Quadratic boundedness via dynamic output feedback for constrained nonlinear systems in Takagi-Sugeno's form

This paper studies output feedback stabilization of Takagi-Sugeno fuzzy systems with input or state constraint and bounded noise. A dynamic output feedback controller is adopted, rather than a controller based on the state observer. The notion of quadratic boundedness specified by a common Lyapunov matrix, which is novel in fuzzy control, is invoked to handle the noise. Under the proposed controller, the state of the closed-loop system is stabilizing to an ellipsoid specified by this common Lyapunov matrix. Two numerical examples are given to show the effectiveness of the controller. (C) 2009 Elsevier Ltd. All rights reserved.