基于原尺寸建模的水下管汇碰撞数值模拟研究

Numerical Simulation of Subsea Manifold Collision Based on Full-scale Modeling

海上坠物的撞击直接影响水下管汇的工作稳定性,开展坠物冲击下水下管汇的动力学分析能够为其结构设计提供依据以及提高水下管汇生产安全性。而基于非全尺寸模型的水下管汇动力学分析方法存在分析结果精度受损的问题。为此,建立水下管汇全尺寸有限元模型以开展动力学分析,考虑不同形状和质量的坠物对水下管汇造成冲击的影响不同,建立多种坠物类型模型,并开展仿真实验。结果表明:球体坠物对水下管汇造成的损伤程度最高、霍尔锚坠物次之、圆管坠物造成的损伤程度最低。进一步地,考虑到坠物撞击角度不同对水下管汇造成的损伤程度不同,结合坠物坠落规律,分别采用圆管横向和圆管纵向与水下管汇进行碰撞动力学分析。结果表明:坠物质量相同时,接触面积越小损伤程度越大;坠物类型相同时,坠物质量越大造成的损伤程度越高。

The impact of falling objects on the sea directly affects the working stability of the subsea manifold.The dynamic analysis of the impact of falling objects on the subsea manifold can provide a basis for its structural design and improve the production safety of the subsea manifold.However,the problem that the precision of the analysis results was damaged by the dynamic analysis method of subsea manifold based on the non full size model.Therefore,a full size finite element model of subsea manifold was established for dynamic analysis.Considering the impact of falling objects of different shapes and masses on the subsea manifold,several models of falling objects were established for simulation experiments.The results show that the sphere falling objects cause the highest damage to the subsea manifold,the damage degree caused by hall anchor is the second,and that caused by round pipe is the lowest.Furthermore,considering the different degrees of damage caused to subsea manifolds due to different impact angles of falling objects,combined with the falling objects′falling rules,the impact dynamics analysis of subsea manifolds were carried out by using the horizontal and vertical direction of tubes respectively.The results show that the smaller the contact area is,the greater the damage degree is when the falling objects have the same mass;the greater the mass is,the higher the damage degree is when the falling objects have the same type.