Empirical mode analysis identifying hysteresis in vortex-induced vibrations of a bending-dominated flexible cylinder
Date of Original Version
In this paper, we experimentally investigate flexible cylinder multimodal responses and their corresponding frequency variations in vortex-induced vibrations. In the experiments, we test the response of a bending-dominated flexible cylinder under uniform flow conditions between the Reynolds numbers of 1600 and 4700 and examine the response for potential hysteretic effects. We study the nonlinear modal interactions by means of analyzing the spatial response using a multivariate analysis technique called generalized smooth orthogonal decomposition (GSOD). Results of this study show that 1:1 (in-line to cross-flow) frequency ratios appear in one branch of a hysteresis region and 2:1 frequency ratios appear along a different branch and outside of the hysteresis regime. In addition, GSOD-based modal frequency response curves identify a subcritical Hopf bifurcation in the first two modal oscillations.
International Journal of Offshore and Polar Engineering
Gedikli, Ersegun D., David Chelidze, and Jason Dahl. "Empirical mode analysis identifying hysteresis in vortex-induced vibrations of a bending-dominated flexible cylinder." International Journal of Offshore and Polar Engineering 30, 2 (2020): 186-193. doi:10.17736/ijope.2020.mt27.