不同频率比时立管两向涡激振动及疲劳分析

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (9) : 124-128.

论文

不同频率比时立管两向涡激振动及疲劳分析

唐世振; 黄维平; 刘建军; 邓跃

作者信息 +

Vortex induced vibration and fatigue damage of risers with two-degrees-of-freedom considering different frequency ratios

Tang Shi-zhen; Huang Wei-ping; LIU Jian-jun; DENG Yue

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文章历史 +

摘要

考虑四种不同频率比(流向荷载频率/横向荷载频率)情况下，立管两向涡激振动的幅值和疲劳的变化。结果表明：较低频率比且低约化速度条件下，流向自由度对横向振动具有一定的抑制作用；当6.3<约化速度<8.0时，考虑顺流向振动时横向振动幅值明显增加。随着频率比的增加，顺流向振动对横向振动的影响逐渐减弱。横向振动对顺流向振动的影响在四种情况下均较为显著，考虑横向振动时顺流向振动幅值急剧增大。两向自由度涡激振动的疲劳在低频率比时明显高于单自由度时的疲劳；顺流向振动疲劳随着频率比的增大受横向振动的影响越来越明显。

Abstract

The variation of response amplitude and fatigue damage of riser with two-degrees-of- freedom is proposed, considering four kinds of different frequency ratios (drag force frequency/lift force frequency). The results show that under a low frequency ratio and low reduced velocity, the in-line vibration will restrain the cross-flow vibration. And also with the 6.3< reduced velocity <8.0, the cross-flow amplitude will increase clearly considering the in-line vibration. With the increase of frequency ratio, the effect will be weakened. The cross-flow vibration influences the in-line vibration severely in all the cases. The in-line amplitude will increase evidently. The fatigue damage with two degrees is great lager than that with one degree with low frequency ratio. The fatigue in in-line direction is inclined to be influenced by the cross-flow vibration with a high frequency ratio.

导出引用

唐世振;黄维平;刘建军;邓跃. 不同频率比时立管两向涡激振动及疲劳分析[J]. 振动与冲击, 2011, 30(9): 124-128

Tang Shi-zhen;Huang Wei-ping;LIU Jian-jun;DENG Yue. Vortex induced vibration and fatigue damage of risers with two-degrees-of-freedom considering different frequency ratios[J]. Journal of Vibration and Shock, 2011, 30(9): 124-128