基于线性化技术的非线性系统故障诊断

Fault Diagnosis for Nonlinear Systems Based on Linearization Technique

针对非线性闭环稳定系统 ,提出了一种基于线性化技术的故障诊断方法 .首先将原系统在其工作点进行线性化处理 ,在此基础上设计系统的状态观测器 ,从而得到故障信号的初始估计结果 ;然后利用状态观测误差和故障估计误差之间的关系对估计结果进行校正 ,得到最终的故障辨识结果 .

A fault diagnosis method based on linearization technique for nonlinear closed loop stable systems is proposed. It first linearizes the original system on its working point using linearization technique and designs state observer for the linearized systems so that the initial estimates for fault signals can be obtained. Then the ultimate estimates for fault identification are obtained through the correction based on the relation between the error of state observe and that of state estimate. Simulation results demonstrate its validity.