Archives of Acoustics, 47, 2, pp. 241-257, 2022
10.24425/aoa.2022.141653

Research on Airflow Background Noise Suppression for Aeroacoustic Wind Tunnel Testing

Yuanwen LI
University of Science and Technology Beijing
China

Min LI
University of Science and Technology Beijing
China

Daofang FENG
University of Science and Technology Beijing
China

Debin YANG
University of Science and Technology Beijing
China

Long WEI
Beijing Institute of Structure and Environment Engineering
China

The microphone data collected in aeroacoustic wind tunnel test contains not only desired aeroacoustic signal but also background noise generated by the jet or the valve of the wind tunnel, so the desired aeroacoustic characteristics is difficult to be highlighted due to the low Signal-to-Noise Ratio (SNR). Classical cross spectral matrix removal can only reduce the microphone self-noise, but its effect is limited for jet noise. Therefore, an Airflow Background Noise Suppression method based on the Ensemble Empirical Mode Decomposition (ABNSEEMD) is proposed to eliminate the influence of background noise on aeroacoustic field reconstruction. The new method uses EEMD to adaptively separate the background noise in microphone data, which has good practicability for increasing SNR of aeroacoustic signal. A localization experiment was conducted by using two loudspeakers in wind tunnel with 80 m/s velocity. Results show that proposed method can filter out the background noise more effectively and improve the SNR of the loudspeakers signal compared with spectral subtraction and cepstrum methods. Moreover, the aeroacoustic field produced by a NACA EPPLER 862 STRUT airfoil model was also measured and reconstructed. Delay-and-sum beamforming maps of aeroacoustic source were displayed after the background noise was suppressed, which further demonstrates the proposed method’s advantage.
Keywords: aeroacoustic measurement; acoustic source localization; EEMD; background noise suppression; wind tunnel test.
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DOI: 10.24425/aoa.2022.141653

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