Journal
FUZZY SETS AND SYSTEMS
Volume 153, Issue 3, Pages 429-445Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fss.2005.01.003
Keywords
fuzzy system; nonaffine nonlinear system; robust adaptive control
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A direct adaptive state-feedback controller for highly nonlinear systems is proposed. This paper considers uncertain or ill-defined nonaffine nonlinear systems and employ a static fuzzy logic system (FLS) with an on-line structuring algorithm. The FLS approximates and adaptively cancels an unknown plant nonlinearity. A control law and adaptive laws for unknown fuzzy parameters and bounding constant are established so that the whole closed-loop system is stable in the sense of Lyapunov. The tracking error is guaranteed to be uniformly asymptotically stable rather than uniformly ultimately bounded with the aid of an additional robustifying control term. No a priori knowledge of an upper bound on an lumped uncertainty is required. (c) 2005 Elsevier B.V. All rights reserved.
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