J-Lay型深水铺管船作业数值分析

以3 000 m J-Lay型深水铺管船作业为研究对象，建立全耦合数值分析模型。通过准静态分析研究立管敏感性参数变化规律，确定铺管作业时最优立管顶端倾角。考虑剖面流、风和波浪综合作用，对不同工况下铺管作业过程进行数值模拟，对铺管作业过程中立管受力特征、顶端固定点运动状态进行预报和研究。研究表明，立管顶端倾斜角度改变对立管最大弯矩有显著影响，顶端倾角范围宜在80°~85°。在风浪流综合作用下，由于横摇与纵摇运动的耦合作用，横浪和尾斜浪向立管顶端最大弯矩显著增大，在作业过程中应引起关注。

Numerical Analysis of J-Lay Type Deepwater Pipe-Laying Vessel Operation

Taken J-Lay type pipe-laying vessel operation in 3 000 m deepwater as research object, the full coupled numerical analysis model is established. Through quasi-static analysis, the variation of riser sensitivity parameters is studied, and the optimal top inclination angle of the riser in pipe-laying operation is determined. Considering the combined action of current, wind and wave, the operation process in different conditions are simulated. The mechanical character and motion state of the top fixed point of the riser are predicted and studied. The results indicate that the variation of the riser top inclination angle is of obvious influence on the maximal bending moment of the riser, and the top inclination range is suitable in the range from 80° to 85°. In the combined action of wind, wave and current, as the coupling action of rolling and pitching motion, the maximal bending moment of the top of the riser sharply increases in beam wave and stern wave, which should be paid more attention to.