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A systematic method for design of multivariable fuzzy logic control systems

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1 Author(s)
Zong-Mu Yeh ; Dept. of Ind. Educ., Nat. Taiwan Univ., Taipei, Taiwan

This paper proposes a systematic method to design a multivariable fuzzy logic controller for large-scale nonlinear systems. In designing a fuzzy logic controller, the major task is to determine fuzzy rule bases, membership functions of input/output variables, and input/output scaling factors. In this work, the fuzzy rule base is generated by a rule-generated function, which is based on the negative gradient of a system performance index; the membership functions of isosceles triangle of input/output variables are fixed in the same cardinality and only the input/output scaling factors are generated from a genetic algorithm based on a fitness function. As a result, the searching space of parameters is narrowed down to a small space, the multivariable fuzzy logic controller can quickly constructed, and the fuzzy rules and the scaling factors can easily be determined. The performance of the proposed method is examined by computer simulations on a Puma 560 system and a two-inverted pendulum system

Published in:

Fuzzy Systems, IEEE Transactions on  (Volume:7 ,  Issue: 6 )

Date of Publication:

Dec 1999

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