基于未知输入滤波器的过驱动系统故障诊断方法

过驱动系统由于执行器间的冗余性导致故障往往具有严重的耦合性,从而给故障的分离带来很大困难。针对过驱动系统的执行器乘性故障,提出了一种基于未知输入滤波器的故障诊断方法。首先,提出了一种新的未知输入滤波器结构,设计方便。然后,将指定执行器的故障看作未知输入,通过一组结构化残差来实现故障分离,并在此基础上,提出了一种故障估计方法。最后,通过ADMIRE飞行器的近似线性化模型仿真验证了所提方法的有效性。

Unknown input filter based fault diagnosis method for over actuated systems

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.