLER
215
223
EN
M.
Nasr
Mechanical Power Engineering Department, Faculty of Engineering,
Shebin El-Kom, Minoufiya University, Egypt
10.21608/erjm.2011.67274
A muffler is a device designed to reduce the emission of the noise produced from cars engines. Reactive muffler of coupled tubes with or without absorbing materials is experimentally studied in the present paper. Finite amplitude oscillations superimposed on cold gas flow is created by a reciprocating engine of a compressor. For coupled tubes, the experimental results had been taken at different speed (different initial frequencies). Capacitive pressure transducers are used to record pressure history variations. These transducers were connected directly to computer through a Lab View soft ware. Also the power spectrum is calculated from experimental data.
In the case of pipe system arrangement consists of large cavity followed by small one without absorbing materials, it is found that there are no big change in the recorded pressure traces before and after the big cavity. In contrast, in case of existence absorbing materials embedded along the big cavity, smooth pressure waves are noticed at the exit of the large cavity. Moreover, adding glass-wool in the adopted double cavity muffler reduces the outlet noise at the muffler exit and increase in pressure downstream of the large cavity based on the generated complex pattern in the system. Results of this investigation are useful for the muffler designers in order to reduce the output noise levels.
Noise waves,Muffler,Acoustic streaming,Sound radiation,Wave finite amplitude,Linear and nonlinear acoustics
https://erjm.journals.ekb.eg/article_67274.html
https://erjm.journals.ekb.eg/article_67274_57eb8acfea32397ddbc6908af7b45d48.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
PERFORMANCE CHARACTERISTICS OF THE SERIES HYBRID ELECTRIC VEHICLE WITH HYBRID MODE
225
231
EN
Ibrahim A. M.
Abdel-Halim
Faculty of Engineering, Benha University, Egypt
M. Z.
Elsherif
Faculty of Engineering, Benha University, Egypt
Mohamed M.
Fathy
Faculty of Engineering, Benha University, Egypt
10.21608/erjm.2011.67275
In this paper, the equations describing the performance of the series hybrid electric vehicle are derived. Performance characteristics for each part in the vehicle system are obtained when the vehicle is operating in hybrid mode in which the drive motor takes its power from main and peaking power sources.
Induction motor,electric vehicle,hybrid electric vehicle,hybrid mode
https://erjm.journals.ekb.eg/article_67275.html
https://erjm.journals.ekb.eg/article_67275_cf70d5af91b7299d0c51e569dd46dad1.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
SIMULATION ANALYSIS OF DOUBLY FED INDUCTION GENERATOR FOR WIND ENERGY CONVERSION SYSTEM USING MATLAB
233
240
EN
H. M. B.
Metwally
Electrical Power Engineering Department, Faculty of Engineering,
Zagazig University, Zagazig, EGYPT
M. A.
Farahat
Electrical Power Engineering Department, Faculty of Engineering,
Zagazig University, Zagazig, EGYPT
M. A.
Sadek
Electrical Power Engineering Department, Faculty of Engineering,
Zagazig University, Zagazig, EGYPT
10.21608/erjm.2011.67276
The doubly fed induction generator (DFIG), used as a wind turbine generator, has recently received a great attention from the industrial and scientific communities. The reasons of that are: it easily produces a fixed frequency from the stator windings when the rotor is driven at variable speed, and the excitation power electronic converter feeding the rotor windings needs to be rated at a fraction of the nominal power of the generator. The aim of this paper is to develop a mathematical model for the Wind Energy Conversion system (WEC) driving a DFIG. The steady-state simulation model of the DFIG is developed using MATLAB. Simulation analysis is performed to investigate the DFIG characteristics including torque, real power and reactive power with speed (i.e. slip) characteristics. Comparison with measured characteristics shows a close agreement which indicates that the model is accurate.
