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To enhance the computational efficiency of structural lightweight design for complex structures, a structural lightweight design method based on the Kriging surrogate model is proposed. The proposed method incorporates a hybrid addition strategy and a sample deletion strategy considering a distance threshold,aiming to rapidly improve the fitting accuracy of the Kriging surrogate model. This model was then applied to a multi-objective lightweight design model of the truck frame, with the optimization objectives of minimizing frame mass and maximum stress. Subsequently, the multi-objective lightweight model was solved using the non-dominated sorting genetic algorithm-II (NSGA-II). The results demonstrate that the proposed hybrid addition strategy and sample deletion strategy considering the distance threshold effectively enhance the update process of the Kriging surrogate model. The structural lightweight design method based on the Kriging surrogate model exhibits significant advantages in both computational efficiency and lightweight performance.
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为提高复杂结构轻量化设计的计算效率,提出一种基于Kriging代理模型的复杂结构轻量化设计方法。所提方法融合了混合加点策略和考虑距离阈值的样本删除策略,旨在快速提高Kriging代理模型的拟合精度,进而应用于以最小化构架质量和最大应力为优化目标的转向架构架多目标轻量化模型中。然后,通过第二代非支配排序遗传算法(Nondominated Sorting Genetic Algorithm-Ⅱ, NSGA-Ⅱ)对多目标轻量化模型求解。结果表明,所提出的混合加点策略和考虑距离阈值的样本删除策略有效地改善了Kriging代理模型的更新进程,基于Kriging代理模型的复杂结构轻量化设计方法在计算效率和轻量化效果上具有显著优势。
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王玮琪,男,1999年生,湖南娄底人,在读硕士研究生;主要研究方向为结构优化;E-mail:1244195215@qq.com。
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Curve of model error-Euclidean distance, figureFileSmall=aQbkckiOD4cd+zyxQk3m5w==, figureFileBig=CIY1imxVhyxguGFv7b1abQ==, tableContent=null), ArticleFig(id=1228282210571190632, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图1, caption=
模型误差-欧氏距离的关系曲线, figureFileSmall=aQbkckiOD4cd+zyxQk3m5w==, figureFileBig=CIY1imxVhyxguGFv7b1abQ==, tableContent=null), ArticleFig(id=1228282210755740021, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.2, caption=
CRH380 trailer truck frame, figureFileSmall=jPLhhH0oYm3EOlQqAggQGQ==, figureFileBig=M90Hlo5e8owkm1zsTFpIKw==, tableContent=null), ArticleFig(id=1228282210843820409, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图2, caption=
CRH380拖车转向架构架, figureFileSmall=jPLhhH0oYm3EOlQqAggQGQ==, figureFileBig=M90Hlo5e8owkm1zsTFpIKw==, tableContent=null), ArticleFig(id=1228282210923512193, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.3, caption=
Load application conditions of the frame, figureFileSmall=EA0Qs/wKSKuCXK0OZT0M+Q==, figureFileBig=c2Gdmfp5pFmfJpdug8NEjw==, tableContent=null), ArticleFig(id=1228282211019981189, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图3, caption=
构架载荷的添加情况, figureFileSmall=EA0Qs/wKSKuCXK0OZT0M+Q==, figureFileBig=c2Gdmfp5pFmfJpdug8NEjw==, tableContent=null), ArticleFig(id=1228282211116450186, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.4, caption=
Stress nephogram of the frame, figureFileSmall=R+qvM/TmsPQcv91Of4Cxjw==, figureFileBig=mNJA7lTfYUXvtCgnwe2n4A==, tableContent=null), ArticleFig(id=1228282211217113487, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图4, caption=
