Methods of predicting airframe noise generated by aircraft in flight under nonpowered conditions are discussed. Approaches to predictions relying on flyover data and component theoretical analyses are developed. A nondimensional airframe noise spectrum of various aircraft is presented. The spectrum was obtained by smoothing all the measured spectra to remove any peculiarities due to airframe protrusions, normalizing each spectra by its overall sound pressure level and a characteristics frequency, and averaging the spectra together. A chart of airframe noise sources is included. (Author)


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    Title :

    Prediction of Airframe Noise


    Contributors:
    J. C. Hardin (author) / D. J. Fratello (author) / R. E. Hayden (author) / Y. Kadman (author) / S. Africk (author)

    Publication date :

    1975


    Size :

    118 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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