Article(id=1149735934079451142, tenantId=1146029695717560320, journalId=1146031787341344770, issueId=1149735925967663173, articleNumber=1003-3033(2024)10-0050-08, orderNo=null, doi=10.16265/j.cnki.issn1003-3033.2024.10.1718, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1713542400000, receivedDateStr=2024-04-20, revisedDate=1721491200000, revisedDateStr=2024-07-21, acceptedDate=null, acceptedDateStr=null, onlineDate=1752048007744, onlineDateStr=2025-07-09, pubDate=1730044800000, pubDateStr=2024-10-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1752048007744, onlineIssueDateStr=2025-07-09, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1752048007744, creator=13701087609, updateTime=1752048007744, updator=13701087609, issue=Issue{id=1149735925967663173, tenantId=1146029695717560320, journalId=1146031787341344770, year='2024', volume='34', issue='10', pageStart='1', pageEnd='252', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1752048005811, creator=13701087609, updateTime=1756361993174, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1167830100474082271, tenantId=1146029695717560320, journalId=1146031787341344770, issueId=1149735925967663173, language=EN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1167830100478276576, tenantId=1146029695717560320, journalId=1146031787341344770, issueId=1149735925967663173, language=CN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=50, endPage=57, ext={EN=ArticleExt(id=1149735934259806215, articleId=1149735934079451142, tenantId=1146029695717560320, journalId=1146031787341344770, language=EN, title=Multi-objective prediction and optimization of large-diameter slurry shield posture based on CatBoost-MOEAD, columnId=1149733269173878863, journalTitle=China Safety Science Journal, columnName=Safety engineering technology, runingTitle=null, highlight=null, articleAbstract=
To avoid abnormal attitude problems such as serpentine and axis deviation during shield tunneling affecting construction safety,a large-diameter slurry shield attitude control method combining CatBoost algorithm and MOEAD. A shield posture prediction model was developed with 19 input parameters and 6 output parameters,and the CatBoost algorithm was used to develop a nonlinear mapping relationship between input and output parameters. The SHAP was used to analyze the effects of input parameters on shield posture. The CatBoost-MOEAD shield posture multi-objective optimization model was coupled with the multi-objective optimization algorithm. Then the proposed model performance was validated against the Wuhan Yangtze River large-diameter slurry shield tunnel project. The results showed that the CatBoost prediction model can efficiently predict the posture of large-diameter mud-water shields. The determination coefficients of the six shield posture objectives ranged from 0.931 to 0.974,the root-mean-square errors ranged from 0.030 to 0.880,and the errors ranged from 0.039 to 1.057. The thrust of the propulsion group has the most significant impact on shield attitude among the major construction parameters. The proposed CatBoost-MOEAD multi-objective optimization method for shield attitude had a great performance in optimization effect with a maximum value of 38.86%.
