甲板上浪对张紧式方形FPSO运动响应的影响  

Effect of Green Water on Motion Response of Square FPSO with Taut Mooring System

作　　者：宋嘉彧 范菊[1] Song Jiayu;Fan Ju(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院、海洋工程国家重点实验室,上海200240

出　　处：《水动力学研究与进展（A辑）》2023年第3期463-471,共9页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(51479117)。

摘　　要：在恶劣海况下,甲板上浪会对船舶与海洋工程结构的安全产生很大威胁。该文采用随机选取法求解浅水波方程,建立甲板上水体的运动模型,用于考虑FPSO的甲板上浪情况。运用上浪水体运动模型计算典型的液舱晃荡问题,并将计算结果与浅水求解器得到的结果相比较,验证了上浪水体运动模型的可行性。基于三维势流理论及间接时域法建立FPSO的时域运动方程,将其与上浪水体的运动方程耦合,采用线性弹簧模拟张紧式系泊系统,对比分析两种海况下上浪影响计入与否的FPSO运动时历、统计值和频谱。结果表明,迎浪海况下,上浪主要影响的是纵摇运动且起到抑制作用,同时计算上浪概率和上浪产生的冲击力以量化考虑上浪严重程度。该方法对FPSO在浅水极端海况下的安全作业有重要指导作用。In harsh marine condition,green water threatens ships and marine structures.The shallow water equation based on the random choice method is used to establish the green water motion model,which can be used to consider the green water conditions of FPSO.The model is used to calculate typical tank sloshing problems and the results are compared to analytical solutions to verify the feasibility of the model.Based on the three-dimensional potential flow theory and indirect time-domain transformation method,the time-domain motion equation of FPSO with linear mooring system is coupled with the motion equation of green water.And the time history,the statistics and spectrum analysis of motions are compared with or without considering the influence of green water under two sea conditions.It has found that green water mainly affects the pitching motion of FPSO in head sea,and acts as a inhibited effective pitch damper.In addition to that,the probability and impact force caused by green water are calculated to quantify the severity.The results of this paper can provide important guidance for the safe operation of FPSO in shallow water under extreme sea conditions.

关 键 词：甲板上浪 FPSO 浅水波方程 随机选取法 

分 类 号：U661.2[交通运输工程—船舶及航道工程]