natural frequency of vibration

Then the author analyses the effect of the frame vibration and tries to make the natural frequency of vibration beyond the range of engine revolution rate.

分析了发动机振源对车架振动的影响，使车架主要模态的自振频率避开了发动机转速范围；

SA (spectral acceleration) is approximately what is experienced by a building, as modeled by a particle on a massless vertical rod having the same natural frequency of vibration as the building.

而光谱加速度大致上是一座建筑物承受的加速度，科学家把一颗与目标建筑物具有相同自然频率的粒子放在一个近似无质量的垂直控制棒上进行模拟得出此数据。

In this paper, the natural characteristics of TSS will be analyzed firstly, and then the peculiarity of its frequency and vibration will be summarized.

本文第四章首先对张弦桁架结构的自振特性进行了分析，对其自振频率和振型的特点进行了总结。