Control Technology, The Robustness Of The Control System Based On Packet Loss Network Switch Model

With the development of automation and computer network, networked controlsystems (NCS) appears. Innovation of information brings far-reaching effect andchallenge to automation. In recent years there has been considerable interest in networkedcontrol systems. The modeling, stability analysis and controller design in networkedcontrol systems are studied in this dissertation.Firstly, the basic problems and the modeling of networked control systems with datadropouts are presented. The mathematic models of networked control system with singlepacket transmission with data packet dropout and multiple packet transmission with datapacket dropouts are established. Based on the theories of Asynchrononous DynamicalSystem(ADS), the stability and the data dropout margin of networked control systems arestudied. Numerical simulation proves the effectiveness of the above method.Secondly, based on the switched model, we study the control method of networkedcontrol systems with data-packet dropouts. The switched model with an open-loopobserver and a close-loop observer is established. A compensation method is presented forthe date-packet dropouts. The observer and controller are designed. Numerical simulationresults illustrate the effectiveness of the proposed method.Finally, we study the control of networked control systems with data-packet dropoutsand with external disturbances. The uncertainty model of networked control systems withdate-packet dropouts is established. The state feedback H_∞controller is designed.Numerical simulation results show the controller design is effective.