ORIGINAL_ARTICLE
MODELING OF REINFORCED CONCRETE BEAMS WITH AND WITHOUT OPENING BY USING ANSYS
This paper presents the procedures of constructing an ANSYS nonlinear finite element model for reinforced concrete beam analysis. This model was used to analyze reinforced concrete beams with and without openings. The results were compared with the experimental results of fullscale laboratory tests made experimentally. Beams strength, stiffness, deformed shape, and cracking patterns were investigated. The comparison between experimental and analytical results showed acceptable agreement.
https://jesaun.journals.ekb.eg/article_127752_35725246128eb93f30f392ec46d0cc6b.pdf
2009-07-01
845
858
10.21608/jesaun.2009.127752
Reinforced concrete
Beams
web openings
shear
Finite Elements
ANSYS
OSMAN
M. RAMADAN
1
Professor, Faculty of Engineering, Cairo University
AUTHOR
SAYED
M. ABDELBAK
2
Professor, National Housing and Building Research Center
AUTHOR
AHMED
M. SALEH
3
Associate Professor, Faculty of Engineering, Cairo University
AUTHOR
ABDULKAREEM
Y. ALKHATTABI
4
Graduate Student, Cairo University
AUTHOR
ORIGINAL_ARTICLE
IMPACT OF SEISMIC PROVISIONS IN DIFFERENT EDITIONS OF THE EGYPTIAN CODE OF LOADS
The last edition of the Egyptian Code of Loads (ECOL) was released by the end of year 2008. The seismic provisions in this edition are almost completely different compared with those in the 1993 edition while some specific changes are presented relative to the 2003 edition. The major significant changes in the seismic provisions revealed in the different editions are reviewed. The impact of these provisions on the level of seismic protection for different types of structures with different heights is analyzed and discussed. An analytical analysis is carried out to compare and verify the applicability of these methods and the protection level they introduce. The modal response spectrum (MRS) analysis is carried out using the elastic design spectrum specified by the 2008 ECOL while the time history analysis (THA) is applied using seven different real earthquake excitations selected to match the specified elastic spectrum and soil type. Suggestion to rationally enhance the seismic protection level obtained from the multiple response spectrum is presented and emphasized. This study extends to analyze and compare our seismic provisions with those appeared in different international codes for sites with similar conditions. It is found that the provisions in the 1993 edition yield base shear much less than the values obtained using 2008 edition especially for low to medium height buildings located in medium and high seismic zones. Also, it is found that some provisions in the new edition need to be urgently reconsidered.
https://jesaun.journals.ekb.eg/article_127757_161b778459bc1cd2359be116932b2d5f.pdf
2009-07-01
859
884
10.21608/jesaun.2009.127757
seismic codes
ECOL
seismic analysis methods
response modification factor
seismic provisions
Waleed
Abo El-Wafa Mohamed
1
Lecturer, Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt.
AUTHOR
ORIGINAL_ARTICLE
A MULTI-WIDEBAND STACKED PATCH ANTENNA WITH PARASITIC RESONATORS AND SWITCHED SLOTS
A compact stacked microstrip patch antenna is proposed based on slot matching concept. Double layers of patches with parasitic resonator elements and substrates are manipulated in a stacked configuration. Slots and switches are integrated to each patch to enhance the antenna applicability for multi-wideband applications. The dimensions of the patches, parasitic elements, slots, and states of the switches and their positions are designed such that the antenna gives different number of resonant frequencies. The proposed antenna is capable to achieve a return loss less than -9.54 dB and voltage standing wave ratio 2 in almost nine frequency bands within a frequency range of 2 - 5 GHz.
