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A novel polynomial membership functions based control method for T-S fuzzy systems
Wen-Bo Xie1, Jian Zhang2, Yi-Fan Li3
1School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, 200444, China; College of Automation, Harbin University of Science and Technology, Harbin, 150080, PR China.
Abstract:
To solve the state feedback stabilization problem for a class of T-S fuzzy systems, a new stability synthesis method is raised to further relax the conservatism existing in the analysis process. First, a series of nonlinear polynomials are used to approximate the system membership functions. And satisfied approximation results can be obtained. Then a polynomials transformation method is raised to change the polynomial membership functions into linear form. This method can facilitate the synthesis process and achieve better approximation precision. Therefore, by a membership function involving stability analysis approach, linear matrix inequality form stability conditions are given. Finally, by presenting and analyzing a numerical and a practical examples, the conservatism reduction effects of the proposed methods are verified.
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