看待这个问题的一种方法是，系统模态只不过是一组非常复杂的滤波器，在频率基础上具有将输入信号进行放大和衰减的能力。

One way to look at it is that the modes of the system are nothing more than a very elaborate set of filters which have the ability to amplify and attenuate an input signal on a frequency basis.

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本文采用改进的自由界面模态综合法计算汽轮机叶片组的固有振动。

In this paper, the improved free-interface coupling method is adopted for dyna - mic analysis of blade groups.

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本文利用一组实测的不完全模态对所考虑结构的有限元理论模型进行修正。

This paper has made use of a set of measured incomplete modes to improve an analytical finite element model of the structure under consideration.

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