FLEXURAL BEHAVIOR OF HIGH STRENGTH FIBER REINFORCED CONCRETE BEAMS AS AFFECTED BY RIB GEOMETRY AND GRADE OF MAIN STEEL UNDER STATIC LOADS
Rashwan
M. M
Civil Engineering Department, Faculty of Engineering, Assuit University, Assuit,
Egypt
author
Hosny
M. Soghair
Civil Engineering Department, Faculty of Engineering, Assuit University, Assuit,
Egypt
author
Aly
Abdel-Zaher ELsayed
Civil Engineering Department, Faculty of Engineering, Assuit University, Assuit,
Egypt
author
Ali Mohamed
Abdallah Abou-Zied
General Authority of Educational Buildings, Sohag, Egypt
author
text
article
2006
eng
The need of high-performance concrete is increasing in recent years for the use in high rise building and the new breed of concrete gravity platforms for offshore structures. The use of high strength concrete needs high percentage of steel reinforcement to get the full capacity of the flexural strength of the member. Hence, the need of using high grade of steel reinforcement and different fibers to concrete mixes is necessary from the economical point of view. So, different ribs are used for the increase of bond strength between steel reinforcement and highperformance concrete. But these materials were brittle and the failure also was brittle. So, fibers are used to enhance their composite properties. There is little information in the available literature about the flexural behavior of high-performance and high-performance fiber-reinforced concrete beams with different rib geometry under partial bond. Therefore, this paper focuses on the application of different types of fibers and steel rib geometry in the technology of high strength R.C. rectangular beams having fc=900kg/cm2 and study their flexural behavior under static loading. Test results showed that, the failure mode, cracks pattern and flexural behavior of high strength and fiber-high strength reinforced concrete beams were clearly affected by rib geometry and quality of the main steel and fibers type. The values of cracking and ultimate load carrying capacity of R.C. tested beams were increased with the increase of the grade of the main steel and its relative rib area (Fy from 3100 to 4750 kg/cm2 & αsb from 0.0 to 0.10) by about 65 & 76% respectively for beams without fibers. Also, they were increased by about 80 & 82% for beams with polypropylene fibers and by about 86 & 83% for beams with harex steel fibers. The addition of fibers to concrete mixes of R.C. beams has greatly improved their ductility by increasing the ultimate strains under maximum compressive stresses and improved the crack propagation patterns for all tested (HPFRC) beams.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
587
611
https://jesaun.journals.ekb.eg/article_110547_44b3b888455d9daf0bf27c099218888b.pdf
dx.doi.org/10.21608/jesaun.2006.110547
FLEXURAL BEHAVIOR AND FAILURE MECHANISM OF NORMAL STRENGTH R.C. BEAMS CONTAINING ALKALI INDUSTRIAL WASTES AND REINFORCED WITH DIFFERENT AMOUNTS OF MAIN STEEL UNDER STATIC LOADING
Rashwan
M. M.
Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut,
Egypt.
author
Assaf
K. A.
Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut,
Egypt.
author
text
article
2006
eng
Modern production of high qualiy concrete is closely connected with wide use of different types of admixtures, which in small doses allow to obtain the required physical, technical, exploitation and economical properties of concrete. Improvement of the mechanical properties of normal strength R.C. beams in flexure by using plasticizing chemical admixtures is becoming on increasing by popular retrofit technique among researchers and engineering world wide. Plasticizing admixtures, which contain in their composition alkali industrial wastes, represent practical interest especially for our local country conditions. Therefore, the main purpose of the project described in this paper is to give better and full understanding of the flexural behaviour and failure mechanism of normal strength R.C. rectangular beams containing in their compositions alkali wastes and secondary products of oil and cellulose paper industries and reinforced with different amounts of steel under static loading. The main variables studied in this research were: three different types of plasticizing admixtures, which contain in their compositions different amounts of alkali wastes from secondary products of oil and cellulose paper industries, and three different types of beams reinforced with different amounts of tension steel bars(under reinforced -type A, balanced reinforced -type B,and over reinforced - type C) . The experimental results showed that, the suggested plasticizing admixtures containing amounts of alkali industrial wastes in their compositions have a good effect on increasing the ultimate capacity of under and balanced R.C. beams by about 27% & 77% respectively. Also, they decrease their maximum central deflection by about 20% & 18% respectively compared to the control tested beams. These admixtures, especially type (SM-S) decrease the cracking capacity of under reinforced beams by about 20% and increased it for balanced reinforced beams by about 40% . They increase factor of safety of tested beams against complete failure by about 90% for under reinforced, 117% for balanced reinforced and 19% for over reinforced beams. The suggested admixtures have a bad influence on the flexural behavior of over reinforced tested beams compared to the control ones.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
613
633
https://jesaun.journals.ekb.eg/article_110551_8463005bfd92659ddb6754f8b29229e6.pdf
