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자료유형
학술저널
저자정보
황은수 (Korea Aerospace Research Institute) 최영민 (University of Science and Technology) 김양원 (Korea Aerospace Research Institute) 조태환 (Korea Aerospace Research Institute)
저널정보
한국소음진동공학회 한국소음진동공학회논문집 한국소음진동공학회논문집 제25권 제3호
발행연도
2015.3
수록면
150 - 159 (10page)

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An experimental study on frequency characteristics of the microphone array covered with Kevlar sheet was conducted in the closed test section. Microphones that were flush-mounted in the wall of wind tunnel were subjected to very high flow noise resulting from the turbulence in the wall boundary layer. This noise interference by the boundary layer was referred as ‘a microphone self-noise’ and various approaches were studied to reduce this interference. Recessed microphone array with high tensioned cover was one of the good approaches to reduce this self-noise. But, the array cover could cause an unexpected interference to the measuring results. In this paper the frequency characteristics of the microphone array with Kevlar cover was experimentally studied. The white noise was used as a reference noise source. Three kinds of tensions for the Kevlar cover were tested and those results were compared with the test results without the Kevlar cover. The gap effect between the cover and microphone head was also tested to find out the proper position of microphone in the array module. Test results show that the mid-tension and 10mm gap was the best choice in the tested cases.

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