Abstract: Sensitivity analysis and optimization of design parameters were carried out for the key region of hopper knuckle connections in a very large crude carrier (VLCC), aiming to seek the optimal layout of hopper knuckle structures that meets the requirements of the common structural rules. A workflow for yield and fatigue assessment at hopper knuckle connections was first established. The effects of hopper knuckle plate angle, arc radius at the knuckle, and plate thickness on the stress level and fatigue life at the knuckle were studied using Latin hypercube design and orthogonal arrays. On this basis, an intelligent optimization algorithm was adopted to optimize the rounded lower knuckle connection, and the optimal design scheme was obtained. The sensitivity analysis results show that for the rounded lower knuckle connection, the thickness of the inner bottom plate is the most critical factor affecting the stress level, and the arc radius is the most critical factor affecting the fatigue life. The above analysis approach and optimization strategy can provide an empirical reference for the structural optimization design of hopper knuckle connections in similar vessels.

Key words: very large crude carrier(VLCC), hopper knuckle connection, sensitivity analysis, intelligent optimization algorithm

摘要： 该文针对某超大型油船的底边舱折角点关键区域,开展设计参数灵敏度分析及优化,寻求满足共同结构规范要求的底边舱折角结构最优布置方案。首先建立了底边舱折角点屈服和疲劳评估的分析流程,采用拉丁超立方设计、正交数组等方法,研究了底边舱斜板角度、折角处圆弧半径、板厚等因素对折角点处应力水平和疲劳寿命的影响。在此基础上,采用智能优化算法对压弯型下折角开展了优化,得到了最优设计方案。灵敏度分析结果显示：对于压弯型下折角,内底板板厚是影响应力水平的最关键因素,圆弧半径则是影响疲劳寿命的最关键因素。上述分析思路及优化策略可为同类型船的底边舱折角点结构优化设计提供经验参考。

关键词: 超大型油船, 底边舱折角点, 灵敏度分析, 智能优化算法