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Noise-reduction measurements of stiffened and unstiffened cylindrical models of an airplane fuselageNoise-reduction measurements are presented for a stiffened and an unstiffened model of an airplane fuselage. The cylindrical models were tested in a reverberant-field noise environment over a frequency range from 20 Hz to 6 kHz. An unstiffened metal fuselage provided more noise reduction than a fuselage having the same sidewall weight divided between skin and stiffening stringers and ring frames. The addition of acoustic insulation to the models tended to smooth out the interior-noise spectrum by reducing or masking the noise associated with the structural response at some of the resonant frequencies.
Document ID
19840010984
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Willis, C. M. (NASA Langley Research Center Hampton, VA, United States)
Mayes, W. H. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
February 1, 1984
Subject Category
Acoustics
Report/Patent Number
L-15699
NASA-TM-85716
NAS 1.15:85716
Accession Number
84N19052
Funding Number(s)
PROJECT: RTOP 505-33-53-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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