深水S型铺管作业中托管架多参数优化

Stinger Multi-Parameter Optimization of S-lay Method for Deepwater Pipeline

合理地调整托管架滚轴位置,可以保证深水S型铺管作业安全,提高铺设效率。基于集中质量法理论,考虑海床、海流的影响,建立深水S型铺管的三维管线数值模型,用Newton-Raphson法展开,对离散型托管架模型进行静力迭代求解。在静力求解基础上,以管线最大弯矩最小为目标函数,用进化差分算法对离散型托管架的滚轴高度和每段托管架的角度等众多参数进行优化。通过算例验证了优化方法的有效性。优化后的弯矩可比原设计减小10.9%。

For pipelaying in deepwater with S-lay method, reasonable adjustments of rollers positions can guarantee the safety of pipelines and improve working efficiency. Considering the influence of seabed and current, a three-dimension mechanical model for pipelaying in deepwater with S-lay method is built based on lumped mass simplification. Newton-Raphson method is used to solve the static force on the discrete stinger. Then DE （differential evolution） algorithm is proposed to optimize the geometry of the stinger, including roller height and stinger angle. The effectiveness of the optimization method is demonstrated through numerical examples, in which the optimal bending moment reduces 10.9% compared to the original design.