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为避免盾构掘进过程中出现蛇形、轴线偏离等姿态异常问题影响施工安全,提出一种结合类别提升(CatBoost)算法和基于分解的多目标优化算法(MOEAD)的大直径泥水盾构姿态控制方法;构建一个盾构姿态预测模型,该模型包含19个输入参数和6个输出参数,利用CatBoost算法构建输入参数与输出参数之间的非线性映射关系;采用沙普利加性解释法(SHAP)分析输入参数对盾构姿态的影响;结合多目标优化算法构建CatBoost-MOEAD盾构姿态多目标优化模型,将所提模型运用到武汉长江大直径泥水盾构隧道工程中,分析验证所提方法的适用性和有效性。结果表明: CatBoost预测模型能够高效地预测大直径泥水盾构的姿态,其中6个盾构姿态目标的决定系数范围为0.931~0.974,均方根误差范围为0.030~0.880,误差范围为0.039~1.057;对盾构姿态影响较大的施工参数中推进组推力对盾构姿态的影响最为显著;通过研发的CatBoost-MOEAD盾构姿态多目标优化方法,盾构姿态的优化效果显著,优化率可达38.86%。
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吴贤国 (1964—),女,湖北武汉人,博士,教授,主要从事数字工程集成建设关键技术及应用、隧道工程施工与运营安全监控等方面的研究。E-mail:wuxg@hust.edu.cn。
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吴贤国 (1964—),女,湖北武汉人,博士,教授,主要从事数字工程集成建设关键技术及应用、隧道工程施工与运营安全监控等方面的研究。E-mail:wuxg@hust.edu.cn。
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吴贤国 (1964—),女,湖北武汉人,博士,教授,主要从事数字工程集成建设关键技术及应用、隧道工程施工与运营安全监控等方面的研究。E-mail:wuxg@hust.edu.cn。
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GB 50446-2017,Code for construction and acceptance of shield tunnelling method[S]., articleTitle=null, refAbstract=null)], funds=[Fund(id=1167811962437120477, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, awardId=51378235, language=CN, fundingSource=国家自然科学基金资助(51378235), fundOrder=null, country=null), Fund(id=1167811962491646430, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, awardId=71571078, language=CN, fundingSource=国家自然科学基金资助(71571078), fundOrder=null, country=null), Fund(id=1167811962537783775, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, awardId=51308240, language=CN, fundingSource=国家自然科学基金资助(51308240), fundOrder=null, country=null), Fund(id=1167811962621669856, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, awardId=2016YFC0800208, language=CN, fundingSource=国家重点研发计划(2016YFC0800208), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1167811957299098003, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, xref=1, ext=[AuthorCompanyExt(id=1167811957353623956, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, companyId=1167811957299098003, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1 School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan Hubei 430074,China), AuthorCompanyExt(id=1167811957378789781, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, companyId=1167811957299098003, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1 华中科技大学 土木与水利工程学院,湖北 武汉 430074)]), AuthorCompany(id=1167811957450092950, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, xref=2, ext=[AuthorCompanyExt(id=1167811957458481560, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, companyId=1167811957450092950, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2 Wuhan Huazhong University of Science and Technology Test Technology Co.,Ltd.,Wuhan Hubei 430074,China), AuthorCompanyExt(id=1167811957471064473, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, companyId=1167811957450092950, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2 武汉华中科大检测科技有限公司,湖北 武汉 430074)])], figs=[ArticleFig(id=1167811960142836171, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=EN, label=Fig.1, caption=
Prediction results of six shield posture parameters, figureFileSmall=kaSC0Jp5P4oOSDyp3m0wkw==, figureFileBig=fg09I5RTA0GfMOhDVMC9GA==, tableContent=null), ArticleFig(id=1167811960251888076, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=CN, label=图1, caption=
