Asymptotic Tracking Controller Design For Event-Triggered Networked Systems With Time-Frequency Performance

At present,a large number of scholars are devoted to the research of Networked Control Systems(NCSs).In this paper,the asymptotic tracking controller of event triggered network system under the action of time-frequency performance is designed.After searching,there are many researches on system performance improvement in the frequency domain and on system performance enhancement in the time domain,but few of them consider both performance enhancements.The time-frequency performance considered in this paper is that?-stability method in time domain and H_?performance in frequency domain act on the tracking controller at the same time.The work is mainly carried out in the following aspects:The problem of reference model output tracking control is studied with time-frequency performance for event-triggered networked systems.Firstly,an?-stability method is used to translate the region where the poles are located,and then a linear closed-loop system is established by introducing state feedback control as the input and the reference model system.The closed-loop system is modelled as a time delay system subject to the trigger condition and the network-induced time delay.Then,based on Lyapunov stability theory,Young's Inequality,Schur's Complementary Lemma and H_?performance is derived as a condition for the existence of a controller with time-domain performance?-stability and frequency-domain disturbance suppression performance of the system before translation.Then,the nonlinear terms contained in the matrix inequality are processed to establish the design method of asymptotic tracking controller with time-domain performance.The problem of asymptotic tracking control with time-frequency performance is studied for networked systems with DoS attacks.First,the impact caused by the DoS attacks are introduced as uncertainty into the dynamic event-triggered scheme,the controlled object is panned to facilitate regional pole constraints,and then the reference model system uses state feedback to form a closed-loop control system.Then,based on Lyapunov stability theory,Young's Inequality,Schur's Complementary Lamma and dynamic event-triggered condition,we derive the conditions for the existence of asymptotic tracking controller with alpha stability and frequency domain performance perturbation suppression before translation,and continue to use some special derivatives to process the nonlinear terms contained in the matrix inequality to make.The asymptotic tracking controller is designed to ensure that the system tracking performance can be adjusted by the time-frequency performance when the system is attacked by DoS.Finally,the above results are verified.To consider the practical application of the research results in this paper,the traditional hydraulic servo position system is combined with the theory of networked control system by taking the hydraulic servo position system as the controlled object,so that the system can track the upper reference model output and verify the practicality of the previously proposed method.