Asian Transactions on Engineering
Volume: 03, Issue: 02, May 2013
Title: Broken Bar Fault Detection Based on the Discrete Wavelet Transform and Artificial Neural Network
Author(s): Mustafa M. Ibrahim and Habeeb J. Nekad
Paper ID: ATE-40309027
Pages: 1 - 6
Abstract: In this paper, we present an effective method to detect broken rotor bars fault in the induction motors. This method is based on the analysis of the q-component of the stator current and discrete wavelet transform (DWT). Using the dynamic model of the squirrel-cage induction motor taking account the broken rotor bars. The RMS values of the discrete wavelet transform coefficients are fed to the artificial neural network (ANN) to identify the machine state. The broken rotor bar fault detection algorithm is implemented using matlab/simulink.
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Title: PIC 16F877A Microcontroller Based Multiple DC Motors Controller
Author(s): Suroor Moaid Dawood and Rabee' Hashim Thejeel
Paper ID: ATE-30304028
Pages: 7 - 17
Abstract: This project is mainly concerned on two DC motors speed, direction and operating period control system using three microcontrollers PIC 16F877A, one is the master and the two others are the slaves. It is a closed-loop real time control system, where rotary shaft encoder is coupled to the motor shaft to provide the feedback speed signal to the slave microcontroller. Pulse Width Modulation (PWM) technique is used to vary the voltage supplied to the DC motor armature(with fixed field voltage), thus controlling the motor speed. The PWM signal is generated by the slave microcontroller. This signal will guide the motor driver to vary the voltage supplied to motor to maintain at the required speed. The master microcontroller is programmed with the desired motor number, speed, operating period and direction of the motor from the 4 4 matrix keypad. Besides, it also lets the user monitor the performance of the system easily across the 4 20 LCD display. The serial peripheral interfacing (SPI) mode is used for the communication between the master and the two slaves. The master sends the data which include motor number , speed ,operating period and it's direction to the slaves by SPI communication technique.
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Title: γ-Radiation Shielding Properties of High Strength High Performance Concretes Prepared with Different Types of Normal and Heavy Aggregates
Author(s): Mohammed M. Al-Humaiqani, Ahmed B. Shuraim and Raja Rizwan Hussain
Paper ID: ATE-80323020
Pages: 18 - 28
Abstract: This paper presents an experimental study on the gamma ray radiation shielding properties of normal and heavy high performance concretes (HPCs). HPCs were produced with different low water-to-cementitious materials ratios (w/cm) and tested for 0.663 MeV γ-rays energy of 137Cs radioactive using NaI(Tl) scintillation detector. It was observed in this research that the compressive strength of heavy HPCs plays an important role in enhancing the attenuation of gamma rays. The compressive strength and attenuation of gamma rays in heavy weight HPCs have a near to linear relation. On the other hand, it was also found that the compressive strength of the normal concrete has almost no effect on the attenuation of gamma rays. The Linear and mass attenuation coefficients were calculated and compared with the past research and a good agreement has been found. However, the HPCs density considerably affects the attenuation of gamma rays. With the increase in the density, the attenuation coefficients increases linearly. This endorse that the relationship between the HPC density and the gamma attenuation coefficients is linear.
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Title: Analytical and Numerical Vibration Study of Unidirectional Hyper Composite Plate
Author(s): Ali Mohammed Hussein Yusif Al-Hajjar
Paper ID: ATE-60325021
Pages: 29 - 38
Abstract: An analytical and numerical study of simply supported unidirectional hyper composite plate is presented in this paper. The composite plate is composed of powder glass reinforcement in polyster resinas a matrix and long glass fibers as reinforcement.The analytical method used in this paper to find the general equation of motion is the specially orthotropic plate equations. The Navier solution is applied to solve these equations. A finite element method is used as the numerical method utilizing the ANSYS program ver. 14. The study focused on the effect of the powder and fibers volume fraction on the natural frequency of the plate. The results are so close with maximum error percentage of numerical and analytical about 2.4%, 0.38% and 9.8% for aspect ratio 2, 1 and 0.5 respectively.
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Title: Effect of Angular Velocity of Inner Cylinder on Laminar Flow through Eccentric Annular Cross Section Pipe
Author(s): Ressan Faris Hamd
Paper ID: ATE-80302020
Pages: 39 - 48
Abstract: This is study investigated the effect increasing the angular velocity on the axial velocity profile and pressure gradient for steady state, three dimensional, incompressible, isothermal, and laminar flow of a Newtonian fluid through eccentric annular duct. The results are presented for angular velocity range (0, 50, 100, 150, 200, and 250) rpm at axial Reynolds number 200 based on bulk axial velocity with radius ratio 0.5 where FLUENT software version (6.2) is used to solve continuity and momentum equations. The results of axial and tangential velocity for four sectors were found to be in good agreement with other previously published research at eccentricity are 0.2 and 0.5. The results show that the axial velocity varies with varying in rotational speed of inner cylinder and the axial pressure gradient increases with increasing in rotational speed. Also when inner cylinder is rotated, the axial velocity profile become non-axisymmetry around center of radial gap of annular pipe at eccentricity of 0.2 and 0.4.
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