模态试验的目的是要提取准确的系统动力学特性。
The goal of a modal test is to extract the accurate dynamic system characteristics.
那么当进行模态试验时，通常情况下是相对于一个特定的参考点采集所有的测量结果。
Now when a modal test is performed, typically all of the measurements are acquired relative to a particular reference.
针对某轿车开发过程中的地板振动问题，通过道路试验和模态试验，发现排气管的振动对地板振动影响很大，是地板振动的主要原因。
In this paper, focus on vibrating problem of floor during one sedan development, the author finds out the reason lies to exhaust pipe system by road test and modal test.
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