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Trends in aircraft noise controlFlight vehicles are characterized according to their manner of operation and type of propulsion system; and their associated sources of noise are identified. Available noise reduction technology as it relates to engine cycle design and to powerplant component design is summarized. Such components as exhaust jets, fans, propellers, rotors, blown flaps, and reciprocating-engine exhausts are discussed, along with their noise reduction potentials. Significant aircraft noise reductions are noted to have been accomplished by the application of available technology in support of noise certification rules. Further noise reductions to meet more stringent future noise regulations will require substantial additional technology developments. Improved analytical prediction methods, and well-controlled validation experiments supported by advanced-design aeroacoustic facilities, are required as a basis for an effective integrated systems approach to aircraft noise control.
Document ID
19750020935
Document Type
Conference Paper
Authors
Hubbard, H. H. (NASA Langley Research Center Hampton, VA, United States)
Conrad, E. W. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Publication Information
Publication: NASA/Univ. Conf. on Aeron.
Subject Category
AIRCRAFT PROPULSION AND POWER
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19750020928Analytic PrimaryNASA/University Conference on Aeronautics
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