Article(id=1149741822999703981, tenantId=1146029695717560320, journalId=1146031787341344770, issueId=1149741815273800564, articleNumber=1003-3033(2024)01-0193-07, orderNo=null, doi=10.16265/j.cnki.issn1003-3033.2024.01.1243, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1691769600000, receivedDateStr=2023-08-12, revisedDate=1699977600000, revisedDateStr=2023-11-15, acceptedDate=null, acceptedDateStr=null, onlineDate=1752049411773, onlineDateStr=2025-07-09, pubDate=1706371200000, pubDateStr=2024-01-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1752049411773, onlineIssueDateStr=2025-07-09, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1752049411773, creator=13701087609, updateTime=1752049411773, updator=13701087609, issue=Issue{id=1149741815273800564, tenantId=1146029695717560320, journalId=1146031787341344770, year='2024', volume='34', issue='1', 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=1752049409931, creator=13701087609, updateTime=1756468937446, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1168278657316430156, tenantId=1146029695717560320, journalId=1146031787341344770, issueId=1149741815273800564, language=EN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1168278657316430157, tenantId=1146029695717560320, journalId=1146031787341344770, issueId=1149741815273800564, language=CN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=193, endPage=199, ext={EN=ArticleExt(id=1149741823201030575, articleId=1149741822999703981, tenantId=1146029695717560320, journalId=1146031787341344770, language=EN, title=Heterogeneous vehicle routing problem of hazardous materials transportation considering carbon emissions, columnId=1149733269173878863, journalTitle=China Safety Science Journal, columnName=Safety engineering technology, runingTitle=null, highlight=null, articleAbstract=

To fill the research gap,a HVRP for hazardous materials transportation was proposed in this study,aiming at optimizing the three objectives as total risk,total cost and total carbon emissions. Firstly,in the model construction stage,the measurement methods of total cost and total risk were improved,including establishing a loading-dependent risk quantification method for explosion scenarios,and designing a specific soft time window for penalty cost calculation,which could preferentially reduce the waiting time of vehicles with large loads at customers. Then,to better solve the above model,the NSGA-II was improved in two aspects. A hybrid crossover method with new crossover operators was designed to improve the global search efficiency,and a two-stage variable neighborhood search (VNS) algorithm was adopted to improve the local search ability. Finally,a numerical example was given to verify the effectiveness of the model and algorithm. The results indicate that,compared with the original NSGA-II,the convergence curve of the improved algorithm decreases faster,and the average values of the three optimization objectives of total cost,total risk and total carbon emissions are further reduced by 3.36%,12.16% and 6.96% respectively. In a fleet with limited number of vehicles,the carrier can have different degrees of influence on each target by choosing different vehicle types.

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为满足危险品运输异构车辆路径问题(HVRP)的低碳需求,对易爆危险品运输过程中的总风险、总成本和总碳排放量进行最优化处理。首先,在模型构造阶段,改进总成本与总风险的度量方式,包括建立爆炸事故场景下考虑危险品装载量的风险量化模型,并设计一种用于惩罚成本计算的软时间窗函数,该函数可以优先减少装载量较大的车辆在客户处的等待时间;然后,在算法改良阶段从2方面改进非支配排序遗传算法(NSGA-Ⅱ),设计一种带有改良交叉算子的混合交叉方法来提升全局搜索效率,并通过包含2个阶段的变邻域搜索(VNS)算法来提高局部搜索能力;最后,通过算例验证模型和算法的有效性。研究结果表明:相较于原始NSGA-Ⅱ,改进的算法收敛曲线下降更快,使总成本、总风险和总碳排放量3个优化目标的平均值进一步减少3.36%、12.16%和6.96%;在车辆数目有限的车队中,承运人可以通过选择不同的车辆类型对各目标产生不同程度的影响。

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马天明 (1995—),男,黑龙江哈尔滨人,博士研究生,研究方向为危险品运输风险评价与危险品车辆路径优化。E-mail:

陈先锋,教授

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陈先锋,教授

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Research on multi-objective flexible job shop scheduling problem in large garment enterprises[D]. Hangzhou: Zhejiang University of Science and Technology, 2022., articleTitle=null, refAbstract=null)], funds=[Fund(id=1168122828160250497, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, awardId=52274224, language=CN, fundingSource=国家自然科学基金资助(52274224), fundOrder=null, country=null), Fund(id=1168122828286079619, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, awardId=黔科合支撑[2023]一般186, language=CN, fundingSource=贵州省科技计划项目(黔科合支撑[2023]一般186), fundOrder=null, country=null), Fund(id=1168122828353188484, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, awardId=2023AFA013, language=CN, fundingSource=湖北省自然科学基金资助(2023AFA013), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1168122825081631286, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, xref=null, ext=[AuthorCompanyExt(id=1168122825085825591, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, companyId=1168122825081631286, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan Hubei 430070,China), AuthorCompanyExt(id=1168122825090019896, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, companyId=1168122825081631286, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=武汉理工大学 安全科学与应急管理学院,湖北 武汉 430070)])], figs=[ArticleFig(id=1168122826797101669, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=EN, label=Fig.1, caption=Load-dependent impact area, figureFileSmall=GH/uIP3RO5ZAoSQZ+MGZYQ==, figureFileBig=1qjcolZwx83mgo8LQ5fROQ==, tableContent=null), ArticleFig(id=1168122826868404838, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=CN, label=图1, caption=装载量依赖的冲击区域, figureFileSmall=GH/uIP3RO5ZAoSQZ+MGZYQ==, figureFileBig=1qjcolZwx83mgo8LQ5fROQ==, tableContent=null), ArticleFig(id=1168122826922930792, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=EN, label=Fig.2, caption=Random route preservative crossover (RRPX), figureFileSmall=/gvlZYTHQ4jo4XHn3pZuJQ==, figureFileBig=fJPhvqE+KTnIlaTs+RByiQ==, tableContent=null), ArticleFig(id=1168122826981651049, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=CN, label=图2, caption=随机路线保留交叉算子(RRPX), figureFileSmall=/gvlZYTHQ4jo4XHn3pZuJQ==, figureFileBig=fJPhvqE+KTnIlaTs+RByiQ==, tableContent=null), ArticleFig(id=1168122827031982698, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=EN, label=Fig.3, caption=Three route-based neighborhood operators, figureFileSmall=0q6iDv0u2+SrwPCITmgr8g==, figureFileBig=wFAMqejwzPG9Ds3nyhOggg==, tableContent=null), ArticleFig(id=1168122827086508652, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=CN, label=图3, caption=3种基于路线的邻域算子, figureFileSmall=0q6iDv0u2+SrwPCITmgr8g==, figureFileBig=wFAMqejwzPG9Ds3nyhOggg==, tableContent=null), ArticleFig(id=1168122827145228909, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=EN, label=Fig.4, caption=Variation trend of minimum value of each objective in different algorithm, figureFileSmall=OfJ2WmW/LpFp2W0HwTJ0YQ==, figureFileBig=ZaypzfnhYgwUH7vUkr8vZg==, tableContent=null), ArticleFig(id=1168122827224920686, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=CN, label=图4, caption=不同算法的各优化目标最小值变化趋势, figureFileSmall=OfJ2WmW/LpFp2W0HwTJ0YQ==, figureFileBig=ZaypzfnhYgwUH7vUkr8vZg==, tableContent=null), ArticleFig(id=1168122827287835246, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=EN, label=Fig.5, caption=Two-dimensional distribution of Pareto frontier, figureFileSmall=0mJo7xhqRwpqKIttP5DsGw==, figureFileBig=ZF3hk/Y1j9GPlz6osSd61w==, tableContent=null), ArticleFig(id=1168122827367527025, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=CN, label=图5, caption=Pareto前沿的二维分布, figureFileSmall=0mJo7xhqRwpqKIttP5DsGw==, figureFileBig=ZF3hk/Y1j9GPlz6osSd61w==, tableContent=null), ArticleFig(id=1168122827459801713, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=EN, label=Tab.1, caption=

Characteristic parameters of various vehicles

, figureFileSmall=null, figureFileBig=null, tableContent=
特征 类型A 类型B 类型C
额定装载量/t 30 20 15
可用车辆数 6 6 8
每辆固定成本/元 600 500 400
空车质量/t 16 12 8
), ArticleFig(id=1168122827543687795, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=CN, label=表1, caption=

各类车辆特征参数

, figureFileSmall=null, figureFileBig=null, tableContent=
特征 类型A 类型B 类型C
额定装载量/t 30 20 15
可用车辆数 6 6 8
每辆固定成本/元 600 500 400
空车质量/t 16 12 8
), ArticleFig(id=1168122827627573877, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=EN, label=Tab.2, caption=

