Control And Filtering For Event-triggered Networked Control Systems

With the widespread use and continued development of computer communication network information processing and communication technologies in recent years, information integration and control theory have gotten more and more attention from scholars. Researches on network control system (NCSs) have also made some significant progress. However, the network communication bandwidth and resources are limited in NCSs, in order to reduce unnecessary waste, event-triggered communication mechanism is needed. Affected by constrains in communication networks, network control system based on event-triggered strategy, in some cases exhibit relatively poor performance or even instability. Therefore, finding new approaches about analysis and design for event-triggered networked control system is necessary.In this thesis, we consider event-triggered network control systems control and filtering problem under one or more communications restrictions. Firstly, for NCSs with time-varying delay and event-triggered mechanisms, the problem of H∞control problems is considered. By using Lyapunov functional method, the sufficient conditions which can make the system asymptotically stable have been described by linear matrix inequalities is obtained. Based on these conditions, the H∞controller design method is presented.Secondly, taking the transmission delay, state quantification and control input quantization, and event-triggered communication mechanism into account, a new event-triggered networked control systems model is constructed, the stability criterion guaranteeing the closed-loop systems asymptotically stable and achieve the given L2performance indicators is presented. Based on the criterion, a quantitative L2controller design method is obtained.Finally, the H∞filtering problem for a class of event-triggered wireless sensor network control systems is investigated. Firstly, the trigger conditions for wireless sensor sampling data transmission, variable time delay and time triggered is given, then taking the impact of communication mechanisms into consideration, a filtering error system model is established, by using Lyapunov theory and linear matrix inequality technique, the error system H∞stability analysis problem is considered, then the system H∞filter design method is given.