1.State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2.Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China
With the help of time domain force-decomposition model, cylinders’ dynamic response characteristics under combined excitation of time-varying axial tension and vortex-induced vibration (VIV) are investigated in this paper. The test results of a small-scale (2.552m) riser model are utilized to validate the adopted approach under constant and time-varying top-end tension situations. For another relatively long (38m) cylinder model, 28 cases with time-varying tension are designed to investigate the influence laws of varying tension amplitude and frequency on VIV response for cylinders. The structural response with time-varying tension presents some different features, i.e. amplitude modulation, hysteresis, frequency transition, multi-frequencies response superposition and mode jump, from those under constant tension situation. When , Mathieu-type resonance will be excited significantly.
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