Passive earplug including Helmholtz resonators arranged in series to achieve broadband near zero occlusion effect at low frequencies - Le Mans Université Accéder directement au contenu
Article Dans Une Revue Journal of the Acoustical Society of America Année : 2023

Passive earplug including Helmholtz resonators arranged in series to achieve broadband near zero occlusion effect at low frequencies

Résumé

The use of passive earplugs is often associated with the occlusion effect: a phenomenon described as the increased auditory perception of one's own physiological noise at low frequencies. As a notable acoustic discomfort, the occlusion effect penalizes the use and the efficiency of earplugs. This phenomenon is objectively characterized by the increase in sound pressure level in the occluded ear canal compared to the open ear canal. Taking inspiration from acoustic metamaterials, a new design of a three-dimensional printed “meta-earplug,” made of four Helmholtz resonators arranged in series, is proposed for achieving near zero objective occlusion effect measured on artificial ear in a broadband frequency range (300 Hz to 1 kHz). For this purpose, the geometry of the meta-earplug is optimized to achieve a null occlusion effect target based on an analytical model of the phenomenon. It results from the optimization process that the input impedance of the meta-earplug medial surface approximately matches the input impedance of the open ear canal, weighted by the ratio of volume velocity imposed by the ear canal wall to the ear canal cavity between open and occluded cases. Acoustic properties of the meta-earplug are also shown to significantly improve its sound attenuation at the piston-like mode of the system.
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Dates et versions

hal-04282480 , version 1 (13-11-2023)

Identifiants

Citer

Kévin Carillo, Franck Sgard, Olivier Dazel, Olivier Doutres. Passive earplug including Helmholtz resonators arranged in series to achieve broadband near zero occlusion effect at low frequencies. Journal of the Acoustical Society of America, 2023, 154 (4), pp.2099-2111. ⟨10.1121/10.0021185⟩. ⟨hal-04282480⟩
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