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基于浮体Morison方程的半潜式超大型浮式结构波浪力简化计算方法

ISSN号：1000-6982
期刊名称：《船舶工程》
时间：0
分类：P751[交通运输工程—港口、海岸及近海工程;天文地球—海洋科学]
作者机构：[1]天津大学水利工程仿真与安全国家重点实验室高新船舶与深海开发装备协同创新中心,天津300072, [2]重庆交通大学河海学院,重庆400074
相关基金：国家自然科学基金（51679166）;国家自然科学基金创新研究群体科学基金（51321065）; 交通运输部交通建设科技项目（2014328224040）

关键词：浮体Morison方程, 半潜式超大型浮式结构, 移动式海上基地, 波浪力, 简化算法, floating body Morison equation, semi-submersible type very large floating structure, mobile offshore base, wave force, simplified computational method

中文摘要：

文章研究了半潜式超大型浮式结构中移动式海上基地（MOB）在高海况随机波作用下波浪力的简化计算方法。基于修正后的浮体Morison方程,理论推导得出了MOB结构波浪力的计算公式。以MOB结构＂三模块模型＂为例,研究其在6级海况条件下基于Bretschneider谱模拟的随机不规则波中浪向角变化在0°~90°范围内,各模块的波浪力—历时规律,将简化算法的计算结果统计值与势流理论的结果进行对比,并对二者进行误差分析。结果表明,运用简化算法得到的MOB波浪力统计结果与势流理论的结果吻合程度高,且二者之间的相对误差在工程允许的范围之内,可充分验证简化算法的正确性、合理性与可行性。文中提出的算法相比于势流理论更加简单,建议在结构初步设计阶段运用该方法,可高效评估大量不同工况下MOB结构的波浪荷载,研究成果可为半潜式超大型浮式结构动力响应研究奠定基础。

英文摘要：

This paper investigates the simplified computational method for evaluating the wave force on mobile offshore base（MOB） which is one of the typical semi-submersible type of very large floating structures, under random wave stimulating at high sea state. Formulas for estimating the wave force on modular semi-submersible structure are derived based on revised floating body Morison equation. A 3-modules MOB numerical model at sea state 6 is performed as a case study. The relationship between wave force on each module and time are evaluated based on the Bretschneider spectrum, and different wave angles are considered. The statistical results of the paper＇s method are compared to the potential flow theory results, and the relative errors among the two results are simultaneously analyzed. The conclusions indicate that the statistical values of wave forces on MOB correspond well with the results of the potential flow theory, and the relative errors among the two method fall within the permitted range for practical engineering, validating the correctness, feasibility and reasonability of calculation methodologies developed in the paper. Meanwhile, the simplified method for the paper is easier than the potential flow theory, it is suggested that the simplified method by the paper could be used in high-efficiently evaluating the wave loads on MOB structures under a large number of different load cases in the preliminary design stages. The findings in the paper may establish significant foundations for researching the hydrodynamic response of semi-submersible type very large floating structures.

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