https://jesaun.journals.ekb.eg/article_127761_bb02633e9daac93743f30dd49262a7fb.pdf
2009-07-01
943
954
10.21608/jesaun.2009.127761
Elsayed
Esam M. Khaled
esamk54_2000@hotmail.com
1
Elec. Eng. Dept., Assiut University, Assiut, Egypt
AUTHOR
Ayman
A. R. Saad
dem_as@yahoo.com
2
Kosseir Radio, Telecom Egypt, kosseir, Egypt
AUTHOR
ORIGINAL_ARTICLE
PID CONTROLLER TUNING SCHEME FOR TWIN ROTOR MULTI-INPUT MULTI-OUTPUT SYSTEM BASED PARTICLE SWARM OPTIMIZATION APPROACH
This paper presents a new intelligent control scheme which utilizes particle swarm optimization (PSO) for off-line tuning of proportionalintegral-derivative (PID) controller for the twin rotor multi-input multioutput system (TRMS). The control objective is to make the beam of the TRMS move quickly and accurately to the desired attitudes. The TRMS exhibits MIMO characteristics, high order non-linearity, significant cross coupling and inaccessibility of some of its states and outputs for measurements. PSO Algorithm is successfully implemented to this problem. Experimental and simulated results of the developed PID controller for a twin rotor system are given to demonstrate its effectiveness. Satisfactory results are anticipated in the experimental as well as in the simulation results. In an attempt to evaluate the performance of the developed controller an experimental and simulated comparative assessments with the conventionally PID tuned method (Ziegler–Nichols method) has been conducted. The results of the PID controller based PSO reveals better performances indices than the other conventional controller.
https://jesaun.journals.ekb.eg/article_127764_26af5d2ade69e46907c4578740bc5c1f.pdf
2009-07-01
955
967
10.21608/jesaun.2009.127764
Evolutionary Computing
Particle swarm algorithm
PID controller
TRMS
El-Sayed
M. Ahmed
1
Computers and Systems engineering Department Minia University
AUTHOR
M. Abd-Elhady
Mohamed
2
Computers and Systems engineering Department Minia University
AUTHOR
ORIGINAL_ARTICLE
A GENERALIZED PETRI NET-BASED DIAGNOSER FOR FAULT DETECTION AND ISOLATION IN COMPLEX PROCESSES
Recently, an efficient method for obtaining reduced interpreted Petri net, IPN, diagnoser was previously proposed for discrete event systems. This diagnoser consists of a single place and the same number of transitions that the system model has. Although, the current marking of this place (diagnoser) is enough to determine and locate faults occurring in a simple diagnosable discrete event system, it fails to determine and locate faults occurring in a complex non-diagnosable hydride systems that have discrete and continuous variables. Diagnosability means that the PN model is live, strongly-connected, and Transition-invariant (T-invariant); however, most of PN models are not diagnosable. This paper generalizes the IPN-based diagnoser to deals with such complex systems with ease. Chemical batch processes are employed to test the modified IPN-based diagnoser and the simulation results obtained indicate that the proposed diagnoser is promising for industrial processes.
