FloMcad 教程corso

FloMcadTraining,CurrentToolsFLO/MCAD,FLO/MCADisamoduletoenablethetransferofdatafromMCADenvironmentsto:FLOTHERMforthermalanalysisofelectronicequipmentFLO/EMCforemcanalysisofelectronicequipmentBasedonACISsolidmodellingkernalfromSpatialTechnology3DgeometryisimportedintoFLO/MCAD,thegeometryprepared,abstractedandthenconvertedintoFLOTHERM/EMCobjects,SectionTitle,ImportingCADfilesusingFLO/MCAD,ImportCADfilesintoFLOTHERMusingFLO/MCAD()ReadsACIS(.sat),STEP(.stp),IGES(.igs)andSTL(.stl)neutraldatafiles(partsandassemblies)ReadsnativeProE,Solidworks,andCatiafiles(partsandassemblies)SimplifiesMCADgeometryConvertsMCADgeometryintoFLOTHERMentitiesTransfersconvertedmodelintothecurrentFLOTHERMprojectDatacanalsobetransferredfromFLOTHERMtoFLO/MCAD,StartingFlomCAD,LaunchdirectlyfromFlothermProjectManagerLinkbetweenthetwotoolsAlltheCadgeometrieswillbetransferredinthecurrentprojectafterhavebeenmodified,Importinggeometry,FLOMCADcanimporteithernativefilesfromProE,SolidWorks,CatiaorgenericfilesinIGES,SAT,STEPandSTLformats,DataImport,FLO/MCADusestheACISsolidmodellingkernelIncomingdatahastobeconvertedtoACISformatThisconversionisdonebyTranslator(read)Husks,FLO/MCADACIS(SAT),FLOTHERM,SAT,DataHealing,AfterthedataisconvertedtoanACISobjectitisthenhealedWhatishealing?“Theprocessofconvertinggeometrytoamanifoldobject”Whatisamanifoldobject?,.acollectionoffaceswithnofreeedges,DataHealing,UnhealedgeometryHowcanyoutell?,DataHealing,Whyishealingimportant?NearlyallSimplificationandDissectionroutinesrelyonthecalculationofanMCADbodyvolumeAvolumecanonlybecalculatediftheobjectismanifoldIGESdatatolerance/accuracyThetolerancetowhichanIGESfileisgeneratedwilldeterminewhetherornotthemodelcanbehealedbyFLO/MCADAtoleranceof1e-6(0.000001)ispreferableAtoleranceof1e-3(0.001)isoftengoodenough,ThetolerancesettingtobemadebeforetheIGESexportisessentialasitdetermineswhether2pointsareconsideredtobecoincidentornot.Ifthissettingisnotmadethenanobjectthatismeanttobesolid(manifold)maybeseenonimportasbeinghollow(non-manifold).Evenifthetoleranceissetproperly,whenthemodelisregeneratedbeforeexportfromtheMCADtooltheachievedtolerancemaybegreaterthan1e-6duetohowthemodelwasconstructed.Thisisnotaproblemiftheachievedtoleranceisoftheorderof1e-6to1e-4.Iftheachievedtoleranceisoftheorderof1e-3to1e-1thenitislikelythatthemodelwillfailtohealonimport.ThesizeofanexportedIGESfileisadominantfactor.SmallerIGESfileswillbeeasiertotransferfrommachinetomachineandwillalsobelesslikelytofailonimportintotheFLO/MCADAW.AlthoughitisdifficulttoputamaximumadvisablesizeontheIGESfile,filesgreaterthan20MBorsomaybepronetoimportproblems.,Managinggeometry,MousemodeRotateandmovegoemetriesSelectionModeSelectdifferentpartsanddetailsMousemodeSelectitems,Selectingparts,Selectingparts,McadAssemblytree,Managinggeometries,“Move”thehierarchy,Managinggeometries,Hideorrevealparts,Managinggeometries,Pictureoptions,Example:wireframe,Simplifyingthegeometry,“Clean”geometryfromnotthermalinterestingdetailsTwoways:,Selectanddelete,GlobalSimplify,DataSimplification,Whatisthebenefitofsimplification?ThermalsimplificationresultsinanefficientANDaccuratethermalmodel.,Whatconstitutesathermalsimplification?Theremovalofthermallyinsignificantgeometrye.g.:Smallholes.Smallhumps.Smallchamfersandfillets.,Whentosimplify?IntheMCADtool(mostpreferably),FLO/MCADorFLOTHERMitself.,DataSimplification,Thegoldenruleofgeometricsimplification:“SimplifyatleasttotheextentwherethegeometrycouldbecreatedmanuallyinFLOTHERM”,CanbedonefromDecomposeoraloneusingTools/GlobalSimplifyOrrightclickontheselectedobjectandgotoGlobalSimplifyWorksonselectedMCADpartorbodyEasywaytoquicklyperformthermalsimplifications,GlobalSimplification,SmallHoleToleranceTolerancesizeisthepercentageoftheoriginalMCADBodyvolumeSmallHumpToleranceTolerancesizeisthepercentageoftheoriginalMCADBodyvolumeSmallFacesToleranceTolerancesizeisthepercentageoftheboundingboxvolumeofeitherasingleorpairofneighboringfacestothevolumeoftheMCADBodySmallDraftAngleToleranceangleoftheslopeNearLevelToleranceTolerancelengthisthepercentageofthelengthofthediagonaloftheboundingboxoftheMCADBodyvolume,GlobalSimplification,SeeingwhathasjustbeensimplifiedAfteraglobalsimplifyitissometimesnotclearexactlyhowthegeometryhasbeensimplifiedCntrl-U(Edit/Undo)isgoodfortogglingbetweenbeforeandaftersimplification,LocalSimplification,Tools/LocalSimplifyOrrightclickontheselectedobjectandgotoLocalSimplifyTotalcontroloverwhatissimplifiedtowhatextentcanbeachievedbyperforminglocalsimplificationsTargetsspecificareasforsimplificationManuallyintensiveHotKeysusedinconjunctionwithselectedgeometryto:+Addboundingbox-SubtractboundingboxdeleteRemovefFlattenlLevel,AddBoundBoxActivewhenfacesorfeaturesareselected.Itaddstheboundingboxofeithertheselectedfacesorofeachoftheselectedfeatures,totheowningMCADBody.SubtractBoundBoxActivewhenfacesorfeaturesareselected.Itremovestheboundingboxofeithertheselectedfaces,orofeachoftheselectedfeatures,fromtheowningMCADBody.RemoveActivewhenfacesorfeaturesareselected.Itremovestheselectedfaceorfeature.FlattenActivewhenfacesareselected.Itflattenseachoftheselectedfaces.LevelActivewhentwoormorefacesareselected.Itlevelsallselectedfacestothatofthefirstselected.Mark/UnmarkMarkmarkstheselectednon-planarfacessotheyareignoredbytheglobalsimplificationprocess,i.e.theprogramdoesnotattempttoremovethemwhenremovingnon-planarfacesinTools/GlobalSimplify.UnMarkreversestheMarkcommandsothattheselectedfaceisincludedinthesimplificationprocess.,LocalSimplification,FeatureSimplificationAfeatureisasmallcollectionoffacesthattogetherconstituteageometricpatternFeaturesarederivedbyFLO/MCADfromthetopologyofneighbouringfacesFeaturescanberemoveduponselection,DataSimplification,Whatdothe.(dots)mean?EachdotrepresentsasuccessfullycompletedsimplificationoperationWhatdotheFsmean?FailureofasinglesimplificationoperationNormallyaccompaniedbyanACISmodelerrorinthemessagewindowDueto(inorderofprobability):ToocoarseatoleranceInherentfailureofthesimplificationalgorithmNon-manifoldobject,Simplifyingthegeometry,Example:removelittleholes,Flothermtranslation,SelecttheCADparttobetranslatedSelecttheobjecttobetranslatedto,TransfertoFlotherm,Click,Allthetransformedobjectswillbetransferred,WhenaMCADpartisreplacedwithaFLOTHERMSmartPartitdoesnothaveanyboundaryconditiondefinedForexample,theholepatternandsizestillneedtobedefinedfortheperforatedplatePCBisanexceptionsinceitiscreatedwithFR4andCopperattached,assuming10%conductorbyvolume,DataConversion,Example:Bounding,averagedorelse?,Example:Bounding,averagedorelse?,Keepthedimension:usefulwhenencumbrancesareimportant(forexamplefluidflowobstruction)Keepthevolume:whenmassisimportant(forexampletransientanalysis),Perforatedplates,SelectthetwocornerholesSubstitutewithperforatedplatessingleobject,Decomposeobject,Complexgeometriescannotbesubstitutedwithasingleobject(ex.Boundingcuboid)Needtodecomposeinmoreparts,Selectobject,Setthecomplexityandtheobjectemployed,ObtainthedecomposedobjectreadytobetransferredinFlotherm,Dissection,DissectionistheprocessofconvertingthecurrentMCADobjectintoacollectionofFLOTHERMprimitivesTheconversioninvolvessubdividing(slicingandsplitting)theobjectintosmallerandsmallerchunks(MCADbodies)TheseMCADbodiesarereplacedbyFLOTHERMprimitivesDissectionispartofDecomposeorcanbedonebyitself,Dissection,AutomaticdissectionisdoneusingTools/DissectBodyTheMCADobjectisautomaticallyandsuccessivelysplitintoacollectionofsmallerMCADbodiesThesesmallbodiesarethenconstantlyanalyzedtoseeiftheyaresimilarenoughsoastobereplacedwithPrismsand/orCuboids,SlopingBlocksorCylinders,Dissection,Ifthegeometryhasbeensufficientlysimplified,automaticdissectionwithdefaultsettingswillbeproblemfreeLeavethefirst3settingsatdefaultNearlyalwaysnoneedtomodifyifthegeometryisalreadysimplified,Arc/ChordRatioisusedtodeterminehowanMCADbodywithacurvedfaceissplitintosmallerbodiesThecloserA/Cisto1.0thebetterthecurvewillberesolvedIf1.1istoocoarsetry1.05,1.025or1.01Onlyusediftherearecurvedfacesinthemodel,Dissection,MinimumVolumeTolerancePercentageofvolumeofnewMCADbodytooriginalMCADbody.BodiesbelowminvolumetoleranceareremovedifConserveVolumeisswitchedoff.OtherwisetheyarereplacedwithanaverageCuboid.Empty/FullBodyTolerancePercentageofvolumeofMCADbodytothevolumeofitsboundingbox.MCADbodyFullBodyTolerance:ReplacedbyCuboidprimitive.,Dissection,LotsandLotsofDots?EachtimeadotappearsthebodyhasbeensplitintosmallerbodiesIfmanymanydotsappearthisindicatesoriginalcomplexityItmaybeadvisabletointerrupt,simplifythenre-dissect,Voxelize,Verycomplexobjectcannotbedecomposedefficiently(ex.Carvedsurfaced)Difficulttosplitthegeometryinmanysub-objectsVoxelizationcreatesanarrayofcuboidstorepresentthegeometrywithauser-definedstepsize,Voxelization,VoxelizationistheconversionofageometricalmodeltoavolumetricmodelRootsinthecomputergraphicsindustry,Voxelization&Flotherm,FLO/MCADcanvoxelizeanyCADpartintoanarrayofCuboidsUsercontrolshowmanyCuboidsarecreatedApplyVoxelizationwhenCADgeometryistoocomplexandTool/SingleObjectorTools/Decomposecannotbeused,CADTool,VoxelizedGeometry,FLO/MCAD,UseTool/VoxelizeorclickwithaPartorBodyselectedChooseeitherMinimumNumberorMaximumCellSizeandentervaluesfortheX,Y,&ZdirectionsAminimumcellsizemustalsobeentered,VoxelizationInputs,Voxelization,HowvoxelizationworksAbasevoxelgridisconstructedacrosstheselectedpartorbodyusingitsboundingboxandallofitsverticesTheremainderofthevoxelgridisderivedfromtheusersinputIfthereissolidCADm