构架的应力云图, figureFileSmall=R+qvM/TmsPQcv91Of4Cxjw==, figureFileBig=mNJA7lTfYUXvtCgnwe2n4A==, tableContent=null), ArticleFig(id=1228282211292610962, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.5, caption=
Distribution of the initial sample, figureFileSmall=PayLUM/3KDUaPZMbxzg79A==, figureFileBig=aiNNjuaMy7oma7R9xRB37w==, tableContent=null), ArticleFig(id=1228282211368108442, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图5, caption=
初始样本的分布情况, figureFileSmall=PayLUM/3KDUaPZMbxzg79A==, figureFileBig=aiNNjuaMy7oma7R9xRB37w==, tableContent=null), ArticleFig(id=1228282211435217310, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.6, caption=
Flow chart of solving multi-objective optimization problem based on hybrid addition Kriging model, figureFileSmall=52WOmPV+Wx52OC9bmLUaRQ==, figureFileBig=GFuH+ZL0JBQk/JLJzV2CWw==, tableContent=null), ArticleFig(id=1228282211519103393, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图6, caption=
基于混合加点Kriging模型求解多目标优化问题的流程, figureFileSmall=52WOmPV+Wx52OC9bmLUaRQ==, figureFileBig=GFuH+ZL0JBQk/JLJzV2CWw==, tableContent=null), ArticleFig(id=1228282211632349605, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.7, caption=
Variation of the relative error of f1 with update algebra, figureFileSmall=wTA38xEy42kap3eLpTysrA==, figureFileBig=diN7w26l/IkcFanKaPyw+g==, tableContent=null), ArticleFig(id=1228282211733012906, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图7, caption=
f1相对误差随更新代数的变化过程, figureFileSmall=wTA38xEy42kap3eLpTysrA==, figureFileBig=diN7w26l/IkcFanKaPyw+g==, tableContent=null), ArticleFig(id=1228282211825287599, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.8, caption=
Variation of the relative error of f2 with update algebra, figureFileSmall=+IHEprKd3gtCjP4/pVm/AQ==, figureFileBig=yq4tHaavmiXbCcsd/2CH6Q==, tableContent=null), ArticleFig(id=1228282213184242098, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图8, caption=
f2相对误差随更新代数的变化过程, figureFileSmall=+IHEprKd3gtCjP4/pVm/AQ==, figureFileBig=yq4tHaavmiXbCcsd/2CH6Q==, tableContent=null), ArticleFig(id=1228282213352014263, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.9, caption=
Distribution of sample points under each criterion, figureFileSmall=V4cwu7kkI79zMDBpGWW1Ag==, figureFileBig=tQYuHaSSYpGYwHpfgGFIkQ==, tableContent=null), ArticleFig(id=1228282213440094652, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图9, caption=
各准则下的样本点分布情况, figureFileSmall=V4cwu7kkI79zMDBpGWW1Ag==, figureFileBig=tQYuHaSSYpGYwHpfgGFIkQ==, tableContent=null), ArticleFig(id=1228282213511397823, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.10, caption=
Pareto frontier solution set, figureFileSmall=yTl7/0gLEqlmRzjIhilUsA==, figureFileBig=yPp1GG/FZk8Au94zuVr00Q==, tableContent=null), ArticleFig(id=1228282213645615556, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图10, caption=
Pareto前沿解集, figureFileSmall=yTl7/0gLEqlmRzjIhilUsA==, figureFileBig=yPp1GG/FZk8Au94zuVr00Q==, tableContent=null), ArticleFig(id=1228282213763056073, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.11, caption=
