一种含扰动项的非线性系统执行器故障估计方法  

A Method of Actuator Fault Estimation for Nonlinear SystemWith Disturbance Term

作　　者：孙延修[1] SUN Yan-xiu(Basic Course Department,Shenyang Institute of Technology,Fushun 113122,China)

机构地区：[1]沈阳工学院基础课部,辽宁抚顺113122

出　　处：《火力与指挥控制》2021年第3期38-42,共5页Fire Control & Command Control

基　　金：2019年辽宁省教育厅科学研究经费资助项目(L201906)。

摘　　要：现代控制系统的安全性与可靠性是各领域研究的热点之一,系统故障诊断与估计的方法越来越引起人们的重视。针对一类含有外部扰动的非线性系统,研究了系统执行器故障估计问题。通过设计一种增广系统观测器对原系统中的执行器故障进行估计;考虑到系统中的非线性扰动项,利用线性矩阵不等式(LMI)方法给出了观测器存在的充分条件并保证误差系统渐近稳定。同时,通过设定性能指标减少了外部扰动对执行器故障估计的影响;通过数值算例验证了执行器故障估计方法的有效性,表明该估计方法能够较好的对系统中的执行器故障进行鲁棒估计。The safety and reliability of modern control system is one of the hotspots in various fields,more and more attention has been paid to the fault diagnosis and estimation of the system.For a class of nonlinear systems with external disturbances,the problem of actuator fault estimation is studied.Firstly,an augmented system observer is designed to estimate actuator faults in the original system;Secondly,considering the nonlinear disturbance term in the system,the sufficient conditions for the existence of the observer are given by using the LMI method to ensure the asymptotic stability of the error system,at the same time,the influence of external disturbance on actuator fault estimation is reduced by setting performance index.Finally,the effectiveness of the actuator fault estimation method is verified by a numerical example,which shows that the method can estimate the actuator fault in the system robustly.

关 键 词：外部扰动 非线性系统 执行器故障 线性矩阵不等式 状态观测器 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]