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Acoustically swept rotorImpulsive noise reduction is provided in a rotor blade by acoustically sweeping the chord line from root to tip so that the acoustic radiation resulting from the summation of potential singularities used to model the flow about the blade tend to cancel for all times at an observation point in the acoustic far field.
Document ID
19800005851
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Schmitz, F. H. (NASA Ames Research Center Moffett Field, CA, United States)
Boxwell, D. A. (NASA Ames Research Center Moffett Field, CA, United States)
Vause, R. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
September 25, 1979
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
Patent Number: US-PATENT-4,168,939
Patent Application Number: US-PATENT-APPL-SN-831633
Patent Number: NASA-CASE-ARC-11106-1
Accession Number
80N14107
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,168,939|NASA-CASE-ARC-11106-1
Patent Application
US-PATENT-APPL-SN-831633

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