Beamforming is an imaging tool for the investigation of aeroacoustic phenomena and results in high-dimensional data that are broken down to spectra by integrating spatial regions of interest. This paper presents two methods that enable the automated identification of aeroacoustic sources in sparse beamforming maps and the extraction of their corresponding spectra to overcome the manual definition of regions of interest. The methods are evaluated on two scaled airframe half-model wind tunnel measurements and on a generic monopole source. The first relies on the spatial normal distribution of aeroacoustic broadband sources in sparse beamforming maps. The second uses hierarchical clustering methods. Both methods are robust to statistical noise and predict the existence, location, and spatial probability estimation for sources based on which regions of interest are automatically determined.
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September 2021
September 14 2021
Automatic source localization and spectra generation from sparse beamforming mapsa)
Special Collection:
Machine Learning in Acoustics
A. Goudarzi
;
A. Goudarzi
b)
1
Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR)
, Göttingen, Germany
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C. Spehr
;
C. Spehr
c)
1
Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR)
, Göttingen, Germany
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S. Herbold
S. Herbold
d)
2
Institute of Computer Science, University of Göttingen
, Göttingen, Germany
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b)
Electronic mail: armin.goudarzi@dlr.de, ORCID: 0000-0002-2437-028X.
c)
ORCID: 0000-0002-2744-3675.
d)
ORCID: 0000-0001-9765-2803.
a)
This paper is part of a special issue on Machine Learning in Acoustics.
J. Acoust. Soc. Am. 150, 1866–1882 (2021)
Article history
Received:
February 01 2021
Accepted:
July 26 2021
Citation
A. Goudarzi, C. Spehr, S. Herbold; Automatic source localization and spectra generation from sparse beamforming maps. J. Acoust. Soc. Am. 1 September 2021; 150 (3): 1866–1882. https://doi.org/10.1121/10.0005885
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