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Vibroacoustic testing of Space Shuttle thermal protection system panelsThe modes and acoustic responses of two panels representing Space Shuttle thermal protection panels were investigated. The panels consisted of flat aluminum sheet stiffened longitudinally with hat-section stringers and corrugated supporting panels representing Shuttle ring frame bulkheads. In addition, one panel had 24 tiles of LI900 silica thermal insulation material and a strain isolator pad bonded to the face sheet. Both panels were found to have approximately eight modal frequencies in the 60 to 500 Hz range, where Shuttle acoustic loads are expected to be high. The strain response to a progressive acoustic wave representing a Shuttle spectrum was characterized by the occurrence of larger strains in the direction normal to the stringers than in the direction parallel to the stringers; three modes in the 100 to 400 Hz range contributed significantly to the strain response.
Document ID
19760047066
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Rucker, C. E.
(NASA Langley Research Center Hampton, VA, United States)
Mixson, J. S.
(NASA Langley Research Center Hampton, Va., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Subject Category
Engineering (General)
Meeting Information
Meeting: Structures, Structural Dynamics, and Materials Conference
Location: King of Prussia, PA
Start Date: May 5, 1976
End Date: May 7, 1976
Accession Number
76A30032
Distribution Limits
Public
Copyright
Other

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