The Stability Analysis Of The Networked Control System With Time-Delay

The Networked Control Systems has the content of this thesis for its superiority as the development of the control system scale. Networked Control System is a new task of control theory in the 1990s, and Networked control systems are feedback control systems here in the control loops closed through the real-time network. It has a completely distributed structure where all the control applications are connected to the communication network directly. The structure develops data transmitting velocity, makes all users in different places share the resource and co-operation. Networked control systems can be found in industrial automation, building automation, power plant, robot, intelligent vehicle systems, advanced aircraft and spacecraft. This kind of networked control mode has many advantages, such as sharing information resource, simple and fast actuation, small volume of wiring, powerful configuration, powerful system diagnosis and maintenance. However, when the distributed applications implement over the control network, it is necessary to make the information collide and re-transmit because of information transmitted through the limited bandwidth and weight capability. There must be transmitting time delays. So it is important to study the control scheme for the networked control systems with transmitting time delays.Firstly, the conception, the contents and the present situation of the NCS are introduced; secondly, analyses the time-delays and gets the system models; based on above works, research on the time-delays between sensor and controller and controller and actuator, set up the multi-input multi-output model of the Networked Control System, then a design procedure is presented based on comparison theory and matrix measure. It ensures the system stable. Aiming at the time-delays, converts the uncertainty of time-delays to the uncertainty of the parameter matrices and it avoids the effect of asynchronousbetween the controller and the plant. The state feedback control gain can be abtained under the consideration of the requirement of bounded-control signals, through resolving the LMIs. The system is turned out stable by Lyapunov stability theory. Simulation example explains the validity of this control scheme.