离散事件触发NCS的容错与容侵协同设计方法

针对执行器失效故障和网络攻击,在离散事件触发通讯机制(DETCS)下研究了NCS故障容错与攻击容侵的协同设计问题.首先,给出了DETCS下NCS故障容错与攻击容侵的架构,并以此为基础建立了集触发条件、执行器故障与网络攻击于一体的闭环NCS故障/攻击并存模型;其次,通过构造Lyapunov-Krasovskii泛函,综合应用时滞系统理论、改进的Wirtinger不等式及互反凸组合引理等,推证出了NCS可容错故障/容侵攻击的完整性充分条件,进而给出了鲁棒H_∞容错/容侵控制器与事件触发矩阵的协同设计方法,达到了容错/容侵控制与网络通讯间的协同设计目标;最后,通过仿真算例验证了所得理论结果的有效性与可行性.

Co-design method for fault-tolerant and attack-tolerance of NCS triggered by discrete event

Aimed at the problem of actuator failure and network attack, the co-design problem of fault-tolerance and attack-tolerance of NCS was studied under DETCS. Firstly, the framework of NCS with fault-tolerant and attack-tolerant ability was given out under DETCS and based on it, a closed-loop NCS model with coexistent failure and attack was established, which integrated the trigger condition, actuator failure, and network attack into one uniform framework. Secondly, by means of constructing Lyapunov-Krasovskii functional and utilizing comprehensively the time-delay system theory, improved Wirtinger’s inequality and reciprocal convex combination lemma, a completeness sufficient condition for fault-tolerant and attack-tolerant NCS was deduced, so that the co-design method of robust H_∞ fault-tolerant/attack-tolerant controller and event-triggered matrix was given out and the goal of co-design of the fault-tolerant and attack-tolerant control and the network communication was achieved. Finally, by means of simulative computational illustration, the effectiveness and feasibility of the theoretical result obtained were verified.