Design And Analysis Of Network Control System Based On Event-triggered Mechanism

Network control system is widely used in many fields such as smart appliances,industrial robots,aerospace equipment,etc.due to its significant advantages such as resource sharing,distributed control and intelligence.It is a hot spot in the development of industrial control.However,as the scale of the control system increases,the contradiction between limited network resources and increasingly complex control tasks becomes increasingly prominent,and the increasingly complex network structure demands for the security of data transmission in the network.Based on the above situation,this paper takes a class of linear network control system with limited network bandwidth resources as the research object,and analyzes the stability and security control of the system.Firstly,the stability and controller design of linear networked control systems under improved event-triggered mechanism are studied.A more general improved event-triggered mechanism is used to control the amount of data transmission in the network,and a Lyapunov-Krasovskii functional with as many system delay information as possible is constructed.Based on the Lyapunov functional theory and the improved free weight matrix method,the sufficient conditions for the asymptotic stability of the system and the controller design scheme are given.By comparing the simulation example with the event triggering scheme in the existing literature,it is verified that the event-triggered mechanism has a larger average transmission period,which can effectively reduce the amount of data transmission in the network and save more network resources.Then,considering the existence of external disturbances,the H_?control problem of network control system based on event-triggered mechanism is studied.The event-triggered mechanism is used to judge and filter the currently transmitted data packet,and the event-triggered mechanism is a special case of the above improved event-triggered mechanism.At the same time,the time-delay model including network delay and event-triggered mechanism is constructed by using the time-delay system method.A new type of discontinuous Lyapunov-Krasovskii functional is selected,the H_?stability criterion and controller design method of the system are given by the linear matrix inequality technique.Numerical simulation examples show the effectiveness of the method.Finally,considering the effects of network delay,external disturbance and network attack,the H_?filter design problem based on event-triggered mechanism is studied.An event-triggered mechanism is used to reduce the amount of data transmission in the network.At the same time,a Bernoulli variable is introduced to describe the random characteristics of network attacks.A H?filtering error system that can simultaneously describe the event-triggered mechanism,network delay and network attack is established.The mean square asymptotic stability criterion of the system is given by the linear matrix inequality technique.The criterion characterizes the event-triggered parameters,the probability of network attack,the delay parameter,and the constraints between the filter parameters.Based on this,the H_?filter design is performed.The effectiveness of the H_?filter design method is verified by simulation examples.