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近似动态规划方法及其在交通中的应用(3)

发布时间:2021-06-06   来源:未知    
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ABSTRACT

ABSTRACT

Thisdissertationfocusedonsomeissuesonapproximatedynamicprogramming(ADP)anditsapplicationsintransportation.Themainworkandkeycontributionswere

assummarized

1.Basedthefollowing:Steffensen’Smethodandformerweights’values,anewoptimizedon

acceleratedalgorithmwaspresentedforneuralnetwork.Onthebasisofthisnewoptimizedacceleratedalgorithm,anewADHDP(Action.DependentHeurigicDynamicProgramming)method

proposed.Abasedonformerweights’valuewasmadedata(ADHDP(D)forshort)wasADHDPandADHDP(D).detaileQanalysisbetweenthe

Simulationresultsshowedthegoodperformanceofthisnewalgorithm.Furthermore,aninitialweightscompositionalmethodwasproposed.Simulationresultsdemonstratedtheconvergencepropertyisimprovedeffectivelyincomparisonwithinitialweightsrandomlypreassigned.

2.Consideringonthattrafficsystemis

onastrongnonlinearanduncertainsystem,anidentificationmethodbasedADPwasdevelopedtoestimatetheparametersofthe

generaldiscrete—timenonlineartrafficflowsystem.Withrigorousanalysis,itwasshownthattheproposedidentificationscheme,independentoftheprecisetrafficflow

tomodel,canguaranteetheconvergence.Anumberofsimulationresultswereprovided

theefficacyoftheproposedapproach.

3.Anadaptivesingle—exponentsmoothingbasedonADPwasputforwardtoselectthesmoothingcoefficientdynamically.Withrigorousanalysis,itwasshownthattheproposedpredictionschemecanguaranteetheconvergence.Thesimulationresultsverifidtheeffectivenessoftheproposedalgorithm.

4.Theoptimal

onsignaltimingproblemwasinvestigatedforanurbanintersection.BasedthetechniqueADP,theoptimalsignaltimingcontrollerswere

proposedforthetwo—phaseintersectionandthree—phaseintersection,respetively.ThesimulationexamplesshowedthatthecontrolalgorithmbasedonADPcanallocategreentimerationallyandachievetheequilibriumofqueuelength.Furthermore,takingtheoptimalsignaltimingofthree—phaseintersectionforexample,simulationsverifidthattheinitialweightsaffecttheconvergenceresult.

5.BasedonthetechniqueofADRtheproblemsoflocalrampandcoordinatedramp

toavoidthemeteringwerediscussed.TheADPcontrollerwasdesigneddifficultyof

trafficflowmodeling.SimulationresultsdemonstratedthenewcontrollershavebetterV

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