ANALYSIS OF VORTEX-INDUCED VIBRATIONS BY FINITE ELEMENT METHOD

This paper studies the computation of vortex-induced responses by finite element models. The strip hypothesis in conjunction with the second Scanlan's vortex shedding half-empirical and half-analytical model are employed to discretize the vortex-excitation force in both time and space. An Alternating Time Frequency (AFT) domain method is developed to solve the assembled equations of motion in order to account for the mixed non-linear time-frequency terms that are evoked by the complex wake-structure interaction process in vortex-shedding excitations. The proposed approach is shown to be more flexible than the traditional methods adopting continuous models or stochastic approaches.