Observer-based Stabilization And Robust Stabilization Of Networked Control Systems

The network control system has the advantages of low installation cost,easy maintenance and so on,and has been widely used in the field of modern control.The network control system is a distributed system that includes sensors,actuators,and controllers.Each component communicates with each other over a network according to a predetermined transmission protocol.Due to the transmission of information through the network,there are problems such as transmission time delay and packet loss in the network control system,which causes new difficulties for the analysis and control of the system.Network control system modeling and control research has been more and more control theory and application researchers attention.In this paper,the Markov chain is used to model the network control system,and then the problem of stabilization and robust control is studied.The main achievements are as follows:1.In order to solve the problem that the induced time delay and the state are not easy to be measured in the networked control system,a design method of the mean square stability controller based on the state observer is proposed.Firstly,the system is modeled as a Markov jump system by using the variable period sampling.Then,the mean square exponential stability of the closed-loop system is proved.Finally,a design method of observer and controller feedback gain satisfying the line matrix inequality form is given.The stability control studies of the vehicle pendulum system in the numerical examples and network environment show the effectiveness of the controller design scheme.2.The robust stabilization control of a networked control system with random delay and random interference is studied.Firstly,the Markov jump model of the system is established under the unknown condition of state transition probability by using the variable periodic sampling method.And then the robust controller design scheme based on state observer is proposed,and the stability of closed-loop system and H_? performance are analyzed.Finally,a design method of observer and controller feedback gain satisfying the line matrix inequality form is given.Numerical simulations and robust simulation of vehicle pendulum system are presented.Theeffectiveness of the proposed robust stabilization scheme is verified.