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Observer-based Adaptive Fuzzy Control for Strict-feedback Nonlinear Systems with Prescribed Performance and Dead Zone

Wen Zeng, Zhigang Li*, Chuang Gao, and Libing Wu
International Journal of Control, Automation, and Systems, vol. 19, no. 5, pp.1962-1975, 2021

Abstract : This paper proposes an observer-based fuzzy controller for strict-feedback nonlinear systems. A fuzzy state observer is designed to estimate unmeasurable system states via a fuzzy logic system to approximate the unknown nonlinear functions of the system. A tangent prescribed performance function is utilized to gather the tracking error in a small neighborhood of the origin. The control input is designed to deal with the dead-zone property of the system. The proposed controller can guarantee that all the signals in the closed-loop system are semi-globally, uniformly, and ultimately bounded. Simulation results demonstrate the effectiveness of the proposed controller.

Keyword : Backstepping, fuzzy observer, prescribed performance, strict-feedback nonlinear system.

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