Percentage reduction of improved NSGA-Ⅱ on each objective%

, figureFileSmall=null, figureFileBig=null, tableContent=
统计项目 总成本 总风险 总碳排放量
平均值减少 3.36 12.16 6.96
最小值减少 6.89 10.17 6.40
), ArticleFig(id=1168122827728237175, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=CN, label=表2, caption=

改进的NSGA-Ⅱ在各目标值上的减少占比

, figureFileSmall=null, figureFileBig=null, tableContent=
统计项目 总成本 总风险 总碳排放量
平均值减少 3.36 12.16 6.96
最小值减少 6.89 10.17 6.40
), ArticleFig(id=1168122827858260601, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=EN, label=Tab.3, caption=

Information of solution corresponding to each minimum objective value

, figureFileSmall=null, figureFileBig=null, tableContent=
统计信息 解1 解2 解3
总风险 8 069 15 039 12 259
总成本/元 166 191 97 891 116 164
总碳排放量/kg 182 159 146
使用车辆数(A车型/
B车型/C车型)
6/4/3 6/6/8 5/4/8
总距离/km 1 184 1 262 1 103
总等待时间/min 0.75 69.63 53.69
总延误时间/min 1.83 49.87 37.67
), ArticleFig(id=1168122827933758075, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=CN, label=表3, caption=

各最小目标值对应解的信息

, figureFileSmall=null, figureFileBig=null, tableContent=
统计信息 解1 解2 解3
总风险 8 069 15 039 12 259
总成本/元 166 191 97 891 116 164
总碳排放量/kg 182 159 146
使用车辆数(A车型/
B车型/C车型)
6/4/3 6/6/8 5/4/8
总距离/km 1 184 1 262 1 103
总等待时间/min 0.75 69.63 53.69
总延误时间/min 1.83 49.87 37.67
), ArticleFig(id=1168122828005061245, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=EN, label=Tab.4, caption=

Spearman's coefficients between the number of different types of vehicle and each objective

, figureFileSmall=null, figureFileBig=null, tableContent=
目标 类型A 类型B 类型C
总成本/元 -0.21 0.58 0.77
总风险 0.15 -0.55 -0.74
总碳排放量/kg 0.38 -0.08 -0.60
), ArticleFig(id=1168122828051198591, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149741822999703981, language=CN, label=表4, caption=

不同类型车辆使用数与各目标之间的斯皮尔曼系数

, figureFileSmall=null, figureFileBig=null, tableContent=
目标 类型A 类型B 类型C
总成本/元 -0.21 0.58 0.77
总风险 0.15 -0.55 -0.74
总碳排放量/kg 0.38 -0.08 -0.60
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考虑碳排放的危险品运输异构车辆路径问题研究
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马天明 , 黄楚原 , 陈先锋
中国安全科学学报 | 安全工程技术 2024,34(1): 193-199
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中国安全科学学报 | 安全工程技术 2024, 34(1): 193-199
考虑碳排放的危险品运输异构车辆路径问题研究
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马天明 , 黄楚原, 陈先锋
作者信息
  • 武汉理工大学 安全科学与应急管理学院,湖北 武汉 430070
  • 马天明 (1995—),男,黑龙江哈尔滨人,博士研究生,研究方向为危险品运输风险评价与危险品车辆路径优化。E-mail:

    陈先锋,教授

Heterogeneous vehicle routing problem of hazardous materials transportation considering carbon emissions
Tianming MA , Chuyuan HUANG, Xianfeng CHEN
Affiliations
  • School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan Hubei 430070,China
出版时间: 2024-01-28 doi: 10.16265/j.cnki.issn1003-3033.2024.01.1243
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为满足危险品运输异构车辆路径问题(HVRP)的低碳需求,对易爆危险品运输过程中的总风险、总成本和总碳排放量进行最优化处理。首先,在模型构造阶段,改进总成本与总风险的度量方式,包括建立爆炸事故场景下考虑危险品装载量的风险量化模型,并设计一种用于惩罚成本计算的软时间窗函数,该函数可以优先减少装载量较大的车辆在客户处的等待时间;然后,在算法改良阶段从2方面改进非支配排序遗传算法(NSGA-Ⅱ),设计一种带有改良交叉算子的混合交叉方法来提升全局搜索效率,并通过包含2个阶段的变邻域搜索(VNS)算法来提高局部搜索能力;最后,通过算例验证模型和算法的有效性。研究结果表明:相较于原始NSGA-Ⅱ,改进的算法收敛曲线下降更快,使总成本、总风险和总碳排放量3个优化目标的平均值进一步减少3.36%、12.16%和6.96%;在车辆数目有限的车队中,承运人可以通过选择不同的车辆类型对各目标产生不同程度的影响。

