Journal
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Volume 137, Issue 1, Pages 273-280Publisher
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.4904534
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Funding
- ANR Project METAUDIBLE [ANR-13-BS09-0003]
- Agence Nationale de la Recherche (ANR) [ANR-13-BS09-0003] Funding Source: Agence Nationale de la Recherche (ANR)
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This paper studies the acoustical properties of hard-backed porous layers with periodically embedded air filled Helmholtz resonators. It is demonstrated that some enhancements in the acoustic absorption coefficient can be achieved in the viscous and inertial regimes at wavelengths much larger than the layer thickness. This enhancement is attributed to the excitation of two specific modes: Helmholtz resonance in the viscous regime and a trapped mode in the inertial regime. The enhancement in the absorption that is attributed to the Helmholtz resonance can be further improved when a small amount of porous material is removed from the resonator necks. In this way the frequency range in which these porous materials exhibit high values of the absorption coefficient can be extended by using Helmholtz resonators with a range of carefully tuned neck lengths. (C) 2015 Acoustical Society of America.
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