宽吻海豚声散射特性研究  

Study on the sound scattering characteristics of bottlenose dolphin

作　　者：莫晴舒 张培珍 刘欢 沈晨 李高聪 MO Qingshu;ZHANG Peizhen;LIU Huan;SHEN Chen;LI Gaocong(School of Electronics and Information Engineering,Guangdong Ocean University,Marine Remote Sensing and Information Technology Laboratory,Zhanjiang 524088,Guangdong,China)

机构地区：[1]广东海洋大学电子与信息工程学院,海洋遥感与信息技术实验室,广东湛江524088

出　　处：《声学技术》2023年第6期741-748,共8页Technical Acoustics

基　　金：国家自然科学基金项目(11974084);广东海洋大学研究生教育创新计划项目(040205112101);湛江市创新创业团队引育领航计划项目(211207157080994);国防基础科研计划实验室稳定支持专题资助项目(JCKYS2021604SSJS008)。

摘　　要：基于COMSOL多物理场仿真平台构建宽吻海豚3D模型,利用有限元数值方法计算在频率为1~5 kHz的调频信号照射条件下,海豚收发合置散射指向特性。结果表明:(1)由海豚模型0°~360°全向目标强度概率分布可知,其目标强度主要分布在-36.4~-11.2 dB;(2)肺部模型和海豚模型的频率响应特性具有较高的相似性,肺部是海豚总体声散射的主要贡献;(3)海豚频率响应在1.2、1.9、2.9、3.7 kHz附近,在4.3 kHz和4.8 kHz频率处出现较窄的共振模态谷值,验证生物组织介质中存在Whispering-Gallery波;(4)当频率为5 kHz时,海豚(肌体+肺部)的目标强度指向分布呈现“蝶形”,正横方向目标强度为-22.3 dB,头部方向目标强度为-34.2 dB,尾部目标强度为-34.3 dB。通过缩比海豚模型的水池回声测试实验,验证了数值计算的正确性。A 3D model of Bottlenose dolphin is constructed based on the COMSOL Multiphysics platform.The scattering directional characteristics of dolphin in transceiver testing system are calculated by finite element method under the irradiation of the LFM signal of 1 kHz to 5 kHz.The results show that:(1)The probability distribution of omni-directional target strength(TS)of the dolphin model from 0°to 360°can be known,and the TS values are mainly distributed in the range of−36.4 dB to−11.2 dB;(2)The frequency response of the lung model is similar to that of the dolphin model.The lung is the main contribution of the total acoustic scattering of the dolphin.(3)The frequency response of dolphin is shown around 1.2 kHz,1.9 kHz,2.9 kHz,3.7 kHz,with relatively narrow resonance mode valley values at 4.3 kHz,4.8 kHz,which verifies the existence of Whispering Gallery waves in biological tissue media.(4)The TS distribution of the dolphin also presents a"butterfly"shape at 5 kHz,the TS values are−22.3 dB in the abeam direction,−34.2 dB in the head direction,and−34.3 dB in the tail direction.(5)The accuracy of the numerical calculation is verified by the echo test experiment of the small scaled dolphin model in pool.

关 键 词：散射指向分布 频率-角度谱 COMSOL多物理仿真 海豚 目标强度 

分 类 号：O427.2[理学—声学]