VLCC船首外飘结构冲击及砰击强度

Impact and slamming strength of VLCC bow flare structure

现有CSR规范仅考虑了冲击压力对VLCC船首外飘结构的影响而忽略了砰击压力的影响,使得具有较大船首外飘结构的VLCC常由于遭遇较大波浪载荷而受损.本文借鉴CSR规范载荷体系提出两种冲击压力的假设,并结合实船案例数据,采用有限元法对受损结构进行逆向工程计算,采用最小二乘法分析实验数据以寻求最优解.最后,根据最佳方案对损坏结构提出修改方案并验证.本文的研究结果可为超大型油船的结构设计提供思路.

Current CSR codes only consider the influence of impact pressure on the bow flare structure of VLCC bow, but neglect the impact of slamming pressure. As a result, VLCC with large bow flare structure was often damaged by large wave loads. In this paper, two kinds of impact pressures were proposed based on the CSR code load system, the reverse engineering calculation was carried out by using the finite element method for damaged structures by combining with real ship case data, and the least square method was used to analyze the experimental data to search for the optimal solution. Finally, according to the best scheme, the modification scheme of damaged structure was proposed and verified. The results can provide help for the structural design of VLCC.