dx.doi.org/10.21608/jesaun.2006.110551
THREE-DIMENSIONAL ANALYSIS OF FLEXIBLE PAVEMENTS SUBJECTED TO TRAFFIC LOADS USING FINITE ELEMENT TECHNIQUE
Abd Alla
E. M.
Civil Engineering Department, Faculty of Engineering, Assiut University,
Assiut, Egypt.
author
text
article
2006
eng
To predict pavement responses and performance due to external working loads, it is necessary to estimate stresses and deformations through pavement. When the induced strains are relatively small, they are usually evaluated using the theory of elasticity. Boussinesq's theory is used for this estimation through homogeneous soil. These responses in case of layered pavement system are less than those obtained for the ideal homogeneous case depending upon the stiffness of the layers. Semianalytical solutions are available to analyze the behaviour of elastic layered soil deposits subjected to surface loads. For more complex cases of soil deposits or loading conditions, it is necessary to perform numerical analysis using finite element technique. In addition, most of pavement materials do not linearly perform under the action of traffic loading. In this paper, the ANSYS version-8 program is used to analyze in three dimensions the behaviour of a layered pavement system under static loads indicating load transmission issues for a wide variety of materials stiffness, tire pressures and axle loads with dual wheels. Also linear and non linear analyses were preformed for different previously mentioned items. In this research, the pavement is modeled as a multilayered elastic system composed of a subgrade assumed to be an infinite medium upon which layers of finite thickness infinitely extended horizontally are laid. Furthermore, it is assumed that vertical loading, such as dual wheel loads are simultaneously applied to obtain stresses and deflections through the road pavement. On the basis of this research, remarkable conclusions are drawn out.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
635
659
https://jesaun.journals.ekb.eg/article_110552_9bdfa1e050f908822840e9e88ca37db2.pdf
dx.doi.org/10.21608/jesaun.2006.110552
EFFECT OF SPACING OF FASTENERS USED TO ATTACH THE CORRUGATED SHEAR PLATE TO THE ENVELOPE FRAME ON ITS ELASTIC BUCKLING BEHAVIOR
F. M.
El –Amin
Civil Engineering Department, Faculty of Engineering, Assiut University,Assiut, Egypt
author
M. F.
Abdel–Khalek
Civil Engineering Department, Faculty of Engineering, Assiut University,Assiut, Egypt
author
Khairy
Hassan A.
Civil Engineering Department, Faculty of Engineering, Assiut University,Assiut, Egypt
author
E.
Asham
Civil Engineering Department, Faculty of Engineering, Assiut University,Assiut, Egypt
author
text
article
2006
eng
The search for light weight and efficient structural elements is a continuing process. Reducing the structural weight and improving the load carrying capabilities of steel frames will allow designers to add additional capabilities while reducing cost. Corrugated steel plate shear walls offer several advantages when used to resist both vertical and lateral forces in a building. This paper is devoted to the buckling behavior of steel frames with corrugated steel shear walls. The system consists of two parts, the first one is the envelope steel frame and the second is the infill corrugated steel shear wall. The corrugated steel plates are connected to the surrounding frame beam and columns. The buckling load factor of this system depends on the interaction of many factors including the corrugation configuration of steel plate, the angle of corrugation, the depth of corrugation, the thickness of corrugated plate and the spacing of the fasteners used to attach the corrugated sheets to the steel frame, in addition to the restraint conditions and the external load action. Steel frames with trapezoidal or triangular corrugated steel shear panel were modeled using the finite element software Cosmos/m 2.8 and a linear analysis was performed. In the current study, elastic buckling behavior of steel frames with corrugated shear wall is investigated using finite element approach. The elastic buckling behavior is expressed as normalized load factor which is defined as the ratio between the buckling load of the frame with corrugated plate to the buckling load of the frame without corrugated plate. Parametric analyses were carried out to investigate the effect of spacing between fasteners used to attach the corrugated plate to the envelope frames without or with one, two, and three stiffeners for frames subject to vertical loads only or vertical loads with horizontal loads. The results showed that the spacing between fasteners has significant influence on the elastic buckling behavior of the steel frames with corrugated shear wall.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
661
688
https://jesaun.journals.ekb.eg/article_110554_e51563031f43c3bae162b3993274fd8d.pdf
dx.doi.org/10.21608/jesaun.2006.110554
EFFECT OF SURFACE CRACKING ON RESPONSES OF FLEXIBLE PAVEMENTS STRUCTURE
Hassan
Y. Ahmed
Associate Professor, Civil Engineering Department, Faculty of Engineering, Assiut
