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Validation of helicopter noise prediction techniquesThe current techniques of helicopter rotor noise prediction attempt to describe the details of the noise field precisely and remove the empiricisms and restrictions inherent in previous methods. These techniques require detailed inputs of the rotor geometry, operating conditions, and blade surface pressure distribution. The purpose of this paper is to review those techniques in general and the Farassat/Nystrom analysis in particular. The predictions of the Farassat/Nystrom noise computer program, using both measured and calculated blade surface pressure data, are compared to measured noise level data. This study is based on a contract from NASA to Bolt Beranek and Newman Inc. with measured data from the AH-1G Helicopter Operational Loads Survey flight test program supplied by Bell Helicopter Textron.
Document ID
19810017232
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Succi, G. P.
(Bolt, Beranek, and Newman, Inc. Cambridge, MA, United States)
Date Acquired
September 4, 2013
Publication Date
April 1, 1981
Subject Category
Acoustics
Report/Patent Number
NASA-CR-165715
Accession Number
81N25768
Funding Number(s)
CONTRACT_GRANT: NAS1-15740
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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