Research On Control Method Of Networked System With Limited Communication

With the rapid development of computer communication technology,intelligent sensor technology and control technology,the research of networked control system has been widely concerned in recent years.Compared with the traditional point-to-point control system,the networked control system has the advantages of simple,fast,less connection,resource sharing,reliability improvement,remote operation,etc.However,due to the limited communication network bandwidth,it inevitably brings network induced delay,packet dropout,media access constraints and other communication constraints to the system.The existence of these communication constraints,to a certain extent,affects the control performance of the system,and even leads to system instability.Therefore,it is of theoretical and practical significance to study how to solve the impact of these communication constraints on the network control system.This thesis studies the design of control methods for communication constrained networked systems with multiple communication constraints.The main contents are as follows:Firstly,for the networked control system with access constraints and packet dropout,the access constraints are described as Markov chains.The packet dropout phenomenon of each channel is described as obeying the independent Bernoulli distribution in the multi packet transmission mode.Based on those,the networked control system is modeled as the discrete-time Markov jump linear system.With the help of Lyapunov stability theory and linear matrix inequality method,the condition of system exponential stability is given,and the design of state feedback controller is realized.Finally,the effectiveness of the proposed method is verified by simulation.Secondly,considering the influence of access constraint and time-varying delay,the networked control system with network induced delay and access constraint is modeled as a class of discrete-time Markov jump systems with uncertainty.According to Lyapunov stability theory and state augmentation method,the condition of closed-loop system asymptotically stable is given,and the dynamic output feedback controller is designed.Finally,the effectiveness of the proposed method is verified by simulation.Thirdly,the stabilization control of networked systems with access constraints,network induced delay and packet dropout is studied.According to the statistical characteristics of various communication constraints,the networked control system is modeled as a kind of asynchronous dynamic jump system.Based on Lyapunov stability theory and switching system theory,the sufficient conditions for exponential stability of the closed-loop networked control system are given,and then the controller with dynamic compensation function is designed under the Markov random communication strategy.Finally,the effectiveness of the proposed method is verified by simulation.Finally,the work of this thesis is summarized,the research results of this thesis are given,and the future work of this topic is analyzed and prospected.