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基于Greenberg方法推导了含有阻抗边界条件的浅水Green函数,利用边界元法研究了含阻抗的三维海洋波导与散射体相互作用的问题。分析了海底阻抗对声波与结构体相互作用时的散射特性影响,数值分析表明:含有阻抗边界条件的浅海目标的散射特性与理想海底明显不同,海底阻抗对水平断面以及垂直断面的散射场都有一定的影响,目标距离海底越近,场点散射声压受海底边界条件的影响越大;阻抗越大,散射声压越大。指向性的分布对受海底阻抗的大小比较敏感。分析浅海声散射时,海底阻抗的影响不可忽视。
Based on the Greenberg method, a shallow water Green function with impedance boundary conditions is deduced. The boundary element method is used to study the interaction between impedance ocean waveguides and scatterers. The influence of the seafloor impedance on the scattering characteristics of the acoustic wave and the structural body is analyzed. Numerical analysis shows that the scattering characteristics of the shallow sea target containing the impedance boundary condition are obviously different from those of the ideal seafloor. The impedance of the seafloor impedance to both horizontal and vertical cross-sections has The closer the target is to the sea floor, the greater the acoustic pressure of field scattering is affected by the seafloor boundary conditions. The larger the impedance is, the larger the sound pressure is. The directivity distribution is sensitive to the size of the seafloor impedance. When analyzing shallow-sea acoustic scattering, the influence of seafloor impedance can not be neglected.