Ultimate Capacity Analysis And Research On Control Strategy Of A Precision Tracking System

Precision tracking system is a kind of system with high requirements for tracking accuracy,response speed,and anti-jamming capability.It involves semiconductor processing,military exploration,aerospace,biomedical,nanoscience and other fields.The precision tracking system reflects the overall level of the current control field.This article is based on the research project of a fast launch mirror precision tracking system.It mainly studies the system's ability limit and improvement issues.The idea of this paper is: according to the project requirements and the existing problems in the field of precision tracking,an exploratory search for an analytical design method suitable for most precision tracking systems,including the system's essential non-linear modeling,controller design,system performance limits Analysis,controller implementation,system improvement methods and many other aspects.The main work of this article is as follows.1.Aiming at the inaccuracy of the model,this paper conducts multi-path modeling of the fast mirror system and obtains three linear models.The noise and nonlinear parameters of the system are obtained through actual measurement analysis and theoretical calculation.Finally,by comparison,a noisy intrinsic nonlinear white box model suitable for the research of this system is obtained.2.Aiming at the inconvenient problem of classical controller design adjustment,a state-enhanced robust controller is designed using modern control theory.It can easily and flexibly change the controller parameters through the pole configuration,thus facilitating the physical limit of the search system.Under this controller,the following work is done:(1).Pole search scheme problem: Convert polygon face search into line search,and give the initial dominant pole determination method and search scheme;(2).System limit performance summary: Through the simulation study,the relationship between the system's limit performance index,input signal and physical limit is obtained;(3).System robustness detection: Robustness testing was performed using the univariate method.The results show that the electromagnetic force coefficient of the motor is more sensitive than the back electromotive force coefficient.When the variation exceeds 40%,the system will be unstable.(4).When the system has the maximum linear bandwidth,the uniaxial dynamic characteristics and steady-state accuracy of the system are analyzed.The tracking characteristics of the two-axis joint simulation tracking standard circle are summarized and analyzed.3.Because the controller obtained through the state-enhancement design has difficulty in realization,the state-enhancement controller in the modern control is augmented by an observer.The robust controller is model-equivalent and reduced in order to obtain the classical control of integrating the lead plus the notch.Device.And this controller was verified,and its effect is consistent with the effect of augmenting the robust controller.It is concluded that in the development of the system,the current control system can be used to analyze the design system and use classical control theory to achieve it.4.The integral,special notch and advanced controller for equivalent reduction gives two methods of realization,one is the digital method;the second is the analog method.Among them,using Multisim simulation software to build the analog circuit,by comparing the Bode diagram of the controller,verify the correctness of the circuit construction.Finally,some suggestions for improving the problems of the rapid mirror system studied in this paper are put forward.