过程曲线的低频逼近二阶模型

Second - Order Model of Process Curve Approached at Lower Frequency

提出一种新的根据系统的过程曲线建立二阶近似模型的方法,其结果近似于当已知高价模型用pade法降阶时所得到的二阶逼近模型,它比传统方法有更好的低频逼近精度和对采样周期的稳定性。

A new method of setting up a similar second -order model according to the system's process curve is presented. The result is approxiamtly equals to doing so with Pade Order-Decreasing method when high-order model is known, it is better than the traditional for its approaching accuracy at lower frequency and stability of sampling period.