A new method for assimilating a frequency-dependent drag coefficient into time-domain acoustic simulations is presented. The method combines structural (wave propagation) simulations together with acoustic attenuation of the individual frequencies through a model for the frequency-dependent drag coefficient. An incident pressure pulse is obtained experimentally or from a preliminary finite element simulation. This pulse is then decomposed into its spectral components. The propagation of each frequency component is simulated separately with the appropriate drag coefficient. In the final stage, the nodal pressure for all single frequency simulations are summed to reconstruct the transmitted attenuated pressure pulse. This method is demonstrated using a previously calibrated spectral model of the attenuation of methyl cellulose hydrogel, but it can be used for any other damping material for which a frequency response function can be obtained.

中文翻译：

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通过频率相关声阻力模拟水凝胶中的冲击衰减


提出了一种将频率相关阻力系数同化到时域声学仿真中的新方法。该方法通过频率相关阻力系数模型将结构（波传播）仿真与各个频率的声衰减相结合。入射压力脉冲是通过实验或初步有限元模拟获得的。然后，该脉冲被分解为其频谱分量。每个频率分量的传播都使用适当的阻力系数单独模拟。在最后阶段，将所有单频仿真的节点压力相加，以重建传输的衰减压力脉冲。该方法使用先前校准的甲基纤维素水凝胶衰减光谱模型进行了演示，但它可用于可以获得频率响应函数的任何其他阻尼材料。