The goal of this research is the understanding of helicopter internal noise mechanisms and the development, design, and testing of noise control concepts which will produce significant reductions in the acoustic environment to which passengers are exposed. The Phase 3 effort involved the identification and evaluation of current and advanced treatment concepts, including isolation of structure-borne paths. In addition, a plan was devised for the full-scale evaluation of an isolation concept. Specific objectives were as follows: (1) identification and characterization of various noise control concepts; (2) implementation of noise control concepts within the S-76 SEA (statistical energy analysis) model; (3) definition and evaluation of a preliminary acoustic isolation design to reduce structure-borne transmission of acoustic frequency main gearbox gear clash vibrations into the airframe; (4) formulation of a plan for the full-scale validation of the isolation concept; and (5) prediction of the cabin noise environment with various noise control concepts installed.


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    Titel :

    Development of Rotorcraft Interior Noise Control Concepts. Phase 3. Development of Noise Control Concepts


    Beteiligte:
    C. A. Yoerkie (Autor:in) / P. J. Gintoli (Autor:in) / S. T. Ingraham (Autor:in) / J. A. Moore (Autor:in)

    Erscheinungsdatum :

    1986


    Format / Umfang :

    149 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Development of rotorcraft interior noise control concepts. Phase 3: Development of noise control concepts

    Yoerkie, Charles A. / Gintoli, P. J. / Ingraham, S. T. et al. | NTRS | 1986


    Development of rotorcraft interior. Noise control concepts. Phase 1: Definition study

    Yoerkie, C. A. / Moore, J. A. / Manning, J. E. | NTRS | 1983


    Development of Rotorcraft Interior. Noise Control Concepts. Phase 1: Definition Study

    C. A. Yoerkie / J. A. Moore / J. E. Manning | NTIS | 1983



    Active Control of Rotorcraft Interior Noise

    Elliott, S. J. / Boucher, C. C. / Sutton, T. J. et al. | British Library Conference Proceedings | 1997