Measurements on helicopters in flight have been performed in order to improve the noise characteristics used in computer simulations of helicopter noise. A new method of deriving a three-dimensional directivity pattern of the noise source from the measurements is presented. The method is based on a fit of the measured data to spherical harmonics. Using these models, the sound emission for different flight procedures is investigated and compared to measured data. The novel three-dimensional model allows significantly improved sound simulation accuracy.


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    Title :

    Modeling of three-dimensional sound directivity patterns of helicopters


    Additional title:

    Modellierung der drei-dimensionalen Schallrichtmuster von Helicoptern


    Contributors:
    Krebs, W. (author) / Bütikofer, R. (author) / Plüss, S. (author) / Thomann, G. (author)

    Published in:

    Publication date :

    2003


    Size :

    7 Seiten, 6 Bilder, 4 Tabellen, 21 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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