NDLI: Nasa progress in aircraft noise prediction

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Nasa progress in aircraft noise prediction

Content Provider	NASA Technical Reports Server (NTRS)
Author	Padula, S. L. Raney, J. P. Zorumski, W. E.
Copyright Year	1981
Description	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.
File Size	1757793
Page Count	48
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19810012301
Archival Resource Key	ark:/13960/t95767p68
Language	English
Publisher Date	1981-03-01
Access Restriction	Open
Subject Keyword	Acoustics Nasa Programs Effective Perceived Noise Levels Sound Propagation Power Spectra Jet Aircraft Noise Noise Reduction Noise Prediction Aircraft Atmospheric Attenuation Aerodynamic Noise Aircraft Design Takeoff Computer Programs Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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