圆锥壳和圆柱壳声辐射模态特性比较

单层加筋圆锥壳和圆柱壳是舰艇结构中最常见的结构,其噪声的辐射也受到广泛关注.本文以有限元法和边界元法为基础,在中、低频段研究比较了水中单层加筋圆锥壳和圆柱壳声辐射模态特性.对于相同尺寸的圆锥壳和圆柱壳而言,圆锥壳前10阶模态占主导时的频率f0高于圆柱壳的f0,并且辐射效率随着阶数的衰减要比圆柱壳的衰减快；圆锥壳的辐射效率总体高于圆柱壳的辐射效率；圆锥壳和圆柱壳的声辐射模态振速分布有着相同的规律,为振动噪声的主动控制提供了一些参考.

Comparison of acoustic modes characteristics for conical shell and cylindrical shell

Single-layer reinforced conical shell and cylindrical shell are the most common structure in ships,with its noise radiation widely concerned.This article has studied and compared acoustic modes for single-layer reinforced conical shell and cylindrical shell within middle-low frequency in water,based on FEM and BEM.With the same size,conical shell’s frequency f0 at which the first 10 order acoustic modes in change is higher than cylindrical shell’s,and radiation efficiency’s attenuation of conical shell all along the order is faster than cylindrical shell’s;conical shell’s radiation efficiency is generally higher than cylindrical shell’s;conical shell and cylindrical shell has the same acoustic modes shape,which gives some reference for the active control of vibration and noise.