不确定网络控制系统鲁棒故障诊断

针对一类具有网络时延和范数有界未知输入影响的不确定网络控制系统,提出了一种基于观测器的鲁棒H∞故障诊断滤波器的设计方法。基于Lyapunov稳定性条件和线性矩阵不等式得到了使系统渐近稳定的H∞性能判据,并基于该判据给出了系统的鲁棒H∞故障诊断滤波器的设计方法。设计的滤波器不但保证闭环系统渐近稳定,同时使滤波误差系统的H∞范数小于一个给定的衰减水平。数值算例验证了本文提出算法的有效性。

Robust fault detection for uncertain network control systems

A robust H∞ fault detection filter based on state estimate approach is proposed for uncertain network control systems with network induced delay and norm-bounded unknown input.Based on Lyapunov theory and Linear Matrix Inequality(LMI)technology,a H∞ criterion for system to be asymptotically stable is obtained.Then a robust H∞ fault detection filter is derived directly from the criterion.The fault detection filter guarantees not only the quadratic stability of the closed-loop systems but also the H∞ norm bound to be within a predefined level.A numerical case study demonstrates the feasibility of the proposed approach.