基于相关分析的控制系统频率特性建模研究

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。

Research on Frequency Characteristics Modeling of Control Systems

The frequency modeling of control system is a very important way to analyze the system’s characteristics,which is very important in the simulation of the control system and controller design.In this text,some usual methods to measure a system’s frequency characteristics 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.