工业信息物理系统间隙DoS攻击的自适应事件触发稳定控制

Adaptive Event-Triggered Stability Control for Intermittent DoS Attacks in Industrial Cyber Physical Systems

针对具有间隙拒绝服务(DoS)攻击的工业信息物理系统(ICPS),研究一种基于观测器的自适应事件触发稳定控制方案。首先构造一个观测器估计系统状态,并采用一种新的自适应事件触发通信方案以节约网络资源;然后通过受频率和持续时间限制的间隙DoS攻击对ICPS的影响建立攻击模型,将受到DoS攻击的ICPS划分为DoS攻击活跃期系统和DoS攻击休眠期系统,并用一些过去成功触发状态重构当前受到攻击的状态,得到基于动态估计器的攻击补偿机制,保证系统在DoS攻击活跃期间的渐进稳定;最后运用分段Lyapunov泛函方法、Jensen’s不等式和Schur补引理,得到系统的稳定条件,并提出自适应事件触发参数、观测器增益和控制器增益的协同设计方案。用间歇反应器系统模拟间隙DoS攻击下基于自适应事件触发的ICPS系统稳定性能。仿真结果表明,自适应事件触发策略和基于动态估计器的补偿机制不仅能够提升系统的稳定性,还能有效降低数据传输的次数,系统在静态事件触发策略下的触发次数大约是在自适应事件触发策略下的4.5倍。

For industrial information physical systems(ICPS)with gap denial of service(DoS)attacks,an observerbased adaptive event-triggered stability control scheme was proposed.Firstly,an observer was constructed to estimate the unmeasured state of the system,and a new adaptive event-triggered communication scheme was adopted to save net⁃work resources.Secondly,an attack model was established based on the influence of intermittent DoS attacks on ICPS limited by frequency and duration.ICPS subjected to DoS attacks was divided into active DoS attack system and dormant DoS attack system,and the current attacked states were reconstructed by some successful trigger states.An at⁃tack compensation mechanism based on dynamic estimator was proposed to ensure the asymptotic stability of the system during active DoS attacks.Finally,the piecewise Lyapunov functional method,Jensen’s inequality and Schur’s comple⁃ment lemma were used to obtain the stability conditions of the system.On this basis,a cooperative design scheme of adaptive event triggering parameters,observer gain and controller gain was proposed.The intermittent reactor system was used to simulate the stability of ICPS based on adaptive event triggering under intermittent DoS attack.The simula⁃tion results show that the adaptive event triggering strategy and the compensation mechanism based on the dynamic esti⁃mator can not only improve the stability of the system,but also effectively reduce the number of data transmission.The times of the system triggered by the static event triggering policy is about 4.5 times that of the system triggered by the adaptive event triggering policy.