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Robust Stabilization of Uncertain Fuzzy Systems Using Variable Structure System Approach

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1 Author(s)
Han Ho Choi ; Dept. of Electr. Eng., Dongguk Univ., Seoul

Based on the variable structure system (VSS) theory, we develop a fuzzy control system design method for a class of uncertain nonlinear multivariable systems that can be represented by a Takagi-Sugeno fuzzy model. We make the first attempt to relax the restrictive assumption that each nominal local system model shares the same input channel, which is required in the traditional VSS-based fuzzy control design methods. As the local controller we use a sliding mode controller with a switching feedback control term. In terms of linear matrix inequalities (LMIs), we derive a sufficient condition for the existence of linear sliding surfaces guaranteeing asymptotic stability of the reduced-order equivalent sliding mode dynamics. We present an LMI characterization of such sliding surfaces. We also give an LMI-based algorithm to design the switching feedback control term so that a stable sliding motion is induced in finite time. Finally, we give a numerical design example.

Published in:

Fuzzy Systems, IEEE Transactions on  (Volume:16 ,  Issue: 3 )

Date of Publication:

June 2008

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