Robust adaptive control using a universal approximator for SISO nonlinear systems

Authors:
Hyeongcheol Lee;M. Tomizuka
Affiliations:
Dept. of Mech. Eng., California Univ., Berkeley, CA;-
Venue:
IEEE Transactions on Fuzzy Systems
Year:
2000

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Abstract

This paper deals with the robust adaptive control of a class of nonlinear systems in the presence of parametric uncertainties and dominant uncertain nonlinearities. The proposed controller utilizes the robust adaptive control to guarantee uniform boundedness and convergence of tracking errors. In addition, an adaptive fuzzy logic system is used as a universal approximator to reduce the model uncertainties coming from uncertain nonlinearities and to improve tracking performance. The approach does not require the matching condition imposed on control systems by using the backstepping design procedure, and provides boundedness of tracking errors under poor parameter adaptation. The method can be applied to a class of single-input single-output (SISO) nonlinear systems, transformable to a parametric-strict-feedback form