This paper presents the results of an investigation on the influence of a duct’s geometry and shape on its acoustic length, which differs from its physical length by a factor referred to as end-correction. In addition to traditional parameters such as length and diameter, the author has investigated the effect of additional geometry features which are less commonly addressed in the technical literature, such as a diameter contraction or a bent section along the duct. The relative microphone position with respect to the pipe orifice and to the ground surface of the measurement environment has been investigated, showing negligible impact on the measurement results. The sound wave propagation within a pipe featuring a diameter contraction has then been analysed, showing the relationship between the pipe contraction shape and location and the pipe acoustic length. The author has finally investigated the potential effect of a bending in the final section of the pipe, also showing an impact on the pipe effective length.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    End-Correction in Open Ducts: An Experimental Study


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    12th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference ; 2022



    Publication date :

    2022-06-15




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    End-Correction in Open Ducts: An Experimental Study

    Greco, Andrea / Graf, Bernhard | British Library Conference Proceedings | 2022


    FLOORING INCORPORATING OPEN AND ENCLOSED AIR DUCTS

    DAVIS BRIAN LESTER / BIRKMANN JOHN PATRICK / HORNE MARK RUSSELL | European Patent Office | 2017

    Free access

    Flooring incorporating open and enclosed air ducts

    DAVIS BRIAN LESTER / BIRKMANN JOHN PATRICK / HORNE MARK RUSSELL | European Patent Office | 2019

    Free access


    Experimental and Numerical Study of Oscillating Transonic Shock Waves in Ducts

    Bruce, P. J. K. / Babinsky, H. / Tartinville, B. et al. | AIAA | 2011