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Wavenumber-domain method for source reconstruction from far-field array measurements in flow

Wavenumber-domain method for source reconstruction from far-field array measurements in flow
Wavenumber-domain method for source reconstruction from far-field array measurements in flow
This paper covers the relationship between the far-field sound radiation of a planar acoustic source in the presence of a mean flow and the Spatial Fourier Transform of the source strength distribution, and proposes an inverse approach for source strength estimation from far-field data. It is shown that each microphone effectively “samples” the source wavenumber spectrum at a specific wavenumber associated to its position; hence, a particular microphone array geometry and location is inherently linked to a “visibility region” in the source wavenumber domain, and the array performance is directly related to which wavenumber spectrum components it is able to observe. It is also shown that this method is analytically equivalent to a classical frequency-domain beamforming when assuming far-field-approximated transfer functions.
Casagrande Hirono, Fabio
ef8c2e33-96ec-467b-874d-74f0f9bb5f09
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Fazi, Filippo Maria
e5aefc08-ab45-47c1-ad69-c3f12d07d807
Casagrande Hirono, Fabio
ef8c2e33-96ec-467b-874d-74f0f9bb5f09
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Fazi, Filippo Maria
e5aefc08-ab45-47c1-ad69-c3f12d07d807

Casagrande Hirono, Fabio, Joseph, Phillip and Fazi, Filippo Maria (2018) Wavenumber-domain method for source reconstruction from far-field array measurements in flow. 7th Berlin Beamforming Conference 2018, Berlin, Germany. 05 - 06 Mar 2018. 19 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper covers the relationship between the far-field sound radiation of a planar acoustic source in the presence of a mean flow and the Spatial Fourier Transform of the source strength distribution, and proposes an inverse approach for source strength estimation from far-field data. It is shown that each microphone effectively “samples” the source wavenumber spectrum at a specific wavenumber associated to its position; hence, a particular microphone array geometry and location is inherently linked to a “visibility region” in the source wavenumber domain, and the array performance is directly related to which wavenumber spectrum components it is able to observe. It is also shown that this method is analytically equivalent to a classical frequency-domain beamforming when assuming far-field-approximated transfer functions.

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More information

Published date: 5 March 2018
Venue - Dates: 7th Berlin Beamforming Conference 2018, Berlin, Germany, 2018-03-05 - 2018-03-06

Identifiers

Local EPrints ID: 418759
URI: https://eprints.soton.ac.uk/id/eprint/418759
PURE UUID: 470acecf-d446-471d-a6e9-bf9a31b23833
ORCID for Fabio Casagrande Hirono: ORCID iD orcid.org/0000-0003-4167-6720

Catalogue record

Date deposited: 21 Mar 2018 17:30
Last modified: 14 Mar 2019 01:30

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Contributors

Author: Fabio Casagrande Hirono ORCID iD
Author: Phillip Joseph

University divisions

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