Multimodal propagation of sound in streets
- Autores: Adrien Pelat, Christophe Ayrault, Olivier Richoux, Simon Felix
- Localización: Proceedings of the ISRA 2007 Seville, Vol. 3, 2008 (Oral Session Communications), ISBN 9788469082676
- Idioma: español
- Enlaces
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Resumen
In this study we are concerned with a multimodal formulation of the acoustic propagation in long enclosures, considered as waveguides. Two infinite sets of coupled first-order differential equations are constructed for the components of the pressure and axial velocity, projected on the local transverse modes. These equations are ordinary differential equations that can be integrated after truncation at a sufficient number of modes and take into account the coupling between modes. Such a method appears to be particularly adapted to take into account geometrical (cross-section) or physical (boundary condition) non-uniformities in the waveguide, as well as the radiation or continuity conditions at the extremities. The formulation and main properties of a multimodal approach of the sound propagation in a room or urban acoustics context will be discussed. Numerical illustrations on 2D examples will also be given, as well as measurements from a scale model experiment.
