Study On Event-Triggered Control For Networked Control Systems With Resource Constraints

In order to save resources such as limited network bandwidth,network control systems(NCSs)based on event triggered schemes(ETSs)have received extensive attention from scholars at home and abroad,and a number of important pieces of work have been reported.However,there also exist some drawbacks in the existing results:(1)Most of the results only consider the single-side triggered condition of the event trigger on the sensor side.It is seldom studied that both the sensor side and the controller side have the dual-side triggered condition of the event trigger.(2)Most works study the stability analysis of event-triggered NCSs using given controllers.However,it is also seldom considered the joint design methods for controller and ETSs.To overcome the above drawbacks,it is necessary to propose a new and efficient ETSs,and study the stability analysis and controller design of the system under the relevant scheme.The main research contents of this thesis are as follows:(1)For resource constrained NCSs,event-triggered control(ETC)based on state feedback is studied.In order to reduce the use of resources such as network bandwidth,firstly,a dual-side asynchronous adaptive ETSs is proposed,which introduces an adaptive event-triggered that can dynamically adjust the triggered threshold on the sensor side and the controller side respectively,implementing asynchronous triggered.Then,based on the ETSs,the closed loop time-delay model of the system is established.Finally,the H_?stability criterion for guaranteeing system performance is obtained,and the joint design methods of controller and ETSs is given.Simulation experiments show that this method not only satisfies the H_?control performance requirements well,but also saves a lot of network resources.(2)For the resource constrained network control system with unmeasurable state,the ETC based on output feedback is studied.Firstly,a dual-side asynchronous adaptive ETSs based on object output information and controller information is proposed.Then the closed loop time-delay system model of the system is established.Finally,the stability and H_?performance of the system are analyzed,and the sufficient conditions for designing the dynamic output feedback controller and ETSs are given.Simulation experiments show that this method can effectively reduce the amount of data transmission in the network while satisfying the system H_?control performance.(3)In order to further save resources such as network bandwidth,based on the dual-side asynchronous adaptive ETSs,a dual-side quantizer is introduced,and ETC based on quantitative feedback is studied.Then,a closed-loop time-delay system model including ETSs,quantification and characterization of network performance parameters is established.Finally,the sufficient conditions for satisfying the stability and H_?performance index of the system are given in the form of linear matrix inequalities(LMI).The feedback gain matrix and ETSs parameters are designed.Simulation experiments show that this method not only effectively reduces the network load,but also satisfies the desired H_?control performance.