1、CharacterizingFine-GrainedAssociativityGaps:APreliminaryStudyofCAD-CAEModelInteroperability,Russell.P//projects/,2003AerospaceProductDataExchange(APDE)WorkshopApril7-9,2003NISTGaithersburg,Maryland,Afullreportversionisavailablehere

2、:/pubs/reports/EL004/,AbstractConferenceSeriesArchive:/,CharacterizingFine-GrainedAssociativityGaps:APreliminaryStudyofCAD-CAEModelInteroperabilityThispresentationdescribesaninitialstudytowardscharacterizingmodelassociativitygapsandotherengineeringinteropera

3、bilityproblems.DrawingonoveradecadeofX-analysisintegration(XAI)researchanddevelopment,itusestheXAImulti-representationarchitecture(MRA)asameanstodecomposetheproblemandguideidentificationofpotentialkeymetrics.Afewsuchmetricsarehighlightedfromtheaerospaceindustry.Theseincludenumberofstructuralanalysis

4、users,numberofanalysistemplates,andidentificationofcomputingenvironmentcomponents(e.g.,numberofCADandCAEtoolsusedinanexampleaerospaceelectronicsdesignenvironment).Oneproblem,denotedthefine-grainedassociativitygap,ishighlightedinparticular.TodaysuchagapintheCAD-CAEarenatypicallyrequiresmanualeffortto

5、connectanattributeinadesignmodel(CAD)withattributesinoneofitsanalysismodels(CAE).Thisstudyestimatesthat1millionsuchgapsexistinthestructuralanalysisofacomplexproductlikeanairframe.Thelaborcostalonetomanuallymaintainsuchgapslikelyrunsinthetensofmillionsofdollars.Otherassociativitygapcostshaveyettobees

6、timated,includingover-andunder-design,lackofknowledgecapture,andinconsistencies.Narrowinginonfundamentalgapslikefine-grainedassociativityhelpsbothtocharacterizethecostoftodaysproblemsandtoidentifybasicsolutionneeds.Otherstudiesarerecommendedtoexploresuchfacetsfurther.Afullreportversionisavailableher

7、e:/pubs/reports/EL004/,X=design,mfg.,sustainment,andotherlifecyclephases.,ModelInteroperabilityChallenges:HeterogeneousTransformations,HeterogeneousTransformation,HomogeneousTransformation,DesignModelA,DesignModelB,DesignModelA,AnalysisModelA,Analogy:Bottom-UpBudgetEstimation,

8、Goal:ConceptualFrameworkforComplexModelInteroperabilityCharacterizationJPL/NASA)ChipPackageThermalAnalysis(Shinko)SummaryPart4:AdvancedTopicsIdealizedGeometriesofVaryingDimension,inboardbeam,DesignModel(MCAD),AnalysisModels(MCAE),1DBeam/StickModel,3DContinuum/BrickModel,flapsupportassembly,Behavior=

9、Deformation,FlapLinkGeometricModel(withidealizations),28b,FlapLinkageExampleManufacturableProductModel(MPM)=DesignDescription,ExtendedConstraintGraph,ConstrainedObject(COB)Structure(template),FlapLinkageExampleAnalyzableProductModel(APM)=MPMSubset+Idealizations,ExtendedConstraintGraph,PartialCOBStru

10、cture(COS),effective_length,Leff=inter_axis_length-(sleeve1.hole.cross_section.radius+sleeve2.hole.cross_section.radius),ConcurrentMulti-FidelityCross-SectionRepresentations,MULTI_LEVEL_COBcross_section;design:filleted_tapered_I_section;tapered:tapered_I_section;basic:basic_I_section;RELATIONSPRODUC

11、T_IDEALIZATION_RELATIONSpir8:=;pir9:=;pir10:=;pir11:=;pir12:=;pir13:=;pir14:=;pir15:=;pir16:=;pir17:=;END_MULTI_LEVEL_COB;,DetailedDesignCross-Section,IdealizedCross-Sections,AssociativityRelationsbetweenCross-SectionFidelities,DesignModel,IdealizedModel,Design-IdealizationRelation,FlapLinkAPMImplem

