Methods developed at the NASA Lewis Research Center for predicting the noise contributions from various aircraft noise sources were programmed to predict aircraft noise levels either in flight or in ground tests. The noise sources include fan inlet and exhaust, jet, flap (for powered lift), core (combustor), turbine, and airframe. Noise propagation corrections are available for atmospheric attenuation, ground reflections, extra ground attenuation, and shielding. Outputs can include spectra, overall sound pressure level, perceived noise level, tone-weighted perceived noise level, and effective perceived noise level at locations specified by the user. Footprint contour coordinates and approximate footprint areas can also be calculated. Inputs and outputs can be in either System International or U.S. customary units. The subroutines for each noise source and propagation correction are described. A complete listing is given.


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    Title :

    Computer Program to Predict Aircraft Noise Levels


    Contributors:
    B. J. Clark (author)

    Publication date :

    1981


    Size :

    146 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    Computer program to predict noise of general aviation aircraft: User's guide

    Mitchell, J. A. / Barton, C. K. / Kisner, L. S. et al. | NTRS | 1982


    Computer Program to Predict Noise of General Aviation Aircraft: User's Guide

    J. A. Mitchell / C. K. Barton / L. S. Kisner et al. | NTIS | 1982


    Predicting Aircraft Noise Levels

    Clark, B. J. | NTRS | 1983