This citation summarizes a one-page announcement of technology available for utilization. An analytical model predicts the noise levels inside propeller-driven aircraft during cruise at mach 0.8. The model has been applied to three aircraft with fuselages of different size (wide-body, narrow-body, and small-diameter) to determine the noise reductions required to achieve an A-weighted sound level that does not exceed 80 dB. The model was then used to determine noise-control methods that could achieve the required noise reductions. Only one concept, that of a double-wall sidewall, provides the high noise reductions required at low frequencies to achieve the 80-dB(A) goal. ...FOR ADDITIONAL INFORMATION: Contact: Tech. Transfer Div., P.O. Box 8757, BWI Airport, MD 21240; (301) 621-0100. Refer to: LAR-12954/TN.


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    Titel :

    Noise Control in Propeller-Driven Aircraft: Double-wall sidewalls minimize interior noise and weight


    Erscheinungsdatum :

    1984


    Format / Umfang :

    1 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




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