12、entationinCATIAv5,Multi-RepresentationArchitectureforDesign-AnalysisIntegration,O(100)types,AnalysisBuildingBlocks(ABBs),AnalysisPrimitives,Beam,DistributedLoad,Rigid,Support,CantileverBeamSystem,AnalysisSystems,-Primitivebuildingblocks,-ContainersofABBassemblies,MaterialModels,Specialized,General,-

13、Predefinedtemplates,-User-definedsystems,AnalysisVariables,DiscreteElements,Interconnections,Continua,PlaneStrainBody,Linear-,Elastic,Bilinear,Plastic,Plate,LowCycle,Fatigue,Mass,Spring,Damper,No-Slip,Temperature,Stress,Strain,s,e,T,Geometry,Objectrepresentationofproduct-independentanalyticalenginee

14、ringconcepts,CommonStructuresWorkstation(CSW)RequestforInformationJune2000,TheBoeingCompany.AppendixB:RequiredStandardAnalysisMethods,Availableat/projects/boeing-psi/2000-06-csw-rfi/,110generictemplategroupings,AppendixB:RequiredStandardAnalysisMethods(continued),COB-basedLibr

15、ariesofAnalysisBuildingBlocks(ABBs)MaterialModelandContinuumABBs-ConstraintSchematic-S,MaterialModelABB,ContinuumABBs,modularre-usage,TorsionalRod,ExtensionalRod,1DLinearElasticModel,COB-basedLibrariesofAnalysisBuildingBlocks(ABBs)MaterialModelandContinuumABBs-COBStructure-S,COBone_D_linear_elastic_

16、modelSUBTYPE_OFelastic_model;youngs_modulus,E:REAL;poissons_ratio,:REAL;cte,:REAL;shear_modulus,G:REAL;strain,:REAL;stress,:REAL;shear_stress,:REAL;shear_strain,:REAL;thermal_strain,t:REAL;elastic_strain,e:REAL;temperature_change,T:REAL;RELATIONSr1:*(2*(1+)=;r2:=+;r3:=/;r4:=*;r5:=/;END_COB;COBone_D_

17、linear_elastic_model_isothermalSUBTYPE_OFone_D_linear_elastic_model;RELATIONSr6:=0;END_COB;,COBslender_bodySUBTYPE_OFdeformable_body;undeformed_length,L0:REAL;reference_temperature,T0:REAL;temperature,T:REAL;RELATIONSsb1:=-;END_COB;COBextensional_rodSUBTYPE_OFslender_body;start,x1:REAL;end,x2:REAL;l

18、ength,L:REAL;total_elongation,AppendixB:RequiredStandardAnalysisMethods(continued),Multi-RepresentationArchitectureforDesign-AnalysisIntegration,O(10,000),COB-basedConstraintSchematicforMulti-FidelityCAD-CAEInteroperabilityFlapLinkBenchmarkExample,(1a)AnalysisTemplate:FlapLinkExtensionalModel,Tutori

19、alExample:FlapLinkAnalysisTemplate(CBAM),FEA-basedAnalysisSubsystemUsedinLinkagePlaneStressModel(2DAnalysisProblem),Higherfidelityversionvs.LinkageExtensionalModel,ABBSMM,SMMTemplate,FlapLinkExtensionalModel(CBAM)ExampleCOBInstanceinXaiTools(object-orientedspreadsheet),DetailedCADdatafromCATIA,Ideal

20、izedanalysisfeaturesinAPM,Explicitmulti-directionalassociativitybetweendesignUltimate/Shear,1.5D,Assembly:Ultimate/FailSafe/Fatigue*,*=Itemnotyetavailableintoolkit(allothershaveworkingexamples),FastenersDB,FASTDB-like,GeneralMathMathematicaIn-HouseCodes,ImageAPI(CATGEO);VBScript,“BikeFrame”BulkheadF

