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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。
In this paper, a simplified method for calculating the wave force of a mobile offshore base (MOB) in a semi-submersible ultra-large floating structure under high sea conditions is studied. Based on the modified Morison equation of floating body, the formula of wave force in MOB structure is deduced theoretically. Taking the MOB structure “three-module model ” as an example, the wave-force-displacement of each module in a random irregular wave based on Bretschneider spectrum simulated under 6-level sea- With the lapse of time rule, the statistical results of the simplified algorithm are compared with the results of the potential flow theory, and the error analysis of the two is made. The results show that the MOB wave force statistic obtained by the simplified algorithm is in good agreement with the potential flow theory and the relative error between the two is within the allowable range of the project, which can fully verify the correctness and rationality of the simplified algorithm With feasibility. The proposed algorithm is simpler than the potential flow theory. It is suggested that this method can be used to evaluate the wave loading of MOB structures under different working conditions efficiently. The research results can be used as the power of semi-submersible ultra-large floating structure Responding to research and laying the foundation.