https://erjm.journals.ekb.eg/article_67276.html
https://erjm.journals.ekb.eg/article_67276_d5e3e62dfbfa6ddee2aa8ab0dd5adcf4.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
FAULT DETECTION OF A THREE PHASE INDUCTION MOTOR
241
247
EN
H. M.
Badr
Beheira Company for Electricity Distribution (BCED), Beheira, Egypt
F. A.
Abdel-Kader
Electrical Machines, Faculty of Engineering,
Minoufiya University, Shebin-El-Kom, Egypt
10.21608/erjm.2011.67277
The use of induction motors in industry is extensive. These motors are exposed to a wide variety of environments and conditions, which age the motor and make it subject to inter-turn faults. One major cause of these faults is breakdown of the turn insulation leading to damage the ground insulation wall. Early detection of inter turn shorts during motor operation would eliminate consequential damage to adjacent coils and the stator core reducing repair costs and motor outage time. This paper deals a modeling simulation and detection of induction motor inter turn short circuit faults. A new detection method for inter-turn short circuit faults in stator windings using sum of stator currents was presented. The simulation and experimental results are reported to demonstrate the effectiveness of the proposed technique.
Simulation,inter turn short circuit,Fault Detection,three phase induction motor
https://erjm.journals.ekb.eg/article_67277.html
https://erjm.journals.ekb.eg/article_67277_29ada00daab989edc45e2c158a23027c.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
OPTIMAL CHOICE AND DESIGN OF DIFFERENT TOPOLOGIES OF DC-DC CONVERTER USED IN PV SYSTEMS, AT DIFFERENT CLIMATIC CONDITIONS IN EGYPT
249
258
EN
M. A.
Farahat
Electrical Power Engineering Department, Faculty of Engineering,
Zagazig University, Zagazig, EGYPT
H. M. B.
Metwally
Electrical Power Engineering Department, Faculty of Engineering,
Zagazig University, Zagazig, EGYPT
A. A. A.
Mehrem
Electrical Power Engineering Department, Faculty of Engineering,
Zagazig University, Zagazig, EGYPT
10.21608/erjm.2011.67278
This paper investigates the effect of changing cell temperature and intensity of solar radiation on the choice and design of different topologies of DC-DC converter commonly used in PV systems. Under fluctuation of climatic conditions, the MPP of PV generator will change. The MPPT must adjust the converter duty cycle to track the new MPP. Thus the converter must be chosen to be able to match the MPP under different atmospheric conditions. In addition, when the duty cycle changes as a result of changed climatic conditions, the boundary of the converter design parameters will change. So, these parameters must be chosen to achieve the best performance at all. All these aspects are studied in this work and important results are obtained.
MPPT,Maximum power point tracker,DC-DC converter,Optimal design,PV systems
https://erjm.journals.ekb.eg/article_67278.html
https://erjm.journals.ekb.eg/article_67278_14882d333e133c17d686bd9cd1bc6f17.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
TRANSMISSION CONGESTION MANAGEMENT USING FUZZY LINEAR PROGRAMMING TECHNIQUE IN COMPETITIVE MARKET
259
265
EN
Adel A.
Abou El-Ela
Electrical Power Department, Faculty of Engineering,
*Minoufiya University, Minoufiya, Egypt
Ahmed
Shobir
Tanta University, Tanta, Egypt
S.
Dawoud
Tanta University, Tanta, Egypt
10.21608/erjm.2011.67279
This paper presents a proposed optimization technique (POT) for transmission congestion management problem in competitive power systems at normal and emergency conditions. The fuzzy linear programming (FLP) is used as intelligent optimization technique for solving transmission congestion management problem. Two shapes modeling of fuzzy memberships are used and compared with the linear programming technique, as a conventional optimization technique. The POT has two objectives which are: Minimizing the cost of generation, maximizing the profit. However the profit is the difference between the market revenue and market payment. A multi–objective function of fuzzy technique is used to find the maximum profit for different shapes of fuzzy membership models. Four standard test systems are used to extensive study of the POT. One of these test systems is a real system of the Egyptian United Network. Simulation results show that the POT is more accurate and efficient, especially with large scale power system.
