Transverse Vibrations of a Composite Cylindrical Tube of Circular Cross Section.

摘要

The transverse frequencies of vibration of laminated orthotropic cylindrical shells were studied in order to compare experimental results with results predicted by p a modified Euler-Bernoulli beam theory. The structures studied had circular cross sections and were made of graphite/epoxy. Stacking sequences for the test structures were (90, + or - 603,90) and (90, + or -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 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 p the equations of motion of classical shell theory and making physically reasonable assumptions. Composite, Shell, Laminate, Modal analysis, Vibration tube, Euler-Bernoulli, Laminated plate, Laminated shell, Thesis, Mechanics, Transverse vibration, Test and evaluation, Spacecraft components. (jg)