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25,002 Article Results

Impact Analysis of Dwell Angles on Current Shape and Torque in Switched Reluctance Motors

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4894
Syeda Fatima Ghousia
The reduction of torque ripple is the main target in research for designing a variable drive system with switched reluctance motors (SRM) for higher torque density and better efficiency. This ripple is due to the transition of excitation current between the adjacent phases. Precise control of turn-on and turn off angle is required to smooth the torque. In this paper, the effects of selecting the turn-on and turn-off angles are simulated in detail. It is observed that with the extended turn-on and turn off angles, the precise selection of turn-on and turn off angle can alter the shape of the excitation current in the stator coil and its point of overlapping with the adjacent coil. Therefore the transition between different phases can be smoothed out. The impact of this alteration on the excitation current and torque ripple as a function of different parameters of dwell angle is studied in detail in this paper. It is found that a sinusoidal current shape can also be obtained with the proper selection of these parameters.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.236
Volume: 2
Issue: 2
Page: 160-169
Publish at: 2012-03-14

Influence of Harmonics in Laboratory due to Nonlinear Loads

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4899
Risnidar Chan , Ismail Daut , Syafruddin Hasan , Norhaidar Hasim
This research was focused on the customer’s side of the meter which is the effect of harmonics on a laboratory in Electrical System Engineering School at K.Wai Perlis. Harmonic currents in equipments can cause them to experience overheating and increased losses, while harmonic voltage produces magnetic fields rotating at a speed corresponding to the harmonic frequency. This also results in equipments heating, mechanical vibrations and noise, reduced efficiency, reduced life, and voltage stress on insulation of equipment windings. The loads in this research are computers, Compact Fluorescent Lamps CFLs), Air Conditions and printers,which all of the loads are harmonic significant The instrument to measure and monitoring is Fluke 435 Power Quality Analyzer. With the operation of varying nonlinear loads, the injected harmonic current magnitudes and phase angles vary in a random way. This research offers the advantage of providing the utility a wealth of information on the effects of harmonics in their equipments. This will subsequently make them aware of the causes of increased cost and reduced efficiency that may be experienced by using these equipments. This paper describes the investigation cost of harmonic effect as THD, and harmonic energy losses cost.Keywords: harmonics, nonlinear loads, Energy losses cost, THD.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.142
Volume: 2
Issue: 2
Page: 219-224
Publish at: 2012-03-14

Effect of Rotor Current Control for Wound Rotor Induction Generator on the Wind Turbine Performance

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4890
Mahmoud Rabie Barakat
This paper presents the effect of rotor current control of wound rotor induction generator driven by wind turbine during different operation modes when varying the rotor resistance. The studied modes are wind speed variation, starting especially at high wind speed. Moreover, the effect of the proposed control on short circuit and critical fault clearing time is investigated.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.213
Volume: 2
Issue: 2
Page: 117-126
Publish at: 2012-03-14

Novel Optimization Technique for PI Controller Parameters of ac/dc PWM Converter using Genetic Algorithms

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4893
Vishnu Mohan Mishra , Amar Nath Tiwari , Nikhlesh Kumar Sharma
The aim of this paper is to present a novel control scheme and designing of reactance parameter of PWM convereterand,  find the optimized value of parameters for voltage PI controller for three phase ac/dc PWM converter. Using new trends Genetic algorithms- are discussed, as well.Paper describes the application of Genetic Algorithms for optimization of controller parameters of PWM converter. The behavior of the stability region is plotted with different sampling periods.Genetic Algorithms used for off-line searching Using the MATLAB, the simulation model of the dc- link PWM ac/dc converter is built up. According to the simulation results, it is known that, the presented control strategy is feasible and valid, and the converter can work well under dc motor load condition, and thus the total harmonics distortion (THD) can be reduced quickly and effectively. The PWM rectifier operates as a rectifier to supply dc power to its load a dc motor and at the same time, to improve the power factor and to compensate harmonics drawn from non-linear loads connected on the ac line.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.156 
Volume: 2
Issue: 2
Page: 151-159
Publish at: 2012-03-14