21、ittingAnalysisTemplateUsingConstrainedObject(COB)Knowledge/InfoRepresentation,18CAD-CAEassociativityrelations,CostofAssociativityGapsReference:/pubs/reports/EL004/,CategoriesofGapCostsAssociativitytime&labor-Manualmaintenance-Littlere-use-LostknowledgeInconsistenciesLimitedana

22、lysisusage-Fewerpartsanalyzed-Feweriterationsperpart“Wrong”values-Tooconservative:Extrapartcostsandperformanceinefficiencies-Tooloose:Re-work,failures,lawsuits,CostEstimateperComplexProductp.1/2ManualMaintenanceofAssociativityGapsinStructuralAnalysisProblems,Reference:/pubs/re

23、ports/EL004/,CostEstimateperComplexProductp.2/2ManualMaintenanceofAssociativityGapsinStructuralAnalysisProblems,Reference:/pubs/reports/EL004/,“BikeFrame”BulkheadFittingAnalysisTemplateUsingConstrainedObject(COB)Knowledge/InfoRepresentation,18associativityrelations,Contents,Ba

24、ckgroundExampleAirframeStructuralAnalysisNeeds(Boeing)ExampleCAD/E/XToolset(JPL)Multi-RepresentationArchitectureConceptualframeworkforcomplexmodelinteroperabilityQuantityestimatesbyrepresentationtypeCharacterizationofCAD-CAEAssociativityGapsSummary,ComplexSystemRepresentation&SimulationInteroperabil

25、ityBuildingEmergencyResponseScenarios(HomelandSecurity),Russell.P2003-02-28,CharacterizingComplexModelInteroperabilityUsingtheMulti-RepresentationArchitecture(MRA),MRA:Similarto“softwaredesignpatterns”forCAD-CAEdomainIdentifiespatternsbetweenCADandCAE(includingnewtypesofobjects)Cap

26、turesmulti-fidelityexplicitassociativityProvideshybridtop-down&bottom-upmethodologyforcharacterizingproblems&solutionsO(1,000,000)CAD-CAEgapestimate,ForFurtherInformation.,Contact:Russell.PWebsite:/Publications,projectoverviews,tools,etc.See:X-AnalysisIntegra

27、tion(XAI)Central/research/XAI_Central.docXaiToolshomepage:/tools/XaiTools/PilotcommercialESB:http:/www.u-,BackupSlides,ShortCourse:UsingStandards-basedEngineeringFrameworksforElectronicsProductDesignandLifeCycleSupport,ConstrainedObject(COB)Representatio

28、nCurrentTechnicalCapabilities-Generation2,Capabilities&features:Variousforms:computablelexicalforms,graphicalforms,etc.EnablesbothcomputerautomationandhumancomprehensionSub/supertypes,basicaggregates,multi-fidelityobjectsMulti-directionality(I/Ochanges)ReusesexternalprogramsaswhiteboxrelationsAdvanc

29、edassociativityaddedtoCOTSframeworks&wrappersAnalysismodule/templateapplications(XAI/MRA):AnalysistemplatelanguagesProductmodelidealizationsExplicitassociativityrelationswithdesignmodels&otheranalysesWhiteboxreuseofexistingtools(e.g.,FEA,in-housecodes)Reusable,adaptableanalysisbuildingblocksSynthesi

30、s(sizing)andverification(analysis),ConstrainedObjects(cont.)RepresentationCharacteristics&Advantages-Gen.2,OverallcharacteristicsDeclarativeknowledgerepresentation(non-causal)Combiningobject&constraintgraphtechniquesCOBs=(STEPEXPRESSsubset)+(constraintgraphconcepts&views)AdvantagesovertraditionalanalysisrepresentationsGreatersolutioncontrolRichersemantics(e.g.,equationswrappedinengineeringcontext)Unifiedviewsofdiversecapabilities(tool-independent)Ca