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简介：Tomeettherequirementsandfunctionsofspacecraftdynamicsimulationandemulationaccordingtodifferentflightperiods,therealizationofrealtimesystemwithdifferentconfigurations,controlofthedevelopmentcycleandexamplesofapplicationarepresentedindetail.Onthebasisofthesatellitedynamicsimulationtechnology,distributednetworkintegratedwiththecomponenttestingplatformsisusedtoconstructamulti-levelbusnetworksystem.Thesystemtakesintofullconsiderationtheconfigurationflexibility,realtimecharacteristicsandextendibility.Testresultsshowthatboththesoftwarealgorithmandthehardwareintegrationofthesystemarecorrectandeffective.Thesystemcouldbeusednotonlyastheeffectivetoolofdesigninganddevelopingthecomponentsandwholeassemblyofsatellitesandmissiles,butalsoforthedynamicsimulationandemulationinallphasesofaspacecraftdevelopmentcycle.

简介：ＣＡＳＥＳＴＵＤＹＯＦＣＡＤＩＣＡＰＰＩＮＴＥＧＲＡＴＩＯＮＦＯＲＲＯＴＡＴＩＯＮＡＬＰＡＲＴＳＷｕＨｏｎｇｍｉｎｇ；ＷａｎｇＹａｐｉｎｇ；ＴａｎｇＲｏｎｇｘｉＣＡＳＥＳＴＵＤＹＯＦＣＡＤＩＣＡＰＰＩＮＴＥＧＲＡＴＩＯＮＦＯＲＲＯＴＡＴＩＯＮＡＬＰＡ...

简介：Windsontheeartharecommonlystrongenoughtoerodetransportanddepositsediment.Themodesofsandtransportbythewindaregreatlydifferentfromthosebywaterflow.Ontheotherhandwind-blownsandsareofamaterialcirculationprocessoftheearthsurface.Theyaffectwind-sandtransportfluxandsandejectionofaflux,thedamageofgrainsformedcannotbeneglectedinengineering.Becauseofthecomplexityofwindblownsandfluxsystem,theunderstandingofitsbasicmechanicsisnotyetclear.Thekeyforcesinsandsalutationmainlyincludes:thevalidgravity,airdragforce'Magnusforce'Saffmanforce'Bassetforce'additionalqualityforceandscatterforceamonggrains.Themostimportantforceinsandsalutationistheairdragforce.Computationofthesinglespheredragcoefficientanddoublespheresdragcoefficientispresentedforthedistancebetweentwospheresbeingsmallerthantwelvetimesofthespherediameterandthespheresbeingatdifferentangularpositions.Theflowinterferenceoftwosphereswasinvestigatedforthedistances=0.08dto12d,angularpositionθ=0to360andReynoldsnumber1≤Re≤1000.

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简介：thereconstructionoftransitionsurfaceisoneoftimeconsumingactivitiesduringsurfacemodelinginreverseengineering.Yetcurrentlyavailablesoftwareapplicationssufferfromshortcominginprocessingtheconnectionamongfreeformsurfaces.Inthispaper,anewmethodisputforwardcombiningSurfacerwithUnigraphicstoresolvethisproblem:CurvesandsurfacesarefirstconstructedinSurfacer,then,thefinisheddataisimportedintoUnigraphicsbasedonIGESformat.Atlast,thetransitionsurfacecanbereconstructedinUnigraphics.Theapplicationofthismethodintransitionsurfacereconstructionisillustratedbymeansoftwocasestudies,showingtheconnectionbetweenfreeformsurfaces;filletingandroundingamongmultiplesurfaces;transitionsurfacebetweentwosetsofsurfaces.

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简介：Internethasgraduallydemonstratedmoreandmoresuperiorityinmoderneducationsystem.Theintelligentonlinedrawingplatformbasedonnetwillprovidelearnerswithastudyingenvironmentwithoutlimitationintimeandspace.Basedonthetheoryofgraphics,thispaperdevelopedanintelligentonlinedrawingplatform(IODP)withJavathroughanalyzingtheteachingcharacterofdescriptivegeometry.IODPdevelopednotonlyhasaflexibledrawingenvironmentwiththefunctionofmutualdrawing,butalsoisabletojudgethedrawingmadebystudentsandgivefeedbackatthesametime.ThisplatformgivesaneffectivewayforInterneteducationonengineeringgraphics.

简介：StateofCharge(SOC)isusedtoadjusttheinitializationSOCvaluesoastomakeelectricvehiclesimulationresultsclosetorealvehicleperformance.ThispaperfirstlyanalysesthebatterySOCcorrectalgorithm,thenusesADVISORwhichisaelectricvehiclesimulationsoftwaretosimulateahybridelectriccarwiththreedifferentcasesofnoSOCcorrect,linearSOCcorrectandzerodeltaSOCcorrect,aswellasmakesthecompareandanalysisforthosesimulationresults.Intheend,anoverallconclusiontoSOCcorrectalgorithmisgiven.

简介：PartandDraftmodulesofSolidEdgeareusedtoconstruct3Dsolidmodelsandgeneratepartdrawings,whileActiveXAutomationofVBisusedtoaccessengineeringdatabasefilestorealizedimension-drivenmodificationofthedesignedparts.Moreover,VBplaystheenablingroleofintegratingallworkprocessesofgearpumpdesign,resultinginacomprehensiveCADsystem.

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