string vibration theory 弦振动理论 two dimensionally reduced string effective theory in somerestricted backgrounds 限定背景中两维约化弦有效理论 ..
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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。
Based on theory of vibration mechanics, this paper analyzes the vibration mechanics model of rod string systematically.
从振动力学的理论出发，对现行抽油杆柱的振动力学模型进行了系统分析。
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