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首页> 外文期刊>Ocean Engineering >An experimental investigation on concomitant Vortex-Induced Vibration and axial top-motion excitation with a long flexible cylinder in vertical configuration
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An experimental investigation on concomitant Vortex-Induced Vibration and axial top-motion excitation with a long flexible cylinder in vertical configuration

机译：垂直构型的长挠性圆柱体伴随涡旋振动和轴向上运动的实验研究

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摘要

An experimental investigation of concomitant Vortex-Induced Vibration (VIV) and top-motion excitation with a long and vertical flexible cylinder is presented. Underwater optical instrumentation allows to directly measure the cartesian coordinates of 43 targets placed along the model. Standard analyses, based on statistical evaluation of local displacement time-histories and on spectral analysis, are carried out. Additionally to the standard approach, modal decomposition is adopted, allowing to obtain modal-amplitude time-histories. It was found that the concomitant VIV and top-motion excitation significantly affects the flexible cylinder response when compared to the pure VIV tests. When the top-motion excitation has frequency twice the first natural frequency in still water (f(t) f(N,1) = 2 : 1), parametric instability of the first vibration mode occurs concomitant to VIV phenomenon. Such instability leads to a marked increase in the oscillation amplitudes for the whole range of towing speed tested.
机译：提出了在长而垂直的柔性圆柱体的伴随下的涡激振动（VIV）和顶部运动激励的实验研究。水下光学仪器可以直接测量沿模型放置的43个目标的笛卡尔坐标。基于局部位移时程的统计评估和光谱分析，进行标准分析。除标准方法外，还采用模态分解，从而获得模态幅度时程。发现与纯VIV测试相比，伴随的VIV和上运动激励显着影响了柔性气缸的响应。当最高运动激励的频率是静止水中的第一自然频率的两倍（f（t）f（N，1）= 2：1）时，伴随VIV现象出现第一振动模式的参数不稳定性。这种不稳定性导致在所测试的拖曳速度的整个范围内振荡幅度明显增加。

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