Abstract:

The problem of robust fault detection is investigated for networked flight control systems with unknown delays and random packet dropouts. The influences of the unknown delays and random packet dropouts are transformed to the unknown disturbance input, and a uniform mathematics model of the networked flight control systems is established. Considering the sensitivity of the residual to fault and the robustness against unknown disturbances in the same time, the fault detection problem is divided into two parts: design of the optimal reference residual model and the solution of the robust tracking. Then the solvable condition of the optimal reference residual model is obtained by using the multi objective optimization, and further the solution of the robust tracking is derived by using linear matrix inequality techniques. The numerical example show that the proposed approach can restrain effectively the impact of the delays and packet dropouts, and small faults can be detected quickly and effectively.

Key words: Networked control system, Fault detection, Flight vehicle, Delay and packet dropout