University, Assiut, Egypt
author
text
article
2006
eng
Pavement cracking is a major factor of failure in surface of pavements structure, In spit of this, seldom intention has been considered how is the pavement structure has been affected when surface cracking are presented and/or progressed. On the other hand, higher costs are presented for maintenance and repair. Generaly, pavement surface conditions in terms of pavement surface cracks, rutting, roughness and pit-holes are the main factors used to establish criteria for pavement maintenance and repair. Structural adequacy factor of the pavement is usualy neglected. The accurate decision making processes for maintenance and repair works must be done not only due to functional conditions, but also due to structural conditions. Finite element analysis is used in this research paper using the ANSYS-10 program. SOLID45, and SOLID185 elements represent unbounded layers, and asphalt cement layers respectively to evaluate the stresses in a flexible pavement system under different conditions. These conditions were: (1) The vertical load of a single wheel was modeled as uniform pressure placed directly at the edge of the transverse crack. (2) The effects of seasonal differentiation of the pavement material properties during winter and summer. and (3) Various crack depthes which represent 25% , 50%, 75% and 100% of the asphalt layer thicknesses are also, considered in the analysis. The horizontal normal stresses along the top and bottom of the AC layer, and vertical stresses at selected points in the base has been investigated. Comparisons of stresses finally were made for all studied cases. It is found that the presence of crack in the AC layer significantly increases both the vertical stresses and the horizontal stresses in the AC layer which indicate a greater potential for tensile stresses outside the tire treads than in the middle of the treads. With the wheel load located at the edge of transverse crack there is considerable change in the values of horizontal and vertical normal stresses in the asphalt pavement layers. Seasonal variation has significant effect on the normal stresses values, where the maximum horizontal tension stresses (σyy ) is higher in winter than that in summer with about 66%. Finally, it is recommended that at crack depth ratio (CDR) 50% pavement must be rehabilitated to prevent initiation of new cracks or rutting of asphalt pavement surface. In other side the winter season is considered the critical for initiation of cracking, as summer season is considered critical for rutting occurrence.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
699
717
https://jesaun.journals.ekb.eg/article_110556_5465ebabad7b06aac97561cc39f72206.pdf
dx.doi.org/10.21608/jesaun.2006.110556
STUDYING THE PERFORMANCE OF A COUNTER-FLOW, VERTICAL EVAPORATIVE HUMIDIFIER
Maher
A. Mohamed
Department of Mechanical Power Engineering and Energy ; Faculty of
Engineering, Minia University, Minia, Egypt
author
Mohamed
R. Diab
Department of Mechanical Power Engineering and Energy ; Faculty of
Engineering, Minia University, Minia, Egypt
author
Ramadan
Bassiouny
Department of Mechanical Power Engineering and Energy ; Faculty of
Engineering, Minia University, Minia, Egypt
author
Hussein M. Maghrabie
M. Maghrabie
Department of Mechanical Power Engineering and Energy ; Faculty of
Engineering, Minia University, Minia, Egypt
author
text
article
2006
eng
The evaporative humidifier is an energy efficient unit that can be an alternative to other costly cooling systems; depending on climate conditions and building load characteristics. Heat and mass transfer processes occur inside the humidifier as a result of air contact with water spray. The present experimental study aims at investigating some common parameters that have a direct or indirect effect on the evaporative humidifier performance. Among these parameters are: the number of spray nozzles, nozzle arrangements, water-air mass flow rate ratio, and packing material specifications such as: location, z, thickness t, and number of trays. The results showed that the water-air mass flow rate ratio has a significant effect on the humidifier performance. The results also indicated that an increase in the humidifier saturation efficiency, ε, was noticed as the number of spray nozzles increased for the same water flow rate. However, when keeping the water spray supply pressure constant, a decrease in the saturation efficiency was recorded as the number of spray nozzles increased. Furthermore, placing a packing material inside the humidifier results in enhancing the efficiency due to increasing the mass transfer surface area and air residence time.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
719
732
https://jesaun.journals.ekb.eg/article_110607_51d59dfc10c7f217472985ac0b2c5ea7.pdf
dx.doi.org/10.21608/jesaun.2006.110607
PERFORMANCE ANALYSIS OF CYLINDRICAL TYPE AIR EJECTOR
W. A.
Aissa
Mechanical Power Department, High Institute of Energy, South Valley
University, Aswan, Egypt.
