Article Dans Une Revue Applied Acoustics Année : 2024

Extremely tortuous sound absorbers with labyrinthine channels in non-porous and microporous solid skeletons

Résumé

An assembly of additively-manufactured modules to form two-dimensional networks of labyrinthine slits results in a sound absorber with extremely high tortuosity and thereby a relatively low-frequency quarter wavelength resonance. Fully analytical modelling is developed for the generic design of such composite acoustic panels, allowing rapid exploration of various specific designs. In addition to single-porosity panels, a double porosity case is also investigated, in which the skeleton of the composite is microporous with a permeability very much lower than that of the tortuous slit network. The analytical modelling is verified by various numerical calculations, as well as sound absorption measurements performed on several 3D printed samples of modular composite panels. The experimental validation required overcoming the nontrivial difficulties related to additive manufacturing and testing samples of extreme tortuosity. On the other hand, due to the substantial two-dimensionality and modularity of the proposed design, such absorbers can be manufactured by traditional methods suitable for mass production of large-surface panels. The experimental results fully confirmed the theoretical predictions that significant sound absorption, almost perfect at the peak, can be achieved at relatively low frequencies using very thin panels, especially those with double porosity.

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hal-04363476 , version 1 (25-12-2023)

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Tomasz G Zieliński, Kamil C Opiela, Nicolas Dauchez, Thomas Boutin, Marie-Annick Galland, et al.. Extremely tortuous sound absorbers with labyrinthine channels in non-porous and microporous solid skeletons. Applied Acoustics, 2024, 217, pp.109816. ⟨10.1016/j.apacoust.2023.109816⟩. ⟨hal-04363476⟩
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