水下部分覆盖阻尼材料圆柱壳的声辐射性能

利用模态展开技术和Green函数法研究了部分敷设阻尼材料的有限长圆柱壳在流场中的声辐射特性。圆柱壳两端简支，并连有无限长的刚性圆柱障板；阻尼覆盖层用无质量的粘弹性弹簧模拟。在圆柱壳的模态运动方程中，外流场和阻尼覆盖层都会导致强烈的模态耦合效应。计算了圆柱壳表面的辐射声功率和辐射声压，讨论了阻尼覆盖层面积对声辐射的影响。结果表明圆柱壳部分覆盖阻尼层后，由于声漏效应，壳体声辐射与光壳相比会增强。

Sound Radiation from Submerged Cylindrical Shells, Partially Covered with Damping Layers

By using of modal expansion technique and Green's function method, the soun d rad iation characteristics of submerged finite cylindrical shells,which were partial ly covered with damping layers, were investigated in this paper. The cylindrical shell was simplysupported and terminated by infinite rigid cylindrical baffles at two ends , the damping layer is simulated by a mass less viscoelastic spring. In the shel l 's modal equations, exterior fluid medium and the damping layer lead to strong m odal coupling. The radiated power and acoustic pressure on the shell sur face are calculated, and the influence of the layer area on the shell's radiatio n is discussed. Numerical results showed that if the shell was partially covered wi th a damping layer, its sound radiation would be greater than that of the ba re shell due to leak effect.