流场中周期加肋圆柱壳振动能量流的实验研究

Experimental investigation on vibrational power flow from a ring-stiffened cylindrical shell immersed in flow field

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。分别对空气中和水下的周期加肋圆柱壳受外激励的输入能量流进行了测量,发现由于外流场的影响,水下输入能量流值总体要比空气中输入能量流值稍低,在频率相对较低时,理论结果和实验结果较为吻合,随着频率增高,由于杨氏模量和阻尼因子的变化,理论结果稍偏大。验证了理论推导和计算方法的正确性,可为此类结构的减振降噪设计提供参考。

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.The input power flow was measured both in the air and underwater.It is found that the results underwater are slightly less than those in the air because of the influence of the outer flow field.The results obtained by experiment well agree with those produced by theoretical values at low frequencies. With the increasing of frequencies,theoretical values become slightly greater than experiment values due to the change of Young＇ modulus and damping factor. The results obtained by experiment show the validity of theoretical derivation and numerical method,which will provide some references on control of vibration and noise in such structures.