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Interior noise in the untreated Gulfstream II Propfan Test Assessment (PTA) aircraftInterior noise on the Gulfstream II Propfan Test Assessment (PTA) aircraft was measured using 19 wing, 22 fuselage, and 32 cabin-interior microphones to determine the sources of the cabin noise. Results from ground and flight test acoustic and vibration measurements and analyses show that the major source of cabin noise was the airborne propfan blade passage frequency tones. The radiated sound pressure levels and the richness of the harmonic content of the propfan increased with increasing altitude. The acoustic output of the propfan also depended on the shaft power, helical Mach number, and blade passage frequency.
Document ID
19890046383
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kuntz, H. L.
(Lockheed Aeronautical Systems Co. Burbank, CA, United States)
Prydz, R. A.
(Lockheed Aeronautical Systems Co., Kelly Johnson Research and Development Center Burbank, CA, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1989
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
AIAA PAPER 89-1119
Accession Number
89A33754
Funding Number(s)
CONTRACT_GRANT: NAS3-24339
Distribution Limits
Public
Copyright
Other

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