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An evaluation of Space Shuttle STS-2 payload bay acoustic data and comparison with predictionsSpace average sound pressure levels computed from measurements at 18 locations in the payload bay of the Space Shuttle orbiter vehicle during the STS-2 launch were compared with predicted levels obtained using the PACES computer program. The comparisons were performed over the frequency range 12.5 Hz to 1000 Hz, since the test data at higher frequencies are contaminated by instrumentation background noise. In general the PACES computer program tends to overpredict the space average sound levels in the payload bay, although the magnitude of the discrepancy is usually small. Furthermore the discrepancy depends to some extent on the manner in which the payload is modeled analytically, and the method used to determine the "measured' space average sound pressure levels. Thus the difference between predicted and measured sound levels, averaged over the 20 one third octave bands from 12.5 Hz to 1000 Hz, varies from 1 dB to 3.5 dB.
Document ID
19830004877
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Wilby, J. F.
(Bolt, Beranek, and Newman, Inc. Canoga Park, CA, United States)
Piersol, A. G.
(Bolt, Beranek, and Newman, Inc. Canoga Park, CA, United States)
Wilby, E. G.
(Bolt, Beranek, and Newman, Inc. Canoga Park, CA, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1982
Subject Category
Space Transportation
Report/Patent Number
NAS 1.26:170451
NASA-CR-170451
BBN-4748
Accession Number
83N13148
Funding Number(s)
CONTRACT_GRANT: NAS5-26570
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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