https://jesaun.journals.ekb.eg/article_127767_8646e9528b16ac872482618a134563ab.pdf
2009-07-01
969
981
10.21608/jesaun.2009.127767
Discrete event systems
Hybrid systems
Fault detection and isolation
Petri Nets
Interpreted Petri Nets
Chemical batch processes
Dr. Hamdi
A. Awad
awadhaa@yahoo.co.uk
1
Department of Industrial Electronics and Control Engineering, Faculty of Electronic Engineering, Menouf, 32952, Menoufia University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
OPERATION OF BASED IMPEDANCE PROTECTION NUMERICAL RELAY WITH STATCOM FACTS DEVICES
This paper presents a study of the impacts of the Flexible AC Transmission Systems (FACTS) devices on the transmission line impedance measured by numerical impedance protection relay when applied to protect a shunt compensated transmission line. Most of the FACTS devices are installed on existing transmission lines to enhance their capacity and performance. The Static Synchronous Compensator (STATCOM) is a shunt device of the FACTS family using power electronics to control power flow and improve transient stability on power grids. This paper investigates the effect of STATCOM operation conditions during voltage fluctuations and faults on the impedance measured by numerical impedance relay. Matlab with SimPowerSystems toolbox is used to model and simulate a 500 KV, 300 Km shunt compensated transmission line. The effects of different fault types and different voltage fluctuation cases on the numerical impedance relay are investigated of compensated and uncompensated transmission line
https://jesaun.journals.ekb.eg/article_127768_0513cfbbc516df664bfae0bd1d657d6e.pdf
2009-07-01
983
997
10.21608/jesaun.2009.127768
FACTS
STATCOM
Voltage fluctuation
Impedance relay
Omar
Noureldeen
omar_noureldeen@yahoo.com
1
Faculty of Engineering, South Valley University, Qena, Egypt
AUTHOR
ORIGINAL_ARTICLE
ABSORPTION AND AXIAL RATIO EFFECTS ON THE SCATTERING INTENSITIES OF A SPHEROIDAL PARTICLE ILLUMINATED WITH A PLANE WAVE OR OFF-AXIS GAUSSIAN BEAM
Angular scattering and internal intensities distributions in a lossy dielectric spheroidal particle illuminated with a plane wave or a focused Gaussian beam are investigated. The intensities are calculated using the technique that combining the plane wave spectrum method and the Tmatrix method. The intensities are calculated as a function of the axial ratio for different spheroid's shape and absorptions. The effects of the incident beam position at or near resonance are also investigated. The angular scattering is much affected by the absorption when the beam is shifted to or outside the edge of the particle. The resonant modes in a lossy oblate particle are much affected by the absorption than those of a lossy prolate particle. The resonant modes having high-Q are sensitive to the axial ratio and absorption changes than the low-Q modes either in a prolate or oblate particle.
https://jesaun.journals.ekb.eg/article_127770_bbeb7772fb07c7052e05e1ec511e8c7e.pdf
2009-07-01
999
1008
10.21608/jesaun.2009.127770
Elsayed
Esam M. Khaled
esamk54_2000@hotmail.com
1
Elec. Eng. Dept., Assiut University, Assiut, Egypt
AUTHOR
Hany
L. Ibrahim
hany_louka@yahoo.com
2
Telecom Egypt, Qina
AUTHOR
ORIGINAL_ARTICLE
SCATTERED AND INTERNAL FIELD INTENSITIES OF A HOMOGENEOUS DIELECTRIC SPHEROIDAL OBJECT ILLUMINATED WITH AN ARBITRARY FOCUSED OFF-AXIS ELECTROMAGNETIC BEAM
A technique combining the plane wave spectrum method and the T-matrix method is used to calculate the internal and scattered electric field intensities of a homogeneous dielectric spheroidal object illuminated with a polarized shaped beam. This technique is modified and used here for spheroidal objects of size parameter and elongation larger than those previously demonstrated in the literature. The beam is modeled using an angular spectrum of plane waves. The beam is physically realizable, satisfies Maxwell's equations and arbitrarily focused. Also the beam can be shifted far a away from the surface of the object. Scattered and internal intensities are calculated using the T-matrix method. The behavior of the internal and scattered field intensities of different spheroidal objects shows that a near resonant mode(s) can be excited in a spheroid illuminated with a focused and shifted beam that propagates in a direction perpendicular to the elongation direction of the spheroid. The axial ratio (ratio of the radii of the spheroid) is a more critical parameter for the internal and scattered field distributions in the case of an oblate spheroid as compared with a prolate case. This technique can be used to calculate the internal and scattered fields of an inhomogeneous layered spheroid illuminated with an arbitrary shaped electromagnetic beam
https://jesaun.journals.ekb.eg/article_127772_57133613f8caa0997f09c989145fe239.pdf
2009-07-01
1009
1021
10.21608/jesaun.2009.127772
Elsayed
Esam M. Khaled
esamk54_2000@hotmail.com
1
Elec. Eng. Dept., Assiut University, Assiut, Egypt
AUTHOR
Hany
L. Ibrahim
hany_louka@yahoo.com
2
Telecom Egypt, Qina
AUTHOR
ORIGINAL_ARTICLE
Proposed Model for Optimization of Constrained Multipass Turning Opertaion
There have been a number of ways of subdivision of total depth of cut during cost optimization in constrained multipass turning operation. The total production cost minimization is achieved by summation of the minimum costs of individual rough passes and finish pass based on the maximum possible selection of depth of cut for finish pass and distributing the balance of depth of cut among passes such as to achieve minimum range variation among all. The resulting subdivision of depth of cut yields lower or equal costs when compared to those determined by using traditional and nontraditional approaches suggested by other researchers.
