Using the second order perturbation theory, the formulae of vibrational force constants are derived in part one.
运用二阶微扰理论，本文第一部分首先计算了高阶力常数的表达式。
Under the excitation of harmonic force the vibrational power flow characteristics of plate with a surface crack are investigated from the view of structure-borne sound.
从结构噪声的观点研究了在简谐力作用下含有表面裂纹板的振动功率流特性。
Employed wave propagation approach, the vibrational power flow of a submerged infinite cylindrical shell coated with unconstrained viscoelastic layer excited by a radical harmonic force is studied.
采用波传播分析方法，讨论了外部敷设粘弹性自由阻尼材料的无限长圆柱壳在流场中受径向简谐激励的振动功率流。
A model of periodic ring-stiffened cylindrical shell was designed, and the experiment on the vibrational power flow from the model excited by an outer force was accomplished.
设计了周期加肋圆柱壳结构模型，对加肋圆柱壳受激振动的能量流进行了实验研究。
The generalized aerodynamic force required in analysis is calculated by using horse shoe vortex— vibrational pressure doublet grid method, based on theory of subsonic unsteady lifting plane.
在颤振特性分析中所需要的广义气动力是根据亚音速非定常升力面理论，采用马蹄涡—振荡压力偶极子格网法计算的。
The vibrational energy is obviously enlarged, the effective amplitude is obviously increased, and the working force moment is obviously increased.
振动能量明显增大，有效振幅明显增加，工作力矩明显增加。
The vibrational energy is obviously enlarged, the effective amplitude is obviously increased, and the working force moment is obviously increased.
振动能量明显增大，有效振幅明显增加，工作力矩明显增加。
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