Analysis And Control Of Nonlinear Networked Systems Based On Event-triggered Scheme

With the development of Internet technology and communication technology,networked control systems have gradually become the research focus of the automation field due to their low cost,high reliability and information resource sharing.Due to the limitation of network bandwidth,the traditional time-triggered mechanism periodically triggers control task,which causes a large waste of resources.In recent years,the event-triggered mechanism has effectively overcome the unnecessary waste of the network resources caused by the time-triggered mechanism,and the application is more and more extensive.In this paper,for the nonlinear networked control systems,the T-S model is used to describe the nonlinear system,and the event-triggered mechanism is designed to reduce the usage of network resources.By designing new control algorithms,the impact of the network-induced factors such as data loss,network delay and quantization are reduced.The research content of this paper includes the following three parts:1.For the nonlinear networked control systems with communication network between the sensor and the controller,consider the impact of data loss and network delay on the system,and reduce the usage of medium-band resources in the data transmission process by introducing an event-triggered mechanism on the communication link.In addition,by introducing a saturation link in the actuator to prevent system's instability and poor performance due to excessive system input.Based on this,a design method of H_? state feedback controller which can guarantee the stability of the system and effectively suppress the interference is proposed.2.For the nonlinear networked control systems with communication network between the sensor to the controller and the controller to the actuator,an event-triggered mechanism is designed in the communication links to select the necessary data to be transferred to the network in order to reduce the frequency of the usage of controllers and actuators.On this basis,a state feedback controller is designed to ensure the stability of the closed-loop system and reduce the impact of data loss,delay and quantization error on the system performance.By solving the convex optimization problem,the system can achieve the optimal level of H_? interference attenuation.3.For the nonlinear networked control systems with communication network between the sensor to the controller and the controller to the actuator,assuming that the system state is not fully measurable,an observer is introduced to reconstruct the unmeasured system state.Considering the impact of data loss,quantization,and hybrid delay(random delay and distributed delay)on system stability,design an event-triggered mechanism that relies on measurement output and control input respectively in the communication links between the sensor to the controller and the controller to the actuator.On this basis,the output feedback controller based on the bilateral event-triggered mechanisms is designed to optimize the control performance of the network while guarantee the stability of the system.