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将一种新型的仿甲虫鞘翅轻质结构应用于飞机大开口区的筋板结构设计,根据飞机大开口区对结构静/动态性能和散热性能的要求,分别构造目标函数,并采用拉丁超立方试验设计方法确定样本点数,建立有限元参数化模型进行仿真计算,利用响应面法得到各目标函数的响应面拟合函数,之后设定结构的多功能协同优化目标,并通过线性搜索法进行协同优化设计,优化后计算得到仿生轻质结构的散热性能、抗压刚度分别是优化前的14.3倍和2.1倍,动态性能指标得到明显改善,在相同载荷条件下结构减重11%;进一步以飞机大开口区加筋结构的一阶屈曲因子和最大位移作为优化约束条件,并以结构总质量最小为优化目标,构造各自响应面拟合函数,基于遗传算法优化筋板结构整体布局。优化后开口区加筋结构总质量减少15%,屈曲因子为1.02,较优化前提高21%,结构最大位移为12.1 mm,较优化前减少20%,优化效果显著。
A new type of Imitation beetle cobra lightweight structure is applied to the structural design of the ribs in the large open area of the aircraft. According to the requirements of the static / dynamic performance and heat dissipation performance of the aircraft large open area, the objective function is constructed respectively, The experimental design method is used to determine the number of sample points, and the finite element parametric model is established for simulation calculation. The response surface fitting function of each objective function is established by response surface method. After that, the multi-functional collaborative optimization target of the structure is set up and the linear search method is used After optimization, the thermal performance of the bionic lightweight structure was calculated and the compressive stiffness was 14.3 times and 2.1 times before optimization respectively. The dynamic performance index was significantly improved, and the structure weight loss was 11% under the same load. The first order buckling factor and the maximum displacement of the reinforced structure in the large open area are taken as the optimal constraints. The optimization of the minimum total mass of the structure is made. The fitting function of the response surface is constructed and the overall layout of the rib structure is optimized based on the genetic algorithm. After optimization, the total mass of the reinforced structure in the open area is reduced by 15%, the buckling factor is 1.02, 21% higher than that before optimization, and the maximum displacement of structure is 12.1 mm, which is 20% less than that before optimization, and the optimization effect is remarkable.