Design of High Performance Fuzzy Controllers Using Flexible Parameterized Membership Functions and Intelligent Genetic Algorithms

摘要

This paper proposes a method for designing high performance fuzzy controllers with a compact rule system. The method is mainly derived from flexible parameterized membership functions (FPMFs) and an intelligent genetic algorithm (IGA) which is superior to the traditional GAs in solving large parameter optimization problems. An FPMF consists of flexible trapezoidal fuzzy sets that the fuzzy set is encoded using five parameters. Furthermore, the membership functions and fuzzy rules are simultaneously determined by effectively encoding all the system parameters into chromosomes. Therefore, the optimal design of fuzzy controllers is formulated as a large parameter optimization problem, which can be effectively solved by IGA. The proposed method is demonstrated by two well-known problems, truck backing and cart centering problems. It is shown empirically that the performance of the proposed method is superior to those of existing methods in terms of the numbers of time steps and fuzzy rules.