中文摘要：

以设计水深为1.5km的半潜式平台为研究对象,假设相对波浪升高峰值服从双参数Weibull分布,引入LH矩法,通过模型试验数据对分布中的未知参数进行估计,得到相应的超越概率分布曲线.分析结果表明：随着LH矩阶数的增加,双参数Weibull分布可以很好地拟合非线性较弱的一年一遇海况下相对波浪升高较大部分峰值,对于百年一遇海况下非线性较强的相对波浪升高较大部分峰值,拟合程度也显著改善.

英文摘要：

For a semi-submersible operated in water at a depth of 1.5km,the sample data of the relative wave crests at different locations from an experiment were assumed to follow a two-parameter Weibull distribution and the method of LH-moments was used to estimate the parameters.Then,the exceedance probability distributions for different orders of LH-moments were obtained.The results show that as the order of LH-moments increases,the two-parameter Weibull distribution yields better trend of the large relative wave crests under the 1-year-return sea state,and clearly a better fit of the large relative wave crests under the 100-year-return sea state.