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Low frequency finite element models of the acoustical behavior of earmuffs

Boyer, S. et Doutres, Olivier et Sgard, F. et Laville, Frédéric et Boutin, J.. 2015. « Low frequency finite element models of the acoustical behavior of earmuffs ». Journal of the Acoustical Society of America, vol. 137, nº 5. p. 2602-2613.

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Résumé

This paper compares different approaches to model the vibroacoustic behavior of earmuffs at low frequency and investigates their accuracy by comparison with objective insertion loss measurements recently carried out by Boyer et al. [(2014). Appl. Acoust. 83, 76–85]. Two models based on the finite element (FE) method where the cushion is either modeled as a spring foundation (SF) or as an equivalent solid (ES), and the well-known lumped parameters model (LPM) are investigated. Modeling results show that: (i) all modeling strategies are in good agreement with measurements, providing that the characterization of the cushion equivalent mechanical properties are performed with great care and as close as possible to in situ loading, boundary, and environmental conditions and that the frequency dependence of the mechanical properties is taken into account, (ii) the LPM is the most simple modeling strategy, but the air volume enclosed by the earmuff must be correctly estimated, which is not as straightforward as it may seem, (iii) similar results are obtained with the SF and the ES FE-models of the cushion, but the SF should be preferred to predict the earmuff acoustic response at low frequency since it requires less parameters and a less complex characterization procedure.

Type de document: Article publié dans une revue, révisé par les pairs
Professeur:
Professeur
Doutres, Olivier
Laville, Frédéric
Affiliation: Génie mécanique
Date de dépôt: 23 juin 2015 20:15
Dernière modification: 30 août 2017 16:13
URI: http://espace2.etsmtl.ca/id/eprint/9726

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