Robust Fault Detection for the Networked Flight Vehicle Based on Asynchronously Switched Time-Delay Systems

A fault detection problem was investigated for the full-envelope networked flight vehicle, where the flight dynamic was modeled as a switched system with time-varying delay, and an observer-based controller and mode dependent fault detection filters were established by considering the delay's impact to the control system and fault detection system simultaneously. Then, considering the updating lag of the filter's switching signal which was introduced by the networked delay, the system model was further augmented to be an asynchronous switched time-delay system. Also, the global stability of the augmented system under asynchronous switching was guaranteed by combing the switched delay-dependent Lyapunov-Krasovskii function and the average dwell time method, and the delay-dependent existing conditions of the fault detection filters were obtained in terms of LMIs. Finally, numerical example based on the HiMAT flight vehicle was given to demonstrate the merits of the proposed method.