为了研究水下沉积物介质参数波动对海底界面声波反射系数的影响规律，本文采用声学有限元与Biot多孔弹性波理论模型结合PML技术，首先利用COMSOL Multiphysics多物理场仿真分析软件建立2层理想流体的分层介质声场计算模型，并与解析解对比验证其正确性。而后使用多孔弹性介质模拟海底沉积物，建立水-多孔介质计算模型，得到的计算结果与参考文献很好的吻合。最后对多孔介质进行参数化仿真分析，计算不同频率与入射角下的声波反射系数，分析得到多孔介质孔隙率、流体密度以及固体颗粒密度的波动对声波反射系数的影响规律。
In order to study the influence of parameters fluctuation of underwater sediment medium on reflection coefficient of seafloor interface, this paper adopts acoustic finite element model and Biot porous elastic wave theory model combined with PML technology. Firstly, using COMSOL Multiphysics simulation and analysis software, the acoustic field calculation model of layered medium with two layers of ideal fluid is established. The correctness of the proposed solution is verified by comparing with the analytic solution. Then, the water-porous media model was established by using porous elastic media to simulate the seafloor sediments, and the calculated results were in good agreement with the references. Finally, a parametric simulation analysis was carried out on the porous media to calculate the acoustic reflection coefficient at different frequencies and incident angles, and the influence law of the fluctuation of parameters such as porosity of porous media, fluid density and solid density on the acoustic reflection coefficient was obtained.
2022,44(16): 126-129 收稿日期：2021-07-27
DOI：10.3404/j.issn.1672-7649.2022.16.026
分类号：P733.2
作者简介：龚昌鑫（1996 - ），男，硕士研究生，研究方向为船舶与海洋结构物振动与噪声分析、控制与优化
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