능동음원 및 벽면 어드미턴스 측정을 통한 실내 소음원 규명Identification of Interior Noise Sources by Reconstructing Active Sources and Surface Admittance

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Nearfield acoustic holography [J. D. Maynard, and et al, J. Acoust. Soc. Am, 78, 1395-1413, 1985] has been used to reconstruct sound fields near sound sources. The reconstructed sound fields show noise source locations in exterior sound fields. However, in enclosures, the reconstructed sound fields generally do not show correct source locations. Since reflections are included in the field, the spatial distribution of reconstructed values does not coincide with source distribution. In this paper, we introduce a method to estimate active sources in enclosures. After eliminating the effect of reflections, we estimate the distribution of the sources that actively radiate sound into enclosures. An in-situ technique to measure surface admittance is also proposed. We use the surface admittance to eliminate the effect of reflections. Numerical simulations and experiments in two-dimensional sound fields verify the method.
Publisher
한국자동차공학회
Issue Date
1999
Language
KOR
Citation

한국자동차공학회 99년도 춘계학술대회 , pp.465 - 470

URI
http://hdl.handle.net/10203/137260
Appears in Collection
ME-Conference Papers(학술회의논문)
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