In the third part, the concept of coupling element is derived from the vibration analysis of a four-degree spring-oscillator system, and a whole transfer matrix method is developed on the basis of it.

第三章从一个四自由度弹簧振子的振动分析问题提出耦合单元的概念，建立了多转子系统振动分析的整体传递矩阵法；

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Since the gear engagement is a common coupling form between rotors, the transfer matrix of skew gear engagement in global coordinate system is deduced based on the concept of coupling element.

齿轮啮合是转子之间常见的一种耦合形式，根据耦合单元的概念，推导了在全局坐标系下斜齿轮啮合的传递矩阵。

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The coupling matrix of high-order element and other related formulas are developed and cast in a form that is convenient for computer programming.

给出了高次元的耦合矩阵和有关公式，并将它们表示成便于编制计算机程序的形式。

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