Acoustic properties of air-saturated porous materials containing dead-end porosity
Acoustic properties of air-saturated porous materials containing dead-end porosity
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DOI：
10.1063/1.3646556
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发表时间：
2011-11-01
影响因子：
3.2
通讯作者：
Panneton, R.
中科院分区：
文献类型：
--
作者：
Dupont, T.;Leclaire, P.;Panneton, R.
这项研究考察了具有复杂微几何结构的材料的声学特性，这些材料含有部分开放或死端(DE)的孔隙率。其中一种材料可以在水的帮助下溶解嵌入固体金属基质中的盐粒。在负压和高温下，液态金属侵入由盐粒形成的颗粒状物质后，金属冷却和凝固后，得到固体基质。理论和实验结果的比较表明，经典的Johnson-Champoux-Allard模型不能很准确地预测声学行为。这些结果表明，Biot理论的假设可能并不完全满足，材料中可能存在空腔谐振器和死胡同。研究的第一部分提出了一个简单的模型来解释这种几何结构。基于该模型，建立了两个声传递矩阵：一个用于非对称多孔单元，另一个用于对称死端多孔单元。认为该模型可以用来研究上述材料的吸声和透声特性。在第二部分中，提出了一系列简化的样本，并用三麦克风阻抗管进行了测试，以验证暴露的模型。最后，第三部分将暴露模型的预测结果与阻抗管在含有死端气孔的真实泡沫铝样品上的结果进行了比较。这些初步的结果是令人鼓舞的，并表明这个简单的模型也为这些具有更复杂微观结构的材料提供了一个很好的预测。(C)2011年美国物理研究所。[DOI：10.1063/1.3646556]
This study examines the acoustic properties of materials with complex micro-geometry containing partially open or dead-end (DE) porosity. One of these kinds of materials can be obtained from dissolving salt grains embedded in a solid metal matrix with the help of water. The solid matrix is obtained after the metal, in liquid form, has invaded the granular material formed by the salt particles at negative pressure and high temperature, and after cooling and solidification of the metal. Comparisons between theoretical and experimental results show that the classical Johnson-Champoux-Allard model does not quite accurately predict the acoustic behavior. These results suggest that the assumptions of the Biot theory may not all be fulfilled and that cavity resonators and dead ends can be present in the material. The first part of the study proposes a simple model to account for this geometry. Based upon this model, two acoustic transfer matrices are developed: one for non-symmetric and one for symmetric dead-end porous elements. It is thought that this model can be used to study the acoustic absorption and sound transmission properties of the type of material previously described. In the second part, a series of simplified samples are proposed and tested with a three-microphone impedance tube to validate the exposed model. Finally, the third part compares the predictions of the exposed model to the impedance tube results on a real aluminum foam sample containing dead-end pores. These first results are encouraging and show that this simple model also provides a good prediction for these materials with more complicated microstructure. (C) 2011 American Institute of Physics. [doi:10.1063/1.3646556]