外文翻译--新颖的夹具设计和基于虚拟现实的装配系统 英文版.pdf

PROCEEDINGSOFTHE2006IEEE/RSJINTERNATIONALCONFERENCEONINTELLIGENTROBOTSANDSYSTEMSOCTOBER915,2006,BEIJING,CHINAANOVELMODULARFIXTUREDESIGNANDASSEMBLYSYSTEMBASEDONVRPENGGAOLIANG,LIUWENJIANSCHOOLOFMECHATRONICSENGINEERINGHARBININSTITUTEOFTECHNOLOGYHARBIN,150001,CHINAPGL7782AHITEDUCNABSTRACTMODULARFIXTURESAREONEOFTHEIMPORTANTASPECTSOFMANUFACTURINGTHISPAPERPRESENTSADESKTOPVRSYSTEMFORMODULARFIXTUREDESIGNTHEVIRTUALENVIRONMENTISDESIGNEDANDTHEDESIGNPROCEDUREISPROPOSEDITASSISTSTHEDESIGNERTOMAKETHEFEASIBLEDESIGNDECISIONSEFFECTIVELYANDEFFICIENTLYAHIERARCHICALDATAMODELISPROPOSEDTOREPRESENTTHEMODULARFIXTUREASSEMBLYBASEDONTHISSTRUCTURE,THEUSERCANMANIPULATETHEVIRTUALMODELSPRECISELYINVEDURINGTHEDESIGNANDASSEMBLYPROCESSESMOREOVER,THEMACHININGSIMULATIONFORMANUFACTURINGINTERACTIONCHECKINGISDISCUSSEDANDIMPLEMENTEDFINALLY,THECASESTUDYHASDEMONSTRATEDTHEFUNCTIONALITYOFTHEPROPOSEDSYSTEMCOMPAREDWITHTHEIMMERSIVEVRSYSTEM,THEPROPOSEDSYSTEMHASOFFEREDANAFFORDABLEANDPORTABLESOLUTIONFORMODULARFIXTURESDESIGNINDEXTERMSMODULARFIXTURE,DESKTOPVR,ASSEMBLYDESIGN,MACHININGSIMLULATIONIINTRODUCTIONMODULARFIXTURESAREONEOFTHEIMPORTANTASPECTSOFMANUFACTURINGPROPERFIXTUREDESIGNISCRUCIALTOPRODUCTQUALITYINTERMSOFPRECISION,ACCURACY,ANDFINISHOFTHEMACHINEDPARTMODULARFIXTUREISASYSTEMOFINTERCHANGEEABLEANDHIGHLYSTANDARDIZEDCOMPONENTSDESIGNEDTOSECURELYANDACCURATELYPOSITION,HOLD,ANDSUPPORTTHEWORKPIECETHROUGHOUTTHEMACHININGPROCESS1TRADITIONALLY,FIXTUREDESIGNERSRELYONEXPERIENCEORUSETRIALANDERRORMETHODSTODETERMINEANAPPROPRIATEFIXTURINGSCHEMEWITHTHEADVENTOFCOMPUTERTECHNOLOGY,COMPUTERAIDEDDESIGNHASBEENPREVALENTINTHEAREAOFMODULARFIXTUREDESIGNINGENERAL,THEASSOCIATEDFIXTUREDESIGNACTIVITIES,NAMELYSETUPPLANNING,FIXTUREELEMENTDESIGN,ANDFIXTURELAYOUTDESIGNAREOFTENDEALTWITHATTHEDOWNSTREAMENDOFTHEMACHINETOOLDEVELOPMENTLIFECYCLETHESEPRACTICESDONOTLENDTHEMSELVESWELLTOTHEBRIDGINGOFDESIGNANDMANUFACTURINGACTIVITIESFOREXAMPLE,VERYFEWSYSTEMSHAVEINCORPORATEDTHEFUNCTIONALITYOFDETECTINGMACHININGINTERFERENCETHISLEADSTOAGAPBETWEENTHEFIXTUREDESIGNANDMANUFACTURINGOPERATIONSWHERETHEASPECTOFCUTTERPATHSISNOTCONSIDEREDDURINGTHEDESIGNSTAGE2ASARESULT,REDESIGNCANNOTBEAVOIDEDWHENTHECUTTERISFOUNDTOINTERFEREWITHTHEFIXTURECOMPONENTSINTHEMANUFACTURINGSETUPTHEREFORE,INORDERTOBRINGMACHININGFIXTUREDESIGNINTOTHEARENAOFFLEXIBLEMANUFACTURING,AMORESYSTEMATICANDNATURALDESIGNENVIRONMENTISREQUIREDASASYNTHETIC,3D,INTERACTIVEENVIRONMENTTYPICALLYGENERATEDBYACOMPUTER,VRHASBEENRECOGNIZEDASAVERYPOWERFULHUMANCOMPUTERINTERFACEFORDECADES4VRHOLDSGREATPOTENTIALINMANUFACTURINGAPPLICATIONSTOSOLVEPROBLEMSBEFOREBEINGEMPLOYEDINPRACTICALMANUFACTURINGTHEREBYPREVENTINGCOSTLYMISTAKESTHEADVANCESINVRTECHNOLOGYINTHELASTDECADEHAVEPROVIDEDTHEIMPETUSFORAPPLYINGVRTODIFFERENTENGINEERINGAPPLICATIONSSUCHASPRODUCTDESIGN5,ASSEMBLY6,MACHININGSIMULATION7,ANDTRAINING8THEGOALOFTHISPAPERISTODEVELOPAVRBASEDMODULARFIXTURESDESIGNSYSTEMVMJFDSTHISISTHEFIRSTSTEPTODEVELOPANINTEGRATEDANDIMMERSIVEENVIRONMENTFORMODULARFIXTUREDESIGNTHISAPPLICATIONHASTHEADVANTAGESOFMAKINGTHEFIXTUREDESIGNINANATURALANDINSTRUCTIVEMANNER,PROVIDINGBETTERMATCHTOTHEWORKINGCONDITIONS,REDUCINGLEADTIME,ANDGENERALLYPROVIDINGASIGNIFICANTENHANCEMENTOFFIXTUREPRODUCTIVITYANDECONOMYIIOVERVIEWOFTHEPROPOSEDSYSTEMTHESYSTEMARCHITECTUREOFTHEPROPOSEDDESKTOPVRSYSTEMISMODULARISEDBASEDONTHEFUNCTIONALREQUIREMENTSOFTHESYSTEM,WHICHISSHOWNINFIG1ATTHESYSTEMLEVEL,THREEMODULESOFPROPOSEDSYSTEM,NAMELY,GRAPHICINTERFACEGUI,VIRTUALENVIRONMENTVEANDDATABASEMODULESAREDESIGNEDFOREACHOFTHEMODULES,ASETOFOBJECTSHASBEENIDENTIFIEDTOREALIZEITSFUNCTIONALREQUIREMENTSTHEDETAILEDOBJECTDESIGNANDIMPLEMENTATIONAREOMITTEDFROMTHISPAPERINSTEAD,THEBRIEFDESCRIPTIONOFTHESETHREEMODULESISGIVENBELOW1GRAPHICINTERFACEGUITHEGUIISBASICALLYAFRIENDLYGRAPHICINTERFACETHATISUSEDTOINTEGRATETHEVIRTUALENVIRONMENTANDMODULARFIXTUREDESIGNACTIONS2VIRTUALENVIRONMENTVETHEVEPROVIDESTHEUSERSWITHA3DDISPLAYFORNAVIGATINGANDMANIPULATINGTHEMODELSOFMODULARFIXTURESYSTEMANDITSCOMPONENTSINTHEVIRTUALENVIRONMENTASSHOWNINFIG1,THEVIRTUALENVIRONMENTMODULECOMPRISESTWOPARTS,NAMELYASSEMBLYDESIGNENVIRONMENTANDMACHININGSIMULATIONENVIRONMENTTHEUSERSELECTSAPPROPRIATEELEMENTSANDPUTSDOWNTHESEELEMENTSONTHEDESKINTHEASSEMBLYDESIGNAREATHENHEASSEMBLESTHESELECTEDELEMENTSONEBYONETOBUILDUPTHEFINALFIXTURESYSTEMWITHTHEGUIDANCEOFTHESYSTEM142440259X/06/2000C2006IEEE2650AUTHORIZEDLICENSEDUSELIMITEDTONANCHANGUNIVERSITYDOWNLOADEDONDECEMBER20,2009AT2244FROMIEEEXPLORERESTRICTIONSAPPLYFIG1OVERVIEWOFTHEDESKTOPVRBASEDMODULARFIXTUREDESIGNSYSTEM3DATABASETHEDATABASEDEPOSITALLOFTHEMODELSOFENVIRONMENTANDMODULARFIXTUREELEMENTS,ASWELLASTHEDOMAINKNOWLEDGEANDUSEFULCASESTHEREARE5DATABASESSHOWNINFIG1AMONGTHEM,KNOWLEDGERULEBASEGOVERNINGALLFIXTUREPLANNINGPRINCIPLESFORMSTHEBRAINSOFTHESYSTEMIIIPROCEDUREOFMODULARFIXTUREDESIGNINTHISSECTION,ANINSTRUCTIVEMODULARFIXTUREDESIGNPROCEDUREWITHINVEISPRESENTEDBESIDESTHE3DDEPTHTHATTHEUSERSFEELANDTHEREALWORLDLIKEOPERATIONPROCESS,THISPROCEDUREFEATURESINTELLIGENCEANDINTRODUCTIONDURINGTHEDESIGNPROCESS,SOMEUSEFULCASESANDSUGGESTIONWILLBEPRESENTEDTOTHEUSERFORREFERENCEBASEDONINTELLIGENTINFERENCEMETHODSUCHASCASEBASEDREASONINGCBRANDRULEBASEDREASONINGRBRFURTHERMORE,RELATIVEKNOWLEDGEANDRULESAREPRESENTEDASHELPPAGESTHATTHEUSERCANEASILYBROWSEDDURINGTHEDESIGNPROCESSOVERVIEWOFMODULARFIXTUREDESIGNPROCESSISSUMMARIZEDINFIG2AFTERTHEVEENVIRONMENTISINITIALEDANDTHEWORKPIECEISLOADED,THEFIRSTSTEPISFIXTUREPLANNINGINTHISSTEP,THEUSERFIRSTDECIDESTHEFIXTURINGSCHEME,THATISSPECIFIESTHEFIXTURINGFACESOFTHEWORKPIECEINTERACTIVELYFORHELPTHEUSERSDECISIONMAKING,SOMEUSEFULCASESASWELLASTHEIRFIXTURINGSCHEMEWILLBEPRESENTEDVIATHEAUTOMATICCBRRETRIEVALMETHODONCETHEFIXTURINGFACESARESELECTED,THEUSERMAYBEPROMPTTOSPECIFYTHEFIXTURINGPOINTSINTHISTASK,SOMESUGGESTIONSANDRULESAREGIVENAFTERTHEFIXTURINGPLANNING,THENEXTSTEPISFIXTUREFUSDESIGNSTAGEINTHISSTAGE,THEUSERMAYBETOSELECTSUITABLEFIXTUREELEMENTSANDASSEMBLETHESEINDIVIDUALPARTSINTOFUSACCORDINGTOTHESPATIALINFORMATIONOFTHEFIXTURINGPOINTSINRELATIONTOTHEFIXTUREBASEANDTHEWORKPIECE,SOMETYPICALFUSANDSUGGESTIONSMAYBEPRESENTEDAUTOMATICALLYTHESEWILLBEHELPFULFORTHEUSERAFTERTHEPLANNINGANDFUSDESIGNSTAGE,THENEXTSTAGEISINTERACTIVELYASSEMBLINGTHEDESIGNEDFIXTUREFUSTOCONNECTTHEWORKPIECETOTHEBASEPLATEWHENTHEFIXTURECONFIGURATIONISCOMPLETED,THERESULTWILLBECHECKEDANDEVALUATEDWITHINTHEMACHININGENVIRONMENTTHETASKSEXECUTEDINTHISENVIRONMENTINCLUDINGASSEMBLYPLANNING,MACHININGSIMULATION,ANDFIXTUREEVALUATIONASSEMBLYPLANNINGISUSEDTOGAINOPTIMALASSEMBLYSEQUENCEANDASSEMBLYPATHOFEACHCOMPONENTMACHININGSIMULATIONISRESPONSIBLEFORMANUFACTURINGINTERACTIONDETECTIONFIXTUREEVALUATIONWILLCHECKANDEVALUATETHEDESIGNRESULTINCONCLUSION,THEWHOLEDESIGNPROCESSISINANATUREMANNERFORTHEBENEFITOFVEMOREOVER,THEPRESENTEDINFORMATIONOFSUGGESTIONANDKNOWLEDGECANADVISETHEUSERONHOWTOMAKEDECISIONSOFTHEBESTDESIGNSELECTIONIVASSEMBLYMODELINGOFMODULARFIXTUREAMODULARFIXTURESTRUCTUREANALYSISAFUNCTIONALUNITFUISACOMBINATIONOFFIXTUREELEMENTSTOPROVIDECONNECTIONBETWEENTHEBASEPLATEANDAWORKPIECE11GENERALLY,MODULARFIXTURESTRUCTUREMAYBEDIVIDEDINTOTHREEFUNCTIONALUNITSACCORDINGTOITSBASICSTRUCTURECHARACTERISTICS,NAMELYLOCATINGUNIT,CLAMPINGUNIT,ANDSUPPORTINGUNITTHENUMBEROFFIXTUREELEMENTSINAFUMAYCONSISTOFONEORMOREELEMENTS,INWHICHONLYONEELEMENTSERVESASALOCATOR,SUPPORTORCLAMPTHEMAJORTASKOFTHEMODULARFIXTUREASSEMBLYISTOSELECTTHESUPPORTING,LOCATING,CLAMPINGANDACCESSORYELEMENTSTOGENERATETHEFIXTUREFUSTOCONNECTTHEWORKPIECETOTHEBASEPLATEBYANALYZINGTHEPRACTICALAPPLICATIONOFMODULARFIXTURES,ITISFOUNDTHATTHEASSEMBLYOFMODULARFIXTURESBEGINSBYSELECTINGTHESUITABLEFIXTUREELEMENTSTOCONSTRUCTFUS,THENSUBSEQUENTLYMOUNTINGTHESEFUSONTHEBASEPLATETHEREFORE,THEFUSCANBEREGARDEDASSUBASSEMBLIESOFMODULARFIXTURESYSTEMFURTHER,THESTRUCTUREOFMODULARFIXTURESYSTEMCANBEREPRESENTEDASAHIERARCHALSTRUCTUREASSHOWNINFIG32651AUTHORIZEDLICENSEDUSELIMITEDTONANCHANGUNIVERSITYDOWNLOADEDONDECEMBER20,2009AT2244FROMIEEEXPLORERESTRICTIONSAPPLYUSEFTA6TSIIKGSUGGELR,LFIXTUIEELEMENETSRUETRIEVALI0TOOLSRKETRIEVAL4FIG2MODULARFIXTUREDESIGNPROCEDUREINPROPOSEDSYSTEMBHIERARCHICALLYSTRUCTUREDDATAMODELFORMODULARFIXTUREREPRESENTATIONINVEITISCOMMONTHATTHECORRESPONDINGVIRTUALENVIRONMENTMAYCONTAINMILLIONSOFGEOMETRICPOLYGONPRIMITIVESOVERTHEPASTYEARS,ANUMBEROFMODELSUBDIVISIONSCHEMES,SUCHASBSPTREE10ANDOCTREES,HAVEBEENPROPOSEDTOORGANIZELARGEPOLYGONALMODELSHOWEVER,FORMODULARBA1I_}1HSREPLALTEBANSEPLA1NTEELEMENTSLOCATNGELEMENTSL,CATINGUNITSACCESSORYELLEMENTSCLAMNPINGELEMNENTSCLAMPINGUNITSSUPPORTINGELEMNTSSUPPORTINGUFNITSACCESSORYELEMENTSFIG3HIERARCHICALSTRUCTUREOFMODULARFIXTURESYSTEMDESIGNAPPLICATIONS,THESCENEISALSODYNAMICALLYCHANGING,DUETOINTERACTIONSFOREXAMPLE,INDESIGNPROCESS,THEPARTOBJECTMAYCHANGEITSSPATIALPOSITION,ORIENTATIONANDASSEMBLYRELATIONSTHISINDICATESTHATASTATICREPRESENTATION,SUCHASBSPTREE,ISNOTSUFFICIENTFURTHERMORE,THEABOVEMODELSCANONLYREPRESENTTHETOPOLOGYSTRUCTUREOFFIXTURESYSTEMINTHECOMPONENTLEVELHOWEVER,TOTHEASSEMBLYRELATIONSHIPAMONGFIXTURECOMPONENTS,WHICHREFERSTOTHEMATINGRELATIONSHIPBETWEENASSEMBLYFEATURESTHATISNOTCONCERNEDINTHISSECTION,WEPRESENTAHIERARCHICALLYSTRUCTUREDANDCONSTRAINTBASEDDATAMODELFORMODULARFIXTURESYSTEMREPRESENTATION,REALTIMEVISUALIZATIONANDPRECISE3DMANIPULATIONINVEASSHOWNINFIG4,THEHIGHLEVELCOMPONENTBASEDMODELISUSEDFORINTERACTIVEOPERATIONSINVOLVINGASSEMBLIESORDISASSEMBLESITPROVIDESBOTHTOPOLOGICALSTRUCTUREANDLINKRELATIONSBETWEENCOMPONENTSTHEINFORMATIONREPRESENTEDINTHEHIGHLEVELMODELCANBEDIVIDEDINTOTWOTYPES,IECOMPONENTOBJECTSANDASSEMBLYRELATIONSHIPSCOMPONENTOBJECTSCANBEASUBASSEMBLYORAPARTASUBASSEMBLYCONSISTSOFINDIVIDUALPARTSANDASSEMBLYRELATIONSHIPSBETWEENTHEPARTSCOMPONENTLEVELPTPARTSSUBASSEMBLYASSEMBLYRELATIONSHIPFEATURELEVELFT3FEATUREFEATUREMATINGRELATIONSHIPTTPOLYGONLEVELFZLLPOLYGONFIG4THEHIERARCHICALSTRUCTUREDATAMODELINVETHEMIDDLELEVELFEATUREBASEDMODELISBUILTUPONFEATURESANDFEATURECONSTRAINTSINGENERAL,THEASSEMBLYRELATIONSHIPOFTENTREATEDASTHEMATINGRELATIONSHIPSBETWEENASSEMBLYFEATURESTHUSTHEFEATUREBASEDMODELISUSEDTODESCRIBETHEASSEMBLYRELATIONSHIPANDPROVIDESNECESSARYINFORMATIONFORSPATIALRELATIONSHIPCALCULATINGDURINGASSEMBLYOPERATIONINTHISMODEL,ONLYTHEFEATURERELATIONSHIPSBETWEENTWODIFFERENTCOMPONENTSARECONSIDEREDTHERELAT