Article(id=1241699534804415370, tenantId=1146029695717560320, journalId=1227999626482147330, issueId=1241699531444769296, articleNumber=null, orderNo=null, doi=10.16579/j.issn.1001.9669.2025.04.018, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1691856000000, receivedDateStr=2023-08-13, revisedDate=1693497600000, revisedDateStr=2023-09-01, acceptedDate=null, acceptedDateStr=null, onlineDate=1773973838759, onlineDateStr=2026-03-20, pubDate=1744646400000, pubDateStr=2025-04-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773973838759, onlineIssueDateStr=2026-03-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773973838759, creator=13701087609, updateTime=1773973838759, updator=13701087609, issue=Issue{id=1241699531444769296, tenantId=1146029695717560320, journalId=1227999626482147330, year='2025', volume='47', issue='4', pageStart='1', pageEnd='157', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773973837957, creator=13701087609, updateTime=1773974092709, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241700600002433947, tenantId=1146029695717560320, journalId=1227999626482147330, issueId=1241699531444769296, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241700600006628252, tenantId=1146029695717560320, journalId=1227999626482147330, issueId=1241699531444769296, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=148, endPage=157, ext={EN=ArticleExt(id=1241699535064462227, articleId=1241699534804415370, tenantId=1146029695717560320, journalId=1227999626482147330, language=EN, title=Data driven multi-fidelity approximate modeling optimization of stiffened conical shell for large launch vehicle, columnId=1241699532912784251, journalTitle=Journal of Mechanical Strength, columnName=∙Optimization∙Reliability∙, runingTitle=null, highlight=null, articleAbstract=

In order to improve the load-bearing efficiency of the stiffened conical shell in large launch vehicle, the lightweight design of the stiffened conical shell was carried out via a data-driven multi-fidelity approximate modeling optimization method. Aiming at the problems such as low efficiency and insufficient accuracy of the single fidelity approximate modeling optimization method, a data-driven multi-fidelity approximate modeling optimization framework was built based on variable-fidelity expected improvement (VF-EI) point criterion,and accordingly the optimization design of stiffened conical shell structure was carried out. Based on the finite element models of stiffened conical shells with different mesh sizes, a Co-Kriging multi-fidelity approximate model for the collapse load of stiffened conical shells was established. In the optimization iteration, multi-fidelity sampling points were generated by using VF-EI point criterion, and the global and local approximation accuracy of Co-Kriging multi-fidelity approximation model was improved sequently. Moreover, the optimization efficiency and accuracy of the proposed method were demonstrated by comparing with radial basis function approximation model and Kriging model. Besides, 11. 5% weight reduction of the optimized stiffened conical shell structure is obtained compared with the initial design, which has certain engineering application value.

, correspAuthors=null, authorNote=null, correspAuthorsNote=
WANG Zhixiang, E-mail:
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为提高大型运载火箭加筋圆锥壳舱段结构轴压承载效率,开展了数据驱动的加筋圆锥壳多保真度近似建模轻量化设计。针对单保真度近似建模优化方法效率不高、精度不足等问题,搭建了基于变可信度期望改进(Variable-Fidelity Expected Improvement, VF-EI)加点准则的数据驱动多保真度近似建模优化框架,并据此开展加筋圆锥壳结构轻量化设计。综合利用不同网格规模的加筋圆锥壳有限元模型,建立了加筋圆锥壳极限承载的Co-Kriging多保真度近似模型;优化迭代中,利用VF-EI加点准则生成多保真度采样点,以此序列提升Co-Kriging多保真度近似模型的全局和局部近似精度。典型数值和工程算例验证了上述方法的有效性,相比径向基函数近似模型和Kriging模型,Co-Kriging多保真度近似建模优化方法的效率和精度更高,获得了相比初始设计减重11.5%的优化加筋圆锥壳结构,具有一定的工程应用价值。

, correspAuthors=null, authorNote=null, correspAuthorsNote=
王志祥,男,1992年生,江苏宿迁人,讲师;主要研究方向为结构分析与优化设计;E-mail:
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陈超磊,男,2000年生,江西宜春人,助理工程师;主要研究方向为结构优化;E-mail:

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Structure parameters table of the stiffened conical shell