碳排放  /  危险品  /  异构车辆路径问题(HVRP)  /  多目标优化  /  非支配排序遗传算法(NSGA-Ⅱ)

To fill the research gap,a HVRP for hazardous materials transportation was proposed in this study,aiming at optimizing the three objectives as total risk,total cost and total carbon emissions. Firstly,in the model construction stage,the measurement methods of total cost and total risk were improved,including establishing a loading-dependent risk quantification method for explosion scenarios,and designing a specific soft time window for penalty cost calculation,which could preferentially reduce the waiting time of vehicles with large loads at customers. Then,to better solve the above model,the NSGA-II was improved in two aspects. A hybrid crossover method with new crossover operators was designed to improve the global search efficiency,and a two-stage variable neighborhood search (VNS) algorithm was adopted to improve the local search ability. Finally,a numerical example was given to verify the effectiveness of the model and algorithm. The results indicate that,compared with the original NSGA-II,the convergence curve of the improved algorithm decreases faster,and the average values of the three optimization objectives of total cost,total risk and total carbon emissions are further reduced by 3.36%,12.16% and 6.96% respectively. In a fleet with limited number of vehicles,the carrier can have different degrees of influence on each target by choosing different vehicle types.

carbon emission  /  hazardous materials  /  heterogeneous vehicle routing problem (HVRP)  /  multi-objective optimization  /  non-dominant sorting genetic algorithm II (NSGA-II)
马天明, 黄楚原, 陈先锋. 考虑碳排放的危险品运输异构车辆路径问题研究. 中国安全科学学报, 2024 , 34 (1) : 193 -199 . DOI: 10.16265/j.cnki.issn1003-3033.2024.01.1243
Tianming MA, Chuyuan HUANG, Xianfeng CHEN. Heterogeneous vehicle routing problem of hazardous materials transportation considering carbon emissions[J]. China Safety Science Journal, 2024 , 34 (1) : 193 -199 . DOI: 10.16265/j.cnki.issn1003-3033.2024.01.1243
