On networked control systems based on smith compensator

For the networked control systems with random time delay, the controller with Smith compensator is presented. The influences of network delay on the control system stability are first analyzed based on the root locus method,. Then the system model is established combining with Smith compensator, neuron controller and incomplete differential forward PID control algorithm. Finally, simulation research on a DC motor is done, and the simulation results show that better control performance is gotten when Smith compensator doesn´t match with the model of controlled object.