author
text
article
2006
eng
Performance tests were conducted for an air ejector entraining two secondary jets whose axes are coaxial of that of primary stream. A unique ejector housing was constructed to receive both the convergent or convergent-divergent primary nozzle and the cylindrical mixing chamber. The air ejector under investigation has nozzle throat -tocylindrical section area ratio of 0.12. The investigation is conducted for ejector having cylindrical length-to-diameter ratio, which varies from 2.31 to 23.08. It covers a range of spacing from –1 to 0.5 of cylindrical lengths and of secondary to ambient pressure ratio of 1.0. The recorded axial distributions of the static wall pressure are plotted in nondimensional forms and the extent of consistency of the profiles is shown. The induced air flow rate ratio is plotted for the measured primary to secondary stagnation pressure ratio range. Results offered a valuable appreciation of the effect of the cylindrical length and nozzle spacing-todiameter ratios on both wall pressure distribution and jet entrainment capacity. The occurrence of flow choking in both the convergent or convergent-divergent primary nozzle was ensured.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
733
745
https://jesaun.journals.ekb.eg/article_110609_06a63283d01319133eaa130ce15dad56.pdf
dx.doi.org/10.21608/jesaun.2006.110609
WEAR RESISTANCE OPTIMIZATION OF COPPER, LEAD, TIN ALLOYS
K. N.
Abushgair
Mechanical Engineering Department, Faculty of Engineering Technology,
Al-balqa' Applied University, Amman, Jordan
author
text
article
2006
eng
In the present study different copper-lead-tin alloys were prepared by casting. A wear test device was designed and manufactured to study the wear resistance of these alloys under different values of contact forces and sliding velocities. The data obtained from the wear test is modeled by the Adaptive Nearo Fuzzy Inference System (ANFIS) to predict an alloy of the highest wear resistance. Comparison between predicted an experimental wear results show good agreement. There are more than one combination of the considered copper alloy that show optimum resistance to wear, namely an alloy composed of (Cu = 75 %, Pb = 5 %, Sn = 20 %), and that composed of (Cu = 85 %, Pb = 5 %, Sn = 10 %).It was also found that the increase of lead decreases the wear resistance, while percentage of tin above 7 % increases the wear resistance of these copper base alloys. This is attributed to the change in the micro-structure of the tested alloys.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
747
764
https://jesaun.journals.ekb.eg/article_110611_672527a03b85c27c8c2822747daa68d4.pdf
dx.doi.org/10.21608/jesaun.2006.110611
EFFECT OF PROCESS VARIABILITY ON THE ECONOMIC VALUES OF AVERAGES CONTROL CHART PARAMETERS
A.
Wazeer
Department of Production Engineering, Industrial Education College ,
Beni-Suef, Egypt
author
text
article
2006
eng
When the averages control chart is applied to monitor a manufacturing process, three parameters should be determined, sample size, sampling interval between successive samples and the control limit for the chart. This study shows how the effect of process variability caused by common and assignable causes on the values of averages control chart parameters. An example is presented and then based on this example, sensitivity analysis is performed to show the direction of control chart parameters changes in the presence of changes in the magnitude and frequency of process shift and the costs of discovering and correcting the causes of these shifts
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
765
778
https://jesaun.journals.ekb.eg/article_110613_44f64722e9876e121da11db3102db32a.pdf
dx.doi.org/10.21608/jesaun.2006.110613
ROBUST CONTROL BASED ON H APPROACH FOR A WIND DRIVEN INDUCTION GENERATOR CONNECTED TO THE UTILITY GRID
A. A.
Hassan
Electrical Engineering Department, Faculty of Engineering , El -Minia University, Egypt
author
Yehia
S. Mohamed
Electrical Engineering Department, Faculty of Engineering , El -Minia University, Egypt
author
Ali M.
