【摘要】 为优化飞翼式飞行器的结构,提出同时考虑结构布局优化和构件尺寸优化的两级优化方法.第1级优化将翼梁数量范围和位置范围作为约束,以重量最轻为优化目标,采用iSIGHT的多岛遗传算法优化结构布局;第2级优化给予第1级给定的结构布局方案,在满足应力约束和位移约束的前提下,确定各构件最佳尺寸,使该结构布局方案的结构重量最轻.在第2级优化中,根据CAD外形模型和固定的结构布局参数,采用MSC Patran的PCL语言自动生成飞机的结构有限元模型,采用MSC Nastran优化全机结构,并将优化结果返回给第1级.再通过两级之间的迭代获得结构布局和构件尺寸的最优设计方案.整个两级优化过程用iSIGHT集成.实例表明该方法为飞翼式飞行器结构布局和构件尺寸协同优化问题提供1种有效的解决办法.更多还原

【Abstract】 To optimize the structure of flying wing aircraft,a tow-level optimization method is proposed considering the optimization of structural layout and component size at the same time.In the first level,the number and position of wing beam are taken as the constraint,the lightest weight is taken as the optimization object,and the structural layout is optimized by multi-island genetic algorithm of iSIGHT.The second level is based on the structural layout obtained by the first level,the best size of every component is confirmed while the constraint of stress and displacement is satisfied,and so the lightest structure is obtained.In second level,according to the profile model of CAD and the fixed parameters of the structural layout,the finite element mode of an aircraft model is automatically generated using PCL of MSC Patran,the structural size of the whole aircraft is optimized using MSC Nastran,and the optimization results are returned to the first level.The optimal optimization deign solution of the structural layout and component size is achieved by the iteration between the first level and the second level.The optimization of the two levels are integrated by iSIGHT.The examples indicate that the method provides an effective solution for the collaborative optimization of structural layout and component size for flying wing aircraft.更多还原