Recent results are presented from several research efforts aimed at the understanding of rotorcraft blade-vortex interaction noise generation, directivity, and control. The results are based on work performed by researches at the NASA Langley Research Center, both alone and in collaboration with other research organizations. Based on analysis of a simplified physical model, the critical parameters controlling the noise generation are identified. Detailed mapping of the acoustic radiation field reveals the extreme sensitivity of directivity to rotor advance ratio and disk attitude. A means of controlling blade-vortex interaction noise by higher harmonic pitch control is discussed.


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    Titel :

    Rotorcraft blade/vortex interaction noise - Its generation, radiation, and control


    Beteiligte:
    Preisser, J. S. (Autor:in) / Brooks, T. F. (Autor:in) / Martin, R. M. (Autor:in)

    Kongress:

    ICAS Congress


    Erscheinungsdatum :

    01.01.1990


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :




    Recent studies of rotorcraft blade-vortex interaction noise

    Preisser, J. S. / Brooks, T. F. / Martin, R. M. | NTRS | 1994


    Recent studies of rotorcraft blade-vortex interaction noise

    Preisser, J. S. / Brooks, T. F. / Martin, R. M. | AIAA | 1994


    Rotorcraft Blade-Vortex Interaction Controller

    Schmitz, Fredric H. | NTRS | 1995