ターボ機械
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
40 巻, 11 号
選択された号の論文の1件中1~1を表示しています
論文
  • 大内田 聡, 田中 浩一郎
    原稿種別: 論文
    2012 年 40 巻 11 号 p. 697-701
    発行日: 2012年
    公開日: 2015/04/07
    ジャーナル フリー
    A measurement technique of radiated BPF sound from turbocharger compressor is treated in this paper. Since the environment of measurement in this study is not anechoic and the level of background noise is high, we could not find BPF peak level in the obtained sound spectrum measured by normal measurement microphone. A microphone with parabolic cone is used instead to reduce the effect of background noise. Using this technique, discrete peak of BPF is clearly observed in the result. To obtain absolute BPF level from the result, a level correction is needed due to the amplification effect of parabolic cone. We also conducted an experiment to measure amplification effect. The method in this study is also applicable to sound measurement those with high level of background noise.
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