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Perforated closed-cell aluminium foam for acoustic absorption
Applied Acoustics ( IF 3.4 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.apacoust.2020.107706
Kamil C. Opiela , Tomasz G. Zieliński , Tomáš Dvorák , Stanislav Kúdela Jr.

Abstract Closed-cell metal foams are lightweight and durable materials resistant to high temperature and harsh conditions, but due to their fully closed porosity they are poor airborne sound absorbers. In this paper a classic method of drilling is used for a nearly closed-cell aluminium foam to open its porous interior to the penetration of acoustic waves propagating in air, thereby increasing the wave energy dissipation inside the pores of the perforated medium. The aim is to investigate whether it is possible to effectively approximate wave propagation and attenuation in industrial perforated heterogeneous materials with originally closed porosity of irregular shape by means of their simplified microstructural representation based on computer tomography scans. The applied multi-scale modelling of sound absorption in foam samples is confronted with impedance tube measurements. Moreover, the collected numerical and experimental data is compared with the corresponding results obtained for perforated solid samples to demonstrate a great benefit coming from the presence of an initially closed porous structure in the foam.

中文翻译:

用于吸声的穿孔闭孔泡沫铝

摘要 闭孔金属泡沫是一种轻质耐用的材料,耐高温和恶劣条件,但由于其完全封闭的孔隙率,它们是较差的空气吸声器。在本文中,一种经典的钻孔方法用于几乎闭孔的泡沫铝,打开其多孔内部,让在空气中传播的声波穿透,从而增加多孔介质孔内的波能耗散。目的是通过基于计算机断层扫描的简化微观结构表示,研究是否可以有效地近似波在工业穿孔异质材料中的波传播和衰减,这些材料最初具有不规则形状的封闭孔隙。泡沫样品中吸声的应用多尺度建模面临着阻抗管测量。此外,收集的数值和实验数据与穿孔固体样品获得的相应结果进行了比较,以证明泡沫中最初封闭多孔结构的存在带来的巨大好处。
更新日期:2021-03-01
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