考虑加工误差的大型运载火箭框桁加强薄壁圆柱壳优化设计

doi:10.3901/JME.2021.18.190

机械工程学报 ›› 2021, Vol. 57 ›› Issue (18): 190-203.doi: 10.3901/JME.2021.18.190

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考虑加工误差的大型运载火箭框桁加强薄壁圆柱壳优化设计

王志祥^1,2, 雷勇军^1,2, 张大鹏^1,2, 欧阳兴³, 王婕³

1. 国防科技大学空天科学学院长沙 410073;
2. 空天任务智能规划与仿真湖南重点实验室长沙 410073;
3. 北京宇航系统工程研究所北京 100076

收稿日期:2020-12-03 修回日期:2021-05-06 出版日期:2021-09-20 发布日期:2021-11-30
通讯作者: 雷勇军(通信作者),男,1968年出生,博士,教授,博士研究生导师。主要研究方向为计算固体力学、结构分析与优化设计。E-mail:leiyj108@nudt.edu.cn
作者简介:王志祥,男,1992年出生,博士研究生。主要研究方向为结构分析与优化设计、近似建模方法和近似优化方法。E-mail:wangzhixiangaadt@163.com
基金资助:
国家重点研发计划课题（2017YFB0306200）、国家自然科学基金（11902348）、湖南省自然科学基金（2020JJ5650）和国防科技大学科研计划（ZK20-27）资助项目。

Optimization of Cylindrical Stiffened Shells in Large Launch Vehicles Considering Manufacturing Tolerance

WANG Zhixiang^1,2, LEI Yongjun^1,2, ZHANG Dapeng^1,2, OUYANG Xing³, WANG Jie³

1. College of Aerospace Science and Engineering, National University of Defense and Technology, Changsha 410073;
2. Hunnan Key Laboratory of Intelligent Planning and Simulation for Aerospace Missions, Changsha 410073;
3. Beijing Institute of Aerospace Systems Engineering, Beijing 100076

Received:2020-12-03 Revised:2021-05-06 Online:2021-09-20 Published:2021-11-30

摘要/Abstract

摘要： 为提高加工误差影响下大型运载火箭框桁加强薄壁圆柱壳的可靠性和安全性，开展考虑加工误差的框桁加强圆柱壳优化设计。探究框桁加强柱壳整体压溃破坏的主要机理，分析总结典型截面加强桁失稳模式及关键参数对结构承载性能的影响规律，颠覆传统以提高桁条横向弯曲刚度为主的设计理念。提出基于探索策略和开发策略的并行序列近似优化方法，提高框桁加强薄壁圆柱壳后屈曲优化效率，并获得相对初始设计减重482 kg的优化结构。提出基于序列近似优化方法和最大加工误差分析法的结构优化方法，显著降低加工误差影响下该优化结构提前失效的发生几率，提高该优化结构的可靠性和安全性。结果表明，桁条弯扭耦合翘曲失稳是导致框桁加强薄壁圆柱壳发生整体压溃破坏的主要因素；降低桁条翼缘板宽厚比以及在腹板不提前发生局部失稳下增加腹板高厚比，可提高结构承载效率；考虑加工误差下获得的优化结构具有更高的桁条翼缘板厚度t_yy，加工误差影响下其承载性能可靠性更高，表明所提优化方法的有效性。

关键词: 大型运载火箭, 框桁加强薄壁圆柱壳, 并行序列近似优化方法, 加工误差, 最大加工误差分析法

Abstract: To improve the reliability and safety of cylindrical stiffened shells in large launch vehicles under the influence of manufacturing tolerance, the optimization of cylindrical stiffened shells is carried out considering manufacturing tolerance. The collapse mechanism of the cylindrical stiffened shells is investigated. The influences of the buckling modes and key parameters of stringers on the load-carrying capacity of cylindrical stiffened shells are also analyzed and summarized, which overturns the traditional design concept of enhancing the bending stiffness of the stringers. A parallel sequential approximate optimization incorporating an exploration strategy and an exploitation strategy is proposed, which improves the computational efficiency of the post-buckling optimization of cylindrical stiffened shells and obtains an optimum structural with a reduction of 482 kg compared with the initial design. Furthermore, a novel optimization method considering manufacturing tolerance for cylindrical stiffened shells is proposed based on the sequential approximate optimization method and the maximum manufacturing error analysis, which significantly reduces the probability of the premature failure of the optimized structure under the influence of manufacturing tolerance and enhances the reliability and safety of the cylindrical stiffened shells. Some conclusions can be drawn from the results. The flexural-torsional coupling buckling of stringers becomes the main factor of the collapse of the cylindrical stiffened shells. What's more, the load-carrying efficiency of the cylindrical stiffened shells can be elevated by reducing the width-thickness of the flange plate and increasing the height-thickness of the web without local instability. Finally, the optimized structure obtained under the consideration of manufacturing tolerance has a thicker flange plate and its load-carrying performance is more reliable under the influence of the manufacturing tolerance, indicating the effectiveness of the proposed optimization method.

Key words: large launch vehicles, cylindrical stiffened shells, parallel sequential approximate optimization method, manufacturing tolerance, the maximum manufacturing error analysis

中图分类号:

V214
O344

王志祥, 雷勇军, 张大鹏, 欧阳兴, 王婕. 考虑加工误差的大型运载火箭框桁加强薄壁圆柱壳优化设计[J]. 机械工程学报, 2021, 57(18): 190-203.

WANG Zhixiang, LEI Yongjun, ZHANG Dapeng, OUYANG Xing, WANG Jie. Optimization of Cylindrical Stiffened Shells in Large Launch Vehicles Considering Manufacturing Tolerance[J]. Journal of Mechanical Engineering, 2021, 57(18): 190-203.

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考虑加工误差的大型运载火箭框桁加强薄壁圆柱壳优化设计

Optimization of Cylindrical Stiffened Shells in Large Launch Vehicles Considering Manufacturing Tolerance

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