Time Domain Analysis Approach for Riser Vortex-Induced Vibration Based on Forced Vibration Test Data
Time Domain Analysis Approach for Riser Vortex-Induced Vibration Based on Forced Vibration Test Data
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DOI：
10.1115/omae2013-10285
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
Kunpeng Wang;Wenyong Tang;Hong-xiang Xue
中科院分区：
文献类型：
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作者：
Kunpeng Wang;Wenyong Tang;Hong-xiang Xue
随着油气勘探和生产向深水领域推进，海洋工业面临着立管涡激振动（VIV）的更多挑战。尽管频域方法已广泛用于立管 VIV 预测和疲劳设计，但仍需要做出一些假设。此外，频域方法无法考虑可变水流和立管非线性边界条件，例如顶部边界响应、船体立管和导轨之间的相互作用以及土壤-SCR 相互作用。考虑到上述情况，已经开发了几种时域代码用于立管横流（CF）VIV 预测。本文提出了一种基于强制算法的时域方法。激振力源自受迫振动测试的无量纲振幅和频率相关升力系数。水动力阻尼模型由经验模型和升力曲线的延伸组成。在每一步中，将获得每个元件的位移和速度，以计算升力系数和阻尼的响应幅度和频率。除CF VIV外，还考虑了平均阻力，该平均阻力将被CF VIV放大。采用该方法对Delft Hydrome的Delta Flume模型试验进行了模拟，并预测了CF VIV响应和平均阻力位移。结果与测量数据吻合良好。版权所有 © 2013 by ASME
As oil and gas exploration and production are pushed into deepwater area, the offshore industry is facing more challenges for riser vortex induces vibration (VIV). Although frequency domain approach has been widely used for the riser VIV prediction and fatigue design, several assumptions need to be made. In addition, frequency domain approach cannot account for the variable current and riser nonlinear boundary conditions, such as top boundary response, the interaction between riser and guides in the hull and soil-SCR interaction.Considering above cases, several time domain codes have been developed for riser cross-flow (CF) VIV prediction. This paper presents a time domain approach based on forced algorithm. The exciting force is derived from the non-dimensional amplitude and frequency dependent lift coefficients from forced vibration test. The hydrodynamic damping model consists of empirical model and the extension of the lift curves. At each step, the displacement and velocity of each element would be obtained to calculate the response amplitude and frequency for the lift coefficient and damping. Expect for CF VIV, the mean drag force is also considered, which would be magnified by CF VIV.The model test at Delta Flume of Delft Hydraulics is simulated using the proposed approach, and the CF VIV responses and the mean drag displacement are predicted. The results match well with the measured data.Copyright © 2013 by ASME