Research And Design Of Several Networked Control Systems Based On Event-triggered Mechanism

Due to the high-speed development of communication technology in recent years,network control systems(NCSs)with widespread application prospects has received great attention and achieved rapid development.However,opportunities and challenges coexist.Although network control systems have the advantages of convenient installation and maintenance,low cost,high reliability and resource sharing,the transmission of control signals through the network also brings problems,such as communication delay,packet loss,misordering,network congestion and random disturbance,which brings many challenges to the stability analysis and comprehensive design of control systems.In order to save the limited bandwidth and computing resources in the communication network,many scholars introduced event-triggered mechanism into the network control systems.However,many limitations in the research results of eventtriggered network control systems still exist,such as,the continuous trigger mechanism that uses the special sensor to continuously measure the target information and generates the trigger signal,most of which are difficult to achieve because of the high cost.The system data transmission rates are unable to significantly reduce.There are few cases involving multiple communication channels or distributed trigger architecture.Based on the analysis and summary of the background of related topics and existing research results,the following contents are studied in this paper.Considering a networked control systems with network induced delay and packet loss compensation,the problem of state feedback system H? controller design based on event triggering and communication channel backup transmission compensation scheme is studied in this paper.On the basis of considering distributed event-triggered mechanisms(DETMs),compensation mechanism based on dual communication channel sharing,a closed-loop model of continuous time networked control systems is established.By introducing packet loss compensation method based on dual communication channel sharing,the problem of networked control systems with network delay and packet loss compensation is studied.Considering a networked control systems with time-varying sampling and packet loss,the H? controller design problem of static output feedback system based on event triggered mechanism is studied in this paper.For this kind of non-uniform periodic sampling system,whether the sampled data needs to be transmitted is determined by the event trigger condition designed in advance.The specific performance of an event triggering mechanism in this paper is that,when the error between the current value of output and the previously transmitted value changes too much compared with the latest measured output,the mechanism will invoke the current sampling trigger data for transmission.The output feedback controller can guarantee the expected H? stability performance when considering both communication and control at the same time.Finally,a numerical example is given.Considering a networked control systems with distributed event triggered mechanism and network induced delay,a system solution of event-triggered H? control based on linear distributed system is proposed in this paper.Firstly,an event-triggered mechanism with distributed structure is proposed.In this method,whether the sampling data of each sub-channel should be transmitted or not is only determined by the corresponding trigger conditions of the sub-channel.Then,a distributed event triggered network control systems model with data buffer and relying on sub-channel information is established.Secondly,based on distributed event triggered mechanism,the robust performance stability analysis and H? controller design method of networked control systems are presented.Finally,an illustrative case is given.