The vibration of engine have 6-DOF, though The vertical rotation and parallel motion of engine is neglected because their extent is so small that they hardly effect our analysis.
发动机的振动具有6自由度，但是它的垂直转动和两个水平方向的平行移动是非常小的，忽略这些因素对我们的分析没有什么影响的。
Compared with the seismic responses of free homogeneous half space, the results present the effect of vertical cracks on the propagation of seismic wave and the ground motion near the fault site.
计算结果与均匀半空间自由场做了对比，以说明竖向地裂缝对地震波传播和附近地面运动的影响。
Seismic response of chimneys to combined horizontal and vertical ground motion is analysed in this paper. The effect of the geometric nonlinearity including vertical ground motion is considered.
本文对烟囱在水平与竖向地震动分量联合作用下的反应进行了分析，分析中考虑了包含竖向地震动的几何非线性的影响。
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