Stability And H_∞ Control For The Networked Control Systems

With the development of automation and computer network, networked control systems (NCS) appears. And there has been considerable interest in networked control systems. The primary advantages of NCS are source enjoyed together, increased system agility, ease of system diagnosis and maintenance. However, because of inserting the networked into traditional control system and the limits of the network bend, so that it is inevitable that there exits the networked-induced delay, message collision, time sequence confusion and data packet dropout etc. They are the main factors to degrade the performance of control systems.Firstly, the basic problems and the modeling of networked control systems are presented. The mathematic models of networked control system with short time delay, longtime delay, multi-time delay, data packet dropout, both delay and packet dropout are established.Secondly, stability and controller for all kinds of models of networked control systems are reached, including the effect of sampling rate, short time delay, longtime delay, multi-time delay, data packet dropout, both delay and packet dropout.Finally, Based on the mathematical model of networked control system with uncertain time delay and multi-time delay,H_∞ property is analyzed, utilizing the Lyapunov method and the linear matrix inequality (LMI) approach. And a new γ -suboptional output feed back H_∞ controller is designed. The simulation results illustrate the validity of the proposed method.