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Adaptive fuzzy output-feedback fault-tolerant tracking control of a class of uncertain nonlinear switched systems

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  • Di Cui
  • Ben Niu
  • Huanqing Wang
  • Dong Yang

Abstract

This paper considers the output-feedback fault-tolerant tracking control problem for a class of uncertain nonlinear switched systems with nonlinear faults and strict-feedback form, where the faults which are nonaffine occur on the actuator. As a kind of specialised function approximating tool, fuzzy logic systems (FLSs), are employed to approximate the unknown smooth nonlinear functions. A switched fuzzy observer is designed to address the problem of unmeasurable states, filtered signals are used to address algebraic loop problem and the average dwell time (ADT) method is further utilised to prove the stability of the resulting closed-loop systems under a type of slowly switching signals. Based on the backstepping recursive design technique and Lyapunov function method, an adaptive fuzzy output-feedback control scheme is developed. The developed control method can ensure all the signals are semi-globally uniformly ultimately bounded (SGUUB) and the system output tracks the reference signal tightly even if unknown fault occurs. A simulation carried on an example demonstrates the validity of the obtained control scheme.

Suggested Citation

  • Di Cui & Ben Niu & Huanqing Wang & Dong Yang, 2019. "Adaptive fuzzy output-feedback fault-tolerant tracking control of a class of uncertain nonlinear switched systems," International Journal of Systems Science, Taylor & Francis Journals, vol. 50(14), pages 2673-2686, October.
    • Handle: RePEc:taf:tsysxx:v:50:y:2019:i:14:p:2673-2686
    DOI: 10.1080/00207721.2019.1672119
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