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；
Finally, coupling analysis is conducted to calculate the coupling degree of the coupled design to provide criterion for the evaluation and the selection of the coupled design scheme.
最后对耦合设计方案进行耦合性分析，计算耦合度指标，为耦合设计方案的耦合性评价及其选择提供依据。
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