https://jesaun.journals.ekb.eg/article_127774_f23e7168f143e6498daf20226be23106.pdf
2009-07-01
885
897
10.21608/jesaun.2009.127774
rough turning
finish turning
Depth of cut
Optimization
Omar
M. Elmabrouk
ommabrouk@yahoo.com
1
Department of Industrial Engineering and Manufacturing Systems, Faculty of Engineering, University of Garyounis, Libya
AUTHOR
Osama
M. Erfan
osamabanyswef@yahoo.com
2
Department of Industrial Engineering and Manufacturing Systems, Faculty of Engineering, University of Garyounis, Libya
AUTHOR
Saleh
M. Amaitik
3
On leave from University of Banyswef, Egypt
AUTHOR
ORIGINAL_ARTICLE
GAP FLOW BEHIND TWO PLATES HAVING ASYMMETRIC BEVELED TRAILING EDGE
The effect of both gap size and Reynolds number variation on the flow between two plates having asymmetric beveled trailing edge placed sideby-side in a uniform stream have been investigated both numerically and experimentally. Two plates with gap ratios of 0.5, 1.0 and 1.5 and beveled trailing edge of angle 20 o have been tested. The effect of Reynolds number variation on the gap flow was examined for gap ratio s/t 1.0 . The tested Reynolds number range was from 4 2.1810 to 4 3.6810 . The results displayed that the gap size has a pronounced effect on the gap flow for gap ratios less than 1.5, where the wake behind the two plates shows an asymmetric development for gap ratios 0.5 and 1.0 and a symmetric development for gap ratio equal to 1.5. The results showed also that Reynolds number has a weak effect on the gap flow characteristics within the tested range of Reynolds number
https://jesaun.journals.ekb.eg/article_127775_28ab010a2272feeffee33bd452be15b2.pdf
2009-07-01
899
908
10.21608/jesaun.2009.127775
M. M.
Mosallem
mosall2000@yahoo.com
1
Assistant Prof., Faculty of Engineering, Minia University, Egypt
AUTHOR
Zeinab
A. Ahmed
2
Ph. D., Consulting Engineer, Minia University, Minia, Egypt
AUTHOR
Abdullah
Y. Al-Hossain
3
Assistant Prof., Faculty of Science, Jazan University, Saudi Arabia
AUTHOR
ORIGINAL_ARTICLE
INTELLIGENT CONTROL OF MAGNETIC LEVITATION SYSTEM
This work investigates the design of a controller for keeping a steel ball suspended in the air. The main function of the controller is to maintain the balance between the magnetic force and the ball’s weight. A PD fuzzy controller is designed for this unstable nonlinear system to maintain the balance between the magnetic force and the ball's weight and to achieve robust stability against model uncertainties.
