修正反射系数的Kirchhoff近似方法计算高斯起伏冰面三维声散射  

Calculation of three-dimensional acoustic scattering from Gaussian rough under-ice surface using the Kirchhoff approximation method with modified reflection coefficient

作　　者：陈文剑 郎鹏远[1,2,3] 胡思为 殷敬伟 孙辉 张宇翔[1,2,3] CHEN Wenjian;LANG Pengyuan;HU Siwei;YIN Jingwei;SUN Hui;ZHANG Yuxiaiig(Acoustic Science and Technology Laboratory,Harbin Engineering University Harbin 150001l;Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University),Ministry of Industry and Information Technology Harbin 150001;College of Underwater Acoustic Engineering,Harbin Engineering University Harbin 150001)

机构地区：[1]哈尔滨工程大学水声技术重点实验室,哈尔滨150001 [2]海洋信息获取与安全工信部重点实验室(哈尔滨工程大学),哈尔滨150001 [3]哈尔滨工程大学水声工程学院,哈尔滨150001

出　　处：《声学学报》2020年第4期449-457,共9页Acta Acustica

基　　金：国家重点研发计划项目(2018YFC1405900);国家自然科学基金重点项目(61631008)资助。

摘　　要：针对随机起伏冰面的声散射计算问题,利用修正反射系数的Kirchhoff近似方法计算了高斯起伏冰面的三维声散射。在计算模型中引入了冰面局部统计平均反射系数的概念,将二维高斯起伏冰面的散射分为相干散射和非相干散射,分别得到两类散射成分的散射系数公式,计算了高斯起伏冰面三维声散射的散射强度。分析了散射强度与随机起伏冰面的均方根高度、声波入射角度及频率的关系。通过实验室水池中高斯起伏冰面的散射强度测量实验,对理论模型的计算结果进行了验证。将实验结果分别与采用冰面局部统计平均反射系数的模型计算结果和文献中采用平整冰面镜反射系数的模型计算结果进行了对比,采用冰面局部统计平均反射系数的模型计算结果与实验测量值吻合较好。The Kirchhoff approximation method with modified reflection coeficient is used to calculate the threedimensional acoustic scattering of Gaussian rough under-ice surface.The concept of local statistical average reflection coefficient of under-ice surface is proposed in the calculation model.The scattering sound field of two-dimensional Gaussian rough under-ice surface is divided into coherent scattering and incoherent scattering.The scattering cross coefficient formulas of two kinds of scattering components are derived respectively,and the three-dimensional scattering intensity is obtained.The relationship between scattering intensity with RMS height of Gaussian rough under-ice surface,incidence angle and frequency of sound wave is analyzed.The scattering intensity of Gaussian rough under-ice surface is measured in the laboratory water tank,and the calculation results of the theoretical model are verified.The experimental results are compared with the theoretical calculation results of the local statistical average reflection coefficient of underice surface in this paper and the mirror reflection coefficient of under-ice surface in the literature.The calculated results of the local statistical average reflection coefficient are in good agreement with the experimental results.

关 键 词：Kirchhoff近似 反射系数 非相干散射 散射系数 散射强度 局部统计 声散射 入射角度 

分 类 号：TB56[交通运输工程—水声工程] P343.6[理学—物理]