舰艇内铺板到壳体结构振动传递损耗研究

摘要

The vibrational transmission loss from flooring to shell is an important parameter of quantitative acoustic design for warships. Based on the theory of fluid-structure interaction, Fourier transformation and contour integration are applied to obtain the formula for elastic wave attenuation. In consideration of the wave scattering at the joint of flooring and shell, a convenient formula is derived from the viewpoint of energy. The compute results agree well with the test data, which testifies that this method can give technical support for computation of underwater noise.%舰艇内铺板到船体结构的振动传递损耗是舰艇定量声学设计的重要参数.文章应用流固耦合理论,采用Fourier变换和围道积分技术求解得到弹性波衰减计算公式,然后分析了实船弹性波通过铺板到壳体连接接头的声散射特性,从能量观点推导出振动传递损耗简便的计算方法.理论计算结果与实船测试数据吻合较好,可为计算水下噪声提供技术支撑.