Networked Control Systems With Random Packet Dropout And Channel Access Constraint

With integrated feature of computer, communication and control, networked control systems can make full use of communication networks to connect sensors, controllers and actuators together. So it is a distributed and networked real-time feedback control system. However, due to the limited bandwidth of the communication network at any given time, only a limited number of actuators can communicate with the controller and packet dropout may occur during the transmission. Therefore, the research of networked control systems with packet dropout and channel access constraint has both theoretical and practical significance.Based on the previous research, jump linear system theory, Lyapunov analysis method and linear matrix inequalities approach are used to analyze the networked control systems with random packet dropout and channel access constraint. Its main content is as follows:First, a study of networked control systems with random packet dropout is conducted in this paper in which the packet dropout process under multi-channel strategy is described as an independent and homogeneous Markov process. Lyapunov analysis method and jump linear system theory are used to obtain the sufficient condition ofλexponential stability. Combined with actual situation, two different kinds of controllers are designed based on whether the system jump parameters are known. The correctness of the results are verified by MATLAB simulation and extended to the situation of Bernoulli packet dropout.Then, this paper continues to study networked control systems with random packet dropout and channel access constraint in which the process of packet dropout is modeled as an independent and identically distributed Bernoulli process and the channel access constraint problem is described as an event-driven Markov process. By analyzing and using linear matrix inequalities approach, a sufficient condition ofλexponential stability and controller design methods are obtained and the results are verified by MATLAB simulation.Finally, a summary and outlook is given.