In this paper, two different backstepping neural network (NN) control approaches are presented for a class of affine nonlinear systems in the strict-feedback form with unknown nonlinearities. By a special design scheme, the controller singularity problem is avoided perfectly in both approaches. Furthermore, the closed loop signals are guaranteed to be… (More)
Repetitive control method is well known for its high performances in feedback systems that are subject to periodic exogenous inputs. This paper reviews the theory and applications of repetitive control based on both the internal model and external model, together with some repetitive control methods for nonlinear plants.