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http://dx.doi.org/10.5050/KSNVN.2006.16.7.677

Elimination of Self Noise & Doppler Effects from the Microphone Array Measurement  

Rhee, Wook (충남대학교 대학원 항공우주공학과)
Park, Sung (충남대학교 대학원 항공우주공학과)
Kim, Jai-Moo (한국항공우주연구원)
Choi, Jong-Soo (충남대학교 항공우주공학과)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.16, no.7, 2006 , pp. 677-682 More about this Journal
Abstract
In the case of aeroacoustic test in windtunnel, measurement accuracy is reduced by not only Doppler effects but also by the microphone self noise due to airflow and high turbulence in the wall boundary layer. Microphone array measurements can be easily utilized for the solutions of these problems. In this paper, geometrical optics approach and diagonal term elimination of cross spectral matrix was introduced to the de-dopplerization and self noise reduction methods for the microphone array measurement. For the validation, beamforming tests for sinusoidal point source were performed in the closed type test section of windtunnel, and their performances of beam width and sidelobe rejection were significantly improved.
Keywords
Microphone Array; Beamforming; Windtunnel Test; Source Localization; De-Dopplerization; Self Noise;
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  • Reference
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