Micro-perforated plate (MPP) absorbers are perforated plates with holes typically in the sub mm range and perforation ratios around 1%. The values are typical for applications in air at standard temperature and pressure (STP). The underlying acoustic principle is simple, it is to create a surface with a built in damping which effectively absorbs sound waves. To achieve this, the acoustic impedance of a MPP absorber is normally tuned to be of the order of the characteristic wave impedance in the medium (~ 400 Pa*s/m in air at STP). The traditional application for MPP absorbers has been building acoustics often combined with a so called panel absorber, to create an absorption peak at a selected frequency. However, MPP absorbers made of metal could also be used for noise control close to or at the source in many vehicle applications.


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    Titel :

    Acoustical Study of Micro- Perforated Plates for Vehicle Applications


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Åbom, Mats (Autor:in) / Allam, Sabry (Autor:in) / Guo, Ying (Autor:in)

    Kongress:

    SAE 2009 Noise and Vibration Conference and Exhibition ; 2009



    Erscheinungsdatum :

    2009-05-19




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


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    Calculation of Acoustical Characteristics of the Sound Insulation Pad by Micro Perforated Membrane Theory

    Zhu, Keda / Wentzel, Richard E. / Huang, Wei et al. | SAE Technical Papers | 2013


    Homogenisation of perforated plates

    Naqvi, Shiza / Ayton, Lorna J. | AIAA | 2022


    Homogenisation of Perforated Plates

    Naqvi, Shiza / Ayton, Lorna J. | British Library Conference Proceedings | 2022