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