十字路口红绿灯的控制效应(英文)

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1、THEEFFECTOFTRAFFICLIGHTCONTROLONASINGLEINTERSECTION(collegeofPhysicsandelectronicsengineeringofGuangxiNormaluniversity,Guilin541004,Guangxi,China)Acellularautomatamodelforasingleintersectionwithopenboundaryconditionsispresented.Inthismodel,thevehiclesareallowedtoturntheirdirectionswithap

2、robability.Weanalyzethetrafficflowcharacteristicsofthemodelandtheoptimizationofgreenratio.Thesimulationsunderdifferenttrafficconditionsaregiven.Itcanbefoundthattheoptimizationofgreenratiodependsontheboundaryconditionsbutindependentsontheperiodoftrafficlight.Thereisaoptimumrangeofgreenrat

3、ioforfixedboundarycondition.Theinfluenceofturningprobabilityontrafficflowisalsodiscussed.Turningpermissionleadstothedisappearofcongestiononstreet.Keywords:cellularautomatamodel;optimumgreenratio,openboundary;singleintersection1.IntroductionInrecentyears,trafficjamshavebecomethemostdiffic

4、ultproblemincity.Andwecanfindthattrafficjamsalwaysappearneartheintersections.Atthecontrolledintersections,trafficlightshaveimportantinfluenceuponthetrafficflow.Ifthetrafficsignalsettingisunsuitable,itwillnotonlyhasdestructiveeffectsontraffic.butalsoendangerthepedestrians.So,howtooptimumt

5、hetrafficsettingisthemainconcernforthetrafficengineersandresearchers.Anumberoftrafficsignalcontrolmodelshavebeendevelopedinthepast.Thesemodelsareusuallyformulatedusingthelanguafeofcellularautomata(CA).ThefirstmodelofcitytrafficwasintroducedbyBiham,MiddletonandLevine(BML).Thismodelcanpred

6、ictasortofphasetransitionfromfree-flowtoajammedstate,butthemodelassumptionsaretoosimpletobetakenseriouslyforpracticalpurpose.LateramoreseriousmodelofcitynetworkwasintroducedbyChowdhuryandSchadschneider(ChSch).ThismodelcombinestheBMLmodelandNagel-Schreckenberg(NaSch)modelofhighwaytraffic.

7、Itcandemonstrateaphasetransitionfromthe“free-flowing”phasetothecompletely“jamming”phaseatavehicledensity.Anditalsogivesthetimedependenceoftheaveragespeedsofthecars.Inaveryrecentyears,theChSchmodelwasextendedbyE.Brockfeldtoaccountfordifferenttypesofglobalsignalization.Base