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Flexibility investigation of a marine riser system based on an accurate and efficient modelling and flexible multibody dynamics

机译：基于准确高效建模和灵活多体动力学的海车系统的灵活性研究

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摘要

The flexibility of marine riser systems in deepwater settings is studied using flexible multibody dynamics with geometrically exact beam for static, eigen and recoil analyses. The aim is to form an accurate and efficient modelling method and the corresponding solution strategies/algorithms for considering the spatial flexibility of the marine riser and movable constraints simultaneously, where the former is usually oversimplified in rigid multibody dynamics based works and the latter is inefficient in the finite element method based works. Therefore, a geometrically exact beam with the Euler's rotation vector is adopted for the marine riser, and its uniform formulation with rigid bodies is presented together with the preconditioning and solving strategies in static, eigen and recoil cases. Some other technical details for speeding up the algorithm are also described, such as parallelisation, matrix sparsity and variable step size control. To verify the present algorithm, a model with a depth of 1547 m based on a real platform is built, here considering the hydrostatic and hydrodynamic loads on riser, hydro-pneumatic tensioner and platform motion. The numerical results are compared with the commercial software Deepriser, and up to 93% coincidence is obtained in all cases with six times speedup is achieved. In addition, an extended model with more details of the real system obtained by considering independent modelling of auxiliary lines is simulated in the recoil analysis with the presented algorithm, and the results show that ignoring the stiffness of the auxiliary lines in the traditional method and commercial software may lead to incorrect conclusions regarding the tension safety of the marine riser.
机译：使用柔性多体动力学研究了深水环境中的海上立管系统的灵活性，具有静态，尖端和反冲分析的几何精确光束。目的是形成准确有效的建模方法和相应的解决方案策略/算法，用于同时考虑海上提升管和可移动限制的空间灵活性，其中前者通常在基于刚性多体动力学的作品中超薄化，后者效率低下基于有限元方法的作品。因此，采用具有欧拉旋转载体的几何精确光束用于海上提升管，其与刚体的均匀配方与静电，eIGen和反冲病例中的预处理和求解策略一起呈现。还描述了用于加速算法的其他一些技术细节，例如平行化，矩阵稀疏性和可变步长控制。为了验证本算法，建立了基于真实平台的深度为1547米的模型，考虑到提升管，水气动张紧器和平台运动的静水和流体动力载荷。将数值结果与商业软件Deepriser进行比较，在达到六次加速的所有病例中获得了高达93％的巧合。另外，通过考虑通过考虑算法的Recoil分析中考虑独立建模而获得的具有更多实际系统细节的扩展模型，结果表明，忽略了传统方法和商业中辅助线的刚度软件可能导致对海洋提升管的紧张安全性的结论不正确。

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