状态时滞系统基于观测器的故障诊断及可诊断性  

Observer-Based Fault Diagnosis and Diagnosability for Systems with State Delays

作　　者：吕新丽[1] 李娟[1] 

机构地区：[1]青岛农业大学机电工程学院,山东青岛266109

出　　处：《青岛农业大学学报（自然科学版）》2009年第3期233-238,共6页Journal of Qingdao Agricultural University(Natural Science)

基　　金：青岛市科技计划项目(06-2-2-9-jch);青岛农业大学高层次人才启动基金项目(630815)

摘　　要：研究含有状态时滞的线性系统的故障诊断方法及故障的可诊断性问题。提出一种新颖的基于降维观测器的故障诊断方法,并给出故障可诊断性的判据。首先通过引入一种特殊的线性变换,将时滞系统转换成无时滞系统。然后将故障诊断问题转化为状态观测问题,并证明了故障可诊断性的充分条件。最后通过构造一种新的不利用残差体现故障的故障诊断器,实现了故障的实时诊断。仿真实例验证了该方法的可行性和有效性。The approach of fault diagnosis and the problem of fault diagnosability are researched for linear systems with state delays. A novel approach of fault diagnosis which based on a reduced - order observer is proposed, and a criterion of fault diagnosability is given. Firstly, a special linear transformation is introduced for systems with state delays such that the time - delay system is transformed into a delay - free one in form. Then the problem of fault diagnosis is transformed into the problem of state observation, and the sufficient condition of fault diagnosability is also proved. Finally, the fault diagnosis is real - time realized by constructing a new fault diagnoser which doesn＇ t need residual to diagnose fault. Simulation example has demonstrated the feasibility and validity of the proposed scheme.

关 键 词：时滞系统 状态时滞 故障诊断 无时滞变换 观测器 故障可诊断性 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]