Yousef
Electrical Engineering Department, Faculty of Engineering, Assiut University, Egypt
author
A. M.
Kassem
Electrical Engineering Department, Faculty of Engineering, Assiut University, Egypt
author
text
article
2006
eng
This paper proposes the application of H∞ synthesis to design a robust controller for regulating the voltage and frequency of a wind generation system. The controlled system consists of a wind turbine that drives an induction generator connected to the utility grid through asynchronous AC-DC-AC link. The main control objective is to regulate the DC link voltage and to track and extract maximum available wind power. This is accomplished via controlling the firing angles of the rectifier and the inverter. The complete nonlinear dynamic model of the system has been described and linearized around an operating point. Also, the design problem of the H∞ controller has been formulated in a standard form with emphasis on the selection of the weighting functions that reflect robustness and performance goals. The proposed system has the advantages of robustness against model uncertainties and external disturbances, fast response and the ability to reject noise. The performance of the wind generation system with the proposed controller has been tested through a step and sinusoidal changes in reference input power. In addition, detuned system parameters are assumed. Simulation results confirm that good dynamic performance of the proposed wind energy scheme has been achieved.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
779
797
https://jesaun.journals.ekb.eg/article_110557_1a683538645b233c3831e61e3c3db72e.pdf
dx.doi.org/10.21608/jesaun.2006.110557
A NEURO-FUZZY CONTROL OF A DC SHUNT MOTOR
Ahmad
N. Al-Husban
Al-Balqa Applied University, College for Engineering Technology, Amman, Jordan
author
text
article
2006
eng
This paper presents a novel methodology for designing a neuro-fuzzy control for controlling systems with nonlinearities of known structures and parameters. Due to the different nonlinearities inherent in the system dynamics, we propose a neural-fuzzy control that processes both numerical and linguistic information. The proposed control has some characteristics and advantages, the inputs and outputs are fuzzy numbers or numerical numbers, the weights of the proposed neuro-fuzzy control are fuzzy weights owing to the representation forms of the alpha-level sets. Different tests are performed to study the effects of different alpha-cut techniques on the closed loop system performance, the first test addresses the effect of alpha-cut techniques, the second test is related to the effect of number of labels and finally the effect of defuzzification techniques. This approach is able to process and learn numerical information as well as linguistic information. It can be used as an adaptive fuzzy controller. As a model example of nonlinear system, the DC shunt motor is considered due to its importance in electric drive. Computer simulations are included to help in conducting the study.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
799
811
https://jesaun.journals.ekb.eg/article_110559_ea80253a87d5d61084426ac10014a00b.pdf
dx.doi.org/10.21608/jesaun.2006.110559
IMPROVED ALGORITHM FOR A DC SHUNT MOTOR USING DIFFERENT DEFFUZZIFICATION TECHNIQUES
A. N.
Al-Husban
Al-Balqa Applied University, faculty for Engineering Technology, AmmanJordan
author
text
article
2006
eng
This paper considers the fuzzy control of a non-linear dynamic system. The approach is known to be model-free and utilizes the field experience with running and supervising the process by human expertise. The advices given by the expert for proper running of these systems are given in the form of recipes full of linguistics. These linguistics can be turned into linguistic variables with limited sets of labels by the designer and to be the primitive seeds for what is called knowledge base. This base is kept in the memory of a computer unit. Assume that a running condition is given and has to be transferred into equivalent linguistic variables, in order to use the knowledge base and induce the output in a form of linguistic variables. Knowing that the linguistic variables is the same as fuzzy variables, the process of a fuzzy control can be stated as the three step procedure, a fuzzification stage, an inference stage, and finally a defuzzification stage, in which a crisp value is obtained for the process control input. The defuzzification stage is not unique and different techniques have been proposed in the literature. Starting from the centroid method up to the maximum principle method, the methods vary between themselves in complexity and time consumed by the computer unit. This, in turn, could result in different time responses for the given nonlinear dynamic systems. The paper concentrates on the effect of the defuzzification techniques on the transient response of a DC shunt motor taken as a model example of non-linear systems. A comparative study is given supported by computer simulation for each case.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
813
822
https://jesaun.journals.ekb.eg/article_110560_96fcb88edd93d981b34b6495bde4b918.pdf
dx.doi.org/10.21608/jesaun.2006.110560
PERFORMANCE ANALYSIS FOR QOS PROVISIONING IN MPLS/DIFFSERV- BASED IP NETWORKS WITH NON-PREEMPTIVE PRIORITY QUEUING SYSTEM
Ibrahim
I. Ibrahim
Faculty of Engineering, Helwan University, Cairo, Egypt
author