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变量
Variable
初始值
Initial value
变量
Variable
初始值
Initial value
变量
Variable
初始值
Initial value
R1/mm4 750.0θDK/(°)4.0hfb/mm40.0
R2/mm3 750.0aZJK/mm25.0tfb/mm8.0
θ/(°)11.3bZJK/mm80.0wyy/mm80.0
aDK/mm46.0t1ZJK/mm2.0tyy/mm15.0
bDK/mm75.0t2ZJK/mm2.0tmp/mm1.5
cDK/mm6.0wUP/mm50.0nHT40
dDK/mm2.0tUP/mm6.0
), ArticleFig(id=1241779327143051485, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699534804415370, language=CN, label=表1, caption=

加筋圆锥壳结构参数表

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变量
Variable
初始值
Initial value
变量
Variable
初始值
Initial value
变量
Variable
初始值
Initial value
R1/mm4 750.0θDK/(°)4.0hfb/mm40.0
R2/mm3 750.0aZJK/mm25.0tfb/mm8.0
θ/(°)11.3bZJK/mm80.0wyy/mm80.0
aDK/mm46.0t1ZJK/mm2.0tyy/mm15.0
bDK/mm75.0t2ZJK/mm2.0tmp/mm1.5
cDK/mm6.0wUP/mm50.0nHT40
dDK/mm2.0tUP/mm6.0
), ArticleFig(id=1241779327277269214, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699534804415370, language=EN, label=Tab. 2, caption=

Calculation results of different scale grids in the reinforcement

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计算结果
Calculation result
筋格内网格数 Number of grids in the reinforcement
5×1010×1010×2015×2015×30
计算耗时
Computing time/h
0.580.610.740.921.03
耗时比
Time consuming ratio
0.560.590.720.891
极限载荷
Ultimate load/N
4.07×1073.39×1072.28×1072.15×1072.04×107
载荷误差
Load error/%
99.5166.1811.765.390
), ArticleFig(id=1241779327386321119, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699534804415370, language=CN, label=表2, caption=

筋格内不同规模网格计算结果

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计算结果
Calculation result
筋格内网格数 Number of grids in the reinforcement
5×1010×1010×2015×2015×30
计算耗时
Computing time/h
0.580.610.740.921.03
耗时比
Time consuming ratio
0.560.590.720.891
极限载荷
Ultimate load/N
4.07×1073.39×1072.28×1072.15×1072.04×107
载荷误差
Load error/%
99.5166.1811.765.390
), ArticleFig(id=1241779327478595808, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699534804415370, language=EN, label=Tab. 3, caption=

Value range of the reinforced conical shell structure parameters

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变量Variable上限Upper limit下限Lower limit
aDK/mm45.080.0
bDK/mm60.090.0
cDK/mm3.010.0
dDK/mm3.010.0
θDK/(°)4.05.0
aZJK/mm20.040.0
bZJK/mm75.0100.0
nHT40100
t1ZJK/mm3.010.0
t2ZJK/mm3.010.0
wUP/mm30.060.0
tUP/mm3.015.0
hfb/mm30.0100.0
tfb/mm3.015.0
wyy/mm50.0100.0
tyy/mm3.015.0
tmp/mm1.21.5
), ArticleFig(id=1241779327583453409, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699534804415370, language=CN, label=表3, caption=

加筋圆锥壳结构参数取值范围

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变量Variable上限Upper limit下限Lower limit
aDK/mm45.080.0
bDK/mm60.090.0
cDK/mm3.010.0
dDK/mm3.010.0
θDK/(°)4.05.0
aZJK/mm20.040.0
bZJK/mm75.0100.0
nHT40100
t1ZJK/mm3.010.0
t2ZJK/mm3.010.0
wUP/mm30.060.0
tUP/mm3.015.0
hfb/mm30.0100.0
tfb/mm3.015.0
wyy/mm50.0100.0
tyy/mm3.015.0
tmp/mm1.21.5
), ArticleFig(id=1241779327658950882, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699534804415370, language=EN, label=Tab. 4, caption=

