Langley Research Center efforts to develop a methodology for predicting the effective perceived noise level (EPNL) produced by jet-powered CTOL aircraft to an accuracy of + or - 1.5 dB are summarized with emphasis on the aircraft noise prediction program (ANOPP) which contains a complete set of prediction methods for CTOL aircraft including propulsion system noise sources, aerodynamic or airframe noise sources, forward speed effects, a layered atmospheric model with molecular absorption, ground impedance effects including excess ground attenuation, and a received noise contouring capability. The present state of ANOPP is described and its accuracy and applicability to the preliminary aircraft design process is assessed. Areas are indicated where further theoretical and experimental research on noise prediction are needed. Topics covered include the elements of the noise prediction problem which are incorporated in ANOPP, results of comparisons of ANOPP calculations with measured noise levels, and progress toward treating noise as a design constraint in aircraft system studies.


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    Title :

    Nasa Progress in Aircraft Noise Prediction


    Contributors:
    J. P. Raney (author) / S. L. Padula (author) / W. E. Zorumski (author)

    Publication date :

    1981


    Size :

    40 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    NASA progress in aircraft noise prediction

    Raney, J. P. / Padula, S. L. / Zorumski, W. E. | NTRS | 1981


    NASA progress in aircraft noise prediction

    Raney, J. P. / Padula, S. L. / Zorumski, W. E. | NTRS | 1981



    NASA aircraft engine noise research.

    Kramer, J. J. / Dorsch, R. G. | NTRS | 1972