危险品通常具有燃爆性、腐蚀性或毒性等危险特性,而我国大多数危险品需要通过道路运输,发生事故后极有可能造成人员伤亡、财产损失或环境污染等危害[1]。2021年,交通运输部发布了一系列改善交通运输服务业碳排放的政策,重点关注碳达峰和碳中和的总体目标。绿色车辆路径问题在普通商品的物流研究中取得一些进展,但在危险品运输领域的研究很少。此外,考虑到现实中许多危险品物流公司的车队包含多种类型车辆,因此,研究同时优化风险、成本和碳排放3种目标的绿色异构车辆路径问题(Heterogeneous Vehicle Routing Problem,HVRP),对危险品运输业的安全保障、成本控制和节能减排具有重要意义。
HVRP最早由TAILLARD[2]提出,异构表现为承运车队由多种具有不同特征如额定载重量、启用成本等的车辆组成。BULA等[3-4]首次将HVRP引入到危险品运输领域,随后建立了包含风险和成本的双目标优化模型,并提出一种ε约束的局部搜索算法。与BULA等假设各类车辆数目无限不同,滕玥等[5]研究了危险品运输中的异构固定车队车辆路径问题,并提出ε约束的禁忌搜索算法来求解运输风险与成本的双目标模型。JIANG Peng等[6]所建立的多目标优化模型在风险与成本的基础上加入了平均冗余度,但其所使用的惩罚函数是一种单边硬时间窗,没有考虑车辆迟到带来的延误成本。上述成果虽探究了异构车队对危险品运输的影响,但依然没有解决风险与成本度量上的有关问题:①部分研究没有量化装载量变化对危险品运输风险的影响,而考虑装载量变化的研究通常将装载量与事故后果之间的关系简化成线性或指数关系[47],无法体现具体事故场景的危害特点;②没有考虑危险品车辆由于长时间停放可能会对客户带来的潜在安全隐患,所建立的惩罚成本时间窗函数无法体现危险品装载量对客户安全的影响。
综上,笔者拟构建带有时间窗的绿色异构固定车队车辆路径问题的多目标优化模型:假设事故场景为易爆危险品泄漏后爆炸,提出一种基于爆炸超压的装载量依赖风险量化方法;设计新的双边软时间窗类型惩罚函数,使装载量较大的危险品车辆优先减少在客户处的等待时间;应用综合碳排放模型量化运输路径上的总碳排放量。在求解算法方面,改进车辆路径多目标优化问题中广泛使用的非支配排序遗传算法(Non-dominated Sorting Genetic Algorithm II,NSGA-Ⅱ),包括设计新的交叉方式以及在局部搜索过程中增加2个阶段的变邻域搜索(Variable Neighborhood Search,VNS)算法,以期提高算法的全局搜索效率,并加快算法的收敛速度,改善最终优化结果质量。
考虑装载量变化的情况下,人口暴露模型的冲击区域边界会随载重量变化发生改变。对于易爆危险品,研究表明:蒸气云爆炸(Vapor Cloud Explosion,VCE)通常比沸腾液体膨胀蒸气爆炸(Boiling Liquid Expanding Vapor Explosion,BLEVE)对周围目标造成更大范围的影响[8]。因此,假设易爆危险品泄漏引起事故场景为VCE。基于三硝基甲苯当量的VCE冲击波超压估计方法已得到广泛应用[9]。文献[10]给出的冲击波超压与人员伤亡程度之间的关系,为保证人员不受任何影响,选取19.6 kPa作为超压临界值,得到的等效比例距离,记为Z
r = Z W 1 / 3
式中:r为危险品爆炸造成的最大冲击半径,m;W为蒸气云中燃料质量,kg。下式给出某一路段上的装载量依赖风险 R i j l k的计算方法, r i j l k表示类型l的车辆k在客户i到客户j之间路段 ( i j )上产生的最大冲击半径,dijuij分别表示路段的长度,m和两侧人口密度,人/km2。不同路段的冲击区域随 r i j l k改变而变化,如图1所示。在客户1和客户2组成的路段(1,2)上的最大冲击半径 r 12 l k与路段(2,3)上的 r 23 l k不同。
R i j l k = ( 2 r i j l k d i j + π r i j l k 2 ) u i j
所构建的惩罚函数为双边软时间窗类型,每个客户的时间窗由四元数组 [ t i a t i b t i c t i d ]表示,其中, t i a t i d表示客户i可接受车辆的最早和最晚到达时间; t i b t i c表示客户i接受车辆开始服务的最早和最晚时间。下式为类型l的车辆k在客户i处的惩罚成本 C p i l k(元)计算公式:
C p i l k = a i l k < t i a ( p m a x - p m i n ) q - i l k / Q m + p m i n ( t i b - a i l k ) t i a a i l k < t i b 0 t i b a i l k t i c p ¯ ( a i l k - t i c ) t i c < a i l k t i d a i l k > t i d