Abd ELrahman
H. Elsawy,
Faculty of Engineering, Helwan University, Cairo, Egypt
author
Mahmoud
M. Elmesalawy
Faculty of Engineering, Helwan University, Cairo, Egypt
author
text
article
2006
eng
A typical operating environment of a packet switching (store-and-forward) computer communication network is that it is shared by many users with different classes of packets. Packets may be classified in a very general fashion by types of users, messages, applications, transactions, response time requirements, packet parameters such as packet rate and length, and by network parameters such as source-destination and path length. A well-designed network must provide access and performance assurance to all packet classes. An architecture for designing such a communication network is presented in [1]. This architecture is based on MPLS as an underlying technology used for IP transport and DiffServ-like mechanisms for QoS provision which use simple priority queuing to differentiate several traffic classes by assigning them different delay targets. In this paper, we introduce a mathematical model for performance evaluation for QoS Provisioning in MPLS/DiffServ-Based IP Networks. This mathematical model is formulated to evaluate the performance of the proposed architecture described in [1]. Two parts are considered in the evaluation. One, is the analysis of the proposed QoS routing algorithms that are used in the proposed architecture, the other is the analysis of the average packet delay over the network. An M/G/1 Non-preemptive priority queuing system is used as the evaluation model to analyze the average packet delay over the network. Relative MPLS/DiffServ with Non-Preemptive Priority Queuing system performance compared to MPLS/DiffServ without priority (FIFO)[2] is evaluated. The results indicate that for well-designed MPLS/DiffServ equipments, original IP packet delay can be reduced by 39% or more with FIFO queuing system [2] and 42% or more with Nonpreemptive priority queuing system
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
823
841
https://jesaun.journals.ekb.eg/article_110564_857741032f7a58604b59e1faa7378272.pdf
dx.doi.org/10.21608/jesaun.2006.110564
COMPARATIVE EVALUATION OF MOBILE AD HOC NETWORK (MANET) PROTOCOLS ROUTING
Dr. Osama
El Ghandour
Electronics & Communications and Computer Engineering
Department, Helwan University, Cairo, Egypt
author
O.
El-Ghandour
Helwan University, Electronics & Communications and Computer
Engineering Department, Cairo, Egypt.
author
H.
Ramadan
Helwan University, Electronics & Communications and Computer
Engineering Department, Cairo, Egypt.
author
text
article
2006
eng
Wireless Ad Hoc networks are relatively new and are gaining ground in research due to promises they offer. Wireless Ad hoc networks do not require predefined configuration and have no fixed infrastructure. They are self-organizing and self-configuring networks. Several protocols have been developed that vary in the performance and complexity. Most routing protocols for mobile ad hoc networks, such as: Ad Hoc On Demand Distance Vector Protocol (AODV), Dynamic Source Routing (DSR) are designed without explicity considering quality of service of the generated route. These routing protocols provide the capability for establishing minimum hop paths between nodes on a best effort basis regardless of QoS. In our work, we analyze the performance of these protocols and we present an efficient scheme for support QoS over MANET named Hierarchical Dynamic Source Routing protocol (HDSR). The performance aspects we study are fraction of routing overhead, end-to-end delay and throughput. It was shown via computer simulations that (HDSR) improves these performance aspects in wireless mobile ad hoc networks compare to other protocols.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
843
857
https://jesaun.journals.ekb.eg/article_110566_3caa21998b4658c77350616c467ec581.pdf
dx.doi.org/10.21608/jesaun.2006.110566
GA AND DERIVATIVE DERIVED GENERALIZED PREDICTIVE CONTROL IN REDUCING BULLWHIP EFFECT
H.
W. Gomma, MIEEE
Electronics, Communication and Computer Engineering, Department, Helwan University, Egypt
author
text
article
2006
eng
In supply chains, the phenomenon of bullwhip effect (the variance amplification of order quantities observed in supply chain) has received a considerable attention by companies as it leads to tremendous losses and poor customer services. This variance amplification occurs according to the necessity of using forecasting methods by companies to predict the demand. To overcome this problem the business society resorts to develop what is called decision rules which show that the bullwhip effect is not avoidable. This paper introduces a control engineering approach called Derivative Derived Generalized Predictive Control (DDGPC) together with Genetic Algorithm GA to reduce this effect. The proposed method can reduce bullwhip effect. Moreover, stability and robustness analyses of the proposed technique are investigated. This would help decision-makers in supply chains management to reduce the negative consequences of the bullwhip effect.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
859
874
https://jesaun.journals.ekb.eg/article_110567_c0c5d1d3b8f9ec27e955f9ac5c420e76.pdf
dx.doi.org/10.21608/jesaun.2006.110567
INTELLIGENT CONTROL OF MAGNETIC SUSPENSION SYSTEMS
Gamal
Abd-El-Raheem
Electrical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt.
