新型FPSO IQFP的水动力性能研究

为了进一步论证新型FPSO IQFP的水动力性能,根据一个优化的IQFP工程设计实例,应用三维势流理论的源汇分布法,建立水动力计算模型,进行IQFP浮体的频域波浪力和运动响应的数值计算分析,并与相近吨位的船型FPSO进行比较。研究结果表明,IQFP的横荡、横摇和垂荡固有周期与百年一遇谱峰周期相差3 s以上,有效地避开了波浪能量集中的频域范围,避免了结构与海浪集中的频率发生共振,因此IQFP可以与作业海域极端环境条件相适应;由于长宽尺寸相同且平面轴对称,所以IQFP不仅能有效降低建造难度和成本,而且只需用横摇/纵摇、垂荡和横荡/纵荡3个自由度来描述其运动响应,大大降低了计算分析的难度。

Research on the Hydrodynamic Performance of the Neotype FPSO IQFP

To conduct a further verification of the hydrodynamic property of the neotype FPSO IQFP,the hydrodynamic calculation model was established.The study was based on an optimized IQFP engineering design example adopting the source distribution method of the three-dimensional potential flow theory.The numerical calculation and analysis of the frequency domain wave force and motion response of the IQFP floating body were carried out.The result was compared with that of the ship type FPSO with a similar tonnage.The research findings show that the inherent period of the IQFP surging,rolling and heaving is equivalent to the once-in-a-century spectrum peak period by 3 s.It effectively avoids the frequency domain scope of wave energy concentration as well as the resonance of structure and wave concentration frequency.Therefore,it can adapt itself to the extreme conditions of the operating sea,avoiding the shutdown caused by the severe environment.Due to the similar size of length and width and the symmetry of surface axes,the IQFP cannot only effectively decrease building difficulty and cost but also use nothing more than the three degrees of freedom such as rolling/pitching,heaving and swaying/surging to depict its motion response.As a result the difficulty of calculation and analysis has been reduced remarkably.