有限长圆柱壳体声辐射特性影响因素研究

以水下简支薄壳为研究对象，对外力激励下有限长圆柱壳体声辐射特性的影响因素进行了研究.考虑有限长圆柱壳体与声场之间的互耦合，并讨论它们之间的互辐射阻抗对壳体的辐射声压级和表面振动均方速度级的影响，着重分析了壳体的纵横比以及材质对圆柱壳体声辐射特性的影响.数值计算结果表明,结构与声场之间的互辐射阻抗对壳体的辐射声压级有一定的影响，但是对表面振动均方速度级的影响很小；壳体厚度对声辐射特性的影响比长度对声辐射特性的影响更为明显；材质对声辐射特性的影响是不可忽略的因素.

Study on influencing factors for sound radiation characteristics of finite length cylindrical shells

The influencing factors for sound radiation characteristics of submerged simply-supported thin finite length cylindrical shells excited by external force were investigated.The coupling between the shells and the acoustic medium were taken into account and the radiation power and surface average velocity in conjunction with their interaction radiation impedance were discussed.The effects of shell's aspect ratio and material on the sound radiation were mainly considered.Numerical results show that the influence of coupling between structure and sound field is relatively large on the shell's sound radiation,but is neglectable on the shell's quadratic velocity.The effect of shell's thickness on sound radiation characteristics is more pronounced than that of shell's length under the same radius.Under the same condition the material has a non-negligible influence on sound radiation.