振荡来流下柔性立管涡激振动“分时特性”试验研究

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 1-7.

论文

振荡来流下柔性立管涡激振动“分时特性”试验研究

王俊高，付世晓，许玉旺，宋磊建

作者信息 +

Experimental Investigation on “Time Sharing” of Vortex-Induced Vibration of a Flexible Cylinder in Oscillatory Flow

Jungao Wang Shixiao Fu* Yuwang Xu Leijian Song

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文章历史 +

摘要

悬链线立管在顶部浮体的带动下，其动力响应会诱发其周围产生相对来流，而这种振荡来流将激励立管悬垂段产生“间歇性”的涡激振动。在海洋工程水池中对不同最大约化速度、数组合下的振荡来流作用下的柔性立管进行模型试验研究，利用光纤应变片测量柔性立管模型的涡激振动响应。结合模态分析与小波分析对试验数据进行分析，观察到一种区别于定常来流下的涡激振动响应形式，即具有“振幅调制”及“模态转换”的“分时特性”的涡激振动。最后讨论并总结了最大约化速度以及数对涡激振动“分时特性”的影响规律。

Abstract

Under the top vessel motions, dynamic responses of the catenary risers would generate relatively oscillatory flow around themselves. Such oscillatory flow would easily trigger the ‘intermittent VIV’ at sag-bend part of the riser. This paper mainly focuses on the experimental investigations on the behaviors of a flexible cylinder in oscillatory flow with different combinations of both maximum reduced velocity and number. Fiber Brag Grating (FBG) strain sensors were used to measure the VIV response of the model cylinder. Then, modal analysis and wavelet analysis were adopted to deal with the experimental data, and VIV response featured of “time sharing” including “amplitude modulation” and “mode transition” was observed which is distinguished from that in steady flow. Finally, the effects on “time sharing” of VIV in oscillatory flow from both reduced velocity and number were discussed and summarized.

导出引用

王俊高;付世晓;许玉旺;宋磊建. 振荡来流下柔性立管涡激振动“分时特性”试验研究[J]. 振动与冲击, 2014, 33(21): 1-7

Jungao Wang Shixiao Fu* Yuwang Xu Leijian Song. Experimental Investigation on “Time Sharing” of Vortex-Induced Vibration of a Flexible Cylinder in Oscillatory Flow[J]. Journal of Vibration and Shock, 2014, 33(21): 1-7