以位移模型为基础，用有限元中的分离变量法的理论，求解了圆柱壳自由振动的固有频率，计算结果与壳体解析解相一致。
This paper calculate inherent frequency of the free vibration of the cylinder shell with the theory of the separated variable method on the basis of displacement model.
研究结果表明：自由液面和刚性壁面对结构的固有频率、振动响应及声辐射的影响是不容忽视的。
The results of this research show that the impact of the soft surface and the hard plane on the structural natural frequencies, vibration responses and the acoustic radiation cannot be ignored.
建立刚性悬挂接触网的自由振动有限元模型，计算其固有频率和振型。
The finite element model of the free vibration for the rigid suspension catenary and pantograph is set up.
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 rule of lateral vibration under axial load was studied in theory, the inherent frequency of drilling string was obtained.
本文提出多自由度振动系统固有频率的一种近似解法。
A new approximate solution is given in this paper to estimate the fundamental frequency of vibration system with multiple freedom degree.
本文提出多自由度振动系统固有频率的一种近似解法。
A new approximate solution is given in this paper to estimate the fundamental frequency of vibration system with multiple freedom degree.
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