Optimization results of reinforced conical shell structure

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变量
Variables
初始设计参数Initial design parameterRBFKrigingCo-Kriging
aDK/mm71.3262.2061.9362.37
bDK/mm82.7178.4972.9678.66
cDK/mm4.634.933.004.99
dDK/mm4.333.866.263.85
θDK/(°)4.064.584.444.57
aZJK/mm30.8833.2728.1032.82
bZJK/mm92.2991.9183.6191.71
nHT68447043
t1ZJK/mm3.563.034.833.03
t2ZJK/mm5.326.815.756.87
wUP/mm34.5148.3741.6647.75
tUP/mm5.387.306.787.31
hfb/mm75.0997.4677.8497.05
tfb/mm3.514.854.144.88
wyy/mm81.7074.3370.9574.29
tyy/mm11.1514.759.1214.43
tmp/mm1.481.231.311.23
M/kg3 270.842 963.373 149.872 892.99
Fcr/kN51 204.551 072.950 125.750 457.2
迭代次数
Number of iterations
23218
), ArticleFig(id=1241779327751225571, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699534804415370, language=CN, label=表4, caption=

加筋圆锥壳结构优化结果

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变量
Variables
初始设计参数Initial design parameterRBFKrigingCo-Kriging
aDK/mm71.3262.2061.9362.37
bDK/mm82.7178.4972.9678.66
cDK/mm4.634.933.004.99
dDK/mm4.333.866.263.85
θDK/(°)4.064.584.444.57
aZJK/mm30.8833.2728.1032.82
bZJK/mm92.2991.9183.6191.71
nHT68447043
t1ZJK/mm3.563.034.833.03
t2ZJK/mm5.326.815.756.87
wUP/mm34.5148.3741.6647.75
tUP/mm5.387.306.787.31
hfb/mm75.0997.4677.8497.05
tfb/mm3.514.854.144.88
wyy/mm81.7074.3370.9574.29
tyy/mm11.1514.759.1214.43
tmp/mm1.481.231.311.23
M/kg3 270.842 963.373 149.872 892.99
Fcr/kN51 204.551 072.950 125.750 457.2
迭代次数
Number of iterations
23218
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数据驱动的大型运载火箭加筋圆锥壳多保真度近似建模优化
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陈超磊 1 , 王志祥 2 , 雷勇军 2, 3 , 王婕 4
机械强度 | ·优化·可靠性· 2025,47(4): 148-157
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机械强度 | ·优化·可靠性· 2025, 47(4): 148-157
数据驱动的大型运载火箭加筋圆锥壳多保真度近似建模优化
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陈超磊1 , 王志祥2 , 雷勇军2, 3, 王婕4
作者信息
  • 1.中国人民解放军63768部队,西安 710600
  • 2.国防科技大学 空天科学学院,长沙 410073
  • 3.空天任务智能规划与仿真湖南省重点实验室,长沙 410073
  • 4.北京宇航系统工程研究所,北京 100076
  • 陈超磊,男,2000年生,江西宜春人,助理工程师;主要研究方向为结构优化;E-mail:

通讯作者:

王志祥,男,1992年生,江苏宿迁人,讲师;主要研究方向为结构分析与优化设计;E-mail:
Data driven multi-fidelity approximate modeling optimization of stiffened conical shell for large launch vehicle
Chaolei CHEN1 , Zhixiang WANG2 , Yongjun LEI2, 3, Jie WANG4
Affiliations
  • 1.Unit 63768 of the People’s Liberation Army of China, Xi’an 710600, China
  • 2.College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • 3.Hunan Key Laboratory of Intelligent Planning and Simulation for Aerospace Missions, Changsha 410073, China
  • 4.Beijing Institute of Aerospace Systems Engineering, Beijing 100076, China
出版时间: 2025-04-15 doi: 10.16579/j.issn.1001.9669.2025.04.018
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为提高大型运载火箭加筋圆锥壳舱段结构轴压承载效率,开展了数据驱动的加筋圆锥壳多保真度近似建模轻量化设计。针对单保真度近似建模优化方法效率不高、精度不足等问题,搭建了基于变可信度期望改进(Variable-Fidelity Expected Improvement, VF-EI)加点准则的数据驱动多保真度近似建模优化框架,并据此开展加筋圆锥壳结构轻量化设计。综合利用不同网格规模的加筋圆锥壳有限元模型,建立了加筋圆锥壳极限承载的Co-Kriging多保真度近似模型;优化迭代中,利用VF-EI加点准则生成多保真度采样点,以此序列提升Co-Kriging多保真度近似模型的全局和局部近似精度。典型数值和工程算例验证了上述方法的有效性,相比径向基函数近似模型和Kriging模型,Co-Kriging多保真度近似建模优化方法的效率和精度更高,获得了相比初始设计减重11.5%的优化加筋圆锥壳结构,具有一定的工程应用价值。

