Research On Tracking Control Of Networked Control Systems With Hybrid Cyber-Attacks

In recent years,the tracking control problem has attracted much attention in the control field,and has been applied in many industries,such as robotics,flight control,multi-agent,etc.The core goal of tracking control is to make the state trajectory of the system to track the state trajectory of a given reference model as closely as possible by designing an appropriate controller.At the same time,with the rapid development of the industry,the networked control system has been widely used in industrial control due to its advantages of easy installation,low cost and easy maintenance.However,due to the openness of the network environment,the network is very likely to be attacked by malicious signals,including deception attacks and denial-of-service attacks(DoS attacks),which will greatly reduce the performance of the system.It is worth noting that the periodic sampling mechanism may cause a large number of unnecessary signals to be transmitted on the communication network,which may result in wasted network bandwidth and network load.To solve this problem,an event-triggered scheme is introduced,which allows data to be transferred only when the triggering conditions are met.Therefore,the event triggering scheme can reduce the transmission of sensor measurement signals as much as possible,which is beneficial to saving network resources.According to the above analysis,this paper studies the tracking control problem for networked control system based on the event-triggered mechanism,considering the impact of hybrid cyber-attacks including deception attacks and DoS attacks on data transmission in the network.The main research contents of this paper are as follows:(1)For a class of linear networked control systems,the design method of tracking control based on event-triggered mechanism is studied considering the impact of hybrid cyber-attacks.An event-triggered mechanism is introduced to select the necessary sampling packets,thus saving communication resources.In addition,assuming that the process of data transmission to the controller is completed through a network that is subject to deception attacks and DoS attacks,a new tracking error model for networked control system is constructed based on this.Based on this error model,a control scheme of networked control system is established by using the Lyapunov method and linear matrix inequalities to drive the state of the system to track the state of the reference model.Finally,the feasibility of the tracking controller design method is proved by two simulation examples.(2)For a class of nonlinear network control systems,based on dynamic event triggering mechanism,and considering the impact of hybrid cyber-attacks including deception attacks and DoS attacks,the tracking control problem of interval type-2 T-S fuzzy model is studied.The nonlinear system is described by the interval type-2 T-S fuzzy modeling method.In order to save limitted bandwidth resources,this paper adopts a dynamic event triggering mechanism whose triggering parameters are determined by a dynamic variable,which can better cope with the changing system.Finally,an interval type-2 T-S fuzzy controller is designed and a closed-loop tracking error system is constructed.By constructing a reasonable Lyapunov function,the sufficient conditions for the tracking system to satisfy the expected tracking performance are deduced.Using linear matrix inequalities,a tracking controller design with expected tracking performance is obtained.Finally,the feasibility of the method is verified by introducing a mass-spring-damper system.