6个盾构机姿态参数的预测结果, figureFileSmall=kaSC0Jp5P4oOSDyp3m0wkw==, figureFileBig=fg09I5RTA0GfMOhDVMC9GA==, tableContent=null), ArticleFig(id=1167811960314802637, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=EN, label=Fig.2, caption=
Effects of input parameters on shield posture SHAP analysis results, figureFileSmall=2yvqTBoFp2vMMzuxWjfq7w==, figureFileBig=DgKrRGHXDhJjeROWKAWHvA==, tableContent=null), ArticleFig(id=1167811960486769102, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=CN, label=图2, caption=
输入参数对盾构姿态的SHAP分析结果, figureFileSmall=2yvqTBoFp2vMMzuxWjfq7w==, figureFileBig=DgKrRGHXDhJjeROWKAWHvA==, tableContent=null), ArticleFig(id=1167811960562266575, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=EN, label=Table 1, caption=
Initial value
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | 数据 | 变量 | 数据 |
最大 值 | 最小 值 | 平均 值 | 最大 值 | 最小 值 | 平 均值 |
/ (mm·min-1) | 32.71 | 28.12 | 30.55 | x14 ×105 Pa | 8.59 | 5.46 | 7.04 |
/ (r·min-1) | 1.21 | 0.91 | 1.12 | x15 ×105 Pa | 8.94 | 6.43 | 7.70 |
| /kN | 94 708 | 81 493 | 87 378 | /m | 0.16 | 0 | 0.06 |
| /kN | 11 440 | 6 218 | 9 296 | x17 ×105 Pa | 3.98 | 3.62 | 3.82 |
| /kN | 11 917 | 6 710 | 8 329 | /kN | 30.00 | 26.00 | 27.99 |
| /kN | 23 872 | 13 623 | 18 721 | /(°) | 16.00 | 8.00 | 11.98 |
| /kN | 15 135 | 11 901 | 13 559 | /mm | -18 | -54 | -39 |
| /kN | 20 121 | 12 368 | 16 119 | /mm | 54 | 20 | 37 |
| /kN | 26 715 | 16 386 | 21 353 | /mm | -44 | -61 | -52 |
/ (t·m-3) | 1.43 | 1.36 | 1.39 | / mm | 50 | 39 | 45 |
/ (t·m-3) | 1.49 | 1.41 | 1.45 | / (mm· m-1) | -24 | -29 | -27 |
/ (m3·h-1) | 3 026 | 2 142 | 2 578 | / (mm· m-1) | 4.65 | 3.03 | 3.93 |
/ (m3·h-1) | 3 104 | 2 332 | 2 657 | — | — | — | — |
), ArticleFig(id=1167811960662929872, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=CN, label=表1, caption=
初始数据
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | 数据 | 变量 | 数据 |
最大 值 | 最小 值 | 平均 值 | 最大 值 | 最小 值 | 平 均值 |
/ (mm·min-1) | 32.71 | 28.12 | 30.55 | x14 ×105 Pa | 8.59 | 5.46 | 7.04 |
/ (r·min-1) | 1.21 | 0.91 | 1.12 | x15 ×105 Pa | 8.94 | 6.43 | 7.70 |
| /kN | 94 708 | 81 493 | 87 378 | /m | 0.16 | 0 | 0.06 |
| /kN | 11 440 | 6 218 | 9 296 | x17 ×105 Pa | 3.98 | 3.62 | 3.82 |
| /kN | 11 917 | 6 710 | 8 329 | /kN | 30.00 | 26.00 | 27.99 |
| /kN | 23 872 | 13 623 | 18 721 | /(°) | 16.00 | 8.00 | 11.98 |
| /kN | 15 135 | 11 901 | 13 559 | /mm | -18 | -54 | -39 |
| /kN | 20 121 | 12 368 | 16 119 | /mm | 54 | 20 | 37 |
| /kN | 26 715 | 16 386 | 21 353 | /mm | -44 | -61 | -52 |
/ (t·m-3) | 1.43 | 1.36 | 1.39 | / mm | 50 | 39 | 45 |
/ (t·m-3) | 1.49 | 1.41 | 1.45 | / (mm· m-1) | -24 | -29 | -27 |
/ (m3·h-1) | 3 026 | 2 142 | 2 578 | / (mm· m-1) | 4.65 | 3.03 | 3.93 |
/ (m3·h-1) | 3 104 | 2 332 | 2 657 | — | — | — | — |
), ArticleFig(id=1167811960826507729, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=EN, label=Table 2, caption=
Hyperparameter optimization results of CatBoost under different shield posture prediction objectives
, figureFileSmall=null, figureFileBig=null, tableContent=
| 超参数 | mm | mm | mm | mm | (mm·m-1) | (mm·m-1) |
L2正则 化参数 | 4 | 3 | 8 | 7 | 9 | 3 |
| 学习率 | 0.146 | 0.100 | 0.066 | 0.171 | 0.080 | 0.124 |
