Filtreler

Estimates of simplified equivalent circuit parameters of a typical wound toroidal core using genetic algorithms

Tutkun N. | Moses A.J.

Toroids wound from grain-oriented 3% Si-Fe have been widely used for building various types of electromagnetic devices. Although magnetic properties of a typical toroidal core are provided in data sheets, its approximate equivalent parameters are not frequently given. When such devices are used in manufacturing process, their simplified equivalent circuit parameters are required without interruption of production line in case of a system failure. This investigation makes an attempt to estimate these parameters using a simple genetic algorithm method. The obtained results are slightly different ...Daha fazlası

A new modulation approach to decrease total harmonic distortion of the spwm voltage waveform using genetic optimization technique

Tutkun N.

The pulse width modulated power inverters have been increasingly using to convert DC power to AC power in small wind plants. When these inverters are used for power conversion, the integrated output voltage waveform is inevitably distorted. Although increasing the switching frequency is one choice to achieve the smoother output voltage, it adds extra harmonics to the output. There are various techniques such as analogue filtering, harmonic elimination etc. to reduce the number of harmonics usually affecting the system performance. In this study, a simple but efficient modulation approach based ...Daha fazlası

Genetic estimation of iron losses in strip wound toroidal cores under PWM flux conditions

Tutkun N.

Recently estimation of iron losses in electrical steels have become very significant for the manufacture of well-designed magnetic devices that are to be subjected to electronically generated voltage excitations such as pulse width-modulated (PWM) voltage excitation. In this study, iron loss components were estimated by means of the genetic algorithms method and electrical steel manufacturers' data. The results were compared with those obtained by a widely used classical method. The comparison has shown that the genetic algorithms method improved loss estimation with respect to the classical m ...Daha fazlası

Improving genetic algorithms' performance by local search for continuous function optimization

Hamzaçebi C.

The genetic algorithms (GAs) can be used as a global optimization tool for continuous and discrete functions problems. However, a simple GA may suffer from slow convergence, and instability of results. GAs' problem solution power can be increased by local searching. In this study a new local random search algorithm based on GAs is suggested in order to reach a quick and closer result to the optimum solution. © 2007 Elsevier Inc. All rights reserved.

Improved power quality in a single-phase PWM inverter voltage with bipolar notches through the hybrid genetic algorithms

Tutkun N.

Inverters are such electronic devices that are extensively used to convert DC power to AC power in wide-range domestic and industrial applications. DC power is usually supplied from either national grid through the rectifiers or batteries for high and low energy demands, respectively. When they are employed to feed electrical devices the efficiency of these devices tends to decrease due to harmonic occurrence in them. One solution to this problem is the selective harmonic elimination which is required to solve multiple non-linear equations simultaneously. These equations are mainly function of ...Daha fazlası

Optimization of multimodal continuous functions using a new crossover for the real-coded genetic algorithms

Tutkun N.

In this study, a new crossover approach to the real-coded genetic algorithm is proposed. The approach is simply based on efficiently tuned real-coded crossover operation using the probability distribution function of Gauss distribution to generate rather dissimilar strings which may be candidates of possible solutions. Also linear and quadratic mapping algorithms comparatively used both to constrain individuals in the given search spaces and to produce different individuals in order to increase average fitness relatively for the same population. Moreover, to refine genetically found optimum po ...Daha fazlası

Estimation of the beach bar parameters using the genetic algorithms

Kömürcü M.I. | Tutkun N. | Özölçer I.H. | Akpinar A.

Waves, topographic characteristics and material properties are the most significant factors, which affect the sediment movement and coastal profiles. In this study, considering the wave height (H0) and period (T), the bed slope (m) and the sediment diameter (d50), the cross-shore sediment movement is investigated using a physical model and obtained 80 experimental data for offshore bar geometric parameters. The experimental results are also evaluated by the genetic algorithms (GAs) that are limitedly employed in coastal engineering applications. The results of GAs model and equations cited in ...Daha fazlası

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