Dynamic vibration equation of drilling string is established based on the theory of dynamics.
根据动力学理论建立钻柱动力学振动方程。
The rule of lateral vibration under axial load was studied in theory, the inherent frequency of drilling string was obtained.
从理论上分析了轴向载荷存在的情况下钻柱横向自由振动的规律，获得了钻柱横向振动固有频率。
The vibration responses of floating drilling vessels in random sea waves are studied in this paper by using the theory of random vibrations.
应用随机振动理论，对浮动式钻井装置在随机海浪作用下的动力响应进行了分析。
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