Response characteristics of a cylinder&rsquo;s VIV considering time-varying axial tension effect

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (9) : 80-87.

Response characteristics of a cylinder’s VIV considering time-varying axial tension effect

YUAN Yuchao1,2， XUE Hongxiang1,2， TANG Wenyong1,2

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Abstract

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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Time-varying tension / Vortex-Induced Vibration / Response characteristics / Time domain

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YUAN Yuchao1,2， XUE Hongxiang1,2， TANG Wenyong1,2. Response characteristics of a cylinder’s VIV considering time-varying axial tension effect[J]. Journal of Vibration and Shock, 2019, 38(9): 80-87

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