H∞ control for uncertain nonlinear time-delay systems based on fuzzy and NN approximation via output feedback

In this paper, the problem of output feedback control is considered for a class of nonlinear systems with uncertainties, time delays and unknown states. Fuzzy T-S (Takagi-Sugeno) models are used to approximate the nonlinear systems, and RBF NNs (Radial Basis Function Neural Networks) as a compensator to eliminate the approximating error and the uncertainties. The controller is designed such that the closed-loop system satisfies the desired H∞ performance. Simulation results demonstrate the effectiveness of the developed control scheme.