基于自适应观测器的非线性系统故障诊断

An Adaptive Observer Based Fault Diagnosis for Nonlinear Systems

研究一类非线性系统执行器故障诊断问题。对于故障系统,建立一种自适应观测器,通过在线调整,故障后执行器的未知参数被在线逼近。所提出的自适应调整律能够保证观测器稳定及故障估计误差收敛。最后引入卫星反作用飞轮模型,对单飞轮发生故障的情况进行了仿真,结果表明提出的方法有效、可行。

The fault diagnosis for nonlinear systems is investigated in this paper. An adaptive observer is designed to estimate on-line the unknown parameters due to faults. By using an adaptively regulating algorithm, the observer is ensured to be stable and the estimation errors are guaranteed to converge. A reaction wheel model of the satellite is employed. Numerical simulations demonstrate that the proposed approach can detect the faults of a single reaction wheel, and estimate the faults effectively.