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Global, and Local Optimization Beamforming for Broadband Sources

Goudarzi, Armin (2024) Global, and Local Optimization Beamforming for Broadband Sources. Journal of the Acoustical Society of America, 155 (1), 262 -273. Acoustical Society of America. doi: 10.1121/10.0024247. ISSN 0001-4966.

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Offizielle URL: https://doi.org/10.1121/10.0024247

Kurzfassung

This paper presents an alternative energy function for Global Optimization (GO) beamforming, tailored to acoustic broadband sources. Given, that properties such as the source location, multipole rotation, or flow conditions are parameterized over the frequency, a CSM-fitting can be performed for all frequencies at once. A numerical analysis shows that the nonlinear energy function for the standard GO problem is equivalent to the source's Point Spread Function (PSF) and contains local minima at the grating- and side lobes' locations. The energy function is improved with the proposed broadband energy, as it averages the PSF. Further, it simplifies the process of identifying sources and reconstructing their spectra from the results. The paper shows that the method is superior on synthetic monopoles compared to standard GO and CLEAN-SC. For real-world data the results of the proposed method and CLEAN-SC are similar, and outperform standard GO. The main difference is that source assumption violations cause noisy maps for CLEAN-SC and cause wrong spectral estimations of the proposed method. By using reasonable initial values, the GO problem reduces to a Local Optimization problem with similar results. Further, the proposed method is able to identify synthetic multipoles with different pole amplitudes and unknown pole rotations.

elib-URL des Eintrags:https://elib.dlr.de/203112/
Dokumentart:Zeitschriftenbeitrag
Titel:Global, and Local Optimization Beamforming for Broadband Sources
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Goudarzi, Arminarmin.goudarzi (at) dlr.dehttps://orcid.org/0000-0002-2437-028X156844826
Datum:11 Januar 2024
Erschienen in:Journal of the Acoustical Society of America
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:155
DOI:10.1121/10.0024247
Seitenbereich:262 -273
Verlag:Acoustical Society of America
ISSN:0001-4966
Status:veröffentlicht
Stichwörter:Global Optimization (GO) beamforming, Point Spread Function (PSF), CLEAN-SC, acoustic broadband sources, multipole rotation
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Effizientes Luftfahrzeug
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L EV - Effizientes Luftfahrzeug
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Flugzeug und Validierung
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren, GO
Hinterlegt von: Micknaus, Ilka
Hinterlegt am:03 Apr 2024 10:47
Letzte Änderung:18 Jun 2024 13:30

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