Analysis of Discontinuous Space Vector PWM Techniques for a Seven-Phase Voltage Source Inverter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4898
Mohd. Arif Khan , Atif iqbal , Sk Moin Ahmad , zakir husain
This paper presents discontinuous space vector PWM (DPWM) techniques for a seven-phase voltage source inverter (VSI). Space vector model of a seven-phase VSI shows that there exist 128 space vectors with different lengths and maps into fourteen sided polygons. A number of possibilities could arise to implement modulation of inverter legs due to large number of available space voltage vectors. Two strategies are adopted here; one utilising large and two middle sets of space vectors to implement discontinuous space vector PWM. Clamping of legs of inverter to either positive or negative dc bus leads to discontinuity in the switching and consequently offers reduced switching loss modulation strategy. A significant reduction in switching losses can be achieved while employing DPWM in a seven-phase VSI. A generalised method is also proposed to realize the DPWM in a seven-phase VSI. Comparison of continuous and discontinuous PWM is presented in terms of switching current ripple. The experimental set-up is illustrated and the experimental results are presented.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.244
Volume: 2
Issue: 2
Page: 203-218
Publish at: 2012-03-14

Implimentation of Evolutionary Particle Swarm Optimization in Distributed Generation Sizing

https://ijece.iaescore.com/index.php/IJECE/article/view/5380
J.J. Jamian , M.W. Mustafa , H. Mokhlis , M.A. Baharudin
The size of Distributed Generation (DG) is very important in order to reduce the impact of installing a DG in the distribution Network. Without proper connection and sizing of DG, it will cause the power loss to increase and also might cause the voltage in the network to operate beyond the acceptable limit. Therefore, most researchers have concentrated on the optimization technique to regulate the DG’s output to compute its optimal size. In this paper, the concept of Evolutionary Particle Swarm Optimization (EPSO) method is implemented in sizing the DG units. By substituting the concept of Evolutionary Programming (EP) in some part of Particle Swarm Optimization (PSO) algorithm process, it will make the process of convergence become faster. The algorithm has been tested in 33bus distribution system with 3 units of DG that operate in PV mode. Its performance was compared with the performance when using the traditional PSO and without using any optimization method. In terms of power loss reduction and voltage profile, the EPSO can give similar performance as PSO. Moreover, the EPSO requires less number of iteration and computing time to converge. Thus, it can be said that the EPSO is superior in term of speed, while maintaining the same performance.DOI:http://dx.doi.org/10.11591/ijece.v2i1.227
Volume: 2
Issue: 1
Page: 137-146
Publish at: 2012-03-01

Fuzzy based Power Flow control of Two Area Power System

https://ijece.iaescore.com/index.php/IJECE/article/view/5379
K Manickavasagan
This paper deals with the novel approach of fuzzy based power flow control of two area power system. Interconnected operation enables utilities to share the generation from one area to other areas. In each area, all the generators are synchronized at same frequency. The change in system load within the area causes frequency deviation in the generating buses and tie line error in the tie lines connecting neighboring areas. The control of interconnected power system is achieved by Automatic Generation Control (AGC), which maintains the balance between generation and load. In this paper, the components of AGC, frequency deviation (DF), tie line error (DPtie) and the output change in generations (DPgi) are calculated by steady state power flow analysis using decoupled Newton Raphson method. The control action is performed by conventional method using participation factor and Fuzzy Logic Controller (FLC). The DF and DPtie are the inputs to the conventional controller and Fuzzy Logic Controller (FLC). The proposed method is tested with modified IEEE 30 bus system and the results are compared. Analysis reveals that FLC is quite capable of suppressing the frequency deviation and tie line error effectively as compared to that obtained with conventional controller.DOI:http://dx.doi.org/10.11591/ijece.v2i1.219 
Volume: 2
Issue: 1
Page: 130-136
Publish at: 2012-03-01

Factors effect on the effective length in a double strap joint between steel plates and CFRP

