面向缺陷容忍的加筋筒壳快速优化设计  

Accelerated optimization design of stiffened cylindrical shell for imperfection tolerance

作　　者：马祥涛 王法垚 朱英杰 郝鹏[1] 王博[1] 刘观日 MA Xiangtao;WANG Fayao;ZHU Yingjie;HAO Peng;WANG Bo;LIU Guanri(State Key Laboratory of Structural Analysis For Industrial Equipment,Department of Engineering Mechanics,Dalian University of Technology,Dalian 116024,China;Beijing Aerospace Systems Engineering Institute,Beijing 100076,China)

机构地区：[1]大连理工大学工程力学系工业装备结构分析国家重点实验室,大连116024 [2]北京宇航系统工程研究所,北京100076

出　　处：《航空学报》2023年第1期177-186,共10页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(11825202,11772078);国防基础科研计划(JCKY2020110);辽宁省自然科学基金(2019-YQ-01);中央高校基本科研业务费(DUT2019TD37,DUT21GF201);辽宁省创新人才计划(XLYC1907142,XLYC1802020)。

摘　　要：为了提高运载火箭等航天装备结构的承载效率,实现航天薄壁筒壳结构的轻量化和精细化设计,以具有强缺陷敏感性的航天薄壁筒壳结构为研究对象,开展了面向缺陷容忍的加筋筒壳结构优化设计。通过在设计过程中考虑结构设计与临界失稳载荷和结构缺陷敏感性的耦合关系,同步提升结构的屈曲载荷和抗缺陷能力,实现筒壳结构的精细化和轻量化设计。并针对计及缺陷敏感性加筋筒壳单次分析耗时和优化效率低的问题,使用不完全折减刚度法(iRSM),替代非线性显式后屈曲算法进行非完善筒壳结构的承载能力分析,提出了一种面向缺陷容忍的加筋筒壳快速优化设计框架。以一个直径1.6 m的正置正交网格加筋筒壳结构作为算例进行说明,结果显示,相比初始设计,优化结果可在质量不变的前提下,实现设计载荷提升10%以上,有效提高航天加筋筒壳结构的承载效率;并且所提出的优化设计框架能在保证稳定找到优化结果的同时,降低计算成本80%以上,实现面向缺陷容忍加筋筒壳结构的高效优化设计。To improve the load-bearing efficiency of aerospace equipment structures such as the launch vehicle and realize the lightweight and detailed design of aerospace thin-walled cylindrical shell structures,this study investigates the aerospace thin-walled cylindrical shell structure sensitive to imperfections,designing the stiffened cylindrical shell oriented to imperfection tolerance.By considering the coupling relationship between structural design and critical buckling load and structural imperfection sensitivity in the design process,we simultaneously improve the buckling load and anti-defect ability of the cylindrical shell to realize the detailed design and lightweight design of the shell structure.In addition,in view of the time-consuming single analysis and low optimization efficiency of the imperfection-sensitive stiffened shell,we adopt the incomplete Reduced Stiffness Method(iRSM)instead of the nonlinear explicit post-buckling algorithm to perform the load-bearing analysis of the imperfect stiffened cylindrical shells.An accelerated optimization design framework oriented to imperfection tolerance for the stiffened shell is established based on the iRSM.An orthogonal grid stiffened cylindrical shell structure with a diameter of 1.6 m is taken as an example for illustration.The results show that the design load of optimized results can be improved by more than 10%with the same mass compared with the initial design,thereby effectively improving the bearing efficiency of aerospace stiffened cylindrical shells.Furthermore,the proposed method can reduce the calculation cost by more than 80%while ensuring stable optimization results to realize the efficient optimization design of the imperfection-tolerant stiffened cylindrical shell structure.

关 键 词：加筋筒壳 屈曲 缺陷敏感性 轴压 结构设计 

分 类 号：V214[航空宇航科学与技术—航空宇航推进理论与工程] V414