A single-layer formulation of Fourier-based planar NAH for enclosed spaces
2014 (English)In: Proceedings of EAA, European Acoustics Association (EAA), 2014Conference paper (Other academic)
One of the limitations of Fourier-based planar near-field acoustic holography (P-NAH) is that the wave-field extrapolation only holds for outgoing waves, making the study of certain vibro-acoustic sources in reverberant environments a costly and difficult procedure. The present paper is concerned with a single-layer formulation of Fourier-based P-NAH that accounts for the presence of partially absorbing surfaces. The underlying theory is based on the WRW model, which is a rather popular technique in the seismic processing community. Unlike P-NAH, the WRWmodel proposes a solution to the forward acoustic problem, by performing the spatial convolutions via matrix multiplications. The aim of this paper is to investigate the use of the WRW model for inverse acoustics, particularly in the context of P-NAH. Numerical reconstructions with baffled point sources are carried out, investigating a geometrical case with one reflector under noise-free conditions. Several combinations of frequencies, reflection coefficients, measurement apertures and reflector positions are explored. Opportune observations are made regarding the influence of the propagation distances on the numerical implementation of the Green’s functions. The source reconstructions are performed via free-field P-NAH and via the present formulation, aiming towards a quantitative and qualitative understanding of the influence of the partially absorbing surfaces.
Place, publisher, year, edition, pages
European Acoustics Association (EAA), 2014.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-172055ScopusID: 2-s2.0-84953257175OAI: oai:DiVA.org:kth-172055DiVA: diva2:845447
Forum Acusticum, 7-12 September,2014, Krakow
FunderSwedish Research Council
Qc 201508282015-08-112015-08-112016-03-07Bibliographically approved