10.11591/ijaas.v1.i1.pp11-18
Majid Mohammed Ali Kadhim
This paper presents the behavior of axially loaded flat steel plates strengthened using carbon fiber reinforced polymer sheets. Two steel plates were joined together with adhesive and followed by the application of carbon fiber sheet double strap joint with different bond lengths. The effective length of CFRP sheet has been study by using commercially available finite element analysis software ANSYS V12.1. A parametric study has been performed by numerical modeling with the variables of CFRP sheet thickness, adhesive layer thickness, steel plate thickness and number of CFRP sheet layer.
Volume: 1
Issue: 1
Page: 11-18
Publish at: 2012-03-01

Time and Cost Performance in Construction Projects in Southern and Central Regions of Peninsular Malaysia

10.11591/ijaas.v1.i1.pp45-52
Aftab Hameed Memon , Ismail Abdul Rahman , Ade Asmi Abdul Azis
Time and cost performance is the fundamental criteria for success of any project. Unfortunately construction industry in Malaysia has been regarded as industry facing poor performance leading to failure in achieving effective time and cost performance. As a consequence most of the project face huge amount of time and cost overrun. This study assessed the time and cost performance of construction projects in Malaysia using structured questionnaire survey. The findings of study revealed that 92% of construction projects were overrun and only 8% of project could achieve completion within contract duration. The amount of time overrun was in between 5-10% as agreed by respondents. In terms of cost performance only 11% of respondents mentioned that normally their projects are finished within the budgeted cost while 89% of respondents agreed that their projects were facing the problem of cost overrun with average overrun at 5-10% of contract price.  The major contributors of this poor performance include design and documentation issues, financial resource management and project management and contract administration issues. Further, qualitative study was carried out using semi-structured interviews with the experience personnel involving in managing construction project which resulted in developing 13 mitigation measure to improve time performance and 15 mitigation measure to improve cost performance in construction project. This study will help the practitioners to implement the mitigation measure at planning stage in order to achieve successful construction projects.
Volume: 1
Issue: 1
Page: 45-52
Publish at: 2012-03-01

Energy and Exergy Analyses of Egyptian Cement Kiln Plant with Complete Kiln Gas Diversion through by Pass

10.11591/ijaas.v1.i1.pp35-44
Laila M. Farag
The present article deals with evaluation of energy and exergy efficiences of an Egyptian  dry process cement kiln plant  with precalciner  characterized by that  the whole kiln gas is diverted through  by pass . Such diversion is necessary to break the intense cycles of   secondary constituents  Cl, alkalis and sulfur that may arise  between precaciner -preheater and kiln due to the high content of the raw materials of such secondary constituents. Based on average actual operation data  of the process, energy and exergy balances have been established around the  preheater-precalciner, the rotary kiln , the rotary cooler and the whole process. Energetic- and exergetic efficiency of the process attains  40%  and 25.7%  respectively . Sum of the exergy outputs attains about 49% of total exergy input and   irreversibility loss = 2354 kJ/kg clinker which represents about 51 % of total exergy input.  Energy and exergy of the by pass gases are the largest output loss items (  ~770 and 416 kJ/kg cli respectively) followed by those of the preheater exit gases (~ 622 and 152 kJ/kg cli respectively). For comparative purpose , the process was evaluated with considering no diversion of kiln gas  through by pass  . Energetic- and exergetic efficiency has been estimated in this case as  52%  and  34 %  respectively and the irreversibility attains  1840 kJ/kg clinker which represents about 52 % of total exergy input.
Volume: 1
Issue: 1
Page: 35-44
Publish at: 2012-03-01

Dynamic Scientific Method for Predicting Shelf Life of Buffalo Milk Dairy Product

10.11591/ijaas.v1.i1.pp29-34
Sumit Goyal , Gyanendra Kumar Goyal
Feedforward multilayer machine learning models were developed to predict the shelf life of burfi stored at 30oC. Experimental data of the product relating to moisture, titratable acidity, free fatty acids, tyrosine, and peroxide value were input variables, and the overall acceptability score was the output. Bayesian regularization algorithm was used for training the network. The transfer function for hidden layers was tangent sigmoid, and for the output layer it was purelinear function. The network was trained with 100 epochs, and neurons in each hidden layers varied from 3:3 to 20:20. Excellent agreement was found between the actual and predicted values establishing that feedforward multilayer machine learning models are efficient in predicting the shelf life of burfi.
Volume: 1
Issue: 1
Page: 29-34
Publish at: 2012-03-01

