模态分析是指采用振型分解法计算结构的各阶振型包括各阶模态的频率振型等指的是振型分解法中的一阶二阶振型
这是因为结构以某一阶模态振动时，将在其辐射噪声频谱上出现一个峰值。
Because the structure vibrates at some modal, a vibration peak value will appear at its noise frequency spectrum.
从图示的模态振型中，我们现在可以看出，有足够数量的点来描述每一阶模态的振型。
Now from the mode shapes shown we can see that there are sufficient number of points to describe the mode shape for each mode. But there are a total of 45 measurement locations on this plate.
而另外一阶模态可能具有与第一阶模态不同方向的响应，而在其他方向上几乎没有响应。
Yet another mode of the structure may have response in a different direction than the first mode with little or no response in the other directions.
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