基于相关分析的控制系统频率特性建模研究

摘要

控制系统频率特性建模是分析系统特性的一个重要途径,在控制系统的仿真分析和控制器设计中具有重要作用。文章总结出了通常使用的测量系统频率特性的方法：系统传递函数法;单位脉冲信号测试法;扫频法;随机信号测试法。同时,文章提出了基于相关分析的扫频法建立系统频率特性模型的方法,并采用基于多项式拟合方式的系统参数辨识完成系统频率特性建模。%The frequency modeling of control system is a very important way to analyze the system＇s characteristics, which is very im portant in the simulation of the control system and controller design. In this text, some usual methods to measure a system＇s frequency char- acteristics are given： transfer function method, unit-pulse method, frequency sweeping method, and random signal method. Simultaneously, a modeling method based on correlation analysis is proposed, and the modeling is finally completed by the way of polynomial fitting.