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文章介绍了立管在不同流剖面下的涡激振动实验,然后给出了简支钢悬链线的静态方程和基于能量平衡原理的涡激振动频域预报理论。之后提出把钢悬链的参数转化为顶部张紧钻井隔水管的参数的思想。通过预报顶部张紧钻井隔水管的涡激振动响应,得到钢悬链线的涡激振动响应。文中还研究了不同的顶部预张力和不同流剖面对钢悬链线的涡激振动响应影响。结果表明立管的固有频率和模态数的关系是线性的,并且立管的均方根位移和激励的模态数不仅与流速的大小和变化范围有关,还与顶部预张力有关。
In this paper, the vortex-induced vibration experiments of risers under different flow profiles are introduced. Then, the static equations of simply supported steel catenaries and the prediction theory of vortex-induced vibration in frequency domain are given. After that, the idea of converting the parameters of steel catenary into the parameter of top tension drilling riser was put forward. The vortex-induced vibration response of steel catenary is obtained by predicting the vortex-induced vibration response of top-tensioned drilling riser. The effects of different top pre-tension and different flow profiles on the vortex-induced vibration response of steel catenary are also studied. The results show that the relationship between the natural frequency of the riser and the mode number is linear, and the root mean square displacement of standpipe and the number of excited modes are not only related to the size and range of flow rate but also to the top pre-tension.