Title

Empirical mode analysis identifying hysteresis in vortex-induced vibrations of a bending-dominated flexible cylinder

Document Type

Article

Date of Original Version

1-1-2020

Abstract

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.

Publication Title

International Journal of Offshore and Polar Engineering

Volume

30

Issue

2

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