直流伺服系统模型及其辨识

DC Servo System Model and its Identification

伺服系统又称为随动系统，是构成自动化体系的一种基本环节，是由若干元件和部件组成的具有功率放大作用的一种自动控制系统。系统辨识是指当用户无法从物理上得出所研究系统的数学模型，但可以通过适当的实验手段测试出系统的某种响应信息时，就可以根据它来获得系统的数学模型。本文完成了对直流伺服系统的建模以及辨识，尤其是利用系统的阶跃响应数据对直流伺服系统的模型进行了直接辨识，即由系统阶跃响应采样数据构造线性方程组，通过对方程组求解估计出系统参数。最后，对辨识出的系统进行了仿真，将仿真结果与原阶跃响应数据比较，表明所采用的辨识方法取得了良好的效果。

Servo system is also called ＂Follow-up system＂; it is a kind of fundamental links of constituting automation system. In this paper, the DC servo system modeling and its identification are achieved, especially, the direct identification for the model of the DC servo system is implemented by using the step response data of the system. Finally, the identified system is simulated, by comparing the simulation result with the original step response data; it shows that the adoptive identification method has obtained a good effect.