Research On Control Of A Class Of Nonlinear Networked Control Systems Based On Switching

Network Control System (NCS, Networked Control System) is a closed-loop communication network control system which composed and operated by sensor, controller and actuator .In the network control system, the network serves as a medium to achieve the exchange of signal and data between system components and control signals which are arranged in different regions. Packet loss, transmit delay, and uncertainty are normal phenomenon in network control system, therefore the research of NCS is very complicated.Based on switching technology, this paper build a model for a class of nonlinear networked control system, then analysis the robust and optimal control characteristic of the model.The main results are as follows:Firstly, this paper introduces the production and research development of network control system, the status of current research and problems needed to be improved, and briefly illustrate the research and development of switched systems.Secondly, study the simple short delay and packet loss under a single packet transmission in the model of a class of nonlinear systems. Through these research this paper propose the model for network control system under the condition of long delay and packet loss over many packets, this is the foundation of the subsequent analysis, simulation and controller design .Thirdly, considering the system uncertainties exist in many cases, therefore it is critical to maintain the stability of switched systems. Through research, this paper concludes the conditions which make sure the robust quadratic stability of uncertain networked control systems stability under arbitrary switching cases.Finally, in order to analysis the stabilization of Markov properties short delayed nonlinear network control systems, this paper first build a mathematical model of the system, then based on the model this paper designed state feedback and output feedback controllers which can keep the stable of the closed-loop system. The simulation results demonstrate the validity and effectiveness of the proposed method. This paper also analyzed the optimal control of Markov properties long-delay nonlinear networked control systems, build a mathematical model and study the stochastic optimal control of the model.