敷设空腔覆盖层的水下弹性球壳散射特性

研究敷设空腔覆盖层的水下弹性球壳声散射特性对探测和识别水下目标具有重要意义。利用 COMSOL有限元软件对水下弹性球进行仿真,获得目标强度的数值解,通过与理论解对比验证了该方法可用于计算水下球形结构的声散射特性。通过对弹性球壳敷设覆盖层前后的目标强度进行仿真,对比结果指出敷设空腔覆盖层能有效降低球壳的目标强度。进一步讨论覆盖层材料参数和空腔结构变化对弹性球壳声散射特性的影响,结果表明：空腔比、覆盖层厚度和损耗因子值越大,目标强度越小;与圆柱、圆台空腔相比,圆锥空腔的目标强度最低。

Study on acoustic scattering characteristics of underwater elastic spherical shelis covered by cavity

Researching the acoustic scattering characteristics of underwater elastic spherical shell with cavity cover is of great significance to detecting and identifying underwater targets. The numerical solution of the target strength of underwater elastic sphere is simulated by COMSOL finite element software, and the comparison with the theoretical solution verifies that the method can be used to calculate the acoustic scattering characteristics of underwater spherical structures. Through the simulation of the target strength before and after the covering of the elastic spherical shell, the comparison results indicate that laying the cavity covering can effectively reduce the target strength of the spherical shell. Furthermore, the influence of the material parameters of the cover layer and the changes in the cavity structure on the sound scattering characteristics of the elastic spherical shell is discussed. The results show that: the larger the cavity ratio, the thickness of the cover layer and the loss factor, the smaller the target strength; comparing with cylindrical and circular cavity, the conical cavity has the lowest target intensity; the target strength varies with young"s modulus in different frequency range.