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Tuesday, July 9 • 10:50 - 11:10
SOUND SYNTHESIS OF AN ARBITRARILY MOVING SOURCE ABOVE FREQUENCY-DEPENDENT GROUND

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Vehicle pass-by-noise (PBN) testing has become of even greater importance due to stringent regulations in Europe where a reduction from 74 dB(A) to 68 dB(A) in noise levels is required by 2024. Manufacturers are in search of new techniques to predict PBN noise emission in early stages of vehicle design. Among the relevant phenomena involved in a PBN test, the ground reflection accounts for a large portion of the overall noise level. Hence, there is a need for including accurate modeling of the ground reflection in a PBN scenario. This paper proposes an analytical description of an arbitrarily moving source considering frequency dependent ground reflection. The model relies on the transient time delayed Green's function formulation which extends the result of classical Doppler Weyl-Van der Pol equation for arbitrary source path and velocity. The image source method model the wave reflected by the ground by means of a Doppler shifting and frequency-dependent ground impedance model. The final goal is to offer an early-stage design assessment of an exterior PBN test by means of overall sound pressure levels as well as binaural sound synthesis (auralization) in view to run sound perception tests.

Moderators
CC

Cédric Camier

Dr, Saint-Gobain Research Paris
avatar for Philippe-Aubert Gauthier

Philippe-Aubert Gauthier

Professor, Groupe Acoustique Université de Sherbrooke, Université de Sherbrooke

Authors

Tuesday July 9, 2019 10:50 - 11:10 EDT
Westmount 4
  T04 Environ. & commun. noise, SS01 Soundscape auralization