author
Abd-El-fattah
Mahmoud
Electrical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt.
author
Amer
Abd-El-fattah
Electrical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt.
author
Hosam
Ismail Hasan
Petroleum Pipelines Company, Egypt.
author
text
article
2006
eng
This paper proposes the application of fuzzy and neuro-fuzzy techniques to the control of an open loop unstable magnetic suspension system using genetic algorithms (GA's) as a tuning algorithm. A Mamdani type fuzzy PID controller is investigated. The proposed controller employs a twostage control structure, where the fuzzy PI controller reasonably aims to suppressing steady state errors and the fuzzy PD controller provides stabilizing action. The membership functions' parameters for both controllers are determined by the GA's. A Takagi-Sugeno-Kang (TSK) controller using parallel distributed compensation (PDC) approach is presented. The proposed controller, which is nonlinear, is fuzzy blending of individual piecewise linear controllers designed using pole placement technique. A neuro-fuzzy controller is proposed. Reinforcement learning along with GA's was used to train the neuro-fuzzy controller.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
875
901
https://jesaun.journals.ekb.eg/article_110570_d8c73b0204ca6aa964306b4503ff1778.pdf
dx.doi.org/10.21608/jesaun.2006.110570
INVESTIGATING THE REVERSE LINK ERLANG TRAFFIC CAPACITY OF A POWER CONTROLLED WIRELESS LOCAL LOOP CDMA SYSTEM
Nawal
El-Fishawy
Faculty of Electronic Engineering, Department of Electronics and
Electrical Communications, Menouf, Egypt
author
Essam
Sourour
Faculty of Engineering, Department of Electrical Communications,
Alexandria, Egypt
author
Ahmed
Salah
Telecom Egypt, Cairo, Egypt
author
text
article
2006
eng
In this paper, the reverse link Erlang traffic capacity of a power controlled CDMA based Wireless Local Loop (WLL) voice system equipped with high gain directional antennas at either the base station or users’ houses is investigated. It is shown that the Erlang traffic capacity of CDMA based WLL system is several times that of mobile cellular CDMA system and conventional multiple access systems, such as FDMA and TDMA based systems. Finally the study of Telecom Egypt WLL CDMA2000-1xRTT network is examined as a case study
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
903
922
https://jesaun.journals.ekb.eg/article_110583_9c9483d43302b13bc3c662042379e3d2.pdf
dx.doi.org/10.21608/jesaun.2006.110583
TRANSIENT STABILITY ENHANCEMENT USING ARTIFICAL INTELLIGENCE BASED GOVERNOR CONTROLLER
M. Z.
El-Sadek
Electrical Engineering Department, Faculty of Engineering,
Assiut , Egypt
author
Gaber
Shabib
Electrical Engineering Department, High Institute of Energy, Aswan, Egypt
author
Wael
M. Soliman
High Dam Hydropower Plant, Hydro Power Generation Company, Aswan, Egypt
author
text
article
2006
eng
The paper investigates the application of a fuzzy logic – based governor controller as a technique of artificial intelligence techniques for stability enhancement of a multimachine power system. A fuzzy controller is designed to operate in real time to improve each generating unit transients in a multimachine system through the governor loop. The fuzzy controller requires two inputs signals, speed deviation and acceleration of the machine and generates one output as a supplementary signal into the governor loop when the excitation system is fixed. The developed fuzzy controller, whose control signals are adjusted using on line measurements, offers better damping effects for generator oscillations under large disturbances compared to turbine speed governor with conventional controller. Computer simulations of a 3 unit power system show that employing this type of control is effective in reducing excessive over and under frequency deviations.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
923
936
https://jesaun.journals.ekb.eg/article_110593_121948a5b253243a619d661a32bb6000.pdf
dx.doi.org/10.21608/jesaun.2006.110593
DESIGN OF DIFFERENT COMPENSATORS FOR DOUBLE INTEGRATOR PLANTS
Awad
I. Saleh
Department of Electrical Engneering, Faculty of Engneering, Assiut University, Assiut, Egypt.
author
Mohamed
M. M. Hasan
Department of Electrical Engneering, Faculty of Engneering, Assiut University, Assiut, Egypt.
author
Amer
A. Ali
Department of Electrical Engneering, Faculty of Engneering, Assiut University, Assiut, Egypt.
author
Mostafa
A. Ahmed
Department of Electrical Engneering, Faculty of Engneering, Assiut University, Assiut, Egypt.
