Research On UDE-based Control Strategy For Engineering System

In practical problems,any engineering system is subject to varying degrees of uncertainty and external disturbance,which is inevitable.How to eliminate the influence of uncertainty and external disturbance is a very important problem in control system design.Whether it is the internal uncertainty of the system or the interference of the external environment,it may have a great impact on the accurate operation of the system.This requires us to focus on the above issues when we control the system effectively.The control method based on uncertainty and disturbance estimator has attracted extensive attention in the industry because of its simple and effective control idea and excellent performance in dealing with system uncertainty and external disturbance.The core idea of this method is to use a filter to estimate the unknown part of the system according to the known part of the system.In this paper,a new dynamic feedback control method based on uncertainty and disturbance estimator is designed by combining the control method based on uncertainty and disturbance estimator with dynamic feedback control method.This control method is not only as simple and physically realizable as the dynamic feedback control method,but also has the advantage of ude control method in dealing with system uncertainty and external disturbance.The specific applications are as follows:Firstly,it is applied to the anti-synchronization control of a class of systems with both model uncertainty and external disturbance.Then a dynamic feedback controller based on ude is designed according to the uncertainty and disturbance system.Finally,taking 4D system as an example,the performance of the controller in antisynchronization control is proved by numerical simulation.Secondly,the partial anti synchronization of the system is studied.Firstly,the definition of partial anti synchronization is given.Then we study the existence of partial anti synchronization of the system under this definition.Next,we design an algorithm based on the existence of partial anti synchronization of the system to find all the solutions that can achieve partial anti-synchronization,and further calculate the corresponding nonsingular transformation matrix.Under the action of this matrix,the system is divided into two subsystems.Then a dynamic feedback controller based on uncertainty and disturbance estimation is designed to realize partial anti synchronization.Finally,Lorenz system is taken as an example to verify the theory.Thirdly,the synchronization of projection system is studied.Firstly,the definition of projective synchronization is given,under which the projective synchronization is studied.Then,based on the existence of projective synchronization,all the solutions that can achieve projective synchronization are solved,and a nonsingular matrix is designed.Under the action of the matrix,the system is transformed into two subsystems.Next,for the system with uncertainty and disturbance,a dynamic feedback controller based on uncertainty and disturbance estimator is designed to realize the projective synchronization of the system.Finally,Chen Lee system is taken as an example to verify the above theory through numerical simulation.