本文还定量分析了海底土体对波浪周期性荷载的动力响应，并对其不稳定性机制进行了探讨。
This article quantitatively analyses the dynamic response of seafloor soil under the cyclic loading of waves and discusses the instable mechanism of soil.
轴系装置由于不仅具有惯性而且具有弹性，因此在周期性荷载作用下，会产生扭转振动，甚至于产生拍振。
Under the periodical loads, the shaft must have the torsional vibration, named "beat", because the shafting has not only inertia but also elasticity.
波浪荷载是海洋工程中一种重要的基本荷载，是海洋地基土受到最频繁的周期性动荷载。
Wave load is one of the important loads in ocean engineering, which is the most frequent load in the sand foundation of offing.
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