基于纵弯曲强度可靠性分析的船舶中剖面优化

研究基于船舶纵弯曲强度可靠性分析的全概率方法,以通过波浪载荷直接计算软件和船舶剖面强度信息计算得到的纵弯曲强度失效概率为目标函数,以相关规范对剖面构件的尺寸要求和剖面面积上限作为约束条件,通过MATLAB建立优化模型。并结合MATLAB集成的遗传算法工具箱对船舶中剖面进行优化设计。算例结果表明在剖面面积减小了0.38%的情况下,纵弯曲强度失效概率由原来的7.22×10-5降低为1.32×10-5,表明此方法用于船舶中剖面结构优化是行之有效的。

Optimization of Mid-ship Section Based on Reliability Analysis of Longitudinal Bending Strength

The optimization model was built in view of a fully probabilistic method of ship longitudinal bending strength reliability analysis by MATLAB. The objective function was obtained by wave loads direct calculation software and ship section strength information. The requirements for section component recorded by related rules and the upper limit of section area were used as constraints. Combined with the optimization model, genetic algorithm toolbox integrated in MATLAB was used to study on optimization design. Results of the examples show that the failure probability of ship longitudinal bending strength was reduced from 7.22×10-5 to 1.32×10-5, with reduction of section area of 0.38%. This suggests that this method is effective for mid-ship section optimization.