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极限波浪下半潜平台气隙和波浪爬升的统计分析

DOI: 10.3969/j.issn.1006-7043.201307017

Keywords: 半潜式平台, 气隙, 模型试验, 概率分布, 波浪爬升, 极限波浪

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Abstract:

气隙是半潜式平台设计的关键参数之一。对一座深水半潜式平台在极限海况下的气隙响应进行了模型试验, 研究了测点气隙的严重程度和量值的概率分布。通过试验证实, 斜浪情况下平台后立柱附近为气隙最严重区域。试验结果与三维势流方法的数值预报的比较表明, 测点的气隙极小值总体上低于数值计算值, 亦即线性势流方法低估了气隙的严重程度。通过信号的能量谱密度分析, 低频成分在气隙响应中占有较大的比例。对气隙测点的时历进行跨零统计和概率分布拟合, 结果表明高斯模型能在总体上反映极限海况下气隙量值的分布规律, 但在极值点的分布上需要拟合修正。

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