基于观测器的故障诊断技术的鲁棒性

Robustness of Observer-based Fault Diagnosis Technology

基于观测器的动态系统故障诊断技术的可行性和应用性,关键是对系统不确定性因素具有良好的鲁棒性.根据基于观测器的故障诊断系统鲁棒性的特点,强调通过增加观测器自身的鲁棒性,提高线性不确定系统的故障诊断鲁棒性,并对利用未知输入观测器方法增强鲁棒性进行讨论.提出估计复合故障的一种新的复合故障估计器的设计方法,给出其存在条件以及理论证明,并提出相应的算法.

A key for the feasibility and applicability of the techniques of observer-based fault diagnosis for dynamic systems is a satisfactory robustness with respect to system uncertainties. According to the features of studying robustness of observer-based fault diagnosis systems, emphasis is put on robustness improvement of fault diagnosis in linear uncertain systems by increasing robustness of observers, and enhancement of robustness by using unknown input observers. A new design method of compound fault estimator is developed to estimate compound faults. The existence condition of a estimator is given and a related computing method is proposed.