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Numerical modeling of the vibro-acoustic behavior of an artificial ear dedicated to the study of hearing protectors

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Benacchio, S., Doutres, O. et Sgard, F.. 2020. « Numerical modeling of the vibro-acoustic behavior of an artificial ear dedicated to the study of hearing protectors ». Communication lors de la conférence : e-Forum Acusticum (En ligne, Dec. 07-11, 2020).

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Abstract

Hearing protection devices like earplugs are largely used to protect workers against noise. The discomfort related to the use of earplugs is known to reduce their effectiveness. Since this discomfort remains difficult to evaluate, it seems necessary to improve current tools like acoustical test fixtures to help earplug manufacturers to design more comfortable devices. In this perspective, a numerical model of an artificial ear based on the finite element method is proposed. This model aims to investigate the important features needed to correctly evaluate objective indicators related to the acoustical comfort of earplugs using an artificial ear. In the present preliminary study, the ability of this numerical model to simulate the insertion loss of earplugs is tested by comparing sound pressure level transfer functions computed in both the open and occluded numerical earcanal with experimental data measured on the corresponding physical artificial ear. Results reveal that the proposed numerical model simulates well the sound pressure level in an open earcanal but fails in the occluded case above 400 Hz. Possible sources of discrepancies are investigated. In particular, the effect of various model parameters on the acoustic response in the earcanal is evaluated.

Item Type: Communication (Communication)
Additional Information: Le résumé est diponible sur le site de la conférence https://www.conforg.fr/bin/time_table?dir=fa2020&day=5
Professor:
Professor
Doutres, Olivier
Affiliation: Génie mécanique
Date Deposited: 08 Jan 2021 20:52
Last Modified: 14 Jan 2021 17:04
URI: https://espace2.etsmtl.ca/id/eprint/21983

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