基于序列径向基函数的运载火箭蒙皮桁条结构轻质优化

Lightweight optimization of skinned purlin structure in launch vehicle based on sequential radial basis function

以我国大型运载火箭薄壁加筋结构轻量化设计为研究背景,针对轴压下大直径大载荷蒙皮桁条结构开展后屈曲轻质优化研究。基于Python语言建立蒙皮桁条结构参数化模型,为确定结构的极限承载能力,开展蒙皮桁条结构后屈曲分析。针对蒙皮桁条结构轻质优化涉及离散的拓扑和连续的尺寸优化问题,提出基于近似模型和组合优化算法的序列近似优化方法,并利用近似最优解加速算法收敛,确定蒙皮桁条结构最优设计方案。工程算例结果表明,所提序列近似优化方法使大直径大载荷运载火箭蒙皮桁条结构减重效果明显,验证了方法的有效性。

Taking the lightweight optimization of skinned purlin structure in large-scale launch vehicle as the research background,the post-buckling lightweight optimization of large-diameter and large-loaded skinned purlin structure was carried out.In order to achieve ultimate bearing capacity of the structure,the post-buckling behavior of skinned purlin structure was analyzed based on the parametric model established by Python code.Considering that discrete topology and continuous size variables were involved in the lightweight optimization of skinned purlin structure,sequence approximate optimization method based on the surrogate model and combinatorial optimization algorithm was proposed.What′s more,approximate optimal solution was used to accelerate algorithm convergence,which can obtain the final design scheme of skinned purlin structure.The results of engineering examples show that the sequence approximate optimization method propose in this paper make the weight loss effect of skinned purlin structure obvious,and verifies the effectiveness of the method.