Turbomachinery
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
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Volume 40, Issue 11
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Technical papers
  • BPF Sound Measurement Radiated from a Centrifugal Compressor
    Satoshi OHUCHIDA, Koichiro TANAKA
    Article type: Technical papers
    2012 Volume 40 Issue 11 Pages 697-701
    Published: 2012
    Released on J-STAGE: April 07, 2015
    DOIhttps://doi.org/10.11458/tsj.40.697
    JOURNAL FREE ACCESS
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    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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