Network Control System Of The Study Of Random Time Delay And Packet Loss Issue

This thesis emphatically discussed the random time delay and random packet loss in NCS. The model of NCS with random time-delay was built, and its asymptotic stability was analyzed based on the model. For the random packet loss, Model of single-packet transmission system and multiple packet transmission system along with short time-delay was built, and its exponential stability was analyzed.On the analysis of random delay, the delay compensator was respectively designed in the controller node and actuator node, the normalization of the weighted average method was used to estimate the time-delay, and the Smith estimation method was improved. So, improved Smith predictive compensation scheme based on the normalization of the weighted average method was proposed. Simulation based on matlab was done. The result proved the reliability of the scheme. The method is not only effective for short time-delay system, but also has better control effect of the long time-delay system.According to the research about packet loss, the model was built. This article innovatively designed the method to predict and compensate the packet loss in controller node and actuator node based on the forgetting factor method. The optimal feedback control law was designed. Finally, the simulation under matlab proved the feasibility of the proposed scheme.At last, this paper discussed how to use truetime to simulate for NCS. Then simulation under LON-bus was done for analysis of the impact of the load to the influence of system performance. The influence of sampling period on NCS was analyzed through simulation.