代理控制交通灯-毕业设计外文资料翻译

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1、外文资料AgentcontrolledtrafficlightsIntroductionThequalityof(urban)trafficcontrolsystemsisdeterminedbythematchbetweenthecontrolschemaandtheactualtrafficpatterns.Iftrafficpatternschange,whattheyusuallydo,theeffectivenessisdeterminedbythewayinwhichthesystemadaptstothesec

2、hanges.Whenthisabilitytoadaptbecomesanintegralpartofthetrafficcontrolunititcanreactbettertochangesintrafficconditions.Adjustingatrafficcontrolunitisacostlyandtimelyaffairifitinvolveshumanattention.Thehypothesisisthatitmightofferadditionalbenefitusingself-evaluating

3、andself-adjustingtrafficcontrolsystems.Thereisalreadyamarketforanurbantrafficcontrolsystemthatisabletoreactiftheenvironmentchanges;thesocalledadaptivesystems."Real"adaptivesystemswillneedpro-activecalculatedtrafficinformationandcycleplans-basedonthesecalculatedtraf

4、ficconditions-tobeupdatedfrequently.Ourresearchoftheusabilityofagenttechnologywithintrafficcontrolcanbesplitintotwoparts.Firstthereisatheoreticalpartintegratingagenttechnologyandtrafficcontrol.Thefinalstageofthisresearchfocusesonpracticalissueslikeimplementationand

5、performance.Herewepresenttheconceptsofagenttechnologyappliedtodynamictrafficcontrol.Currentlywearedesigningalayeredmodelofanagentbasedurbantrafficcontrolsystem.Wewillelaborateonthatinthelastchapters.AdaptiveurbantrafficcontrolAdaptivesignalcontrolsystemsmusthaveaca

6、pabilitytooptimisethetrafficflowbyadjustingthetrafficsignalsbasedoncurrenttraffic.Allusedtrafficsignalcontrolmethodsarebasedonfeed-backalgorithmsusingtrafficdemanddata-varyingfromyearstoacoupleofminutes-inthepast.Currentadaptivesystemsoftenoperateonthebasisofadapti

7、vegreenphasesandflexibleco-ordinationin(sub)networksbasedonmeasuredtrafficconditions(e.g.,UTOPIA-spot,SCOOT).Thesemethodsarestillnotoptimalwheretrafficdemandchangesrapidlywithinashorttimeinterval.Thebasicpremiseisthatexistingsignalplangenerationtoolsmakerationaldec

8、isionsaboutsignalplansundervaryingconditions;butalmostnoneofthecurrentavailabletoolsbehavepro-activelyorhavemeta-rulesthatmaychangebehaviourofthe