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ID:16169955
大小:1.47 MB
页数:65页
时间:2018-08-08
《基于聚类分析和遗传算法的带时间窗车辆路径问题研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、福建农林大学硕士学位论文基于聚类分析和遗传算法的带时间窗车辆路径问题研究姓名:林郁丞申请学位级别:硕士专业:交通运输规划与管理指导教师:张正雄20090401基于聚类分析和遗传算法的带时间窗车辆路径问题研究RearchontheVehicleRoutingProblemwithTimeWindowsBasedonClusterAnalysisandGeneticAlgorithmAbstract:VehicleRoutingProblem(VRP)isoneofthekeyprocessesoflogisticsdistribution.Ascompetitio
2、nsamonglogisticsdistributionindustryaregettingmoreandfiercerandcustomers’requirementsforatime・effectivelogisticsdistributionarebecomingmoreandmoreintense,studiesonVRP,especiallyVehicleRoutingProblemwithTimewindows(VRPTW),arepracticallysignificantoneveryaspectoflogisticsdistributionin
3、dustry.Transportationcompaniescanimprovetheirservicesbyprovidingtheircustomers埘thfast,punctual,safeandcomfortableservices,theirtransportationcostscanbecutdownbyimprovingvehiclesutilization.Besides,fastspeed,asa”bottleneck”tothedevelopmentofe-commerce,islargelysolved.Productioncyclesa
4、reshortenedandcapitalturnoverisaccelerated,therefore,rationalallocationsofresourcescanberealizedandfortunesfrom”thethirdprofitsource”canaswellbemade.UnderaseriousanalysisontheresearchedstatusofVRPbothinChinaandabroad,VRPTWWasparticularlyanalyzedindepth.Consideringtheimpactsfromroadsc
5、ongestiononthedistribution.mathematicalmodelsonVRPTWwerebuiltwiththeintroductionofroadresistancecoefficient.Two・phaseheuristicalgorithmwasappliedtOsolvethemodelsaccordingtothecharacteristicsoflarge-scaleVRP.Firstly,large-scaleVl冲Wassimplifiedintosmall・scaleVfuPbyusingk-meansclusteran
6、alysistodividethedistributionnetworkinordertoreducecomputationwhileimprovethecomputingspeed;Secondly,animprovedgeneticalgorithm,whosechromosomecodingandcross・wayswerechangedtoabetterpattern,WasadoptedtogreatlysimplifythesolutionprocessandcreateadvantagestOquicklyandeffectivelyoptimiz
7、evRPTW.Finally,anautomaticoptimizationondeliveryrouteswaseffectivelyworkedoutthroughtheimplementationofMATLABprogramming.Comparisonsofcomputedresultswithotherimprovedgeneticalgorithmwerecarriedoutunderastudycasetofurtherindicatethattheimprovedgeneticalgorithminthispaperhaveconsiderab
8、leadvantages
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