基于RBF模型的蒙皮桁条结构减轻孔优化

Optimum design of lightening holes for skin-stringer structures based on RBF model

面向未来运载器大轴压服役性能和结构轻量化需求,提出一种布置于蒙皮桁条结构中间框上的新型长圆减轻孔,可在小幅提高结构轴压极限承载能力的前提下,实现结构减重。考虑到后屈曲分析的计算效率,基于径向基函数(Radial Basis Function,RBF)代理模型,构造了蒙皮桁条结构减轻孔的后屈曲优化模型。算例结果表明,长圆减轻孔模型较初始设计和圆形减轻孔模型承载效率更高,且可设计性增强。这种新型减轻孔模型有望应用在未来重型运载火箭的蒙皮桁条结构设计中。

With regard to the requirements of performance and lightweight design for future vehicles under huge axial compression,a novel long circle lightening hole model was developed,for middle rings of skin-stringer structures,which can produce a reduction of structural weight accompanied with a slight increase of load-carrying capacity. Since the post-buckling analysis of such a skin-stringer structure is time-consuming,an optimization formulation for lightening holes of skin-stringer structures was established based on RBF model. Results of the illustrative example indicate that,the long circle lightening hole model has higher structural efficiency and designability,compared to the initial design and the traditional circle hole model. It is expected that this novel lightening hole configuration can be utilized in the skin-stringer structure design of future heavy-lift launch vehicles.