三次谐波近似分析法在非线性电液伺服系统中的应用

The Application of Similar Analysis Method of Three Degree Harmonic In The Nonlinear Electro-Hydraulic Servo System

在具有非线性环节的控制系统中,经常采用描述函数法进行系统的稳定性分析,一般的描述函数法由于没有考虑系统高次谐波的影响,其分析结果不一定准确,有时甚至是错误的。本文介绍了一种考虑三次谐波分量的新分析方法,可以简便地知道描述函数法所得结果的正确性。

In the control system with non-linear link, we can take the Describing Function Method often to analysis the stability of system. Because usual Decribing Function Method does not conside the influence of the higher degree harmonic, the conclusion may not be exact. Sometimes it may be fause infact. This paper introduces a kind of new analysis method for considering influence of Three Degree Harmonic, then obtains the proper of the conclusion which we reach by the Describing Function Method simply.