存在通讯限制的网络控制系统鲁棒故障检测

Robust Fault Detection of Networked Control Systems with Communication Constraints

摘要:

对一类具有随机丢包和通讯限制的网络控制系统的鲁棒故障检测问题进行研究；考虑控制器到执行器间存在通讯限制以及传感器到控制器间存在数据丢包,并将丢包用Bernoulli随机二进制分布进行描述；在此基础上建立带有故障的离散时间模型,基于所建立的模型设计故障检测滤波器,使得残差系统随机稳定,同时滤波误差系统的H∞范数满足给定的衰减水平；所设计的故障检测滤波器不但保证了残差系统对故障的灵敏,同时对系统的外部扰动输入具有鲁棒性；数值算例验证了文章所提方法是可行的。

Abstract:

This paper is concerned with fault detection filter design for networked control systems (NCSs) under consideration of random packet dropout and communication constraints. By considering communication constraints exist in the channel from controllers to actuators and random packet dropout, which is modeled as Bernoulli distribution, exists in the channel from sensors to controllers, new model for discrete-time NCSs with faults is established. Based on the established model, fault detection filter design criteria are proposed to stochastically stabilize the residual systems and preserve the H∞ norm bound to be within a guaranteed performance. The designed fault detection filters can ensure the sensitivity of the residual signal with respect to faults, and robustness of the considered systems with respect to disturbance. A numerical example is given to illustrate the effectiveness of the obtained results.