For three kinds of different soil layer construction, the characters of the platform values and the characteristic periods of ground surfaceacceleration response spectra were studied.
系统地研究了软夹层在底部、中部和顶部的三种土层结构的反应谱平台值和特征周期的主要特征。
2
It has also been clear that the source of piston knock noise is the impact between piston and cylinder sleeve by the vibration acceleration of the engine's body surface.
又通过发动机机体表面振动加速度，确定活塞敲击噪声产生的根源在于活塞与缸套的碰撞冲击。
3
"The plane appears to have hit the surface of the water in flying position with a strong vertical acceleration," he noted, adding that the plane's belly hit the water first.