分布式网络化控制系统故障诊断方法的研究

Fault diagnosis of distributed networked control system

为了避免分布式网络化控制系统由于网络负载过大而造成的时延和丢包问题,引入基于包的传输机制,并针对此特殊结构设计中心故障诊断单元.在诊断单元设计中,由于各子系统工作周期不同以及传输包的大小不同,将系统看作多速率采样系统,采用提升技术获得系统的离散模型.在此基础上设计状态观测器,实现分布式网络化控制系统的故障诊断.最后通过仿真验证了所提出方法的有效性.

In order to avoid the transmission delays and packet loss of the distributed networked control system（NCS） caused by the network overload, the packet-based transmission mechanism is introduced, and the center fault diagnosis unit is designed for this special structure, In the course of the design, the distributed NCS is regarded as multi-rate sampled-data system according to the difference of the sample periods and the packet sizes among the subsystems. The discrete model is obtained by using the lifting technique, based on which the state observer is designed to achieve the fault diagnosis of distributed NCS, Finally, simulation results show the effectiveness of the proposed method.