基于上浪分析的深海钻井平台上层建筑结构优化研究(英文)

Deck Structure Optimization of Offshore Drilling Platform based on Green Water Analysis

深海钻井平台甲板上浪时水流变化及其载荷对甲板和上层建筑,乃至钻井平台的服役寿命影响很大。文章采用VOF方法及消波理论进行了圆筒型深海钻井平台SEVAN650的上浪分析,获得了平台上浪时主要监测点的时间-压力曲线。根据时间—压力曲线的变化优选特征点,并将各特征点数据导入数值模拟前处理器,完成了上浪分析和结构优化之间的无缝对接,实现了对深海钻井平台上层建筑的加载。强度分析结果表明可以对上层建筑内部采用丰字型焊板进行结构优化,数值分析结果表明平台优化后的最大应力减小了17.3%,应力集中部位的平均应力减少了26.7%,应力分布更加均匀。结合上浪分析和结构优化的分析方法为海工平台结构分析提供了一种新方法。

Green water with changing water and load makes a very big impact on deck structure of offshore drilling platform and its service life. Using VOF and wave absorption theory, the green wa- ter of SEVEN650 was simulated to obtain the time-press curve for major monitoring points. The fea- ture points of time-pressure curve were selected and input the simulation preprocessor to finish the green water analysis, structure optimization and the loading for the deck structure of offshore drilling platform. The results of strength analysis show that special welding plate can be used in deck struc- ture. From the analysis results, the optimized maximum stress reduced 17.3%, and the average stress in the concentrated zone reduced 26.7%. The stress distribution became more even. This method combined green water analysis with structure optimization provides a new method for offshore platform design.