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Modélisation de la diffraction dans un programme de rayons sonores en utilisant le concept des lignes de flux énergétiques

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  • Engineering
  • Computing & Technology :: Electrical & Electronics Engineering [C06]
  • Ingénierie
  • Informatique & Technologie :: Ingénierie électrique & électronique [C06]
  • Computer Science
  • Mathematics
  • Musicology
  • Physics


Ray-tracing modelling of the diffraction by half-planes and slits based on the energy flow lines concept Ray-tracing modelling of the diffraction by half-planes and slits based on the energy flow lines concept A. Billona and J.-J. Embrechtsb aLaboratoire d’E´tude des Phe´nome`nes de Transfert et de l’Instantane´ite´ : Agro-industrie et Baˆtiment, Baˆtiment Fourier Avenue Michel Cre´peau F-17042 La Rochelle Cedex 1 bUniversity of Liege - Acoustics Labo, Campus du Sart-Tilman, B28, B-4000 Liege 1, Belgium [email protected] Proceedings of the Acoustics 2012 Nantes Conference 23-27 April 2012, Nantes, France 2385 Geometrical acoustics models are currently the most popular prediction tools in room-acoustics due to their low computing load. However, they seldom take into account the diffraction occurring at free edges or apertures. Moreover, the existing diffraction models implemented in geometrical acoustics algorithms are either limited to specularly reflected paths or either present excessive complexity. Recently, a diffraction model based on an ap- proximation of the far-field direction of the Poynting’s vector has been implemented in an acoustic ray-tracing software. This model can handle both diffuse and specular reflections and sets no limit in terms of order of reflec- tion or diffraction by half-planes. Results for single and double diffraction problems are presented here. Moreover, this model is developed to handle diffraction occurring at slits and comparisons with experimental results are shown. 1 Introduction Geometrical acoustics models are very popular in room- acoustics due to their relatively low computation time com- pared to the more computationally intensive methods solving the wave equation [1]. However, they only model the prop- agation of the acoustic intensity and neglect the phase infor- mation of the waves. These assumptions imply that diffrac- tion occurring at free edges is not modeled, limiting their ap- plications. To handle these phenomena, two models ex

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