Perforated closed-cell metal foam for acoustic applications

Autor: Opiela, Kamil, Zielinski, Tomasz, Dvorak, Tomas, Jr., Stanislav Kudela
Přispěvatelé: Institute of Fundamental Technological Research (IPPT), Polska Akademia Nauk = Polish Academy of Sciences (PAN)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Forum Acusticum
Forum Acusticum, Dec 2020, Lyon, France. pp.2879-2886, ⟨10.48465/fa.2020.0925⟩
DOI: 10.48465/fa.2020.0925⟩
Popis: International audience; Despite very good mechanical and physical properties such as lightness, rigidity and high thermal conductivity, closed-porosity metal foams alone are usually poor acoustic treatments. However, relatively low production cost weights them in many applications in favor of their open-cell equivalents. In the present work, this attractive and popular material is subject to consideration from the point of view of the improvement of its sound absorption characteristics. A classic method of perforation is proposed to open the porous interior of the medium to the penetration of acoustic waves and therefore enhance dissipation of their energy. The interaction between perforation diameter and closed-cell microstructure as well as its impact on the overall sound absorption of a similar foam was already studied in 2010 by Chevillotte, Perrot and Panneton, so these topics are not discussed much in this work. On the other hand, the objective here is to investigate if one can efficiently approximate wave propagation phenomenon in real perforated heterogeneous materials with closed porosity of irregular shape by means of their simplified 3D representation at the micro-level. The applied multiscale modelling was confronted with measurements of sound absorption in an impedance tube. Moreover, as expected, numerical and experimental comparisons with perforated solid samples show great benefit coming from the presence of a porous structure in the foam, although it was initially closed.
Databáze: OpenAIRE
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