On The Control Of Networked Control Systems Based On Two Steps Transformation And Multi-rate

With the advancement of control technology and the rapidly development of control systems, a novel distributed networked control system emerged: Networked Control Systems (namely, NCSs). There are many new problems in NCSs, many classical control theories with ideal assumptions can not be applied to NCSs directly, these theories must to be amended even renewed.The control of NCSs based on two steps transformation is the core of the thesis. Firstly, when the network-induced delay is shorter than a sampling period, a new model of NCSs is got by two steps transformation, the existing conditions of asymptotic stability are proposed, and stabilizing controller is designed. Then, using the tool of two steps transformation and the approaches of Lyapunov, the finite horizon state feedback controller is proposed for short time delay NCSs based on the linear time-invariant system. Then, for short time delay, the stochastic control of infinite horizon NCSs is studied based on linear time-invariant system and two steps transformations. The proposed controller could render corresponding NCSs exponentially mean square stable.Next, the H∞control of NCSs with stochastic time delay is studied, the LMI-based sufficient conditions for the asymptotic stability of NCSs are proposed. The simple and convenient H∞controller is designed.Moreover, for the purpose of the further research of NCSs, the studying would be extended to the case of multi-rate from the case of single-rate. The concepts of single-rate NCSs and multi-rate NCSs are defined, the difference between both is pointed out. LQG state feedback is studied. And LQG state feedback controller is designed, and the controller is proved to render corresponding NCSs exponentially mean square stable.The object of study in thesis is a very hot research topic, and be of great theoretical significance, therefore the research has widest application prospect.