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Fuzzy adaptive dynamic surface control for strict-feedback nonlinear systems with unknown control gain functions

Author

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  • Jipeng Zhao
  • Xiaomei Li
  • Shaocheng Tong

Abstract

In this work, the fuzzy adaptive output feedback control is investigated for single-input single-output (SISO) uncertain nonlinear systems in strict-feedback form. The controlled systems under consideration of this work contain the immeasurable states and unknown control gain functions. The immeasurable states are estimated by constructing a fuzzy state observer, and the uncertain nonlinear functions are approximated by fuzzy logic systems. In order to settle the issue of ‘explosion of complexity’ inherent in the conventional backstepping design process, the ‘dynamic surface control’ (DSC) method is introduced. An observer-based fuzzy adaptive control algorithm is proposed by employing the adaptive backstepping control design technique and constructing the Logarithm Lyapunov functions. The designed fuzzy adaptive control scheme can settle the complexity problem of control scheme and insure that the closed-loop system is semi-globally uniformly ultimately boundedness (SGUUB), a simulation example is considered to illustrate the availability of the designed controller.

Suggested Citation

  • Jipeng Zhao & Xiaomei Li & Shaocheng Tong, 2021. "Fuzzy adaptive dynamic surface control for strict-feedback nonlinear systems with unknown control gain functions," International Journal of Systems Science, Taylor & Francis Journals, vol. 52(1), pages 141-156, January.
    • Handle: RePEc:taf:tsysxx:v:52:y:2021:i:1:p:141-156
    DOI: 10.1080/00207721.2020.1820624
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