Time-Domain Numerical Investigation to Assess Noise Reduction Allowed by a Non-Linear Passive Earplug Facing Impulse Noises.

Authors

  • Christophe Ruzyla Department Acoustics and Soldier Protection, French-German Research Institute of Saint-Louis, 68300 Saint-Louis, France.Laboratoire Interdisciplinaire Carnot de Bourgogne, site UTBM, UMR 6303 CNRS / Univ. Bourgogne Franche-Comté, France, FR
  • Pascal Hamery Department Acoustics and Soldier Protection, French-German Research Institute of Saint-Louis, 68300 Saint-Louis, France, FR
  • Cyril Blondé-Weinmann Laboratoire Interdisciplinaire Carnot de Bourgogne, site UTBM, UMR 6303 CNRS / Univ. Bourgogne Franche-Comté, France, FR
  • Sébastien Roth Department Acoustics and Soldier Protection, French-German Research Institute of Saint-Louis, 68300 Saint-Louis, France, FR

Abstract

To protect the hearing against high-level impulse noises, non-linear passive earplugs (NLPE) might be employed. Unlike conventional passive protectors, these devices provide an increasing peak amplitude attenuation with the impulse noise level thanks to filters made of one or more small orifices. To evaluate these protectors’ performances, empirical studies were previously conducted using acoustic test fixtures. However, these evaluations required a specific and expensive protocol. Thus, a new approach based on the Finite Element Method (FEM) was used to model a NLPE inserted in the ear canal and facing a 130 dB-peak and a 150 dB-peak impulse wave. The FEM model acoustic pressure in the ear canal corroborates the pressure evaluated experimentally. This approach provides a promising avenue for further optimization of these hearing protectors, while limiting the high cost of experimental evaluations.

Additional Files

Published

2023-10-09

How to Cite

1.
Ruzyla C, Hamery P, Blondé-Weinmann C, Roth S. Time-Domain Numerical Investigation to Assess Noise Reduction Allowed by a Non-Linear Passive Earplug Facing Impulse Noises. Canadian Acoustics [Internet]. 2023 Oct. 9 [cited 2024 Apr. 14];51(3):108-9. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/4063

Issue

Section

Proceedings of the Acoustics Week in Canada