式中: q - j l k a i l k分别为类型l的车辆k在客户i处的装载量(t)和到达时间(min);Qm为所有车辆类型中的最大额定载重量,t。车辆被禁止在 [ t i a t i d ]以外的时间到达客户i处。当车辆在区间 [ t i b t i c ]内到达,不会受到任何惩罚。当车辆在 t i a t i b(早到)或 [ t i c t i d ](晚到)到达时,都会产生一个随等待或延误时间线性增加的惩罚成本。晚到的单位惩罚成本为一个定值 p -,元;为尽量减少危险品装载量较大的车辆在客户处的等待时间,早到的单位惩罚成本在一个区间内随装载量的增加线性递增; p m i n p m a x分别为早到单位惩罚成本的下限和上限。
BARTH等[11]开发的综合排放模型可将车辆的速度、行驶距离和总重量等详细参数整合在一起,其耗油量的计算结果更加真实:
F i j l k = λ k N V + M l + q - j l k γ h i j l k v i j l k + β γ v i j l k 3 d i j / v i j l k
式中: F i j l k h i j l k v i j l k分别为类型l的车辆k在路段 ( i j )上的耗油量(kg)、加速度(m/s2)和速度(m/s)。为简化计算,假设所有车辆在所有道路上均以40 km/h 匀速行驶,加速度为0。可变参数有: M l为类型l的车辆的自重,t; q - j l k为类型l的车辆k到达客户j之前的装载量,即:在路段 ( i j )上的装载量,t;dij为路段 ( i j )的长度,km。最终,由下式可得到类型l的车辆k在路段 ( i j )上的碳排放量 E i j l k kg,其中,ε为碳排放系数。
E i j l k = ε F i j l k
建立的模型定义在一个完全图上 G = ( V A ) V = { 0 } N由表示仓库的节点0和一组客户节点 N = { 1,2 n }组成。 A = { ( i j ) : i j V i j }是弧(路段)的集合。每个路段都有相应的长度和周围的人口密度。 L = { 1,2 l }表示所有车辆类型的集合,每类车辆都有相应的固定成本 C f l、单位距离的可变成本 C v l、额定装载量 Q l和空车质量 M l K = { 1,2 k l }表示类型l的所有车辆集合,其中, k l为该类型的车辆总数。当类型l的车辆k从节点i到节点j时, x i j l k为1;否则为0。当客户i接受类型l的车辆k服务, y i l k为1;否则为0。完整的数学形式如下:
m i n Z 1 = l L k K l ( i j ) A C v l d i j x i j l k + l L k K l j N C f l x 0 j l k + l L k K l i N C p i l k y i l k
m i n Z 2 = l L k K l ( i j ) A R i j l k x i j l k
m i n Z 3 = l L k K l ( i j ) A E i j l k x i j l k
式(6)—(8)表明建立的模型用于解决多目标优化问题,对所有类型车辆在危险品运输过程中的总成本、总风险和总碳排放量进行优化。其中,式(6)中的总成本由行程成本、启用车辆的固定成本和惩罚成本组成。
j N x 0 j l k = i N x i 0 l k = 1   l L k K l
p V x p j l k - p V x i p l k = 0 i j V l L k K l
l L k K l y i l k = 1   i N
p V x p j l k = p V x i p l k = y i l k   i N l L k K l
式(9)约束启用的车辆从车场出发必须返回车场;式(10)是流量约束;式(11)约束每个顾客只能由一辆车服务;式(12)约束车辆在服务一个客户后必须从该客户处离开。
i N y i l k q i Q l   l L k K l
式(13)要求任何车辆所服务的客户的总需求不能超过该车型的额定载重量,qi为客户i的需求量。
y i l k ( t i a - a i l k ) ( t i d - a i l k ) 0 i N l L k K l
$\begin{array}{c} a_{j}^{l k}=\left[a_{i}^{l k}+\max \left(t_{\mathrm{c}}^{i}-a_{i}^{l k},0\right)+S T_{i}\right] y_{i}^{l k}+t_{i j} x_{i j}^{l k} \\ \forall i,j \in N,l \in L,k \in K_{l} \end{array}$
