Design of Single Phase Transformer Through Different Optimization Techniques
Raju Basak,
Hamed Yahoui,
Nicolas Siauve
Issue:
Volume 2, Issue 3, June 2017
Pages:
30-34
Received:
2 May 2017
Accepted:
22 May 2017
Published:
16 June 2017
Abstract: Selection of an optimization scheme for a particular problem is a complicated issue of whole research community. An Attempt is made for developing an algorithm for finding the optimal design parameters of a low cost small transformer with their own limitations. Most of the engineering optimization problems involve nonlinear objective functions that subject to many constraints. Sometimes it is very difficult to solve such problems by conventional optimization techniques and in some cases it may fail to give the global optima and could be trapped in the local minima. Comparatively the non-classical optimization schemes like Simulated Annealing (SA), Genetic Algorithm (GA), and Particle Swarm Optimization (PSO) etc. are established as a handier tool for Global Search. In this paper an attempt has been made to find an algorithm to obtain the optimal design parameters for designing a minimal cost of material for a 5KVA, 230/115 volt, single phase, core type, and dry transformer using Simulated Annealing (SA) and validating the results with another acceptable method, called Pattern Search (PA). The aim of the paper is to establish an effective and efficient method, which gives more acceptable and improved solution for Global optima, with less no. of iterations and computation time.
Abstract: Selection of an optimization scheme for a particular problem is a complicated issue of whole research community. An Attempt is made for developing an algorithm for finding the optimal design parameters of a low cost small transformer with their own limitations. Most of the engineering optimization problems involve nonlinear objective functions that...
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Estimation of Clear-Air Atmospheric Effective Earth Radius (K-Factor) in Calabar
Isaac A. Ezenugu,
Umoren Ifiok Anthony,
Okon Abasiama Colman
Issue:
Volume 2, Issue 3, June 2017
Pages:
35-37
Received:
16 October 2016
Accepted:
20 January 2017
Published:
21 July 2017
Abstract: Microwave radio propagation in terrestrial radio links over the years has earned increased application and there has been renewed attention of studies concerning techniques for estimating the probability of multipath fading distributions. Particularly, the secondary radio parameters remain very important in carrying out these estimations especially the concept of effective earth radius. This study was carried out in Calabar, South-south Nigeria with three years atmospheric parameters data obtained from Nigerian Meteorological Agency (NIMET). International Telecommunication recommendation models were used in obtaining point refractivity gradient with which the effective earth radius factor was determined. The result showed a yearly average value of 1.626091667 for the k-factor and yearly average value of -125.50845 for the point refractivity gradient. There are also monthly and seasonal variations in the two parameters. The highest k-factor of 1.8263 occurred in January whereas the least k-factor of 1.3396 occurred in November.
Abstract: Microwave radio propagation in terrestrial radio links over the years has earned increased application and there has been renewed attention of studies concerning techniques for estimating the probability of multipath fading distributions. Particularly, the secondary radio parameters remain very important in carrying out these estimations especially...
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