Research On Networked Control System With Time-delay Based On LMI

With the development of communication network technology, there is an increasing tendency to apply communication network to complicated control systems. Networked Control System(NCS) is a kind of closed-loop control system composed with devices through the network, which is the syncretic result for communication network technology and control technology. Compared with traditional system of point-to-point structure, NCS has many advantages, for instance, easy to expand, maintenance simple, high systemic reliability and the resource communion, and so on. NCS can be observed in many areas such as tele-operation?automation traffic?aerial vehicles, modern manufacturing pants etc. However the network inevitably brings new challenges. Time-delay, data packet dropout etc, reduce systems' stability and property. The modeling and control problems of NCS become the hot spot of NCS research field. The NCS with time-delay and data packet dropout is discussed in this thesis, based on the Lyapunov theory and LMI, and a simulation model of Wireless Networked Control System(WiNCS) is established. The following Problems are studied.Firstly, the NCS with time-delay and data packet dropout is modeled as an asynchronous dynamical system(ADS). By exploiting a Lyapunov functional, the stability criterion of the NCS, and the controller gainer are obtained. Numerical example shows the validity.Secondly, the NCS with uncertain time-delay is modeled as a system with uncertain parameters, aiming at NCS, which state variables are not obtained as some reasons, A new guaranteed cost function-the observer based guaranteed cost function is given, and the guaranteed cost controller is designed. Numerical example shows the validity.Finally, based on Simulink, a simulation model of WiNCS using the TrueTime toolbox is established. The effect of the path loss to the WiNCS is analyzed, and the state space model of NCS and the simulation programming is given.