Comparison of total sample number, figureFileSmall=6WaMREbLeFYVe/voHXx3hw==, figureFileBig=5uUJwqnRtspZloLxdhO2BQ==, tableContent=null), ArticleFig(id=1228282213914051024, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图11, caption=
总样本数对比, figureFileSmall=6WaMREbLeFYVe/voHXx3hw==, figureFileBig=5uUJwqnRtspZloLxdhO2BQ==, tableContent=null), ArticleFig(id=1228282214031491537, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Fig.12, caption=
Stress nephogram of the frame, figureFileSmall=XLhQ9iyIETZ27Uf4syA3RQ==, figureFileBig=lRdHih0VTOVppZsWudRiXg==, tableContent=null), ArticleFig(id=1228282214132154837, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=图12, caption=
构架应力云图, figureFileSmall=XLhQ9iyIETZ27Uf4syA3RQ==, figureFileBig=lRdHih0VTOVppZsWudRiXg==, tableContent=null), ArticleFig(id=1228282214190875096, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Tab.1, caption=
Decision variables and their distribution
, figureFileSmall=null, figureFileBig=null, tableContent=
变量 Variables | 分布类型 Distribution | 均值 Mean value | 标准差 Standard deviation |
|---|
上盖板厚度 Thickness of upper plate t1/mm | 正态分布 Normal distribution | 14 | 0.42 |
下盖板厚度 Thickness of lower plate t2/mm | 正态分布 Normal distribution | 18 | 0.54 |
横梁壁厚度 Thickness of cross beam t3/mm | 正态分布 Normal distribution | 10 | 0.30 |
), ArticleFig(id=1228282214287344091, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=表1, caption=
决策变量及其分布情况
, figureFileSmall=null, figureFileBig=null, tableContent=
变量 Variables | 分布类型 Distribution | 均值 Mean value | 标准差 Standard deviation |
|---|
上盖板厚度 Thickness of upper plate t1/mm | 正态分布 Normal distribution | 14 | 0.42 |
下盖板厚度 Thickness of lower plate t2/mm | 正态分布 Normal distribution | 18 | 0.54 |
横梁壁厚度 Thickness of cross beam t3/mm | 正态分布 Normal distribution | 10 | 0.30 |
), ArticleFig(id=1228282214367035871, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Tab.2, caption=
Comparison of addition results
, figureFileSmall=null, figureFileBig=null, tableContent=
方法 Method | 代数 Algebra | 样本数 Sample number | 误差 Error | 时间 Time/s |
|---|
| EI | 9 | 46 | [9.568×10-4,1.057×10-5] | 22.78 |
| EI+LCB | 8 | 58 | [8.130×10-4,1.881×10-10] | 37.74 |
| EI+Distance | 5 | 42 | [3.429×10-5,6.983×10-4] | 12.47 |
), ArticleFig(id=1228282214614499812, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=表2, caption=
加点结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
方法 Method | 代数 Algebra | 样本数 Sample number | 误差 Error | 时间 Time/s |
|---|
| EI | 9 | 46 | [9.568×10-4,1.057×10-5] | 22.78 |
| EI+LCB | 8 | 58 | [8.130×10-4,1.881×10-10] | 37.74 |
| EI+Distance | 5 | 42 | [3.429×10-5,6.983×10-4] | 12.47 |
), ArticleFig(id=1228282214715163110, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Tab.3, caption=
Evaluation of the multi-objective solution set of MOP6 function under each criterion
, figureFileSmall=null, figureFileBig=null, tableContent=
| 未用准则 Unapplied criterion | EI准则 EI criterion | EI+LCB准则 EI+LCB criterion | EI+Distance准则 EI+Distance criterion |
|---|
| GD | 0.012 8 | 0.008 4 | 0.008 3 | 0.008 1 |
| IGD | 0.196 4 | 0.066 1 | 0.093 7 | 0.068 8 |
