TY - JOUR N2 - 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. L1 - http://czasopisma.pan.pl/Content/123506/PDF/aoa.2022.141653.pdf L2 - http://czasopisma.pan.pl/Content/123506 PY - 2022 IS - No 2 EP - 257 DO - 10.24425/aoa.2022.141653 KW - aeroacoustic measurement KW - acoustic source localization KW - EEMD KW - background noise suppression KW - wind tunnel test A1 - Li, Yuanwen A1 - Li, Min A1 - Feng, Daofang A1 - Yang, Debin A1 - Wei, Long PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 47 DA - 2022.06.27 T1 - Research on Airflow Background Noise Suppression for Aeroacoustic Wind Tunnel Testing SP - 241 UR - http://czasopisma.pan.pl/dlibra/publication/edition/123506 T2 - Archives of Acoustics ER -