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Une Méthode Numérique pour Calculer la Diffusion Acoustique d’une Source Mobile par Plusieurs Objets
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0002-7006-067X
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-0176-5358
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-4103-0129
2014 (French)In: 12e Congrès Français d'Acoustique, 2014Conference paper, Published paper (Other academic)
Abstract [en]

As part of a study of external noise propagation from moving ground vehicles, a numerical method is developed to compute the acoustic field emitted by a moving point source and its interaction with a near environment constituted of buildings or noise barriers for example. This method is developed with the purpose of being used in a vehicle design process therefore it must be low demanding on computational resources. This requires approximations. The problem is simplified to that of a constant speed moving harmonic monopole point source passing by one or more perfectly reflecting large objects in a quiescent flow field. The simpler case of a fixed point source is studied first. Reflections on nearby objects are computed through a Kirchhoff-Helmholtz integral equation to which is applied the Kirchhoff approximation, assuming the regime of high frequencies. Multiple scattering is computed by consecutive updates of surface pressure values. The effect of a movement of the source is accounted for through the introduction of a Doppler shift in the Kirchhoff-Helmhotlz equation. This method is validated against experimental results from literature for a case of simple scattering of a sound wave emitted by a fixed source and against results from a higher-order finite difference time-domain solver in case of multiple scattering of the sound wave emitted by a moving point source. Results are satisfying for the foreseen use of this method. 

Place, publisher, year, edition, pages
2014.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-159512OAI: oai:DiVA.org:kth-159512DiVA: diva2:785404
Conference
CFA 2014 Poitiers, france, 22-24 April 2014
Note

QC 20150205

Available from: 2015-02-02 Created: 2015-02-02 Last updated: 2016-06-13Bibliographically approved

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Pignier, NicolasO'Reilly, CiaránBoij, Susann

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