树的最 大深度 | 6 | 8 | 6 | 6 | 6 | 8 |
), ArticleFig(id=1167811960889422290, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=CN, label=表2, caption=
CatBoost在不同盾构姿态预测目标下超参数优化结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 超参数 | mm | mm | mm | mm | (mm·m-1) | (mm·m-1) |
L2正则 化参数 | 4 | 3 | 8 | 7 | 9 | 3 |
| 学习率 | 0.146 | 0.100 | 0.066 | 0.171 | 0.080 | 0.124 |
树的最 大深度 | 6 | 8 | 6 | 6 | 6 | 8 |
), ArticleFig(id=1167811960956531155, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=EN, label=Table 3, caption=
Comparison of shield posture prediction accuracy
, figureFileSmall=null, figureFileBig=null, tableContent=
机器学习 算法 | 预测 精度 | 盾构姿态预测目标 |
| | | | | | |
| CatBoost | R2 | 0.931 | 0.951 | 0.966 | 0.956 | 0.974 | 0.970 |
| RMSE | 0.429 | 0.467 | 0.880 | 0.705 | 0.054 | 0.030 |
| MAE | 0.535 | 0.578 | 1.057 | 0.824 | 0.065 | 0.039 |
| XGBoost | R2 | 0.928 | 0.942 | 0.961 | 0.948 | 0.964 | 0.957 |
| RMSE | 0.436 | 0.512 | 0.972 | 0.755 | 0.064 | 0.037 |
| MAE | 0.547 | 0.631 | 1.145 | 0.903 | 0.076 | 0.046 |
| RF | R2 | 0.924 | 0.935 | 0.954 | 0.942 | 0.953 | 0.937 |
| RMSE | 0.446 | 0.551 | 1.058 | 0.805 | 0.074 | 0.045 |
| MAE | 0.562 | 0.669 | 1.241 | 0.948 | 0.087 | 0.056 |
| SVM | R2 | 0.916 | 0.925 | 0.946 | 0.930 | 0.944 | 0.926 |
| RMSE | 0.470 | 0.589 | 1.126 | 0.878 | 0.080 | 0.050 |
| MAE | 0.589 | 0.716 | 1.336 | 1.044 | 0.095 | 0.060 |
| BPNN | R2 | 0.908 | 0.920 | 0.937 | 0.913 | 0.929 | 0.916 |
| RMSE | 0.494 | 0.606 | 1.245 | 0.985 | 0.091 | 0.053 |
| MAE | 0.615 | 0.739 | 1.446 | 1.163 | 0.107 | 0.065 |
), ArticleFig(id=1167811961036222932, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=CN, label=表3, caption=
盾构姿态预测精度对比
, figureFileSmall=null, figureFileBig=null, tableContent=
机器学习 算法 | 预测 精度 | 盾构姿态预测目标 |
| | | | | | |
| CatBoost | R2 | 0.931 | 0.951 | 0.966 | 0.956 | 0.974 | 0.970 |
| RMSE | 0.429 | 0.467 | 0.880 | 0.705 | 0.054 | 0.030 |
| MAE | 0.535 | 0.578 | 1.057 | 0.824 | 0.065 | 0.039 |
| XGBoost | R2 | 0.928 | 0.942 | 0.961 | 0.948 | 0.964 | 0.957 |
| RMSE | 0.436 | 0.512 | 0.972 | 0.755 | 0.064 | 0.037 |
| MAE | 0.547 | 0.631 | 1.145 | 0.903 | 0.076 | 0.046 |
| RF | R2 | 0.924 | 0.935 | 0.954 | 0.942 | 0.953 | 0.937 |
| RMSE | 0.446 | 0.551 | 1.058 | 0.805 | 0.074 | 0.045 |
| MAE | 0.562 | 0.669 | 1.241 | 0.948 | 0.087 | 0.056 |
| SVM | R2 | 0.916 | 0.925 | 0.946 | 0.930 | 0.944 | 0.926 |
| RMSE | 0.470 | 0.589 | 1.126 | 0.878 | 0.080 | 0.050 |
| MAE | 0.589 | 0.716 | 1.336 | 1.044 | 0.095 | 0.060 |
| BPNN | R2 | 0.908 | 0.920 | 0.937 | 0.913 | 0.929 | 0.916 |
| RMSE | 0.494 | 0.606 | 1.245 | 0.985 | 0.091 | 0.053 |
| MAE | 0.615 | 0.739 | 1.446 | 1.163 | 0.107 | 0.065 |
), ArticleFig(id=1167811961166246357, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=EN, label=Table 4, caption=
Input parameter range
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| 输入参数 | 参数范围 | 输入参数 | 参数范围 |
(r·min-1) | [0.9,1.3] | /kN | [12 000,20 200] |
| kN | [81 500,94 800] | /kN | [16 300,26 800] |
| kN | [6 200,12 000] | /(t·m-3) | [1.3,1.5] |
| kN | [6 200,12 000] | /(t·m-3) | [1.3,1.5] |
| kN | [13 600,239 000] | /(m3·h-1) | [2 140,3 030] |
| kN | [12 000,15 200] | x17×105 Pa | [3.3,3.4] |
), ArticleFig(id=1167811961296269782, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=CN, label=表4, caption=
输入参数范围
