title: Impulse propagation over a complex site: a comparison of experimental results and numerical predictions.
abstract: Results from outdoor acoustic measurements performed in a railway site near Reims in France in May 2010 are compared to those obtained from a finite-difference time-domain solver of the linearized Euler equations. During the experiments, the ground profile and the different ground surface impedances were determined. Meteorological measurements were also performed to deduce mean vertical profiles of wind and temperature. An alarm pistol was used as a source of impulse signals and three microphones were located along a propagation path. The various measured parameters are introduced as input data into the numerical solver. In the frequency domain, the numerical results are in good accordance with the measurements up to a frequency of 2 kHz. In the time domain, except a time shift, the predicted waveforms match the measured waveforms with a close agreement.
authors.affiliation: Laboratoire de Mécanique des Fluides et d'Acoustique, UMR CNRS 5509, École Centrale de Lyon, Université de Lyon, 36 Avenue Guy de Collongue, 69134 Écully Cedex, France.
authors.forename: Didier
authors.initials: D
authors.lastname: Dragna
authors.affiliation: Laboratoire de Mécanique des Fluides et d'Acoustique, UMR CNRS 5509, École Centrale de Lyon, Université de Lyon, 36 Avenue Guy de Collongue, 69134 Écully Cedex, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Blanc-Benon
authors.affiliation: Société Nationale des Chemins de fer Français, 40 Avenue des Terroirs de France, 75611 Paris Cedex 12, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Poisson
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D003198:Computer Simulation; D008962:Models, Theoretical; D009038:Motion; D009624:Noise, Transportation; D009716:Numerical Analysis, Computer-Assisted; D011890:Railroads; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014159:Transducers; D014919:Wind