Development of a simplified axi-symmetric finite element model of the auditory canal occluded by an earplug: Variability of the attenuation as a function of the input parameters

Guilhem Viallet, Franck Sgard, Frédéric Laville

Abstract


A common solution to prevent the problem of hearing loss due to noise exposure consists in using hearing protection devices (HPD) like earplugs (EP) or earmuffs. The first step is to implement and to validate the simplified axi-symmetric model and to extend this model for a more realistic boundary condition for the EP. The second step consists in using indirectly the FEM model to perform a global sensitivity analysis and to determine Sobol indices. In real life, the EC is constituted by a complex assembly of skin, soft tissues and bone parts. An innovative alternative is used here to take into account the coupling between the EP and the EC. In the rest of the frequency domain, the variation of the density, the Young modulus, and their interaction influence the attenuation on the whole frequency band.

Keywords


Frequency bands; Noise pollution; Axisymmetric; Complex assembly; FEM models; Finite element models; Frequency domains; Global sensitivity analysis; Hearing loss; Hearing protection devices; Input parameter; Noise exposure; Soft tissue; Young modulus

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