Coherent interferometric imaging in a random flow

Autor: Éric Savin, Luc Bonnet, Josselin Garnier, Christophe Peyret
Přispěvatelé: DAAA, ONERA, Université Paris-Saclay [Châtillon], ONERA-Université Paris-Saclay, Laboratoire de Probabilités, Statistiques et Modélisations (LPSM (UMR_8001)), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), CentraleSupélec, DTIS, ONERA, Université Paris Saclay [Palaiseau], Centre de Mathématiques Appliquées - Ecole Polytechnique (CMAP), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Analyse d’interactions stochastiques intelligentes et coopératives (ASCII), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Acoustics and Ultrasonics
Acoustics
FOS: Physical sciences
02 engineering and technology
01 natural sciences
Random flow
symbols.namesake
Travel-time migration
[SPI]Engineering Sciences [physics]
0203 mechanical engineering
[MATH.MATH-ST]Mathematics [math]/Statistics [math.ST]
0103 physical sciences
[MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP]
Doppler shift
[MATH]Mathematics [math]
010301 acoustics
ComputingMilieux_MISCELLANEOUS
Physics
[PHYS]Physics [physics]
Jet (fluid)
Kirchhoff migration
Turbulence
Mechanical Engineering
Seismic migration
Fluid Dynamics (physics.flu-dyn)
Acoustic wave
Physics - Fluid Dynamics
Condensed Matter Physics
Euler equations
[MATH.MATH-PR]Mathematics [math]/Probability [math.PR]
Interferometry
020303 mechanical engineering & transports
Flow (mathematics)
Mechanics of Materials
Physics - Data Analysis
Statistics and Probability
symbols
Coherent interferometry
Doppler effect
Data Analysis
Statistics and Probability (physics.data-an)
Zdroj: Journal of Sound and Vibration
Journal of Sound and Vibration, Elsevier, 2021, 494, pp.115852. ⟨10.1016/j.jsv.2020.115852⟩
Journal of Sound and Vibration, 2021, 494, pp.115852. ⟨10.1016/j.jsv.2020.115852⟩
ISSN: 0022-460X
1095-8568
Popis: International audience; This paper is concerned with the development of imaging methods to localize sources or reflectors in inhomogeneous moving media with acoustic waves that have travelled through them. A typical example is the localization of broadband acoustic sources in a turbulent jet flow for aeroacoustic applications. The proposed algorithms are extensions of Kirchhoff migration (KM) and coherent interferometry (CINT) which have been considered for smooth and randomly inhomogeneous quiescent media so far. They are constructed starting from the linearized Euler equations for the acoustic perturbations about a stationary ambient flow. A model problem for the propagation of acoustic waves generated by a fixed point source in an ambient flow with constant velocity is addressed. Based on this result imaging functions are proposed to modify the existing KM and CINT functions to account for the ambient flow velocity. They are subsequently tested and compared by numerical simulations in various configurations, including a synthetic turbulent jet representative of the main features encountered in actual jet flows.
Databáze: OpenAIRE
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