From modal analysis theory, we can easily show that only one reference is necessary in order to determine all of the modes of a system - at least from a theoretical standpoint!
根据模态分析理论，我们很容易说明为了估计一个系统的所有阶模态，只需要一个参考点—至少从理论的角度来看！
Now there is much more to it all but this is just a very simple explanation of modal analysis.
然而模态分析的内容还有很多，这只是一个非常简单的解释。
Modal analysis is mainly used to identify the vibrating characteristic of the framework, also it is the base for all other type of dynamics analysis.
模态分析主要用于确定结构的振动特性，是其他各类型动力学分析的基础。
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