加筋圆锥壳  /  多保真度近似建模  /  序列近似优化方法  /  轻量化设计  /  VF-EI加点准则

In order to improve the load-bearing efficiency of the stiffened conical shell in large launch vehicle, the lightweight design of the stiffened conical shell was carried out via a data-driven multi-fidelity approximate modeling optimization method. Aiming at the problems such as low efficiency and insufficient accuracy of the single fidelity approximate modeling optimization method, a data-driven multi-fidelity approximate modeling optimization framework was built based on variable-fidelity expected improvement (VF-EI) point criterion,and accordingly the optimization design of stiffened conical shell structure was carried out. Based on the finite element models of stiffened conical shells with different mesh sizes, a Co-Kriging multi-fidelity approximate model for the collapse load of stiffened conical shells was established. In the optimization iteration, multi-fidelity sampling points were generated by using VF-EI point criterion, and the global and local approximation accuracy of Co-Kriging multi-fidelity approximation model was improved sequently. Moreover, the optimization efficiency and accuracy of the proposed method were demonstrated by comparing with radial basis function approximation model and Kriging model. Besides, 11. 5% weight reduction of the optimized stiffened conical shell structure is obtained compared with the initial design, which has certain engineering application value.

Stiffened conical shell  /  Multi-fidelity approximate modeling  /  Sequence approximate optimization method  /  Lightweight design  /  VF-EI point criterion
陈超磊, 王志祥, 雷勇军, 王婕. 数据驱动的大型运载火箭加筋圆锥壳多保真度近似建模优化. 机械强度, 2025 , 47 (4) : 148 -157 . DOI: 10.16579/j.issn.1001.9669.2025.04.018
Chaolei CHEN, Zhixiang WANG, Yongjun LEI, Jie WANG. Data driven multi-fidelity approximate modeling optimization of stiffened conical shell for large launch vehicle[J]. Journal of Mechanical Strength, 2025 , 47 (4) : 148 -157 . DOI: 10.16579/j.issn.1001.9669.2025.04.018
