Numerical and Experimental Investigation of the Generation of Wind Noise in Hearing Aids

Riedel J, Krömer F, Ritter H, Bayer K, Tamil J, Lommel D, Becker S (2019)

Publication Language: English

Publication Type: Conference contribution, Abstract of lecture

Publication year: 2019

Event location: Aachen DE

URI: https://pub.dega-akustik.de/ICA2019/data/articles/000535.pdf

Abstract

Hearing aid users are often confronted with the problem of wind noise during outdoor activities. The micro-
phones installed in the hearing aids cannot distinguish whether the deflection of the diaphragm is caused by
acoustic or hydrodynamic pressure fluctuations. This results in unpleasant background noise, which superim-
poses the acoustic signal. A dual approach consisting of CFD simulations using Star-CCM+ and measure-
ments in an anechoic wind tunnel was used to investigate geometric features such as the shape of the housing
and the rocker-switch with regard to their influence on wind noise generation. Using additive manufactured
hearing-aid-prototypes, the input-related time-pressure signal at the microphone membrane was measured in
the experimental approach. In the simulation, the corresponding signal was calculated using Delayed Detached
Eddy Simulation. A comparison of the obtained pressure spectra from simulation and experiment shows very
good agreement in the characteristic low-frequency range. The visualization of the numerical results provides
information on which fluid dynamic effects, such as boundary layer separation and vortex formation, lead to the
generation of wind noise. The results obtained are useful for estimating the performance of hearing aid models
under the influence of wind at an early stage of product development.

Authors with CRIS profile

Jörg Riedel Lehrstuhl für Prozessmaschinen und Anlagentechnik (iPAT) Florian Zenger Lehrstuhl für Prozessmaschinen und Anlagentechnik (iPAT) Stefan Becker Technische Fakultät

Involved external institutions

Sivantos GmbH DE Germany (DE)

How to cite

APA:

Riedel, J., Krömer, F., Ritter, H., Bayer, K., Tamil, J., Lommel, D., & Becker, S. (2019). Numerical and Experimental Investigation of the Generation of Wind Noise in Hearing Aids. Paper presentation at 23rd International Congress on Acoustics, Aachen, DE.

MLA:

Riedel, Jörg, et al. "Numerical and Experimental Investigation of the Generation of Wind Noise in Hearing Aids." Presented at 23rd International Congress on Acoustics, Aachen 2019.

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