复杂声边界约束下水中圆柱壳声振特性研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (21) : 186-193.

论文

复杂声边界约束下水中圆柱壳声振特性研究

翁凌霄1 缪宇跃2 李天匀3

作者信息 +

Acoustic and vibration characteristics of underwater cylindrical shell with complex acoustic boundaries

WENG Lingxiao1 MIAO Yuyue2 LI Tianyun3

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文章历史 +

摘要

解析地研究了复杂声边界约束下水中无限长圆柱壳的振动和声辐射问题。该圆柱壳受到轴向均匀线激励力作用，并处于自由液面（或水平水底）和垂直刚性壁面组成的复杂声边界构成的四分之一无限流域中。根据镜像原理和Graf加法定理推导了无限长圆柱壳声振耦合方程，讨论了复杂声边界对圆柱壳振动和声辐射的影响。研究发现两种声边界对圆柱壳振动特性和表面辐射声功率有不同的影响。当圆柱壳离边界足够远时其振动特性和表面辐射声功率几乎不受影响，而其辐射声场仍会受到圆柱壳位置变化的影响，尤其当圆柱壳靠近流域边界时会产生显著的辐射噪声，不利于隐蔽。

Abstract

Vibration and acoustic radiation of an infinite long underwater cylindrical shell with complex acoustic boundary conditions were studied analytically.The cylindrical shell was excited by an axial uniform line load and located in a quarter-infinite flow domain with complex acoustic boundary conditions composed of a free liquid surface or horizontal water bottom and a vertical rigid wall one.Based on the mirror image principle and Graf’s addition theorem, the sound-vibration coupled dynamic equation of the infinite cylindrical shell was derived to discuss effects of complex acoustic boundary conditions on the shell’s vibration and acoustic radiation.It was shown that free liquid surface and rigid wall one have different effects on the shell’s vibration characteristics and surface radiation acoustic power, respectively; when the shell is enough far away from the boundary, its vibration characteristics and surface radiation acoustic power almost are not affected, while its radiation sound field is still affected by its position variation, especially, when the shell is closed to the flow domain boundary，significant radiation noise is produced, it is not conducive to concealment.

导出引用

翁凌霄1 缪宇跃2 李天匀3. 复杂声边界约束下水中圆柱壳声振特性研究[J]. 振动与冲击, 2019, 38(21): 186-193

WENG Lingxiao1 MIAO Yuyue2 LI Tianyun3. Acoustic and vibration characteristics of underwater cylindrical shell with complex acoustic boundaries[J]. Journal of Vibration and Shock, 2019, 38(21): 186-193

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