Design of Sliding Mode Controller For The Estimation Of Sensor/Actuator Fault With Unknown Input Observer For Satellite Control System.

Abstract

In this paper, the mechanism for estimation of the sensor and actuator faulty control problem for the class of nonlinear systems is investigated. The Lipschitz conditions and system uncertainties also considered. By implementing the sliding mode observer (SMO) method, initially, we introduced the transformation scheme to make the system rational. In which we split our system into two parts such that the actuator fault function has only happened in the second state vector of nonlinear dynamics. Based on the Lyapunov stability theory and appropriate inequality, some sufficient criteria in the form of linear matrix inequalities are obtained to ensure the bounded stability for the prescribed H∞ performance level. In addition, the designed algorithm for actuator fault is further applied for the sensor fault.