摘要
本文给出一种改进的奈奎斯特（Ｎｙｑｕｉｓｔ）曲线绘制方法———径向压缩法，利用它可以很好地解决常规奈奎斯特曲线不能同时清除地表达一个复杂系统低频段、中频段和高频段频率特性的问题利用径向压缩法绘制的开环奈奎斯特曲线，对判定闭环系统稳定性和估算相角裕度没有影响。
In this paper, the author has proposed an improved method of drawing Nyquist curves, called radial compressing technique With using this method, it would be no longer difficult to present completely and distinctly the frequency feature of a complex control system from low to high frequency The modified Nyquist curve by this method has not any influence on stability critieria and evaluation of phase abundant But the gain abundant measured in the Nyquist diagram must be corrected
关键词
自动控制
频率特性
奈奎斯特曲线
径向压缩法
automatic control, stability, frequency feature, Nyquist curve, radial compressing technique
