Fault Diagnosis Method for a Network Control System with Long-Time Delay and Data Packet Loss Based on H∞ Filtering
Fault Diagnosis Method for a Network Control System with Long-Time Delay and Data Packet Loss Based on H∞ Filtering
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DOI：
10.4028/www.scientific.net/amr.846-847.795
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发表时间：
2013-11
期刊：
影响因子：
--
通讯作者：
Jiao Meng;Qi Hua Xu;Xiao Xiao-Xiao
中科院分区：
文献类型：
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作者：
Jiao Meng;Qi Hua Xu;Xiao Xiao-Xiao
提高网络控制系统的可靠性和安全性具有重要的现实意义，因为网络控制系统是近年来的研究热点。本文针对具有大时延和数据包丢失的网络控制系统，研究了故障诊断方法。首先，针对一个具有大时延的网络控制系统，构造了状态观测器。其次，根据系统是否存在数据包丢失，将状态估计误差方程等价为具有事件关联约束的异步动态系统。通过构造基于观测器的滤波残差系统，将故障诊断问题转化为滤波问题，并给出了相应的滤波器设计算法。所设计的故障诊断滤波器系统不仅保证了闭环系统的稳定性，而且使残差系统的范数小于给定的降阶水平。仿真结果表明，该算法能有效地诊断出故障。
Improving network control system---NCS reliability and safety has important practical significance because NCS is a hot research subject in these years. Fault diagnosis methods are researched in this paper according to NCS with long-time delay and data packet loss. Firstly, given a NCS with long-time delay, a state observer is structured. Secondly, make the state estimation error equation equivalent to an asynchronous dynamical system having event incidence constraint according to whether the system having data packets loss. The problem of fault diagnosis is converted to filtering problem through structuring filtering residual system based on the observer, then giving a corresponding filter designing algorithm. The designed fault diagnosis filter system not only make sure the stability of the closed loop system but also make the residual systems norm less than given reduction level. Finally, the simulation results prove that the algorithm can diagnose faults effectively.