海洋输液立管涡激振动响应及其疲劳寿命研究.pdf

文档介绍：第 22 卷第 4 期工程力学
2005 年 8 月 ENGINEERING MECHANICS Aug. 2005
文章编号:1000-4750(2005)04-0220-05

海洋输液立管涡激振动响应及其疲劳寿命研究


*郭海燕,傅强,娄敏
(中国海洋大学工程学院,山东青岛 266071)

摘要:以 Francis Biolley 改进的 van der Pol 尾流振子模型为基础,考虑管内流动流体和管外海洋环境荷载共同
作用,建立了海洋立管涡激振动微分方程,用 Hermit 插值函数对立管微分方程进行离散,并用 Miner 理论对立管
的疲劳寿命进行分析,通过编程和实例计算,分析了管内流速对涡激响应幅值和疲劳寿命的影响。结果表明,当
管内流体流速变化使立管的固有频率接近漩涡脱落频率时,立管涡激振动响应将会增大,疲劳寿命将会显著减少。
关键词:海洋立管;涡激振动;管内流体;动力响应;疲劳寿命
中图分类号: 文献识别码:A

VORTEX-INDUCED VIBRATIONS AND FATIGUE LIFE OF MARINE
RISERS CONVEYING FLOWING FLUID

*GUO Hai·yan , FU Qiang , LOU Min
(School of Engineering, Ocean University of China, Qingdao 266071, China)

Abstract: Based on Biolley‘s wake oscillator model, the differential equation for the response of the
vortex-induced vibrations (VIV) of the riser is derived. The effect of the internal flowing fluid and the external
marine environmental condition are taken into account. The effect of the internal flowing fluid on the response of
VIV of the riser is studied using finite-element method. The fatigue life of the marine riser is analyzed by Miner’s
theory. The effect of the internal flow velocity on the response of VIV and the fatigue life of the riser is analyzed.
Results show that when the natural frequency of the riser is near the vortex shedding frequency due to the change
of initial velocit