深吃水半潜式平台垂荡响应数值分析

Numerical simulation of the heave motion of a deep draft semi-submersible platform

为优化半潜式平台的垂荡性能,以DPS 2001-4深吃水半潜式平台半潜式平台为例,在频率内采用粘滞阻尼线性化方法,通过数值迭代计算得到了该平台的垂荡响应幅值算子(RAO).根据得到的垂荡RAO,分析了垂荡板对平台垂荡响应的影响,并进一步求得了平台在墨西哥湾、西非和中国南海海域百年一遇海况下的垂荡响应极值.计算结果表明:垂荡板系统对平台的垂荡响应有着很好的抑制作用,但随着垂荡板放置水深的增加,平台在各海况下的垂荡响应极值逐渐变小,当水深超过100 m后,垂荡响应极值将逐渐趋于恒定.

To optimize the heave motion performance of a semi-submersible platform,according to the DPS 2001-4 deep draft semi-submersible platform,the heave response amplitude operators for the platform were obtained through numerical iteration,and the viscous damping was linearized in the numerical simulation.Based on the heave response amplitude operator（RAO）,the influence of the heave plate on the platform heave motion RAO was analyzed,and the platform heave motion extremes under 100-yr return periods for ocean conditions in the Gulf of Mexico,West Africa,and the South China Sea were calculated.The numerical results indicated that the heave plate can restrain the heave motion response of the platform,and the platform heave motion extremes gradually decrease with the increase of the heave plate depth,but would tend to be constant if the depth of heave plate exceeded 100 m.