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| 输入参数 | 参数范围 | 输入参数 | 参数范围 |
(r·min-1) | [0.9,1.3] | /kN | [12 000,20 200] |
| kN | [81 500,94 800] | /kN | [16 300,26 800] |
| kN | [6 200,12 000] | /(t·m-3) | [1.3,1.5] |
| kN | [6 200,12 000] | /(t·m-3) | [1.3,1.5] |
| kN | [13 600,239 000] | /(m3·h-1) | [2 140,3 030] |
| kN | [12 000,15 200] | x17×105 Pa | [3.3,3.4] |
), ArticleFig(id=1167811961451459031, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=EN, label=Table 5, caption=
Adjustment parameters of each scenario
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| 场景 | 调整参数 |
| 场景1 | |
| 场景2 | |
| 场景3 | |
), ArticleFig(id=1167811961568899544, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=CN, label=表5, caption=
各场景的调整参数
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| 场景 | 调整参数 |
| 场景1 | |
| 场景2 | |
| 场景3 | |
), ArticleFig(id=1167811961690534361, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=EN, label=Table 6, caption=
Shield posture before and after optimization
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| 盾构姿态指标 | 初始值 | 优化值 | 优化占比/% |
| /mm | -39.42 | -23.36 | 40.75 |
| /mm | 37.07 | 21.81 | 41.17 |
| /mm | -51.97 | -34.17 | 34.26 |
| /mm | 44.67 | 28.95 | 35.19 |
| /(mm·m-1) | -26.79 | -18.63 | 30.48 |
| /(mm·m-1) | 3.93 | 3.60 | 8.39 |
), ArticleFig(id=1167811961833140698, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=CN, label=表6, caption=
优化前后的盾构姿态
, figureFileSmall=null, figureFileBig=null, tableContent=
| 盾构姿态指标 | 初始值 | 优化值 | 优化占比/% |
| /mm | -39.42 | -23.36 | 40.75 |
| /mm | 37.07 | 21.81 | 41.17 |
| /mm | -51.97 | -34.17 | 34.26 |
| /mm | 44.67 | 28.95 | 35.19 |
| /(mm·m-1) | -26.79 | -18.63 | 30.48 |
| /(mm·m-1) | 3.93 | 3.60 | 8.39 |
), ArticleFig(id=1167811962017690075, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=EN, label=Table 7, caption=
Optimization results of different scenarios
, figureFileSmall=null, figureFileBig=null, tableContent=
| 场景 | /mm | /mm | /mm | /mm | /(mm·m-1) | /(mm·m-1) | 平均优化率/% |
| 场景1 | 优化后数值 | -23.356 | 21.811 | -34.166 | 28.951 | -18.627 | 3.604 | 36.35 |
| 改进占比/% | 40.75 | 41.17 | 34.26 | 35.19 | 30.48 | 8.39 |
| 场景2 | 优化后数值 | -22.205 | 21.705 | -33.423 | 28.905 | -18.583 | 3.538 | 37.41 |
| 改进占比/% | 43.67 | 41.45 | 35.69 | 35.30 | 30.64 | 10.07 |
| 场景3 | 优化后数值 | -21.662 | 21.354 | -32.148 | 28.572 | -18.367 | 3.391 | 38.86 |
| 改进占比/% | 45.05 | 42.40 | 38.14 | 36.04 | 31.45 | 13.80 |
| 平均值/% | 43.16 | 41.67 | 36.03 | 35.51 | 30.86 | 10.75 | 37.54 |
), ArticleFig(id=1167811962290319836, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149735934079451142, language=CN, label=表7, caption=
不同场景优化结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 场景 | /mm | /mm | /mm | /mm | /(mm·m-1) | /(mm·m-1) | 平均优化率/% |
| 场景1 | 优化后数值 | -23.356 | 21.811 | -34.166 | 28.951 | -18.627 | 3.604 | 36.35 |
| 改进占比/% | 40.75 | 41.17 | 34.26 | 35.19 | 30.48 | 8.39 |
| 场景2 | 优化后数值 | -22.205 | 21.705 | -33.423 | 28.905 | -18.583 | 3.538 | 37.41 |
| 改进占比/% | 43.67 | 41.45 | 35.69 | 35.30 | 30.64 | 10.07 |
| 场景3 | 优化后数值 | -21.662 | 21.354 | -32.148 | 28.572 | -18.367 | 3.391 | 38.86 |
| 改进占比/% | 45.05 | 42.40 | 38.14 | 36.04 | 31.45 | 13.80 |
| 平均值/% | 43.16 | 41.67 | 36.03 | 35.51 | 30.86 | 10.75 | 37.54 |
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