考虑轴向张力时变效应的圆柱体涡激振动响应特性研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (9) : 80-87.

论文

袁昱超1,2，薛鸿祥1,2，唐文勇1,2

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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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文章历史 +

摘要

借助时域流体力分解模型，本文开展时变轴向张力与涡激振动联合激励下圆柱体动力响应特性研究。采用某2.552m小尺度立管模型试验结果验证本文方法在顶张力恒定和时变条件下预报结构响应的有效性。针对另一尺度较大的38m圆柱体模型，设计28个张力时变工况以研究时变张力幅值和频率对涡激振动响应的影响规律。张力时变工况中，结构动力响应呈现振幅调制、滞后、频率转换及多频响应叠加、模态阶跃等不同于张力恒定工况的新特征。当时，结构会发生强烈的Mathieu型共振。

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.

导出引用

袁昱超1,2，薛鸿祥1,2，唐文勇1,2. 考虑轴向张力时变效应的圆柱体涡激振动响应特性研究[J]. 振动与冲击, 2019, 38(9): 80-87

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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