【摘要】 分析了以往教材、参考资料中论述的在Ｂｏｄｅ图上应用Ｎｙｑｕｉｓｔ判据判稳方法，论证了以往的方法只适用于最小相位系统，而对非最小相位系统不适用，从而提出了改进含有积分环节的相频特性增补曲线及正负穿越的方法。更多还原

【Abstract】 It is demonstrated that the conventional methed for Nyquist criterion in Bode plot, assessing the control system stability, can be used only in the mininium plase system .It is improved by the aug mented curve of phase frequency characteristics and positive and negative push through method.更多还原