Sound exposure level (SEL) data from three Army helicopters were used to test a proposed method for calculating sideline decay developed for fixed-wing aircraft. The Federal Aviation Administration (FAA) and the U.S. Air Force (USAF) have adopted this method for use with fixed-wing aircraft, and it was desired to know if the same method could predict rotary-wing aircraft sideline decay with distance or if a more complex computer model is necessary. The procedure was found accurate for limited altitudes and slant distances. In addition, the sideline decay data were studied using variables known to affect sound attenuation. The purpose was to gain further insight into the mechanisms of sideline decay with distance. Variations in the results suggest an unknown mechanism is contributing to this attenuation. (Author)


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Prediction and modeling of helicopter noise


    Weitere Titelangaben:

    Vorberechnung und Modellerstellung fuer die Geraeuschentstehung bei Hubschraubern


    Beteiligte:
    Raspet, R. (Autor:in) / Kief, M. (Autor:in) / Daniels, R. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1984


    Format / Umfang :

    54 Seiten


    Medientyp :

    Report


    Format :

    Print


    Sprache :

    Englisch




    Prediction and Modeling of Helicopter Noise

    R. Raspet / M. Kief / R. Daniels | NTIS | 1984


    Recent developments in rotor wake modeling for helicopter noise prediction

    Poling, D. / Dadone, L. / Althoff, S. | NTRS | 1991


    New Prediction Methods for Helicopter Noise

    Lowson, M. V. / Associazione Italiana di Aeronautica ed Astronautica / Associazone Industrie Aerospaziali | British Library Conference Proceedings | 1993



    Validation of a Helicopter Noise Prediction System

    Kondo, N. / Nakamura, H. / Yamakawa, E. et al. | British Library Conference Proceedings | 2000