波谱元法在颗粒介质中传播的数值与实验研究

K. Mizuno, P. Cristini, D. Komatitsch, Y. Capdeville
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引用次数: 0

摘要

不同工作频率的声学系统通常用于探测海洋沉积物中的物体。然而,声波在沉积物中的传播通常比在水中复杂得多,因为沉积物通常是由固体和流体部分组成的粒状介质。这使得对信号的理解变得更加困难,工程师们不得不依靠一种反复尝试的方法来设计新的海底设备,这导致海洋调查的总成本增加。因此,需要更好地理解波在颗粒介质中的传播以及用于预测埋藏物体反射信号的数值模型。在本研究中,我们将基于谱元方法的预测工具用于模拟后向散射信号,并将其与在装满水的水箱中获得的实验结果进行比较,并将其与具有宽范围晶粒尺寸与波长比的校准玻璃珠进行比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical and experimental study on wave propagation in granular media using a spectral-element method
Acoustic systems with various operating frequencies are commonly used for the detection of objects buried in the marine sediments. However, the propagation of acoustic waves in sediments is generally much more complicated than in water because sediments are, in general, granular media composed of solid and fluid parts. It makes the understanding of signals more difficult and engineers have to rely on a cut-and-try method for the design of the new sub-bottom devices which results in an increase of the total cost of sea surveys. Therefore, a better understanding of wave propagation in the granular media and of the numerical model used for the prediction of reflected signals from buried objects is required. In the present study, we evaluate the performances of the prediction tools based on the spectral element method for the simulation of backscattered signals by comparing them to experimental results obtained in a tank filled with water and calibrated glass beads having a wide range of ratio of the grain size to the wavelength.
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