$\begin{array}{c} {\left[a_{i}^{l k}+\max \left(t_{\mathrm{c}}^{i}-a_{i}^{l k},0\right)+S T_{i}\right] y_{i}^{l k}+t_{i 0} x_{i 0}^{l k} \leqslant T} \\ \forall i \in N,l \in L,k \in K_{l} \end{array}$
式(14)表示车辆必须在顾客所能容忍的时间区间内到达, a j l k为类型l的车辆k到达客户j的时间;式(15)表示到达时间约束,tij为车辆在路段 ( i j )上的行驶时长,min;STi为车辆在客户i处的服务时长,min。式(16)约束车辆必须在车场关闭前返回,T为仓库的关闭时间。
k K l j N x 0 j l k k l   l L
式(17)约束每种类型启用的车辆数量不能超过该类型的车辆总数。
NSGA-II作为一种多目标优化的元启发式算法,虽然在全局搜索上具有较好性能,但存在运行速度慢、后期难以快速有效收敛到真实Pareto边界附近的问题。为解决上述问题,对NSGA-II进行2方面改进:在全局搜索过程中,设计新的交叉算子随机路径保留交叉,与最大保留交叉一起构成混合交叉方法;在局部搜索过程中,对单点交换变异操作后生成的子代执行2阶段的VNS操作。
采用常见的无分隔符自然数编码策略,即使用1~n的自然数序列表示车辆在其行驶路径上依次经过的客户。文中采用一种满载率优先的解码策略来最大程度地减少HVRP中的车辆使用数量,在其启发下构建可以表示不可行解的解码算法,具体过程可被概括为2个阶段。
1) 路径生成阶段。假设当前路径由可用车型列表中额定载重量最大的车型服务,依次检查染色体中剩余客户是否满足载重量、时间窗和返回时间约束,若满足则将其加入当前路径;若不满足则结束当前路径生成,进入车辆分配阶段,待车辆分配阶段结束后创建不含任何用户的新路径,并再次进入该阶段。
2) 车辆分配阶段。选择当前可用车型列表中额定载重量刚好满足生成路径上所有客户需求总量的车型,并使该车型的车辆数减1,当车辆数为0时从可用车型列表中删除该车型。检查可用车型列表是否为空,若是,则向其中添加额定载重量最小的车型,并假设该车型可用车辆数为无限。
当染色体中没有剩余客户时,上述解码过程终止。需要说明的是,在车辆分配阶段加入可用车型检查操作,即当所有类型车辆都已被使用后通过添加无限个额定载重量最小的车型来解决没有车辆可分配的情况(即不可行解)。
传统交叉算子通常是基于随机选择的连续基因片段进行操作的,如顺序交叉、部分匹配交叉和最大保留交叉等[12]。这种不依赖具体问题的随机性较强的交叉算子可以充分保证子代的多样性,但同时增加了全局搜索的盲目性。为解决上述问题,在最大保留交叉算子(Maximal Preservative Crossover,MPX)的基础上设计一种新的交叉算子,并将其命名为随机路径保留交叉(Random Route Preservative Crossover,RRPX)。
所提出的RRPX的操作过程如图2所示。与MPX有2点不同:①要保留的基因片段不是直接从父代染色体中随机截取得到,而是在父代染色体解码后形成的所有路径中随机选择一个代表某条路径的基因片段;②被保留的基因片段的放置位置被固定在子代染色体头部,而不是随机选取。RRPX的目的是尽可能保留路径中潜在的优良子路径,如果将代表某一路径的基因片段放在子代染色体中间,则根据2.1节的解码方法,该路径上的部分客户可能被分离出来加入前面的路径中。在迭代过程中若本轮交叉操作使用MPX,则下一轮使用RRPX,然后再次使用MPX,交替循环。这种混合交叉方法可以充分发挥2种交叉算子的优势:首先利用MPX的随机性快速扩大搜索范围,然后利用RRPX的指向性来保护潜在的优良子路径,从而更高效的对解空间进行全局搜索。
为防止算法过早收敛,陷入局部最优,选择对变异操作后的个体进一步使用VNS来改善局部搜索效率。Insert、Swap和Inverse算子是常见的邻域算子[13],但这些算子都是以基因为单位插入、交换和反转操作染色体,具有较大的不确定性。因此,提出基于路线的Insert、Swap和Inverse算子,如图3所示。与2.2节提出的RRPX算子类似,每个算子的操作对象都是染色体被解码后形成的代表路线的基因片段。部分路线在基于路线的邻域算子的操作下会被保留下来,也可能会被拆散或者被延长。VNS过程包含2个阶段:变异操作后生成的子代在经过使用3个基于基因的邻域算子的VNS后(阶段1)再经过使用3个基于路线的邻域算子的VNS(阶段2),最终得到2阶段VNS后的子代。阶段1、2中的VNS索次数为M1M2
