Article Dans Une Revue npj Acoustics Année : 2025

Sierpiński carpet-inspired hierarchical patterning of porous materials for sound absorption

Résumé

Efficient sound absorption at low and mid frequencies is essential for mitigating anthropogenic noise but remains a scientific and engineering challenge. While porous materials are effective at medium and high frequencies, they typically require considerable thickness to absorb low-frequency sound. Inspired by the Sierpiński carpet, we propose a hierarchical pattern of through-thickness holes in porous materials to enhance low-and mid-frequency absorption. Numerical simulations and impedance tube measurements demonstrate significant performance gains (up to a 46% of improvement in absorption at 500 Hz using 10% less material for a thickness of 80 mm). This enhancement is attributed to the presence of small-scale geometric features that spatially localize the acoustic pressure field, increasing energy dissipation within the porous medium. This hierarchical approach holds promise for developing lightweight, high-performance panels for sound insulation applications, particularly where improved low-and mid-frequency absorption is required without increasing material bulk.

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hal-05393314 , version 1 (02-12-2025)

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S. Kuznetsova, F. Allein, V.F. Dal Poggetto, F-X Bécot, M Miniaci. Sierpiński carpet-inspired hierarchical patterning of porous materials for sound absorption. npj Acoustics, 2025, 1, pp.25. ⟨10.1038/s44384-025-00023-8⟩. ⟨hal-05393314⟩
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