中文摘要：

浅水油田作业的软刚臂单点系泊FPSO受到浅水效应的影响,其所受二阶波浪力及单点系泊力将剧烈增加,因此需要对其进行深入研究。针对一艘30万吨级软刚臂单点系泊FPSO,基于多体动力学方法,建立FPSO-系泊腿-软刚臂的耦合模型,分别采用Newman近似法和Pinkster近似法,在时域内计算了不同水深吃水比下的单点系泊力。结果表明,水深吃水比超过一定值时,Pinkster近似法计算得到的系泊力将小于Newman近似法的系泊力;以系泊力相等时的水深吃水比作为FPSO需考虑浅水效应的临界比值,随着FPSO吃水的增加,FPSO需考虑浅水效应的临界水深吃水比呈线性减小的规律。

英文摘要：

For some soft yoke mooring FPSOs working in shallow-water oilfields,the shallow water effect will greatly increase second-order wave drift forces and mooring forces. Therefore,further studies are needed.A 30 WDT soft yoke mooring FPSO was utilized to investigate the critical ratio of water depth and draft （ WD/T ）. Dynamic re-sponse capability of the soft yoke mooring FPSO under different WD/Ts was analyzed on the basis of multi-body dy-namics method. A model that includes SYMS and FPSO was established. Newman approximation and Pinkster ap-proximation were applied,and the mooring forces under different WD/Ts were analyzed in the time domain. Results show that,with the increase in WD/T,the mooring forces calculated by Pinkster approximation are smaller than those calculated by Newman approximation. The ratio of water depth and draft at equal mooring force is taken as the critical ratio when FPSO needs to consider the shallow water effect following the increase of FPSO draft,FPSO needs to consider the law of a linear decrease in the ratio of water depth and draft under the shallow water effect.