Abstract
In the case of a few input and output variables fuzzy systems have a large number of variable parameters which make the practical design and optimization of fuzzy controllers more difficult. It is necessary to reduce the number of variable parameters to simplify the design of fuzzy controllers and to make it accessible to automated design methods. In this paper, the response characteristics and the quality of fuzzy controllers were analysed by using different variable parameters. The quality of a controller is evaluated by the deformation of the characteristic field under consideration of a similarity criterion and the Fourier analysis. It is shown that the reduction in the number of variable parameters does not necessarily result in a restriction of the quality of the fuzzy controller.
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