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Robust Control Research of Networked Control Systems with Time-delay

Author: ZuoHuiPing
Tutor: TangGongYou
School: Ocean University of China
Course: Computer System Architecture
Keywords: time-delays networked control systems (NCS) disturbances linear matrix inequality (LMI)
CLC: TP13
Type: Master's thesis
Year: 2011
Downloads: 51
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Abstract


Along with the widespread use of computer networks and the development of network technique, the network control system theory is more and more valued by people. The information transmission of network control system is carried out through the network, and network bandwidth is limited, so packet collisions and queuing problems are prevalent in the process of transmission. In addition, the time delay and external disturbances are inevitable in the process of transmission, and will affect the performance of the system, even affect the stability of the system. Therefore, it is a very significant research task for Robust Stabilization of delayed networked control systems.In this paper, the problem of robust stabilization of delayed networked control systems is studied. For the uncertain delay and the dynamic characteristics of a known external disturbance, the network control system model is changed into a discrete time model with uncertain factors. Then, by applying the Lyapunov stability theory and linear matrix inequality approaches, some sufficient conditions are derived to ensure the asymptotical stability of the closed-loop system. Finally, simulation examples show the effectiveness of the proposed method. The main research content as follows:1. Summarize the theory of linear systems, delay systems and network control systems, and introduce the main research method and status of this field. Describe the methods and development status of robust stabilization of delay systems at home and abroad. The mainly results of the dynamic output feedback are analyzed.2. The problem of dynamic output feedback stabilization for linear systems with delay and external disturbance is studied. Using the Lyapunov stability theory and linear matrix inequality approach, some sufficient conditions are given to guarantee the asymptotical stability of the closed-loop system. Finally, a simulation example shows the effectiveness of the proposed method.3. The robust stabilization of delay networked control systems with external disturbance is investigated. Firstly, the network control system model is changed into a discrete time model with uncertain factor by utilizing the model transformation. Secondly, by applying the Lyapunov stability theory and linear matrix inequality approaches, some sufficient conditions are given to guarantee the asymptotical stability of the closed-loop system. Finally, simulation examples demonstrate the effectiveness of the proposed method.

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