作业水深对浮式半潜平台波浪砰击的影响

Influence of Operating Water Depth on Wave Slamming of Floating Semi-submersible Platforms

结合模型试验,基于数值重构和外推的计算模型,采用时域全耦合分析方法,对浮式半潜平台全水深锚泊系统以及风、浪、流载荷的联合作用进行模拟,针对动力辅助锚泊定位平台与锚泊定位平台在不同作业水深下的波浪砰击进行对比研究。研究结果表明:浮式半潜平台关注点处波浪砰击次数受作业水深的影响敏感。平台在同等环境工况下,关注点处负气隙以及波浪砰击次数随着作业水深的增加而加剧。动力辅助锚泊定位平台较之于锚泊定位平台的随动性更好,可有效减小平台与水质点的相对运动,作业水深变化引起的动力辅助锚泊定位平台同一关注点的砰击次数、气隙变化以及改善幅值明显优于锚泊定位平台。在平台设计过程中,作业水深对平台气隙和波浪砰击的影响应引起重视。

Combined with model test, based on numerical reconstruction and extrapolation calculation model, the full-scale mooring system of floating semi-submersible platforms and the combined action of wind load, wave load and current load are simulated by using time-domain fully coupled analysis method. A comparative study of wave slamming between dynamic auxiliary anchor positioning platform and anchor positioning platform under different operating water depth was carried out. The results show that the number of wave slamming at the focus of floating semi-submersible platform is sensitive to the operating water depth. In the same environment, the negative air gap and the number of wave slamming increase with the increase of water depth. Compared with the mooring platform, the dynamic movability of the dynamic auxiliary mooring platform is better than that of the mooring platform, which can effectively reduce the relative motion between the platform and the water quality point, and the slamming times of the same concern point caused by the change of water depth. The change of air gap and the improvement of amplitude are obviously superior to those of anchoring platform. In the course of platform design, the influence of water depth on air gap and wave slamming should be paid more attention.