An account is given of the contributions made by NASA-Langley's rotorcraft noise research programs over the last five years. Attention has been given to the broadband and blade-vortex interaction noise sources; both analytical and empirical noise-prediction codes have been developed and validated for several rotor noise sources, and the 'Rotonet' comprehensive system-noise prediction capability has been instituted. Among the technologies explored for helicopter noise reduction have been higher harmonic control and active vibration-suppression.


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    Titel :

    NASA/AHS rotorcraft noise reduction program - NASA Langley Acoustics Division contributions


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    1989-06-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    The NASA/AHS Rotorcraft Noise Reduction Program

    Childress, Otis S., Jr. | NTRS | 1988


    Vibro-Acoustics Modal Testing at NASA Langley Research Center

    Pappa, Richard S. / Pritchard, Jocelyn I. / Buehrle, Ralph D. | NTRS | 1999


    NASA Langley flight test program

    Lewis, Mike | NTRS | 1991



    NASA Langley Flight Test Program

    M. Lewis | NTIS | 1991