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Airframe self-noise: Four years of researchA critical assessment of the state of the art in airframe self-noise is presented. Full-scale data on the intensity, spectra and directivity of this noise source are evaluated in the light of the comprehensive theory developed by Ffowcs-Williams and Hawkins. Vibration of panels on commercial aircraft is identified as a possible additional source of airframe noise. The present understanding and methods for prediction of other component sources - airfoils, struts, and cavities - are discussed, and areas for further research as well as potential methods for airframe noise reduction are identified. Finally, the various experimental methods which have been developed for airframe noise research are discussed and sample results are presented.
Document ID
19760021869
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Hardin, J. C. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1976
Subject Category
Acoustics
Report/Patent Number
NASA-TM-X-73908
Accession Number
76N28957
Funding Number(s)
PROJECT: RTOP 505-06-23-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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