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Article Dans Une Revue Nature Communications Année : 2023

Frozen sound: An ultra-low frequency and ultra-broadband non-reciprocal acoustic absorber

Anis Maddi
Come Olivier
  • Fonction : Auteur
Guillaume Penelet
  • Fonction : Auteur

Résumé

Abstract The absorption of airborne sound is still a subject of active research, and even more since the emergence of acoustic metamaterials. Although being subwavelength, the screen barriers developed so far cannot absorb more than 50% of an incident wave at very low frequencies (<100 Hz). Here, we explore the design of a subwavelength and broadband absorbing screen based on thermoacoustic energy conversion. The system consists of a porous layer kept at room temperature on one side while the other side is cooled down to a very low temperature using liquid nitrogen. At the absorbing screen, the sound wave experiences both a pressure jump caused by viscous drag, and a velocity jump caused by thermoacoustic energy conversion breaking reciprocity and allowing a one-sided absorption up to 95 % even in the infrasound regime. By overcoming the ordinary low frequency absorption limit, thermoacoustic effects open the door to the design of innovative devices.

Dates et versions

hal-04249231 , version 1 (19-10-2023)

Identifiants

Citer

Anis Maddi, Come Olivier, Gaelle Poignand, Guillaume Penelet, Vincent Pagneux, et al.. Frozen sound: An ultra-low frequency and ultra-broadband non-reciprocal acoustic absorber. Nature Communications, 2023, 14 (1), pp.4028. ⟨10.1038/s41467-023-39727-4⟩. ⟨hal-04249231⟩
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