Different Stability Analysis of Fuzzy System and Robust Controller Design in Flight Control System

This paper discusses the stability of continuous fuzzy control systems. Unlike the previous research works of K. Tanaka [3 7] that do a perfect stability analysis on the well known T-S fuzzy model, this paper gives an extension on the stability condition of T-S fuzzy systems with a different strategy: a new variable which is relative to the grade of fuzzy membership function, be introduced into the proving procedures, and a different stability condition educed (with a similar form). With the proposed method, it could design a better controller in a large range. In compared with the basic stability condition (in [3]), two examples of flight control system show that the designed controller has a good robustness on rejecting the parameter perturbation of plant model.