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1、福建農(nóng)林大學(xué)碩士學(xué)位論文基于聚類分析和遺傳算法的帶時(shí)間窗車輛路徑問(wèn)題研究姓名:林郁丞申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):交通運(yùn)輸規(guī)劃與管理指導(dǎo)教師:張正雄20090401基于聚類分析和遺傳算法的帶時(shí)間窗車輛路徑問(wèn)題研究RearchontheVehicleRoutingProblemwithTimeWindowsBasedonClusterAnalysisandGeneticAlgorithmAbstract:VehicleRoutingProblem(VRP)isoneofthekeyprocessesoflogisticsdistribution.Ascompetitio
2、nsamonglogisticsdistributionindustryaregettingmoreandfiercerandcustomers’requirementsforatime?effectivelogisticsdistributionarebecomingmoreandmoreintense,studiesonVRP,especiallyVehicleRoutingProblemwithTimewindows(VRPTW),arepracticallysignificantoneveryaspectoflogisticsdistributionin
3、dustry.Transportationcompaniescanimprovetheirservicesbyprovidingtheircustomers塒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沖Wassimplifiedintosmall?scaleVfuPbyusingk-meansclusteran
6、alysistodividethedistributionnetworkinordertoreducecomputationwhileimprovethecomputingspeed;Secondly,animprovedgeneticalgorithm,whosechromosomecodingandcross?wayswerechangedtoabetterpattern,WasadoptedtogreatlysimplifythesolutionprocessandcreateadvantagestOquicklyandeffectivelyoptimiz
7、evRPTW.Finally,anautomaticoptimizationondeliveryrouteswaseffectivelyworkedoutthroughtheimplementationofMATLABprogramming.Comparisonsofcomputedresultswithotherimprovedgeneticalgorithmwerecarriedoutunderastudycasetofurtherindicatethattheimprovedgeneticalgorithminthispaperhaveconsiderab
8、leadvantages