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국내 최대 기계 및 로봇 연구정보
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  • 시편연마기 Minitech 233~365 series
  • 공학설계D/B

    공학설계D/B 게시판 내용
    Volume Title Vibration and Acoustic Fatigue
    Volume No Loading actions (near-field jet, buzz-saw noise due to fan, turbulent boundary layer) and Damping (estimation in laminated plates, use of damping treatments).
    DATA Title Estimation of sound pressure levels due to buzz-saw noise within the intake duct of a supersonic fan or compressor.
    DATA Item 74033
    KEYWORD acoustic, buzz, compressor, fan, intake, level, loading, noise, pressure, program, saw, sound
    ISBN 0 85679 087 7
    ABSTRACT ESDU 74033 gives a method based on a statistical, theoretical treatment incorporating the characteristics of the shock waves generated by the fan. A set of curves enables the components of sound pressure level to be obtained; the first graph gives the component depending on distance upstream of the compressor and the pressure in the duct, the second gives a component depending on the Mach number at the fan, the third gives the component depending on the shock-wave characteristics and guidance on appropriate values for these is provided, and the fourth defines the envelope of the peaks of the tone spectrum and must be evaluated for each tone considered. Finally a curve defines the cut-off frequency below which tones do not effectively propagate along the duct. The method is programmed in Fortran as ESDUpac A 7433 and is provided on disc in the software volume both uncompiled and compiled within ESDUview, a user-friendly interface that prompts on-screen for input data.

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