congestion,Deregulation,FLP,competitive,optimal dispatch and emergency
https://erjm.journals.ekb.eg/article_67279.html
https://erjm.journals.ekb.eg/article_67279_2c57541caddda941555f9796772ab671.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
SVC WITH ANN CONTROLLER FOR A SUPERCONDUCTING GENERATOR
267
273
EN
G. A.
Morsy
Electrical Engineering Department, Faculty of Engineering,
Minoufiya University, Shebin El-Kom, Egypt
R. A.
Amer
Electrical Engineering Department, Faculty of Engineering,
Minoufiya University, Shebin El-Kom, Egypt
H. A.
Yassin
Electrical Engineering Department, Faculty of Engineering,
Minoufiya University, Shebin El-Kom, Egypt
10.21608/erjm.2011.67280
This paper presents the design of an artificial neural network (ANN) controller for static var compensator (SVC) to improve the stability and the performance of a superconducting generator (SCG). The SVC is also equipped with conventional proportional integral derivative (PID) controller designed according to the pole placement technique. The ANN controller patterns are gathered from unsupervised (self learning) ANNs-PID using an optimization technique. These pattern groups are chosen to cover most operating conditions based on P-Q plane. The present control strategy is tested on a SCG connected to an infinite bus system. To achieve a high degree of accuracy, the system is represented by a detailed non-linear model including the SCG, SVC, the transmission system and non-linear constraints. The simulation results reveal that the proposed ANN-SVC controller achieves further enhancement of the system performance and stability over a wide range of operating conditions and under sever disturbances compared with conventional PID-SVC controller.
Power system control,Superconducting generator,Static VAR Compensator,ANN control
https://erjm.journals.ekb.eg/article_67280.html
https://erjm.journals.ekb.eg/article_67280_c1dbe0ea0b6f107c7255352d3dbe4486.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
INVESTIGATING THE PERFORMANCE OF SUBMERGED HORIZONTAL PLATES AS WAVE BARRIER
275
284
EN
M.B
Ezzat
Hydraulics Research Institute, National Water Research Centre, Egypt
K.
Ramadan
Hydraulics Research Institute, National Water Research Centre, Egypt
E.Y
Helal
Civil Engineering Department, Minoufiya University, Egypt
M.M.F
Sobeih
Civil Engineering Department, Minoufiya University, Egypt
10.21608/erjm.2011.67281
The wave transmission and energy dissipation characteristics were investigated experimentally in the Hydraulics Research Institute (HRI) wave basin. A horizontal surface wave plate barrier was used in order to study its engineering characteristics and to establish its design criteria. .The investigation was carried for a wide range of wave heights and periods using JONSWAP spectrum. The structure was placed and tested at three different water depths. The plate moved up to test different submergence depths. It was found that, the submerged horizontal plate reduced the transmitted wave and increased the wave energy dissipation.
Transmission coefficient,Energy dissipation coefficient,submerged plate,Relative plate width,relative submergence dept
https://erjm.journals.ekb.eg/article_67281.html
https://erjm.journals.ekb.eg/article_67281_8e80e48f55d41fd808a7b0d4ce82d6ab.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
