多向流环境中悬链线立管涡激振动疲劳特性研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (12) : 37-47.

振动理论与交叉研究

多向流环境中悬链线立管涡激振动疲劳特性研究

李星辉1,2，冯琛涵1，袁昱超*1,3，郭力1，唐文勇1

作者信息 +

Vortex-induced vibration fatigue characteristics of catenary riser in multidirectional flow environment

LI Xinghui1,2，FENG Chenhan1，YUAN Yuchao*1,3，GUO Li1，TANG Wenyong1

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文章历史 +

摘要

海流作用下的涡激振动是海洋立管疲劳损伤积累的主要原因。实际海洋环境中，海流流向并非恒定不变，而是呈现多向流的特征。多向流环境中悬链线立管所处平面的方向对涡激振动响应有不可忽视的影响。基于涡激振动数值预报模型和多向流中结构疲劳评估方法，计算了外流流向和流速变化时立管的涡激振动疲劳损伤，并分析了季节性差异显著、不显著多向流环境中涡激振动疲劳特性。结果表明：多向流环境中立管面内模态和面外模态在响应中共存竞争时涡激振动疲劳损伤较小。疲劳损伤与外流流速之间的关系可用幂函数或双重指数函数近似拟合。季节性差异不显著时，疲劳损伤随立管布置方向变化剧烈；季节性差异显著时，疲劳损伤随立管布置方向变化平缓。通过数值计算使立管所处平面与多向流主导流向呈特定夹角可以有效减小涡激振动疲劳损伤。

Abstract

Vortex-induced vibration (VIV) under the action of ocean currents is a primary cause of fatigue damage accumulation in marine risers. In actual marine environments, the flow direction of ocean currents is not constant but exhibits characteristics of multidirectional flow. In multidirectional flows, the orientation of the plane in which the catenary riser is located has a significant impact on the VIV response. Based on a numerical prediction model for VIV and a fatigue assessment method for structures in multidirectional flows, the fatigue damages of the riser in flows with different directions and velocities were calculated, and the VIV fatigue characteristics in multidirectional flows with significant and non-significant seasonal differences were analyzed. The results indicate that when in-plane and out-of-plane modes coexist and compete in the response within a multidirectional flow environment, the VIV fatigue damage is relatively small. The relationship between fatigue damage and the velocity of the external flow can be approximated by a power function or a double exponential function. When seasonal differences are not significant, fatigue damage varies dramatically with changes in the orientation of the riser; when seasonal differences are significant, fatigue damage varies more smoothly with changes in the orientation of the riser. Numerical calculations show that aligning the plane in which the riser is located at a specific angle with the dominant direction of the multidirectional flow can effectively reduce the VIV fatigue damage.

导出引用

李星辉1, 2, 冯琛涵1, 袁昱超1, 3, 郭力1, 唐文勇1. 多向流环境中悬链线立管涡激振动疲劳特性研究[J]. 振动与冲击, 2025, 44(12): 37-47

LI Xinghui1, 2, FENG Chenhan1, YUAN Yuchao1, 3, GUO Li1, TANG Wenyong1. Vortex-induced vibration fatigue characteristics of catenary riser in multidirectional flow environment[J]. Journal of Vibration and Shock, 2025, 44(12): 37-47

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