The effective law on the frequence and modal of vibration due to the fluid velocity, the fluid press and the number of elements was obtained.
得出流体流速、流体压力、划分单元个数等对管道的频率和振型的影响规律。
A good example of this brings to mind a recent modal test on a troublesome torsional vibration shaker system.
这个很好的例子使我想起了近期的一次模态试验，试验是在一个棘手的扭转振动台系统上进行的。
The identification of modal parameters of a vibration system by means of random response and free response signal is discussed.
本文讨论利用振动系统的随机响应和自由响应信号识别系统模态参数问题。
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