Analysis And Output Feedback Control Of Event-triggered Nonlinear Networked Control Systems

Networked control systems(NCSs)arise in continuous upgrading of control systems in the development of network and communication technology.Because of its own superiority,it plays an important role in UAV,smart grid and telemedicine,but there has always been a problem of limited system resources.The emergence of event-triggered mechanisms(ETMs)effectively alleviates this problem.The system realizes on-demand output,improves the quality of network service and reduces resource waste.Therefore,the cooperative design of ETMs and controllers has attracted the attention of many scholars.Takagi-Sugeno(T-S)fuzzy model is widely used because it connects nonlinear systems with linear systems by membership function and can approximate arbitrarily nonlinear systems.On the basis of summarizing domestic and foreign research work,this thesis studies the event-triggered output feedback control problem of nonlinear NCSs by combin-ing the theory of time-delay systems,Lyapunov stability theorem and inequality methods.The main contents of this thesis are presented as follows:(1)To solve the problem of poor adaptability of static ETMs when the state of controlled object changes,the dynamic output feedback H_?control problem of nonlinear NCSs is studied based on T-S fuzzy model and adaptive ETM.Considering that the controlled object and the controller have the incomplete matching membership function,the closed-loop control system is established by using the time-delay systems modeling method.Through theoretical analysis and derivation,a set of linear matrix inequalities(LMI)can be obtained,and the corresponding parameters can be solved to realize the cooperative design of adaptive ETM and controller,and its effectiveness is verified by numerical simulation.(2)Aiming at the problem that Denial-of-Service(DoS)attacks in NCSs can affect system transmission,the joint design of a class of nonlinear NCSs observer and controller is studied.Considering the influence of DoS attack on the actual input of the observer and the actual output of the controller,and combining with the T-S fuzzy model and DoS attack model,a switched closed-loop control system is established.Through theoretical analysis and derivation,a joint design scheme of observer,controller and flexible ETM in the sense of Global Exponential Stability(GES)is given.Finally,an example is used to verify the effectiveness of the proposed method.