author
text
article
2006
eng
This paper describes the design and implementation of various type of controllers, used in controlling the double integrator system with input saturation none linearity. Two different types of controllers for the double integrator system will be discussed, conventional or classical controllers and intelligent controllers. The double integrator plant, which is one of the most fundamental systems in control applications, is considered here. Some of applications of the double integrator plant are, satellite control system [1], [2], single-degree-of-freedom translational [4], single-axis spacecraft rotation, alpha joint of Space station, inverted pendulum system with an on-off actuator, and, conventional hard disk drive with a single voice-coil-motor (VCM) actuator. First, the design of different conventional controllers for the double integrator plant with saturation nonlinearity will be presented. Then, the design and implementation of two types of Fuzzy Logic Controller (FLC) will be presented. Finally, PID controller for the Double Integrator system that is tuned using genetic algorithms will be presented. It was found that PID controller for the double integrator system that is tuned using genetic algorithms is better than the other controller.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
937
958
https://jesaun.journals.ekb.eg/article_110597_a6a6d656d5d9a81db9f61ab9de5c766b.pdf
dx.doi.org/10.21608/jesaun.2006.110597
INTEGRATING THE VALUE OF ECO-BUILDING WITHIN THE DESIGN PROCESS: AN INTRODUCTION TO ASSESSING CRITERIA IN EGYPT
Hatem Galal
Abd Elazim Ibrahim
Department of Architecture, Faculty of Engineering, Mataria, Helwan University
Postal Code: 11718 MASAKEN ELHELMIA, Cairo-Egypt
author
text
article
2006
eng
High performance eco-building offer superior performance in a variety of areas, including functionality, energy and water efficiency, quality of the indoor environment (air quality, thermal comfort, lighting…etc.), waste management and other many areas without necessarily increasing in capital costs. Establishing challenging building performance objectives should be at very early in the design process, usually by referencing a recognized rating system. This rating system has been done and identified in Europe, United States of America and many other countries. This piece of work introduces the idea of constructing an eco-building assessing tool for Egypt by introducing a definition of ecobuilding issue and its components. It discusses the barriers that prevent qualifying the eco-building scheme. This paper illustrates two famous schemes that used in assessment the eco-scheme in buildings, the first one used in the United States of America called LEED and the second one used in New Zealand and Australia called BRANZ. The strategy of development and delivery of the Egyptian eco-assessing tools to be concluded. These tools are depending on the basic criteria of qualifying the eco-building. The quantity of the used data is depending on the awareness of the developers, decision makers, and the construction organizations and their understanding to the value of qualifying the eco-building in projects. According to this, more data can be used in the assessing tools which lead to a positive effect on the performance of the building
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
959
970
https://jesaun.journals.ekb.eg/article_110614_5e76c04f141df55d28335b11b737528a.pdf
dx.doi.org/10.21608/jesaun.2006.110614
REDEVELOPMENT SITE OF ABDALI : WILL IT IMPROVE THE QUALITY OF LIFE AT AMMAN, JORDAN?
Samer
Abu-Ghazalah
B. Arch., M. Phil. (UK), Ph.D. (UK), Hon. Dip.
Arch. (U.K)
Associate Professor, Department of Architecture University of Jordan
Address P.O. Box 926966 AMMAN 11190 JORDAN
Fax No. ++962 6 5676213
author
text
article
2006
eng
Although the interest in “quality of life” studies appeared at the middle of the 20th century (around 1950) as part of the economic, social, and environmental studies, developing Middle Eastern countries did not start to examine it in detail until the beginning of the 21st century. The need to measure the quality of life of a city or a district is considered a vital part of the growth and urbanization process that is happening at an incredible rate without the ability to control or analyze it. Quality of life means measurement of people’s satisfaction and the quality of the environment in which they live. Jordan recently started an economic reform process that involves improving the climate for foreign investment to improve the economy. The redevelopment site of Abdali, near the city center, is one example of foreign investment projects that will be examined in this paper. The site was originally being used for administrative buildings for the army. The site area is around 350,000 square meters, with a developed area of over one million square meters. The project will cost over US$ one billion. The infrastructure for this project is nearly completed and the construction will start at the beginning of the year 2006 and will take several years. In this study a measure of expected future quality of life after the redevelopment project takes place will be examined, and a number of conclusions have been reached at end.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
34
v.
No 3
no.
2006
1009
1025
https://jesaun.journals.ekb.eg/article_110615_c23f2e0b9f7f2a4d566e0928d61814b6.pdf
dx.doi.org/10.21608/jesaun.2006.110615