Publication:
Transverse vibrations of a composite cylindrical tube of circular cross section.

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Authors
Etter, Raymond William
Subjects
composite
shell
laminate
modal analysis
vibration tube
Euler-Bernoulli
laminated plate
laminated shell
Advisors
Gorman, Michael R.
Date of Issue
1989-09
Date
September 1989
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The transverse frequencies of vibration of laminated orthotropic cylindrical shells were studied in order to compare experimental results with results predicted by a modified Euler-Bernoulli beam theory. The structures studied had circular cross sections and were made of graphite/epoxy. Stacking sequence for the test structures were [90,╤60₃, 90] and [90,╤45₃, 90]. The structures were tested under clamped-free boundary conditions. Testing was conducted by measuring the Frequency Response Function (FRF) of the structure after exciting it with an impulse from a modal hammer. Response was measured using an accelerometer. Signal processing was done with a digital signal analyzer and FRFs were analyzed using modal analysis software. The experimental data were used to derive a modal model of the test structure. Analytical predictions were made by one dimensionalizing the two dimensional laminated plate theory equations of motion. Treatment of the test structures as a beam was justified by investigating the equations of motion of classical shell theory and making physically reasonable assumptions.
Type
Thesis
Description
Series/Report No
Department
Aeronautics and Astronautics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
102 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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