Event-triggered Stability Control Of Industrial Cyber Physical System Under DoS Attack

Industrial Cyber Physical Systems(ICPS)combines information systems with industrial equipment through wireless network to realize industrial intelligent computing,communication and control.However,ICPS due to the openness of the communication network is vulnerable to DoS attacks,so that industrial equipment failure,system operation performance significantly reduced,and even lead to system collapse.At the same time,ICPS in the actual industrial environment,computing and battery equipment and other resources are limited,in the solution of system security while considering the problem of limited resources.Therefore,this paper studies the security defense strategy under DoS attack from the aspects of stability control strategy and event triggering mechanism,and uses less network resources to achieve security and stability control of ICPS.The main research contents are as follows:(1)In ICPS with gap DoS attack,the event when the measurement channel is attacked triggers a stability control strategy.In order to improve the utilization of communication resources,based on the input-to-state stability theory,an ICPS model based on event triggering is constructed,and the lower bound of the event trigger interval is designed to avoid continuous event triggering.A predictor-based compensation strategy is constructed to effectively mitigate the active period of DoS attacks.The input-to-state stability theory is used to obtain sufficient conditions to ensure the stable performance of ICPS.(2)In ICPS with gap DoS attack,the adaptive events of the measurement channel and control channel are attacked to trigger the stability control strategy.An observer is constructed to estimate the unmeasurable system state,and a new adaptive event-triggered communication scheme is adopted to save network resources.An attack model is established by the influence of gap DoS attacks on ICPS limited by frequency and duration,and the ICPS attacked by DoS is divided into DoS attack active period system and DoS attack dormant period system,and the current attacked state is reconstructed according to the past successful trigger state,and an attack compensation mechanism based on dynamic estimator is obtained to ensure the gradual stability of the system during the active period of DoS attack.On this basis,a co-design scheme of adaptive event triggering parameters,observer gain and controller gain is proposed.(3)The distributed adaptive event-triggered stability control strategy of ICPS under random DoS attack was studied.Based on distributed wireless sensor network,a quantizer is introduced to construct a quantized ICPS model based on distributed adaptive event triggering to further save network consumption and reduce network transmission load.Establish closed-loop systems for event triggering,attacking,quantification,and network latency.The Lyapunov function and linear matrix inequality theory are used to obtain sufficient conditions to ensure the stability of the system.By solving the controller coupling problem,the output feedback controller gain is obtained.The gap reactor system and the four-capacity water tank system are used as the controlled objects,and MATLAB is used as the experimental simulation tool.Simulating the scenario of DoS attack in real industrial environment,the proposed event-triggered stability control strategy is effective and practical.The simulation results show that the designed event-triggered stability control strategy can reduce the impact of DoS attacks on the system under single-channel,dual-channel and distributed channels,and effectively reduce the utilization rate of wireless communication resources.