116 NAHによる音源探査を実用的に用いるための計測と処理の指針に関する考察(サイレント工学II:振動と音響の評価)(OS.04 : サイレント工学)

概要

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Sound source visualization is very worthy to reduce the machinery noise. Near-field acoustic holography (NAH) can give the precise image of sound source location from the distribution of complex sound pressure in spite of low frequency of sound. In this report, microphone array system is used for the measurement, however, the aperture size of microphone array is not so large. The effect of small aperture of sound pressure distribution to the result of NAH is investigated, and the optimal filter shape in spatial wave number domain is proposed. Experimental results show the errors included in the sound pressure distribution measured by the microphone array system, and it is shown that the effect of the measurement error to the NAH appears in low frequency.
一般社団法人日本機械学会の論文
2001-08-03