超深水钻井船波浪载荷计算分析

Wave Loads Analysis of an Ultra-deepwater Drillship

为了准确评估钻井船的波浪载荷,应用三维线性势流理论,结合北大西洋波浪散布图,对某钻井船进行波浪载荷长短期预报,对比分析同概率水平下波浪载荷的长短期预报极值,波浪弯矩直接计算值与挪威船级社规范值比较表明,同概率水平下,波浪载荷的短期预报极值稍大于长期统计极值。对于该型工程船舶,应采用直接计算法来评估波浪载荷。

In order to evaluate the wave load of an ultra-deepwater drillship accurately,the three-dimensional linear potential flow theory was applied to carry out the long-term and short-term prediction of wave loads according to the North Atlantic wave scatter diagram.The extreme value of long-term and short-term prediction at the same probability level was compared.The wave bending moment of direct calculation was compared with the values of rules from DNV GL.The results showed that at the same probability level,the short-term prediction values of wave loads are slightly larger than the long-term statistical values,but the direct calculated values are far larger than the values of DNV GL rules.The simplified formula of Rules cannot obtain the reasonable wave loads of this type of engineering vessel,and the direct calculation method should be used to evaluate the wave loads.