水下刚硬体声散射场计算及分析

针对水下任意形状刚硬体,建立了其声散射T矩阵法计算模型。利用物体的几何对称性,提出了各种简化计算Q矩阵的方法。以两端有半椭球顶的有限长圆柱体为例,分别计算了具有不同长宽比或者是不同端部几何形状的有限长圆柱体的反向散射和前向散射函数。深入讨论了有限长圆柱体的镜反射波和Franz波的干涉物理模型,以及其圆柱体中段长度对散射场的影响,并对得到的计算结果给出了合理的物理解释。计算结果同时也表明T矩阵法是一种很简便实用的计算水下物体远场散射的方法。

Computation and analysis of the acoustic scattering field from submerged rigid objects

A computational model of T-matrix method to calculate the acoustic scattering from the subm-erged rigid objects with arbitrary shapes is established. Making use of the geometric symmetry of the objects,many simplifying methods for calculations of Q matrix have been presented. The backscattering and forward sca-ttering functions of finite cylinders with hemispheroidal end caps,which have different ratio of length to width or different geometric end caps,were calculated. Physical interference model be-tween the specular reflection and Franz wave by finite cylinders,and the effect of the length of cylindrical portion on scattering field have been discussed further. Meanwhile a reasonable physical explanation on the obtained calculated results has been given. The calculated results also show that T-matrix method is an easy and practical method,which could be used to calculate the far field acoustic scattering from subm-erged objects.