Operator-based robust control for nonlinear feedback systems with noise disturbance

This paper is concerned with the robust stability and output tracking problems of perturbed nonlinear feedback control systems with noise disturbance using operator-based robust right coprime factorization method. After factorization by isomorphism, the robustness of the perturbed plant can be linked into the robust stability of the whole nonlinear feedback systems with noise disturbance. By designing the controllers to satisfy the proposed sufficient conditions, the robust stability of the perturbed nonlinear feedback systems can be guaranteed. Meanwhile, the plant output can asymptotically track to the reference output. The effectiveness of the proposed method is confirmed by the simulation results.