Free Vibration Analysis of Anisotropic Thin-Walled Closed-Section Beams

摘要

The equations of motion for the free vibration analysis of anisotropic thin-walled closed-suction beams are derived using a variational asymptotic approach and Hamilton's principle. The analysls is applied to two laminated composite constructions. The circumferentially uniform stiffness produces extension-twist coupling and the circumferentially asymmetric stiffness produces bending-twist ctnipltng. The effect of the eliwtle coupling medmnisms on the vibration behavior of thin-walled composite bourns is evaluated auiilyticnily. The iiiiluence of stacking orientation on the frequencies associated with coupled vibration modes is investigated. The predictions are validated by comparison with n finite dement simulation and lest data.