运载火箭加筋圆锥壳是典型的薄壁结构,由蒙皮和桁条组成,相比于非加筋圆锥壳结构,具有更高的轴压承载效率[1]。开展加筋圆锥壳舱段结构轻量化设计对提高运载能力、降低发射成本具有极其重要的意义[2]。在分析加筋圆锥壳结构后屈曲状态时,会面临有限元分析模型规模大、计算耗时长等问题,同时针对加筋圆锥壳结构开展轻量化设计会面临结构设计参数众多、连续变量和离散变量共存、优化求解困难的难题。目前针对大型火箭加筋圆锥壳结构轻量化设计的研究相对较少,而且随着尺度的增大,对结构有限元后屈曲分析效率提出了更高的要求[3],亟须发展一套更加完备的结构轻量化设计方法。
针对加筋板壳结构轻量化设计,主要的研究方式是采用基于近似模型的轻量化设计方法。近似模型亦称为代理模型或元模型,目前常用的基于单保真度样本数据信息的近似模型主要包括多项式响应面模型、径向基函数(Radical Basis Function, RBF)模型和Kriging近似模型等[4-5][6]3197-3225。展铭[7]基于近似模型对L型双加筋板结构开展轻量化设计,并通过试验验证了优化结果。针对航天器上的加筋柱壳结构,巩萃颖[8]基于改进近似模型对结构的几何尺寸和筋条数目进行轻量化设计。王博等[9-10]基于径向基函数近似模型建立开口加筋板结构设计框架,得到双层蒙皮网格加筋结构,相比传统网格加筋结构具有高轴压承载力的优点。王志祥等[11-12]通过建立大型运载火箭圆柱壳模型,提出采用基于近似模型和组合优化算法的序列近似方法对运载火箭蒙皮桁架结构开展轻质化研究。杨丽丽等[13]208-215采用一种结合径向基函数和自适应模拟退火算法的基于高保真度动态近似模型的全局优化算法,解决了某高维卫星结构优化问题,最终优化结果的预测误差仅为0.65%,且时间成本降低了50%以上。
虽然通过使用基于单保真度样本信息的近似模型能够较准确地拟合出结构参数-极限载荷的输入-输出非线性映射关系,但是在面对大型复杂加筋圆锥壳轻量化设计问题时,往往需要精细的有限元模型描述结构的力学响应,此时采用单保真度样本信息的近似模型会导致计算量大、优化周期长的问题。多保真度近似模型可以通过大量低保真度样本点建立近似模型,得到真实模型响应的特征趋势,再通过少量高保真度样本点信息对构建的近似模型进行修正,得到具有较高精度的近似模型[13]208-215。田阔[14]62-74综合利用等效模型的高效率和精细模型的高精度,建立了一种基于多保真竞争抽样的多级圆柱壳近似模型的后屈曲优化方法。为了进一步降低结构优化的成本,保证模型的准确性,李大帅[15]48-67提出了一种降维多保真Kriging模型的优化算法。在构建多保真度近似模型过程中,如何根据已观测信息合理选定新增样本点,从而提高模型的近似精度,是需要进一步解决的问题。基于Kriging近似模型,谢延敏等[16]提出了一种基于改善期望(Expected Improvement, EI)加点准则的改进并行加点策略,可以显著提高近似模型精度。高月华等[17]90-95从同时考虑预测响应值及其不确定性角度出发,明确了一种多点加点准则,并提出了采用该加点准则基于Kriging近似模型的序列近似优化方法。高伟等[18]121-128则是基于最大最小距离准则(Max-Min Distance, MD)和最小化近似模型预测准则(Minimize the Predictor, MP)提出另外一种使用所有近似模型的多点加点准则,同时兼顾了算法的全局搜索能力和局部开发能力。围绕基于数值模拟的优化问题,武泽平[19]通过分析现有黑箱函数优化函数的不足,提出了数值模拟-优化搜索协同迭代近似论方法,实现样本点数据的高效利用,显著提升了优化效率。王志祥[20]提出了基于搜索空间重构的多保真度序列采样方法,并在重型运载火箭集中力扩散舱段中取得良好的减重效果。圆锥壳相比于圆柱壳,在承受轴压载荷作用时传力路径有所不同,对于筋条会产生附加力矩,结构抗失稳能力变弱,开展结构优化设计更为复杂。国内外学者主要围绕加筋圆柱壳结构开展相关研究,而鲜有针对加筋圆锥壳结构优化的文章。本文将针对加筋圆锥壳结构,采用基于Co-Kriging多保真度近似模型[6]3197-3225序列优化方法开展轻量化设计研究。
本文在运载火箭轻量化设计的背景下,以运载火箭加筋圆锥壳级间段为研究对象。首先,介绍了基于Co-Kriging多保真度近似模型的近似建模方法,并通过算例测试说明建模方法的可行性;然后,为了改善基于增强Co-Kriging多保真度近似模型局部区域近似精度,采用变可信度期望改进(Variable-Fidelity Expected Improvement, VF-EI)加点准则进行序列采样;最后,通过基于多保真度近似模型的序列近似优化方法开展加筋圆锥壳结构轻量化设计。
