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建立了柔性杆件在非均匀流作用下的涡激振动响应预测模型,考虑了涡激振动锁频阶段流体附加质量的变化,以及振动响应和来流简缩速度的非线性关系。该模型通过经验公式结合迭代求解的方式,计算方便、速度快,避免了数值计算(CFD)的繁琐,较为适合于海洋工程实际应用。与试验和数值结果的比较表明采用该文提出的计算模型,可以更合理、准确地给出结构涡激振动响应。最后,结合实际平台参数,进行了柔性立管在非均匀流场的作用下的涡激振动响应分析,并研究了立管的预张力、流场分布等参数的影响。分析结果表明:随着立管张力和流场分布的改变,各阶模态锁频区域发生了变化,从而改变了结构的总体响应
The vortex-induced vibration response prediction model of the flexible rod under non-uniform flow is established. The change of the additional mass of fluid during the phase-locking of the vortex-induced vibration and the nonlinear relationship between the vibration response and the velocity of the flow reduction are considered. The model is combined with the iterative solution through empirical formula, which is easy to calculate and fast, avoids the cumbersome of numerical calculation (CFD) and is more suitable for the practical application of marine engineering. Compared with the experimental results and numerical results, it is shown that the vortex-induced vibration response of the structure can be given more reasonably and accurately by using the calculation model proposed in this paper. Finally, the vortex-induced vibration response of the flexible riser under non-uniform flow field is analyzed based on the actual platform parameters. The influence of pre-tension and flow field distribution on the riser is studied. The analysis results show that with the change of riser tension and flow field, the mode-locked frequency bands of different modes have changed, thus changing the overall structure response