Networked control systems based on new Smith predictor and internal model control

Some analyses and researches are done about networked control systems (NCS) those are based on the new Smith predictor and internal model control (IMC) from the system structures in this paper. The research and simulation results show that the choice of strategy of the new Smith predictor is more flexible than internal model control, but the adjusting parameter of the internal model control is relatively less than the new Smith predictor. Both of them are suitable for the NCS with random, time-variant or uncertain network delays which are larger than one or even tens sampling periods, also for a certain changing plant model (parameters).