图1所示,加筋圆锥壳结构由上下端框、桁条、蒙皮以及中间框构成。在加筋圆锥壳的蒙皮内侧,沿高度方向等间距安装3个“几”形截面中间框,顶部和底部安装2个“L”形截面端框,蒙皮外侧沿圆锥结构环向均匀分布数个“工”形截面的纵向桁条。图2展示了端框、中间框、桁条的截面构型。
针对加筋圆锥壳结构本文设置如下边界条件及加载条件:在加筋圆锥壳模型的顶部弹性边界面和底部弹性边界面的中心分别确定1个参考点,将2个参考点分别与对应边界面设为刚性耦合。此外,固定约束下参考点;约束上参考点除轴向位移的其余自由度,同时在上参考点匀速施加35 mm轴压位移。加筋圆锥壳的结构参数如表1所示,其中,R1为加筋圆锥壳顶部半径;R2为加筋圆锥壳底部半径;nHT为桁条的数量;tmp为蒙皮厚度。
在开展结构后屈曲分析时,讨论中间框与纵向桁条间的方格划分不同网格密度对有限元分析的影响,从而得到图3不同网格规模载荷位移曲线图[21]。由图3曲线图中各曲线峰值(即结构的极限载荷),可以看出网格数量与结构的极限载荷成反相关:网格划分越密,结构的极限载荷越小。结合表2中计算耗时以及载荷误差,选取方格内网格数10×20的圆锥壳网格为高保真度模型,选择方格内网格数5×10的圆锥壳网格为低保真度模型。
为进一步缩短低保真度模型分析时长,经过多次验算,可将低保真度全模型简化为半模型,施加相同的轴向位移,半模型承受载荷为全模型的一半。根据多保真度模型与低保真度模型有限元计算时间,确定低保真度样本点数量为多保真度样本点数量的3倍。
在满足加筋圆锥壳结构极限承载性能的前提下,使得结构质量更轻,将优化模型描述为
式中,x为加筋圆锥壳结构的17项设计参数,由连续变量和整数变量构成,其中桁条数量nHT为整数变量,其余结构参数为连续变量,优化求解为典型的混合整数优化。M (x)、Fcr(x)分别为加筋圆锥壳结构的结构质量和极限载荷;为加筋圆锥壳结构的最小极限承载力,为5×107 N;xmaxxmin分别为结构设计参数的上、下边界取值,上、下边界取值基于工程经验和大量试算结果,如表3所示。
基于多保真度近似模型开展结构轻量化设计综合利用不同保真度信息,提高优化效率,并采用VF-EI加点准则进行序列采样,提高优化精度,能够在极大程度上减少精细有限元模型的调用,显著缩短计算时间、提高优化效率。由于样本数量的限制,多保真度近似模型的精度受到限制,容易陷入局部最优。为了充分挖掘高/低精度模型之间的差异信息以及其他相关信息等,本文采用基于Co-Kriging多保真度近似模型的序列近似优化方法对加筋圆锥壳结构开展轻量化设计。
面向多保真度近似模型的初始样本集的选取方法按照高低保真度样本点关系一般来说分为两种:高/低保真度样本点非嵌套和高/低保真度样本点嵌套,即高保真度样本点是否为低保真度样本点的子集[22]。本文选取高/低保真度样本点嵌套的样本集作为多保真度初始样本集。
为了确保高/低保真度样本点之间满足嵌套的关系,PARK等[23]提供了一种移动高保真度样本点的最近邻域采样方法,以保证高保真度样本点是低保真度样本点的子集。首先,采用优化拉丁超立方设计(Optima| Latin Hypercube Sampling Design, OLHSD)方法,分别生成200组高保真度样本点和600组低保真度样本点;然后,对每一组高保真度样本从600组低保真度样本点中选取距离最近的样本点;最后,将高保真度样本点移动至对应低保真度样本点处。
图4展示了在二维0~1空间内产生40组低保真度样本点和10组高保真度样本点的流程。图4(a)为在40组低保真度样本点(十字图案)中找到与10组高保真度样本点(圆圈图案)对应距离最近的10组样本点(圆圈十字组合图案);图4(b)为将10组高保真度样本点(圆圈图案)移动并替换掉对应距离最近的10组样本点,即为最终的多保真度初始样本集。
Co-Kriging近似模型作为Kriging近似模型的拓展,继承了Kriging模型的优点,进一步建立了高/低保真度模型之间的联系,在航空航天等工程科学领域逐渐得到重视[14]62-74[15]48-67[24-26]。基于加法标度的多保真度模型可表示为
式中,yHF (x)为高保真度模型;yLF (x)为低保真度模型;ρ为高保真度模型与低保真度模型之间的缩放系数;δ(x)为高保真度模型与低保真度模型间的偏差模型。
实际上,Co-Kriging模型可理解为两类Kriging模型的融合。首先,基于低保真度训练样本集建立低保真度真实模型的Kriging模型;然后,在高保真度样本点处计算高保真度真实模型和低保真度真实模型的偏差,并建立该偏差模型的Kriging模型。从而可以将Co-Kriging模型表示为
根据Kriging模型,可以将低保真度真实模型yLF及真实偏差模型δ写为高斯随机过程的形式,为
式中,βLFβδ分别为高斯随机过程yLFδ的期望;ZLF (x)、Zδ (x)为均值为0、方差分别为的高斯随机过程。
