Actuator fault-tolerant robust control of an uncertain networked control system with random time delays

In this paper, a novel robust fault-tolerant control scheme of networked flight control system against actuator faults with consideration of both norm-bounded uncertainties and time delays is proposed. Different from other research results on actuator fault-tolerant control methods, a complete fault model of actuators with partial failure is developed to represent the type and degree of actuator faults in an integrated parameterised way. Moreover, both of the time delays that are induced by avionic-bus and system uncertainties are considered to be described as mathematic parameters in complete fault model. By employing multiple parameter-dependent Lyapunov-Krasovskii functions, sufficient stability conditions of uncertain networked flight control systems with actuator faults are derived, and robust fault mode depended controllers are obtained in terms of linear matrix inequalities (LMIs), which is capable of accommodating uncertainties in the presence of actuator faults. Finally, examples are provided to illustrate the effectiveness of the proposed method.