Abstract: Environmental friendly dual-fuel propelled ships are becoming popular for new shipbuilding. In order to maximize the capacity utilization and take into account the scantlings of the container hold, the type C LNG fuel tanks are transversely arranged below the superstructure in the large dual-fuel container ships. Compared with the LNG carrier, the safety of the traditional saddle structure becomes insufficient due to the significant changes of the load acted on the hull. The optimized arrangement plan and structure design of the saddle are proposed in the current study. The strength and fatigue of the saddle and its supporting structure are analyzed by using the finite element method, and compared with those of traditional saddle design. The results show that the optimized saddle structure can significantly improve the stress distribution and increase the fatigue life. It can provide references for the structure design of the saddle for large container ships with type C LNG fuel tanks.

Key words: large container ship, type C liquefied natural gas（LNG）fuel tank, saddle structure, finite element method（FEM）

摘要： 双燃料推进环保船舶正成为新造船的主流选择,为最大化舱容利用率,兼顾集装箱船舱内的结构尺寸特点,大型双燃料集装箱船将C型LNG燃料罐横置在上层建筑下方的船体内。相较于LNG运输船,船体承受的载荷发生较大变化,传统鞍座结构不具备足够的安全性。该文提出一种优化鞍座布置方案以及鞍座结构设计,利用有限元方法对鞍座结构及其支撑加强结构进行强度及疲劳分析,并与传统鞍座设计的结果进行对比,结果表明优化的鞍座结构可以明显改善应力分布,提高疲劳寿命。可为采用C型LNG燃料罐的大型集装箱船的鞍座结构设计提供合理建议。

关键词: 大型集装箱船, C型LNG燃料罐, 鞍座结构, 有限元法