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Analytical and experimental vibration studies of a 1/8-scale shuttle orbiterNatural frequencies and mode shapes for four symmetric vibration modes and four antisymmetric modes are compared with predictions based on NASTRAN finite-element analyses. Initial predictions gave poor agreement with test data; an extensive investigation revealed that the major factors influencing agreement were out-of-plane imperfections in fuselage panels and a soft fin-fuselage connection. Computations with a more refined analysis indicated satisfactory frequency predictions for all modes studied, within 11 percent of experimental values.
Document ID
19760009409
Document Type
Other - NASA Technical Note (TN)
Authors
Pinson, L. D.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1975
Subject Category
Structural Mechanics
Report/Patent Number
L-9806
NASA-TN-D-7964
Funding Number(s)
PROJECT: RTOP 506-17-32-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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