FLEXURAL CAPACITY OF HIGH PERFORMANCE SELF COMPACTING RC BEAMS UNDER DIRECT FIRE
285
291
EN
A. A. M.
Badawy
Materials Engineering Dept., Faculty of Engineering, Zagazig, Egypt
M. H.
Seleem
Materials Engineering Dept., Faculty of Engineering, Zagazig, Egypt
A. E. K.
Gabal
Materials Engineering Dept., Faculty of Engineering, Zagazig, Egypt
A. M.
El shihy
Structural Engineering Dept., Faculty of Engineering, Zagazig, Egypt
10.21608/erjm.2011.67282
This work analyses the structural behavior of high performance self compacting reinforced concrete (RC) beams under direct fire. Concrete strength of about 130 MPa was investigated. Six reinforced concrete beams represents three types of concrete mixes were investigated. The first mix was high performance self compacting concrete (HPSCC) without fibers. The second mix was HPSCC with the presence of steel fibers (SF). The third mix was HPSCC with hybrid fibers, SF and two types of polypropylene fibers (micro-polypropylene and polyolefin). Three beams representing the three mixes were tested at room temperature without exposure to fire. The other corresponding three beams were tested under direct fire, while they were loaded at 45% from the fracture load of the corresponding three beams tested at room temperature to failure. All beams were tested under 3-points bending. Experimental results clearly indicated the superior effect of adding hybrid fibers to such concrete in reducing explosive spalling and increasing flexural capacity of RC beams when exposed to direct fire.
High performance concrete,Self compacting concrete,RC beams,Fire,Hybrid Fibers,Steel fibers1
https://erjm.journals.ekb.eg/article_67282.html
https://erjm.journals.ekb.eg/article_67282_768e30845ec9c4c9a03836f04253ab0d.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
THE MECHANICAL BEHAVIOR OF FIBER REINFORCED HIGH PERFORMANCE SELF COMPACTED CONCRETE AT HIGH TEMPERATURES
293
301
EN
A. A. M.
Badawy
Materials Engineering Dept., Faculty of Engineering, Zagazig, Egypt
M. H.
Seleem
Materials Engineering Dept., Faculty of Engineering, Zagazig, Egypt
A. E. K.
Gabal
Materials Engineering Dept., Faculty of Engineering, Zagazig, Egypt
A. M.
El shihy
Structural Engineering Dept., Faculty of Engineering, Zagazig, Egypt
10.21608/erjm.2011.67283
In this paper, an experimental work was carried out to study the effect of high temperatures on the strength of high-performance self compacting concrete (HPSCC). Four concrete mixes were investigated. The first mix represented HPSCC without fibers. The second mix represented HPSCC including steel fibers. The third mix represented HPSCC including steel and micro-polypropylene fibers. The fourth mix represented HPSCC including steel, polypropylene and polyolefin fibers. Compressive, tensile and flexural strengths were measured at room temperature (RT) and after exposure to high temperatures of 200<sup>o</sup>C, 400<sup>o</sup>C, 600<sup>o</sup>C and 750<sup>o</sup>C for 2 hours. The residual unstressed test method was followed. Microscopic examination was performed on concrete samples from the four mixes at RT and after exposure to high temperatures. The results showed that incorporating hybrid fibers seems to be a promising way to enhance the resistance of HPSCC to thermally induced explosive spalling and increase the residual strengths.
High-performance concrete,Self compacted concrete,Residual strengths,Hybrid Fibers,High temperatures
https://erjm.journals.ekb.eg/article_67283.html
https://erjm.journals.ekb.eg/article_67283_9aabe67d7393965925c75e60bf3c993e.pdf
Menoufia University, Faculty of Engineering
ERJ. Engineering Research Journal
1110-1180
34
3
2011
07
01
MEASURING BRIDGE FLEXURAL STRENGTH USING CONTROLLED TRAFFIC DYNAMIC TEST
303
309
EN
Ahmed S.
Hashad
Construction Research Institute, National Water Research Center, Egypt
10.21608/erjm.2011.67284
A steel bridge was subjected to loads which are over its capacity load. Strengthening works were done to allow passing of the required load. To ensure that the strengthened works gained enough increase in flexure stiffness, a dynamic test using controlled traffic technique was performed. The bridge dynamic characteristics before and after strengthening work and just after passing of load were determined. Experimental studies were carried out on two spans for a multiple simple spans bridge using a certain vehicle passing over the bridge. The bridge acceleration response was measured and the bridge fundamental frequency was determined for each span before and after strengthening and after passing of load. The results were used to evaluate the bridge flexure stiffness.
Dynamic Testing,bridges,Impact Factor,Dynamic Response,Strengthening Evaluation
https://erjm.journals.ekb.eg/article_67284.html
https://erjm.journals.ekb.eg/article_67284_bdd6c66c749b4ee2bf7fb6bbb4ebcc4d.pdf