通过R2关系数值衡量近似模型近似精度评估指标,其中R2越接近1模型精度越高[27]R2
式中,n为样本总数;yi为真实响应值;为近似模型预测值;为真实响应值的均值。
序列近似优化方法在采用初始样本点集建立得到近似模型后,通过加点准则对样本集更新,进而构建新的近似模型,然后逐次迭代得到精度更高的最优解。其中,最核心的部分是选用何种加点准则,不同的加点准则对下一步新构造的近似模型精度有显著影响[17]90-95[18]121-128
多保真度序列近似优化方法流程如图5所示。首先,构建优化问题的数学模型,确定设计参数、优化约束、设计空间以及优化指标;其次,采用最近邻域的采样方法,选取初始多保真度样本集,计算样本点对应的目标函数和约束函数的响应值;然后,构造近似模型并计算全局最优解,判断不满足收敛条件时,采用加点准则确定新增样本点,计算新样本点的目标函数值以及约束函数值,并更新训练样本集;最后,反复迭代直到满足式(7)的收敛条件,并输出优化结果。
式中,为近似模型的当前最优解;fout为当前最优解处的真实响应;N为当前迭代步数;Nmax为设置的最大迭代步数;δ为最大容许误差,取0.1%。
在序列加点优化方法中,最小化近似模型预测准则、改善期望准则、改善概率准则(Probability of Improvement, PI)等加点准则被广泛运用于搜索并产生新的样本点[28]。EI加点准则是JONES等[29]提出的一种近似模型模型加点准则,又称高效全局优化方法。该准则较好地平衡了局部探索与全局开发之间的权重,具有良好的全局寻优能力。在EI加点的基础上,如式(8)所示的VF-EI加点准则[EVFI (x,l)]被提出运用到多保真度近似模型序列优化中[30]
式中,l为不同保真度的样本点(高保真度或低保真度);ymin为当前最优的高/低保真度模型响应值;为Co-Kriging多保真度近似模型或低保真度近似模型的预测响应值;s(x,l)为Co-Kriging多保真度近似模型或低保真度近似模型在x处的预测标准差;Φ(·)、ϕ(·)分别为标准正态分布累计分布函数和标准正态分布概率密度函数。在最大化EVFI (xl)处新增采样点可有效平衡算法的开发和探索性能[31-33],因此新增样本点xnew表述为
选用式(10)给出的一维函数作为测试对象,在[0,1]区域内均匀选取21个样本点作为低保真度样本集WLF ={0:0.05:1},以该样本集建立低保真度近似模型,同时在低保真度样本集中选取4个样本点作为高保真度样本点集,为
图6(曲线重合)中,表示高保真度真实模型;表示采用多保真度初始样本集建立的多保真度Co-Kriging近似模型;表示低保真度真实模型;表示采用低保真度样本集建立的Kriging近似模型;箭头指向的点表示多保真度近似模型优化计算得到的最优点。而且经计算,多保真度近似模型的近似精度指标R2为0.884 71,表明建立的多保真度近似模型具有较高的全局近似精度,然而由算例测试结果图6可知其局部近似精度显然不足。
图7(曲线重合及曲线近乎重合)可以看出,对建立的多保真度近似模型通过一次VF-EI加点,将多保真度近似模型的近似精度指标从0.884 71提高至1,即多保真度近似模型非常接近真实响应函数。因此,通过VF-EI加点可以提高多保真度近似模型的局部近似精度,得到更加精确的全局近似最优解。
本文采用400组样本点作为基于RBF和Kriging近似模型序列近似优化的初始样本集,考虑优化效率,采取200组高保真度样本点及600组低保真度样本点作为基于Co-Kriging多保真度近似模型序列近似优化的初始样本集。
针对Co-Kriging多保真度近似模型,在多保真度初始样本集中的200组高保真度样本点集和600组低保真度样本点集中,分别随机选取190组高保真度样本点和570组低保真度样本点,构建多保真度近似模型和单保真度近似模型,用剩余10组高保真度样本点和30组低保真度样本点对近似模型的全局近似精度进行检验;针对Kriging和RBF单保真度近似模型,在400组高保真度样本点集中随机选取380组高保真度样本点构建单保真度近似模型,用剩余的20组高保真度样本检验近似模型的全局近似精度。为避免偶然因素的影响,采取15次重复试验,统计模型的近似精度评估指标如图8所示。图8中,F_RBF表示基于RBF模型建立的加筋圆锥壳模型的极限载荷近似精度评估指标;M_RBF表示基于RBF建立的加筋圆锥壳模型的结构质量近似精度评估指标,其他以此类推。
图8中Co-Kriging近似模型的近似精度指标R2均在0.975以上,显著高于Kriging近似模型和RBF近似模型。3种近似模型的近似精度指标都大于0.8,表明以上3种近似模型均具有较好的全局近似能力,可用于结构序列近似优化。
