水中有限长纵向加肋圆柱壳体振动与声辐射影响因素研究

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振动与冲击 ›› 2009, Vol. 28 ›› Issue (5) : 74-79,8.

论文

水中有限长纵向加肋圆柱壳体振动与声辐射影响因素研究

廖长江 1, 2 蒋伟康1 王云2 段浩2

作者信息 +

Vibration and Acoustic Radiation from Axially Stiffened Finite Cylindrical Shells in Water

LIAO Chang-Jiang1, 2, JIANG Wei-Kang1, WANG Yun2, DUAN Hao2

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文章历史 +

摘要

本文以水中有限长纵向加肋圆柱壳体为研究对象，推导了水中有限长纵向加肋圆柱壳体的声固耦合振动方程，其中纵向肋骨的作用表现为在基本圆柱壳体声固耦合振动方程中增加相应的附加阻抗，因此壳体的振动和声辐射由壳体机械阻抗、辐射阻抗和纵向肋骨附加阻抗决定。通过数值仿真算例对外力激励下有限长纵向加肋圆柱壳体振动与声辐射影响因素进行了研究。结果表明纵向加肋对水中圆柱壳体的辐射声功率影响不大，但壳体表面平均振动速度明显降低，而材料损耗因子对几乎所有频段内水中圆柱壳体的辐射声功率和表面平均振动速度都有明显抑制作用。

Abstract

The coupled vibration equation of axially stiffened finite cylindrical shell is derived, in this equation additional impedance caused by the axial stiffeners is added to the coupled vibration equation. As a result, the vibration and sound radiation of shell depend on the mechanical impedance of shell, the radiation sound impedance and the additional impedance. Based on the numerical simulation, the influencing factors for sound radiation characteristics of submerged simply-supported thin finite length cylindrical shells excited by external force were investigated. It is found that the axial stiffener number just has a slight influence on radiated sound power, whereas structural damping has a great influence on radiated power and radial quadratic velocity on the surface of shell. This study can give some guidelines for noise reduction of this kind of shell.

导出引用

廖长江; 蒋伟康王云段浩. 水中有限长纵向加肋圆柱壳体振动与声辐射影响因素研究[J]. 振动与冲击, 2009, 28(5): 74-79,8

LIAO Chang-Jiang;;JIANG Wei-Kang;WANG Yun;DUAN Hao. Vibration and Acoustic Radiation from Axially Stiffened Finite Cylindrical Shells in Water[J]. Journal of Vibration and Shock, 2009, 28(5): 74-79,8

中图分类号： TB532