https://jesaun.journals.ekb.eg/article_127781_7cf69a5282d04bdf0009052ded4f58af.pdf
2009-07-01
909
924
10.21608/jesaun.2009.127781
Magnetic Levitation System
Nonlinear system
Intelligent control
Fuzzy control
Ahmed
H. Fares
1
Researcher Assistant , Mechatronics Section, Department of Mechanical Engineering
AUTHOR
Amer
abdelfattah
2
Assistant Professor , Electrical Engineering Department, Faculty of Engineering, Assiut University, Assuit (71516), Egypt
AUTHOR
Abdel Badie
Sharkawy
ab.shark@aun.edu.eg
3
Assistant Professor , Mechatronics Section, Department of Mechanical Engineering
AUTHOR
Ahmed
A. Abo-Ismail
4
Professor , Mechatronics Section, Department of Mechanical Engineering
AUTHOR
ORIGINAL_ARTICLE
CHARACTERISTICS OF OIL-LUBRICATED PARTIALLY HERRINGBONE GROOVED JOURNAL BEARING
An experimental investigation of the performance of oil-lubricated partially herringbone- grooved journal bearing (HGJBs) which have a beveled-step groove profile have been carried out. The bearing groove parameters (groove angle α, groove width ratio β , groove depth ratio Γ ) have been optimized for a wide range of bearing operating conditions in search of the best stability characteristics. Hydrodynamic lubrication unit with some accompanying apparatuses are used to measure the pressure distribution, attitude angle, Eccentricity, contact and friction torque. The optimized values are (α = 26.78º , β =0.55, Γ =2.2). The test results are compared to experimental results for the completely grooved bearing which have the same beveled-step groove profile [1] ,and rectangular groove profile . In comparison of the previous work the introduced grooved configurations showed high radial stiffness and load capacity, low friction torque and better stability characteristics.
https://jesaun.journals.ekb.eg/article_127840_97156da313b638c316d59da814e68cf6.pdf
2009-07-01
925
942
10.21608/jesaun.2009.127840
hydrodynamic lubrication
herringbone grooved
partial grooving
load carrying capacity
Pressure distribution
Stiffness
groove profile
O.
A.Abdelaal
osama_abdelaal@ymail.com
1
Post graduate student
AUTHOR
A.
A. Khalil
2
Professor, Mechanical Engineering Department, Faculty of Engineering, Assiut University, 71516 Assiut
AUTHOR
A.
M.Nasr
3
Professor, Mechanical Engineering Department, Faculty of Engineering, Assiut University, 71516 Assiut
AUTHOR
ORIGINAL_ARTICLE
THE IMPACT OF URBAN LEGISLATION ON THE SUSTAINABLE URBAN DEVELOPMENT IN EGYPT
Despite the existence of a vast number of urban legislation in Egypt; it could be a basis for achieving the goals and plans for sustainable urban development, and creating sound urban environments. However, there are many obvious negative manifestations. A closer look to the growth of Egyptian cities shows the slums, which are still prevalent in the growth of these cities. In addition to, the encroachment of urbanization on the agricultural area, as well as the meager use of space, this hinders the process of sustainable urban development. The research aims to identify the role of urban legislation - especially urban planning legislation and local government legislation - in the process of sustainable urban development in the Egyptian cities. Also, the research aims to discover the deficiencies that led to decrease the legislation effectiveness, and show their direct impacts on sustainable urban development. The research implies five main parts. The first part deals with the introduction, in terms of, the problem, the objectives and methodology of the research. The second part discusses the sustainable urban development in Egypt. The third part emphasizes on the role of urban legislation in sustainable urban development process in Egypt. The fourth part deals with the urban planning legislation in terms of their deficiencies and the most important negative impacts on sustainable urban development. The fifth part discusses the local government legislation in terms of their deficiencies and the most important negative impacts on sustainable urban development.
https://jesaun.journals.ekb.eg/article_127843_3cf252cd769a6fc177d424ef537377e0.pdf
2009-07-01
1023
1040
10.21608/jesaun.2009.127843
Esam Aldin
Mohamed Ali
1
Associate Professor, Department of Urban Planning, College of Architecture & Planning, King Saud University, Riyadh, Kingdom of Saudi Arabia
AUTHOR