Solomon数据集是目前被广泛应用于VRPTW的标准数据集。考虑到实际危险品运输场景,化工企业的位置分布不一定呈现明显的集群特征,且允许车辆进行装卸作业的时间跨度较长,选择从客户位置分布随机、时间窗较宽(30个单位)的R105算例中随机挑选50个客户作为原始算例,进行以下调整得到所需算例:在原始算例中每个客户的 t i b t i c的基础上随机减去或加上10~30之间的任意数字得到 t i a t i d;将原始算例中客户的需求量调整至 3~12t。 与惩罚成本相关的式(6)中参数设置为: p m i n = 30 p m a x = 50 p ' = 50。为简化计算,假设式(6) 中每种车辆行驶单位距离的危险品为液化石油气(Liquefied Petroleum Gas,LPG),爆炸热为46 000 kJ/kg。 最后,以某危险品物流公司的LPG运输车队为例,假设有A、B、C等3种车型,每种车型与本研究优化目标值计算有关的参数见表1
参考NSGA-Ⅱ的常见参数设置,将交叉概率和变异概率分别设置为0.9和0.1,种群规模设置为60。为使算法结果具备一定的稳定性,将对比试验中所有算法的迭代次数设置为1 000轮,并重复20次。通过多次运算结果对比发现,2阶段VNS的最佳搜索次数M1M2分别被设置为3和5时,改进的NSGA-Ⅱ算法可以得到质量最好的解集。为验证第2节中提出的所有改进措施效果,图4为原始NSGA-Ⅱ、使用混合交叉的NSGA-Ⅱ、使用混合交叉和一阶段VNS的NSGA-Ⅱ以及使用混合交叉和2阶段VNS的NSGA-Ⅱ这4种算法的3个优化目标每轮最小值在20次试验中的平均值变化趋势。可以看到,相对原始NSGA-Ⅱ,其他3种算法的曲线下降速度更快且停止在更低,位置。表2为改进NSGA-Ⅱ最终得到的解集相对于原始NSGA-Ⅱ在 3个目标上的平均值和最小值减少的占比。
分析改进的NSGA-Ⅱ在20次重复试验中得到的结果。表3为在总成本、总风险和总碳排放量上分别取得最小值时对应的解1,解2和解3的信息。
通过对比看到,解1使用的车辆数是3个解中最少的;解2和解3有较长的总等待时间和总延误时间;解3的行驶总距离是3个解中最短的。
针对本文所研究的多目标优化问题,为探索不同目标之间潜在关系,将解集中所有非支配解形成的Pareto前沿映射到3个二维平面,如图5所示。从图5中可以看出,减少总成本将导致总风险与总碳排放量的增加,减少总碳排放量的同时也将减少总风险。相较于皮尔逊系数,斯皮尔曼系数能够用于非正态数据的关联强度分析,本文经计算得出总风险与总成本之间、总碳排放量与总成本之间、总风险与总碳排放量之间的斯皮尔曼系数Sp分别为-0.9,-0.58和0.53,且p值<0.01。因此,可以验证:总成本与总风险之间存在较强的负相关关系,和总碳排放量之间存在中等负相关关系;总碳排放量和总风险之间存在中等正相关关系。
表3中不同解的车辆使用情况差距较大,因此我们猜测不同类型的车辆使用数量可能与各目标之间也存在影响关系。表4为不同类型车辆使用数与各目标之间的斯皮尔曼系数。其中,所有结果p值均<0.01。从表4可以得出结论:使用车型B和车型C会较大程度增加总成本,但可以减少总风险;车型B对总碳排放量的影响较小,为减少总碳排放量,应更多的使用车型C,尽量避免使用车型A。
1) 考虑易爆危险品在爆炸事故场景下影响范围的风险模型更加真实、准确;考虑危险品装载量的软时间窗惩罚函数不仅能最小化延误时间,还可以优先减少装载量较大的车辆的等待时间。
2) 对于NSGA-Ⅱ,提出新的交叉算子随机路线保留交叉,并用混合交叉方式替代原有交叉操作;在变异操作阶段后添加包含2个阶段的变邻域搜索过程。经验证上述改进措施能够提高算法收敛速度,且在各目标上取得更好优化结果。
3) 算例测试结果表明:总成本分别与总风险、总碳排放量之间存在较强的和中等的负相关系;总碳排放量与总风险之间存在中等的正相关关系;不同车辆类型的使用数量会对3个优化目标产生不同程度的影响。
  • 国家自然科学基金资助(52274224)
  • 贵州省科技计划项目(黔科合支撑[2023]一般186)
  • 湖北省自然科学基金资助(2023AFA013)
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2024年第34卷第1期
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doi: 10.16265/j.cnki.issn1003-3033.2024.01.1243
  • 接收时间:2023-08-12
  • 首发时间:2025-07-09
  • 出版时间:2024-01-28
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  • 收稿日期:2023-08-12
  • 修回日期:2023-11-15
基金
国家自然科学基金资助(52274224)
贵州省科技计划项目(黔科合支撑[2023]一般186)
湖北省自然科学基金资助(2023AFA013)
作者信息
    武汉理工大学 安全科学与应急管理学院,湖北 武汉 430070
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