Research On Control Method Of Network Control System Based On Error Threshold Communication

With the rapid development of control systems in the distribution,intelligence and integration,there are some restriction on computing resource,communication resource and energy consumption for each network node to some degree.Obviously,there exist some limitations on the comprehensive utilization of resources based on the traditional periodic sampling(i.e.periodic time triggered).In other words,there is no doubt that distributed information obtained based on the Periodic Sampling transmitting to each nodes will increase the network load severely.It would be specially mentioned that the frequent transmission of data will aggravate the computational burden and energy consumption.In order to reduce the network resource and energy consumption,the control method based on the event-triggered has been paid attention in recent years.The event-triggered control is that the information transmission between nodes depends on the presetting rules and the system must meet some performance conditions.The presetting rules are called the trigger mechanism or event-triggered conditions.It has been proved that compared with the traditional sampling system,the event-triggered control can decrease the variance of the system output apparently for a random order system,which indicates this method has a great potential to reduce the utilization of the limited network resource.In this paper,the control method of network control system based on error threshold communication is studied.First of all,a discrete system model is established for the continuous linear control networked system.Some conditions which maintain the system asymptotically stable is given according to Lyapunov functional method and linear matrix inequality method(i.e.LMI).In addition,the uniform boundedness of the system under the event trigger method is achieved with the system convergence upper bound.The system state can be adjusted by changing the related parameters.Secondly,considering the network transmission with time delay and the absolute value error,a discrete linear system model in consideration of the network induced delays is established based on the networked control system and the event-triggered mechanism.A state feedback robust H?controller using Lyapunov functional method and LMI method is designed to keep the system asymptotically stable and H?performance.Also,the transmission rate between nodes declines effectively.Thirdly,above on the previous study,some research work on the uniformly boundedness for a kind of nonlinear networked control system based on the event-triggered is carried out.First,a discrete system model is established for the continuous nonlinear control networked system cooperating with some linearization methods.Then,a state feedback controller using Lyapunov functional method and LMI method which keeps the system asymptotically stable is designed.Next,the transmission rate between nodes reduces effectively.The control method to keep system uniformly bounded is also provided under the event-triggered.