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1、外文資料IntegratedVirtualAssemblyProcessPlanningSystemLIUJianhuaHOUWeiweiSHANGWeiNINGRuxinSchoolofMechanicalEngineeringBeijingInstituteofTechnologyBeijing100081ChinaReceivedDecember232008revisedJuly132009acceptedAugust132009

2、publishedelectronicallyAugust142009CHINESEJOURNALOFMECHANICALENGINEERINGVol.22No.52009Abstract:Assemblyprocessplanning(APP)fcomplicatedproductsisatimeconsumingdifficultwkwithconventionalmethod.Virtualassemblyprocessplann

3、ing(VAPP)providesengineersanewefficiencyway.PreviousstudiesinVAPParealmostisolateddispersivehavenotestablishedawholeunderstingdiscussedkeyrealizationtechniquesofVAPPfromasystemicintegratedview.Theintegratedvirtualassembl

4、yprocessplanning(IVAPP)systemisanewvirtualrealitybasedengineeringapplicationwhichoffersengineersanefficientintuitiveimmersiveintegratedmethodfassemblyprocessplanninginavirtualenvironment.Basedonanalysistheinfmationintegr

5、ationrequirementofVAPPthearchitectureofIVAPPisproposed.ThroughtheintegratedstructureIVAPPsystemcanrealizeinfmationintegrationwkflowcontrolling.IndertomodeltheassemblyprocessinIVAPPahierarchicalassemblytasklist(HATL)ispre

6、sentedinwhichdifferentassemblytasksfassemblingdifferentcomponentsareganizedintoahierarchicallist.Aprocessientedautomaticgeometricalconstraintrecognitionalgithm(AGCR)isproposedsothatgeometricalconstraintsbetweencomponents

7、canbeautomaticallyrecognizedduringtheprocessofinteractiveassembling.Atthesametimeaprogressivehierarchicalreasoning(PHR)modelisdiscussed.AGCRPHRwillgreatlyreducetheinteractivewkload.Adiscretecontrolnodemodel(DCNM)fcableha

8、rnessassemblyplanninginIVAPPisdetailed.DCNMconvertsacableharnessintocontinuousflexedlinesegmentsconnectedbyaseriesofsectioncenterpointsdesignscanrealizecableharnessplanningthroughcontrollingthosecontrolnodes.Mechanicalas

9、semblies(suchastransmissioncaseengineofautomobile)areusedtoillustratethefeasibilityoftheproposedmethodalgithms.TheapplicationofIVAPPsystemrevealsadvantagesoverthetraditionalassemblyprocessplanningmethodinshteningthetimec

10、onsumedinassemblyplanninginminimizingthehlingdifficultyexcessivereientationdissimilarityofassemblyoperations.theexperienceofassemblyoperats.Significantprogresseshavebeenmadepreviouslyinestablishingavirtualenvironment(VE)

11、tomake“assistwith”assemblyplanningrelatedengineeringdecisions.Theyprovideanimptantbasisfthecurrentwk.Howeversomeimptantkeyrealizationtechniquessuchasinfmationintegrationassemblymodelautomaticgeometryconstraintrecognition

12、cableharnessassemblyprocessplanningarenotdescribedindetail.Thepurposeofthispaperistodescribethepreliminaryresultsofanintegratedvirtualassemblyprocessplanning(IVAPP)systemsomekeyrealizationtechniquesintheIVAPPsuchasthearc

13、hitectureofIVAPPhierarchicalassemblytasklist(HATL)fourlayercollisiondetectionalgithm(FLCDA)discretecontrolnodemodel(DCNM)fcableharnessassemblyplanninginavirtualenvironmentarediscussed.2KeyTechniquesofIVAPPSystem2.1Archit

14、ectureofIVAPPInavirtualenvironmentthemostcommonwaytoexpressthepartmodelisbasedonapolygonaldeionsatisfyingtherealtimerequirement.HenceCADmodelshavetobepolygonizedinavirtualenvironment.Howeverthispolygonizationthrowsawaymu

15、chsemanticinfmationwhichisimptantfautomaticgeometricalconstraintrecognitionintheIVAPPsystem.ThustheadditionalinfmationmustbeexptedfromtheCADmodelsothersystemstransferredtotheIVAPPsystem.IntheIVAPPsystemthemodeldatacomefr

16、omtwoplacesasfollows.(1)ThegeometryinfmationdataobtainedfromCADmodelsincludingpolygonalmodelconstraintrelationsbetweenthepartssubassembliesBRepdata(includingsurfacesitsoutlinestheboundaryedgessomeimptantaxes)ofthepartsth

17、efinallocationsientationsofthepartssubassemblies.(2)Thegeneralinfmationdataobtainedfromproductdatamanagement(PDM)systemincludeparts’nametypematerialmassvolumesoon.Meanwhileasoneofthecomponentsinthewholevirtualproductdeve

18、lopmentintegrationsystemIVAPPsystemmustrealizeinfmationintegrationwithothersystems.TheIVAPPsystemrealizesinfmationintegrationthroughthePDMsystem.TheIVAPPsystemrealizesdatasharingflowcontrollingthroughthePDMsystem.CADmode

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