Development of an equivalent solid model to predict the vibroacoustic behaviour of earmuff cushions

Authors

  • Sylvain Boyer Dept. Génie Mécanique, École de Technologie Supérieure (ÉTS), 1100 rue Notre-Dame Ouest, Montréal, QC H3C 1K3, Canada
  • Franck Sgard Institut de Recherche Robert-Sauve en Sante et Securite au Travail (IRSST), 505 Boul. de Maisonneuve Ouest, Montréal, QC H3A 3C2, Canada
  • Frédéric Laville Dept. Génie Mécanique, École de Technologie Supérieure (ÉTS), 1100 rue Notre-Dame Ouest, Montréal, QC H3C 1K3, Canada

Keywords:

Architectural acoustics, Porous materials, Air bubbles, Cyanoacrylates, Metal blocks, Solid model, Sound transmission, Vibration experiment, Vibro-acoustic behaviour, Visco-elastic

Abstract

A study that examines the relevance of using an equivalent isotropic visco-elastic solid model to capture the sound transmission law of an annular cushion from a commercial earmuff is presented. Ten cushions from a hygienic spare set are studied. They are mounted on a shaker and submitted to the weight of three metal blocks with masses of 1.15kg, 1.65kg and 2.13 kg, representing the force applied by the head band when the earmuffs are positioned on the head. Holes are glued with cyanoacrylate glue, when each cushion was under compression, to evacuate air from it. Vibration experiments were conducted and then cushions were immerged into water to make sure that apertures were completely occluded. Such verification has demonstrated that the sheath is a micro-porous material: micro air bubbles appear around the sheath when cushion are pressed. The foam and the sheath are tested separately under a mass of 0.65kg and compared to a cushion.

Downloads

Published

2011-09-01

How to Cite

1.
Boyer S, Sgard F, Laville F. Development of an equivalent solid model to predict the vibroacoustic behaviour of earmuff cushions. Canadian Acoustics [Internet]. 2011 Sep. 1 [cited 2023 Oct. 2];39(3):96-7. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2428

Issue

Vol. 39 No. 3 (2011)

Section

Proceedings of the Acoustics Week in Canada

License

Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i)    to publish, reproduce, distribute, display and store the Contribution;
ii)    to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii)    to exploit all subsidiary rights in the Contribution,
iv)    to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v)    to licence any third party to do any or all of the above.

Most read articles by the same author(s)

1 2 3 > >>