Abstract Axial dynamics of risers is one of challenges in offshore oil and gas engineering. Axial hydrodynamic loads on a riser system are often ignored in traditional analysis methods. To accurately analyze the axial dynamic response of risers, an improved axial dynamic analysis method of risers is proposed based on finite element method and data-driven models. Finite element method is introduced to analyze the structural response of risers while data-driven models are trained for the calculation of hydrodynamic loads through BP neural network. Finally, a comprehensive analysis algorithm is proposed for the axial dynamic analysis of risers by combining finite element method and data-driven models. The proposed method is demonstrated by its application to a case. It turns out that the hydrodynamic loads on key components have an obvious influence on axial dynamics of risers, especially the lower marine riser package (LMRP). The vibration amplitude of risers increases obviously and the vibration phase of risers presents a little lag with consideration of hydrodynamic loads. The detailed influence of hydrodynamic loads on axial dynamics of risers under different amplitudes and periods of platform motion and riser configurations is also studied based on the proposed method.

中文翻译：

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基于有限元方法和数据驱动模型的隔水管轴向动力分析改进

摘要 隔水管轴向动力学是海上油气工程面临的挑战之一。在传统的分析方法中，立管系统上的轴向水动力载荷常常被忽略。为准确分析隔水管的轴向动力响应，提出了一种基于有限元方法和数据驱动模型的隔水管轴向动力分析改进方法。引入有限元方法来分析立管的结构响应，同时训练数据驱动模型以通过BP神经网络计算水动力载荷。最后，结合有限元方法和数据驱动模型，提出了立管轴向动力分析的综合分析算法。所提出的方法通过其在案例中的应用得到了证明。事实证明，关键部件上的水动力载荷对立管的轴向动力学有明显的影响，尤其是下海立管组件（LMRP）。考虑水动力载荷，隔水管振动幅度明显增大，隔水管振动相位略有滞后。基于所提出的方法，还研究了在平台运动的不同幅度和周期以及隔水管配置下水动力载荷对隔水管轴向动力学的详细影响。