Study Of The Network Control Systems Based On TCP/IP Protocol

Network Control Systems (NCS) are the integrated area of traditional control technologyand information technology, which has been applied widely in various control applications. InNCS, all data of control systems are transmitted through network so that time delays areinduced inevitably. Therefore, as an interdisciplinary research related to control andcommunication, the problem of time delays is the center of the NCS research work.Through analyzing the influence of the time delay in network for the system, based on theforerunner's studying researches about the time delay, this thesis mainly analyzes the methodof the delay forecast evaluation--the average delay windows. This paper, aiming at thelocalization of the average delay windows, uses the BP arithmetic to modify the former.Combining the average delay arithmetic and the BP arithmetic, the paper brings forward theintelligent forecast method---BP-ADW Evaluation. At last the simulation test results are given.As for the controller, if the delays in the network can be evaluated accurately at any time,the whole system is taken as the system with certain delays. The design of the networkcontroller adopts the theory of the optimization and adopted the principle of Smith forecastevaluation compensation to solve the problem of the time delay.In order to validate the function of the system, this thesis designs the simulationenvironment of the network control system based on TCP/IP, working on VB. The systemadopts Winsock technology of Visual Basic to transmit the net data. The design of wholesimulation software integrates the technology of network transmission and the high effectcomputer ability and the speediness simulation ability of the control system simulation tool---matlab language.