Direct adaptive self-structuring fuzzy controller for nonaffine nonlinear system

  • Authors:
  • Jang-Hyun Park;Gwi-Tae Park;Seong-Hwan Kim;Chae-Joo Moon

  • Affiliations:
  • School of Advanced Materials and Electrical Engineering, Mokpo National University 61, Torim-ri Chonggye-myon, Muan-gun, Chonnam, Republic of Korea;School of Electrical Engineering, Korea University 1, 5-ka, Anam-dong, Seoul 136-701, Republic of Korea;School of Advanced Materials and Electrical Engineering, Mokpo National University 61, Torim-ri Chonggye-myon, Muan-gun, Chonnam, Republic of Korea;School of Advanced Materials and Electrical Engineering, Mokpo National University 61, Torim-ri Chonggye-myon, Muan-gun, Chonnam, Republic of Korea

  • Venue:
  • Fuzzy Sets and Systems
  • Year:
  • 2005

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Abstract

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.