| HV | 0.492 1 | 0.390 4 | 0.398 5 | 0.393 8 |
| Spread | 0.859 1 | 0.932 1 | 0.937 6 | 0.897 1 |
| Spacing | 0.004 8 | 0.004 7 | 0.004 1 | 0.003 6 |
), ArticleFig(id=1228282214778077676, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=表3, caption=
各准则下MOP6函数多目标解集评价
, figureFileSmall=null, figureFileBig=null, tableContent=
| 未用准则 Unapplied criterion | EI准则 EI criterion | EI+LCB准则 EI+LCB criterion | EI+Distance准则 EI+Distance criterion |
|---|
| GD | 0.012 8 | 0.008 4 | 0.008 3 | 0.008 1 |
| IGD | 0.196 4 | 0.066 1 | 0.093 7 | 0.068 8 |
| HV | 0.492 1 | 0.390 4 | 0.398 5 | 0.393 8 |
| Spread | 0.859 1 | 0.932 1 | 0.937 6 | 0.897 1 |
| Spacing | 0.004 8 | 0.004 7 | 0.004 1 | 0.003 6 |
), ArticleFig(id=1228282214874546670, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Tab.4, caption=
Comparison of optimization results of the frame structure
, figureFileSmall=null, figureFileBig=null, tableContent=
变量 Variables | 原始参数 Original parameters | 直接优化 Direct optimization | 径向基函数神经网络 RBFNN | 所提方法 Proposed method |
|---|
| t1/mm | 14.00 | 14.00 | 13.62 | 12.75 |
| t2/mm | 18.00 | 18.00 | 16.06 | 18.45 |
| t3/mm | 10.00 | 9.00 | 11.01 | 10.51 |
| SStress/MPa | 306.90 | 309.30 | 343.99 | 311.89 |
| mMass/kg | 1 205.67 | 1 197.59 | 1 190.68 | 1 196.69 |
总样本数 Total sample number | — | 125 | 45 | 37 |
), ArticleFig(id=1228282214966821362, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=表4, caption=
构架结构优化结果的对比
, figureFileSmall=null, figureFileBig=null, tableContent=
变量 Variables | 原始参数 Original parameters | 直接优化 Direct optimization | 径向基函数神经网络 RBFNN | 所提方法 Proposed method |
|---|
| t1/mm | 14.00 | 14.00 | 13.62 | 12.75 |
| t2/mm | 18.00 | 18.00 | 16.06 | 18.45 |
| t3/mm | 10.00 | 9.00 | 11.01 | 10.51 |
| SStress/MPa | 306.90 | 309.30 | 343.99 | 311.89 |
| mMass/kg | 1 205.67 | 1 197.59 | 1 190.68 | 1 196.69 |
总样本数 Total sample number | — | 125 | 45 | 37 |
), ArticleFig(id=1228282215075873268, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=EN, label=Tab.5, caption=
Statistical comparison of the best scheme
, figureFileSmall=null, figureFileBig=null, tableContent=
变量及优化目标 Variables and optimization objective | 径向基函数神经网络 RBFNN | 所提方法 Proposed method |
|---|
均值 Mean value | 方差 Standard deviation | 均值 Mean value | 方差 Standard deviation |
|---|
| t1/mm | 15.16 | 1.55 | 13.66 | 0.50 |
| t2/mm | 17.35 | 2.28 | 18.36 | 0.61 |
| t3/mm | 8.89 | 1.78 | 9.35 | 0.67 |
| SStress/MPa | 341.04 | 47.18 | 310.12 | 2.34 |
| mMass/kg | 1 204.08 | 18.71 | 1 190.94 | 13.03 |
), ArticleFig(id=1228282215142982138, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282197627568924, language=CN, label=表5, caption=
最优方案的统计对比
, figureFileSmall=null, figureFileBig=null, tableContent=
变量及优化目标 Variables and optimization objective | 径向基函数神经网络 RBFNN | 所提方法 Proposed method |
|---|
均值 Mean value | 方差 Standard deviation | 均值 Mean value | 方差 Standard deviation |
|---|
| t1/mm | 15.16 | 1.55 | 13.66 | 0.50 |
| t2/mm | 17.35 | 2.28 | 18.36 | 0.61 |
| t3/mm | 8.89 | 1.78 | 9.35 | 0.67 |
| SStress/MPa | 341.04 | 47.18 | 310.12 | 2.34 |
| mMass/kg | 1 204.08 | 18.71 | 1 190.94 | 13.03 |
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