基于未知输入滤波器的过驱动系统故障诊断方法

Unknown input filter based fault diagnosis method for over-actuated systems

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。

For over-actuated systems, due to the redundancy of the actuators, there is often serious cou- pling between the actuator faults, which may bring great difficulty to fault detection, especially for fault isola- tion. 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 residu- als is achieved to fault isolate. Next, a fault estimation method is presented based on the isolation result. Final- ly, 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.