摘要
基于三维势流理论和Morison方程对一半潜平台生存工况下4种特征波浪载荷进行了预报,研究了平台湿表面网格尺寸与计算时间的关系,并考查了平台杆件对波浪载荷的影响。研究了不同海况资料对长期预报结果的影响,以及浪向和海况对波浪载荷长期极值分布的影响。通过短期结果、长期结果以及简化公式计算结果的对比,发现南海特征严重海况的短期最可能极值与长期预报中10-8超越概率下的结果相当,而简化公式结果在量级上与前两者保持一致。研究结果对平台结构在恶劣海况中的极值设计载荷的确定具有指导意义。
Four kinds of wave loads on a semi-submersible in survival condition were predicted with three dimensional potential flow theory and Morison equation.The relationships between wet surface mesh sizes and computational time were studied,and the effects of bracing members on wave loads were considered.The effects of different scatter diagrams on long-term prediction values and wave heading and sea states on the extreme value distributions were also investigated.By comparing the results of short-term prediction,long-term prediction and simplified formula,it were found that short-term most possible extreme values were correspond with the probability of exceeding 10-8 results of long-term prediction for South China Sea,and simplified formula results were consistent with them only in the order of magnitude.Some suggestions for the determination of extreme wave loads were made for semi-submersible platforms in severe sea states.
出处
《舰船科学技术》
2011年第4期39-47,共9页
Ship Science and Technology
关键词
波浪载荷
短期预报
长期预报
极值分析
半潜平台
wave loads
short-term prediction
long-term prediction
extreme value analysis
semi-submersible