Finite Element Analysis of Heat and Mass Transfer Effects on Unsteady MHD Free Convection Flow past a Vertical Permeable Moving Plate with Radiation

10.11591/ijaas.v1.i1.pp19-28
Gundagani Murali
The paper examined the radiation effect on unsteady MHD free convection heat and mass transfer flow on a viscous, incompressible, electrically conducting fluid past a vertical permeable moving plate with radiation. The non-linear partial differential equations governing the flow have been solved numerically using finite element method. Graphical results for velocity, temperature and concentration profiles have been obtained, to show the effects of different parameters entering in the problem. Such flow problems are important in many processes, in which there is combined heat and mass transfer with radiation. It has been observed that the velocity increase with the increase in the radiation parameter and there is a increase in temperature with the increase in the value of radiation parameter.Keywords: Heat and Mass transfer, MHD, Radiation, FEM
Volume: 1
Issue: 1
Page: 19-28
Publish at: 2012-03-01

Design and Experiments of Low Cost Teleoperation System

https://ijra.iaescore.com/index.php/IJRA/article/view/888
Adha Imam Cahyadi , Ng Khin Hooi , Anugrah Persada , Rubiyah Yusof , Yoshio Yamamoto
In this work, a teleoperation system consists of two planar SCARA manipulators is developed. The manipulators are constructed using basic low cost aluminum bars as well as cheap electronic circuitry and software. Modeling, system identification, individual control and teleoperation control are proposed. Finally, experiments are also performed to verify the effectiveness of the design.Index Terms—Teleoperation systems, PID control, System identification, position control.DOI: http://dx.doi.org/10.11591/ijra.v1i1.272
Volume: 1
Issue: 1
Page: 1-12
Publish at: 2012-03-01

Design and Development of Vision Based Blockage Clearance Robot for Sewer Pipes

https://ijra.iaescore.com/index.php/IJRA/article/view/892
Krishna Prasad Nesaian , M. Bala Karthikeyan
Robotic technology is one of the advanced technologies, which is capable of completing tasks at situations where humans are unable to reach, see or survive. The underground sewer pipelines are the major tools for the transportation of effluent water. A lot of troubles caused by blockage in sewer pipe will lead to overflow of effluent water, sanitation problems. So robotic vehicle that is capable of traveling at underneath effluent water determining blockage using ultrasonic sensors and clearing by means of drilling mechanism is done. In addition to that wireless camera is fixed which acts as a robot vision by which we can monitor video and capture images using MATLAB tool. Thus in this project a prototype model of underground sewer pipe blockage clearance robot with drilling type will be developedDOI: http://dx.doi.org/10.11591/ijra.v1i1.192
Volume: 1
Issue: 1
Page: 64-68
Publish at: 2012-03-01

Reduced Search Space Algorithm for Simultaneous Localization and Mapping in Mobile Robots

https://ijra.iaescore.com/index.php/IJRA/article/view/891
Hesam Omranpour , Saeed Shiry
In this paper, we propose a new algorithm for simultaneous localization and mapping in mobile robots which uses evolutionary algorithm and particle swarm optimization. The proposed method is based on both local and global heuristic search methods. In each step of robot movements, the local search is applied in the small search space of odometry errors to improve the map accuracy. A global search method is applied for loop closing. The proposed algorithm detects loops and closes them, detects and solves correspondence and avoids local extremums. With a proper representation of problem parameters in chromosome, the dimensionality of search space is reduced. The proposed algorithm utilizes occupancy grid and does not require land marks which are not available in most natural environments. A new fitness function is proposed that is computationally efficient and eliminates the need for complex statistical calculations as used in current approaches. Results of experiments on real datasets exhibit the superior performance of the proposed method compared to the current methods.DOI: http://dx.doi.org/10.11591/ijra.v1i1.274
Volume: 1
Issue: 1
Page: 49-63
Publish at: 2012-03-01
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