基于Co-Kriging多保真度近似模型的序列近似优化方法,采用Co-Kriging多保真度近似模型,初始样本集为200组高保真度样本及600组低保真度样本,通过VF-EI准则选取1个高保真度样本点以及1个低保真度样本点,优化过程最大迭代25次;在基于RBF和Kriging近似模型的序列近似优化方法,初始样本集都为400组高保真度样本,均通过选取最优点作为新增样本点,优化过程最大迭代25次。
采用基于Co-Kriging多保真度近似模型以及两种单保真度近似模型的序列近似优化方法,对加筋圆锥壳结构开展计算与研究,优化迭代历程如图9图10所示。图9图10中,下标opt表示优化后数值。为了在最大程度上利用已知信息,提高近似模型精度以及算法收敛效率,在每次迭代算出近似模型最优解真实响应后,将最优点也加入初始样本集。基于多保真度近似模型的序列近似优化方法,经过18次迭代后,加筋圆锥壳结构在满足极限承载力为5.0×107 N的约束条件下,得到加筋圆锥壳的结构质量为2 892. 99 kg,与迭代前的初始结构质量相比减重11. 5%,优化参数结果见表4。而采用基于Kriging及RBF近似模型的序列近似优化方法分析得到加筋圆锥壳结构质量最优分别为3 149. 87 kg及2 963. 37 kg,相比迭代前的初始结构质量相比分别减重3. 70%及9. 40%。采用基于Co-Kriging多保真度近似模型的序列近似优化方法的减重效果要显著优于基于Kriging近似模型及RBF近似模型的序列近似优化方法。
采用基于Co-Kriging代理模型的序列近似结构优化方法优化得到了加筋圆锥壳结构,对应的轴压位移-载荷曲线以及径向位移云图如图11所示。在对加筋圆锥壳结构加载至25.56 mm时,结构达到了承载极限5. 006×107 N,结构底部没有发生大的径向变形,中间部分区域有最大向圆锥壳内部的径向位移,随着位移的继续加载,结构轴向载荷迅速降低,结构发生整体的压溃破坏。对应结构的应力云图以及等效塑性应变云图如图12所示。优化后的加筋圆锥壳结构的最大应力达到1. 41×103 MPa,最大塑性应变为13. 1%,发生在“工”字形截面桁条的上翼缘与腹板位置,位于加筋圆锥壳下两个中间框之间的部分,在承受极限轴压载荷时桁条发生弯曲和扭转组合形式的破坏。
针对基于单保真度近似模型开展加筋圆锥壳结构轻质化设计过程中优化效率不高、精度不足等问题,提出了采用基于多保真度近似模型的序列近似优化方法,开展了系列研究,得出以下结论:
1)充分挖掘高/低精度模型之间的差异信息及其他相关信息,能够显著缩短计算时间、提高结构优化效率。
2)建立加筋圆锥壳结构模型并开展后屈曲分析,综合考虑网格密度对计算耗时和载荷误差的影响,将方格内划分10×20和5×10网格数的加筋圆锥壳模型作为高保真度和低保真度模型,构建了混合整数优化模型,设计了数据驱动的Co-Kriging多保真度近似建模优化框架。
3)基于Co-Kriging多保真度近似模型对加筋圆锥壳结构开展轻量化设计,得到相比于初始结构减重11.5%的优化结果,显著优于基于Kriging和RBF单保真度近似模型序列优化方法分别减重3. 70%、9. 40%的结果,验证了采用基于多保真度近似模型的序列近似优化方法对大型运载火箭加筋圆锥壳结构轻量化设计的有效性。
  • 湖南省自然科学基金项目(2020JJ5650)
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2025年第47卷第4期
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doi: 10.16579/j.issn.1001.9669.2025.04.018
  • 接收时间:2023-08-13
  • 首发时间:2026-03-20
  • 出版时间:2025-04-15
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  • 收稿日期:2023-08-13
  • 修回日期:2023-09-01
基金
Natural Science Foundation of Hunan(2020JJ5650)
湖南省自然科学基金项目(2020JJ5650)
作者信息
    1.中国人民解放军63768部队,西安 710600
    2.国防科技大学 空天科学学院,长沙 410073
    3.空天任务智能规划与仿真湖南省重点实验室,长沙 410073
    4.北京宇航系统工程研究所,北京 100076

通讯作者:

王志祥,男,1992年生,江苏宿迁人,讲师;主要研究方向为结构分析与优化设计;E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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