Modeling of broadband moving sources for time-domain simulations of outdoor sound propagation
| Autor: | Franck Poisson, Didier Dragna, Philippe Blanc-Benon |
|---|---|
| Přispěvatelé: | Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Société nationale des Chemins de Fer français - SNCF |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | AIAA Journal AIAA Journal, American Institute of Aeronautics and Astronautics, 2014, 52 (9), pp.1928-1939. ⟨10.2514/1.J052672⟩ |
| ISSN: | 0001-1452 1533-385X |
| DOI: | 10.2514/1.J052672⟩ |
| Popis: | Although time-domain solutions of the linearized Euler equations are well adapted to study the acoustic propagation in an outdoor environment, the modeling of sources in motion in time-domain solvers has not been investigated in the literature yet. This is done here by considering distributed volume sources. First, the influence of the spatial distribution of the source on the acoustic field is analyzed. Results obtained for a nonmoving source are summarized, and the example of a Gaussian spatial distribution is presented. The case of a harmonic volume source moving at a constant speed is then investigated in the geometrical far field. The directivity of a noncompact source is shown to be dramatically different from that of a point source. Numerical simulations are performed in a three-dimensional geometry in free-field configurations, and waveforms of the acoustic pressure exhibit Doppler shift and convective amplification. Finally, simulations of a broadband moving source above an impedance ground surfa... |
| Databáze: | OpenAIRE |
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