Switched control for local stabilization of discrete-time uncertain takagi-sugeno fuzzy systems with relaxed estimate of the domain of attraction

This paper addresses the local stabilization problem and the computation of invariant subsets of the domain of attraction for uncertain nonlinear discrete-time systems. The proposed procedures use Takagi-Sugeno (T-S) fuzzy models that have uncertain membership functions and known local linear models. Based on a non-quadratic Lyapunov function, the proposed method uses a switched control law and the design conditions are given in terms of a optimization problem subject to Linear Matrix Inequalities (LMIs) constraints. The procedure provides a new and effective way to enlarge the estimation of the domain of attraction (DOA). Finally, a numerical example illustrates the effectiveness of the proposed method and compares it with procedures found in the literature.

Keywords

Discrete-time uncertain nonlinear system, Domain of attraction (DOA), Linear matrix inequality (LMI), Switched control, Takagi-Sugeno (T-S) fuzzy model, Uncertain membership functions