数字控制系统的自振荡分析——离散描述函数法及其应用

ANALYSIS OF SELF-SUSTAINED OSCILLATIONS IN DIGITAL CONTROL SYSTEMS——THE DISCRETE DESCRIBING FUNCTION METHOD AND ITS APPLICATION

摘要: 本文介绍了用于分析非线性采样系统的离散描述函数法，用离散傅里叶变换分析和推导了量化非线性的离散描述函数，给出了简单明了的结论，可用于指导数字控制系统的设计．

Abstract: The discrete describing function method for nonlinear sampled-data systems is introduced in this paper.The discrete describing function(DDF)for the nonlinearity caused by amplitude quantization is analysed by using the discrete Fourier transform,The result obtained in this paper is clear and simple and can easily be used in thedesign of digital control systems.