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Direct adaptive fuzzy backstepping control for uncertain discrete-time nonlinear systems using noisy measurements

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  • Toshio Yoshimura

Abstract

This paper presents a direct adaptive fuzzy backstepping control (AFBC) for multi-input multi-output uncertain discrete-time nonlinear systems. It is assumed that the systems are described by a discrete-time state equation with uncertainties to be viewed as the modelling errors and the unknown external disturbances, and the observation of the states is taken with independent measurement noises. The proposed direct AFBC is presented as follows. The proposed direct AFBC is assumed to be the fuzzy logic system by removing the explosion of complexity problem due to repeated computation of nonlinear functions at the first stage. Second, the number of the adjustable parameters is reduced by the fuzzy inference approach based on the extended single input rule modules. Third, the simplified weighted least squares estimator is constructed by reducing the computational burden of the estimation for the unmeasurable states and the adjustable parameters. The effectiveness of the proposed direct AFBC is illustrated through the simulation experiment of a simple numerical system.

Suggested Citation

  • Toshio Yoshimura, 2017. "Direct adaptive fuzzy backstepping control for uncertain discrete-time nonlinear systems using noisy measurements," International Journal of Systems Science, Taylor & Francis Journals, vol. 48(4), pages 695-704, March.
    • Handle: RePEc:taf:tsysxx:v:48:y:2017:i:4:p:695-704
    DOI: 10.1080/00207721.2016.1206990
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