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Dynamics calculation for underwater moving slender bodies based on flexible segment model

机译：基于柔性管段模型的水下运动细长体动力学计算

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摘要

Long marine risers or cables are underwater slender bodies. In the case of being moved or towed by the mother vessels, they may undergo high tensions and moments with large deformations. To evaluate their underwater safeties, the dynamics calculation is often carried out. The paper provides a dynamics calculation method for underwater moving slender bodies (MSBs) based on a Flexible Segment Model (FSM). In FSM, a slender body is discretized into a series of flexible segments. For each flexible segment, its deflecting feature and external forces are analyzed independently. The deformation of the whole slender body is decomposed into micro-deformations of the flexible segments. And the governing equations are listed according to the moment equilibrium on these segments. A linear iteration scheme is provided to get the numerical solution to the governing equations. To verify the results of the proposed FSM based dynamics calculation method, the comparison between the numerical and experimental results is shown. The numerical results can agree with the experimental results very well if selecting suitable hydrodynamic coefficients.
机译：长的船用立管或电缆是水下细长体。在被母船移动或拖曳的情况下，它们可能会承受高张力和较大变形的力矩。为了评估其水下安全性，经常进行动力学计算。本文提供了一种基于柔性分段模型（FSM）的水下运动细长体（MSB）的动力学计算方法。在FSM中，细长的主体离散为一系列柔性段。对于每个柔性节段，其挠曲特征和外力都将进行独立分析。整个细长体的变形分解为柔性段的微变形。并根据这些段上的力矩平衡列出了控制方程。提供了线性迭代方案，以得到控制方程的数值解。为了验证所提出的基于FSM的动力学计算方法的结果，数值与实验结果进行了比较。如果选择合适的水动力系数，数值结果可以与实验结果非常吻合。

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