极限波浪下半潜平台气隙和波浪爬升的统计分析  

Statistical analysis of airgap and wave run-up for a semi-submersible platform under extreme waves

作　　者：闫发锁[1] 杨慧[1] 沈鹏飞[1] 赵九龙[1] 

机构地区：[1]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2015年第2期143-146,共4页Journal of Harbin Engineering University

基　　金：深海工程科学与技术创新引智基金资助项目(B07019);中央高效基本科研业务费资助项目(HEUCFZ1002)

摘　　要：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。The airgap is one of the key parameters in the design of semi-submersible platforms. A series of model tests were performed to investigate the airgap responses of a deepwater semisubmersible platform under extreme sea conditions, deriving the severity of airgaps and the probability distribution of the airgap values at 11 locations on the deck. It is proven in the experiment that the severest region of airgap lies in the vicinity of post in the back of the platform under the oblique wave circumstances. The experimental results were compared with the numerical prediction by the three-dimensional potential flow method, showing that the minimal values of airgaps at the measure points are generally lower than the numerical calculation results, namely the linear potential flow method underestimates the severity of airgaps. The analyses of signalsr energy spectrum density proved the low frequency elements account for a considerable proportion in the airgap responses. The cross-zero statistics and probability distribution fitting on the time history of airgap measure points indicate that the Gaussian model can reflect general distribution of airgap values, but the distribution of extremal points needs to be fitted for correction.

关 键 词：半潜式平台 气隙 模型试验 概率分布 波浪爬升 极限波浪 

分 类 号：U674.38[交通运输工程—船舶及航道工程] TV131.2[交通运输工程—船舶与海洋工程]