| 海洋波导中目标声辐射场的计算方法 |
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| 引用本文： | 黄河,邹明松,蒋令闻.海洋波导中目标声辐射场的计算方法[J].声学学报,2019,44(6):1027-1035. |
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| 作者姓名： | 黄河 邹明松 蒋令闻 |
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| 作者单位： | 1. 中国船舶科学研究中心 无锡 214082; |
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| 基金项目： | 江苏省自然科学基金项目(BK20170216)国家自然科学基金项目(11772304,51709241)资助 |
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| 摘 要： | 针对海洋波导中目标声辐射场的计算问题,提出了一种基于波叠加法并在近、远场采用不同水声传播模型的建模方法,可以将近、远场作为一个统一的系统进行高效地分析。该方法通过给定的已知表面振动速度的结构计算出目标内部虚拟点声源的源强,再配合在相应的水声环境中点声源传播模型的Green函数计算出结构外的声辐射场。以Green函数为纽带,在求源强和计算近场声辐射场时采用镜像虚源法,而在计算远场声辐射场时采用简正波法。通过该方法得到的有限水深波导中声速剖面为正梯度、负梯度、负跃层的3种情况下的脉动球、刚体摆动球的声辐射场计算结果与COMSOL的有限元计算结果进行对比,结果表明了该方法在提高计算效率的同时保证了计算精度。
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| 关 键 词： | 海洋波导 声辐射场 波叠加法 声速剖面 |
| 收稿时间： | 2018-01-08 |
Computing method of sound radiation of target in ocean acoustic environment |
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| Affiliation: | 1. China Ship Scientific Research Center, Wuxi 214082;2. State Key Laboratory of Deep-sea Manned Vehicles, Wuxi 214082 |
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| Abstract: | A modeling method for computing of sound radiation of target in ocean acoustic environment is proposed based on wave superposition method,applying different underwater acoustic propagation models in near and far fields,which can analyze efficiently near and far fields as a unified system.With given surface velocity potential of target,virtual source strength within the target can be calculated.By using these source strength and the Green function which stands for sound propagation model of point source in the corresponding underwater environment,the acoustic radiation field outside the target can also be calculated,where image-source method is used to achieve source strength and acoustic radiation field in near field while normal-mode method is applied in far field.Through the calculation for acoustic radiation field of pulsatingsphereand oscillatingsphere in finite depth with positive velocity gradient,negative velocity gradient,and negative thermocline velocity gradient,the results will be compared with the finite element results from COMSOL software.This method is proved of the computational efficiency while it guarantees the precision of calculation. |
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