刚性球的散射方向性图仿真研究  

Simulation and analysis of acoustic scattering chart of rigid sphere

作　　者：徐忠昌[1] 张明敏[2] 

机构地区：[1]海军工程大学理学院,武汉430033 [2]海军工程大学电子工程学院,武汉430033

出　　处：《海军工程大学学报》2012年第6期65-69,共5页Journal of Naval University of Engineering

摘　　要：利用基于奇异值提取技术的高斯积分技巧,并引进局部坐标系与合适的坐标变换,将奇异积分的计算转化为在局部坐标系内的积分面元上计算沿边界的曲线积分,最终给出了奇异积分与近似奇异积分的数值计算公式,从而实现了Helmholtz表面积分方程积分解的数值计算。对刚性球的仿真结果表明:该方法给出的目标散射方向性图与国外类似文献吻合得较好,可用于双基地声纳、目标低频声散射特性等相关研究。By means of Gaussian integral, a new method is proposed to deal with singular integrals and approximate singular integrals according to the singularity extraction technique. The introduction of a local coordinate system and the adoption of coordinate transformation can convert the calculated singular surface integral into a regular curvilinear integral to obtain the numerical formulae of singular integrals. Through simulation, the direction charts of acoustic scattering at different wave radii are plot- ted, which agrees well with those in foreign literature of a kind. The results demonstrate that the proposed new method can he used for the research on bistatic sonar and the prediction of echo characteristics of complicated objects at low frequencies.

关 键 词：声散射 奇异积分 刚性球 散射方向性图 

分 类 号：O427.2[理学—声学]