Abstract:

For overactuated systems, due to the redundancy of the actuators, there is often serious coupling between the actuator faults, which may bring great difficulty to fault detection, especially for fault isolation. To overcome the drawbacks, a fault diagnosis method for overactuated systems is proposed with unknown input filters. Firstly, a new unknown input filter is proposed with a novel structure, which is more convenient to implement. And then, by considering an actuator fault as the unknown input vector, a set of structure residuals is achieved to fault isolate. Next, a fault estimation method is presented based on the isolation result. Finally, the presented method is applied to the ADMIRE aircraft control system, and simulation results illustrate the method is able to detect and estimate the actuator multiplicative fault effectively.