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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。
This paper analyzes the application of the Nyquist criterion in the Bode diagram, which is discussed in previous textbooks and reference materials, and proves that the previous method is only applicable to the minimum phase system and not to the non-minimum phase system, The phase frequency characteristics of the supplementary curve and positive and negative through the method.