Finite-Element Vibration Analysis and Modal Testing of Graphite Epoxy Tubes and Correlation Between the Data
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Page : 70 pages
File Size : 43,2 MB
Release : 1996
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Page : 70 pages
File Size : 43,2 MB
Release : 1996
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Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 68 pages
File Size : 44,60 MB
Release : 2018-07-08
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ISBN : 9781722398026
Structural materials in the form of graphite epoxy composites with embedded rubber layers are being used to reduce vibrations in rocket motor tubes. Four filament-wound, graphite epoxy tubes were studied to evaluate the effects of the rubber layer on the modal parameters (natural vibration frequencies, damping, and mode shapes). Tube 1 contained six alternating layers of 30-degree helical wraps and 90-degree hoop wraps. Tube 2 was identical to tube 1 with the addition of an embedded 0.030-inch-thick rubber layer. Tubes 3 and 4 were identical to tubes 1 and 2, respectively, with the addition of a Textron Kelpoxy elastomer. This report compares experimental modal parameters obtained by impact testing with analytical modal parameters obtained by NASTRAN finite-element analysis. Four test modes of tube 1 and five test modes of tube 3 correlate highly with corresponding analytical predictions. Unsatisfactory correlation of test and analysis results occurred for tubes 2 and 4 and these comparisons are not shown. Work is underway to improve the analytical models of these tubes. Test results clearly show that the embedded rubber layers significantly increase structural modal damping as well as decrease natural vibration frequencies. Taleghani, Barmac K. and Pappa, Richard S. Langley Research Center...
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Page : 492 pages
File Size : 40,79 MB
Release : 1994
Category : Aeronautics
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Page : 888 pages
File Size : 19,70 MB
Release : 1998
Category : Government publications
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Page : 456 pages
File Size : 35,87 MB
Release : 1995
Category : Aeronautics
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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Page : 180 pages
File Size : 48,68 MB
Release : 1997
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Page : 342 pages
File Size : 49,5 MB
Release : 1991
Category : Large space structures (Astronautics)
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Page : 688 pages
File Size : 13,29 MB
Release : 1983
Category : Large space structures (Astronautics)
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Page : 400 pages
File Size : 12,45 MB
Release : 1948
Category : Mechanics, Applied
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Page : 980 pages
File Size : 46,5 MB
Release : 1998
Category : Aeronautics
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