This paper briefly reviews rotorcraft noise mechanisms and their approximate importance for different types of rotorcraft in different flight regimes. Discrete noise is due to periodic flow disturbances and includes impulsive noise produced by phenomena which occur during a limited segment of a blade's rotation. Broadband noise results when rotors interact with random disturbances, such as turbulence, which can originate in a variety of sources. The status of analysis techniques for these mechanisms are reviewed. Also, some recent progress is presented on the understanding and analysis of tilt rotor aircraft noise due to: (1) recirculation and blockage effects of the rotor flow in hover; and (2) blade-vortex interactions in forward and descending flight.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Rotorcraft Noise: Status and Recent Developments


    Contributors:
    A. R. George (author) / B. W. Sim (author) / D. R. Polak (author)

    Publication date :

    1993


    Size :

    28 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Rotorcraft Noise - Status and Recent Developments

    George, A. R. / Sim, B. W. C. / Polak, D. R. | British Library Conference Proceedings | 1993


    Rotorcraft noise: Status and recent developments

    George, Albert R. / Sim, Ben WEL-C. / Polak, David R. | NTRS | 1993


    Rotorcraft research in India: recent developments

    Ganguli, Ranjan | Emerald Group Publishing | 2010


    Rotorcraft research in India: recent developments

    Ganguli, Ranjan | Online Contents | 2010