Aircraft sound levels measured at specific monitoring locations may depend on microphone height. Well controlled measurements at 1.2 m and at 10 m above porous ground illustrate how the low frequency components of the spectrum vary with microphone height. The overall influence of microphone height on the A-weighted levels is small for aircraft with jet engines in a flyover situation and for distances shorter than 1000 m. The microphone at 1.2 m measures lower levels than a higher microphone in cases where the measurement site is far to the side of the flight path that is at low elevation angles of sound incidence, and when the measured spectrum is dominated by low frequencies, as this is often the case with propeller driven aircraft and propagation over long distances.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Aircraft sound measurements: the influence of microphone height


    Additional title:

    Schallmessungen bei Luftfahrzeugen: Einfluss der Mikrofonhöhe


    Contributors:

    Published in:

    Publication date :

    2005


    Size :

    8 Seiten, 5 Bilder, 3 Tabellen, 15 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Atmospheric Effects on Microphone Array Analysis of Aircraft Vortex Sound

    Wassaf, Hadi / Hardin, Jay / Wang, Frank | AIAA | 2006



    Flyover noise measurements on landing aircraft with a microphone array

    Michel, U. / Helbig, J. / Barsikow, B. et al. | AIAA | 1998


    Sound intensity measurements inside aircraft

    Gade, S. | Tema Archive | 1987


    AIAA-2006-2539 Atmospheric Effects on Microphone Array Analysis of Aircraft Vortex Sound

    Wassaf, H. / Hardin, J. / Wang, F. et al. | British Library Conference Proceedings | 2006