缆绳直径对多浮体系统动力性能的影响

Influence of mooring line diameter on dynamic performances of flexible multi-body system

为了解多浮体系统动力性能与系泊缆直径的关系,利用频域势流理论对柔性多浮体系统进行理论分析,计算出浮体运动RAO（响应幅值算子）,讨论了波向角为0°,45°和90°工况下系泊缆直径对浮体运动响应和缆索张力的影响。结果显示,系泊缆直径从56mm渐增至114mm时,穿梭油轮的最大水平位移减小,最大横摇角增大,柔性装置的水平运动响应增强,浮体间最大系泊缆力的最大张力增大2~5倍;受柔性装置扭转效应的影响,最大系泊链力随直径渐增而迅速增大。分析表明,系泊缆直径是调节多浮体系统性能的一个重要参数,对整个系统的动力性能有显著影响,设计时应予以充分考虑。

For an in-depth knowledge of the relationship between the mooring line diameter and the dynamic performances of mutli-body system,a flexible multi-body system was analyzed by utilizing frequency domain potential theory.By calculating the motion response amplitude operator（RAO）of the floating bodies,the effect of the mooring line diameter on motion response and mooring line tension was discussed at wave directionθ=0°,45°and 90°respectively.The results show that as the mooring line diameter raises from 56 mm to 114 mm,the maximum horizontal displacement of the shuttle tanker decreases gradually while the roll angle increases conversely.An increase in the line diameter results in an enhancement in the horizontal motion response of the flexible unit and also leads to an increase in the maximum mooring line tension by 2~5times.The maximum mooring chain tension increases rapidly as the mooring line diameter gradually increases.This is due to the fact that the torsion effect of the flexible unit.Further analysis shows that the mooring line diameter is an important parameter in determining the dynamic performance of mooring system,which should be carefully taken into account in the design of the platform.