On delay-dependent stability conditions for Takagi-Sugeno fuzzy systems

This paper presents new less conservative stability analysis conditions for Takagi-Sugeno fuzzy systems subject to interval time-varying delay. The methodology is based on the direct Lyapunov method allied with an appropriate Lyapunov-Krasovskii functional choice and the use of the integral inequalities, Finsler lemma, Newton-Leibniz formula manipulations and convex combination properties. Particularly, the main result differs from previous ones since the positiveness of the Lyapunov-Krasovskii functional is guaranteed by new relaxed conditions. Two examples illustrate the effectiveness of the proposed methodology.