cad model verification, validation and comparisonedge.cs.drexel.edu/ltkr/nist ltkr mar 2006 iti cad...
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Raising the Value of your
Product Data
CAD Model Verification, Validation and Comparison
Doug CheneyCAD Interoperability Consultant
CADIQ Product Manager513-576-3825
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International TechneGroup Inc. (ITI)
BackgroundFounded in 1983by Dr. Jason LemonPrivately HeldHeadquarters - Cincinnati, OH
Global PresenceNorth AmericaEuropeAsia Pacific
Business OfferingsEngineering Process Improvement Consulting (CP/PDTM)Analysis, Simulation, Test, and Reliability Engineering ServicesProduct Data Integration & Interoperability (TranscenData Business)
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ITI TranscenData Business Focus
Engineering is hard . . .
Sharing your product data should be easy!
Solution SetCAD & PLM IntegrationPLM & ERP IntegrationCAD Model Quality, Translation & Distribution
ERPPLM
CAD/CAM/C
AE
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ITI TranscenData History
Mid 80s Early 90s Late 90s Today
IGES Translator DevelopmentVendor/OEM ProgramsIGES Standard Development EffortIGESworks
STEP Translator DevelopmentVendor/OEM ProgramsSTEP/PDES Inc. Development Effort
Quality Testing and RepairAcquired FEGS Ltd. with CADfixCADIQ
Automation & ComparisonDEXcenterCADIQ V4
PDM Systems IntegrationVendor/OEM ProgramsPDM/CAD & PDM/ERP
CAD & P
DM
Integrat
ionPDM & ERP
Integration
CAD/CAM/CAE
Interoperability
Engineerin
g
Supply Chain
Data Exc
hange
ProductData
ProductData
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CADIQ Product OverviewNative CAD Interfaces (API)
CATIA V4 and V5, I-deas, Pro/E, SolidWorks, UnigraphicsParasolid, STEP and IGES
Specialized User InterfaceMulti-CAD, multi-platform batch analysis with statisticsRapid graphical viewing of diagnostic feedbackSide-by-side viewing of 2, 3 or 4 equivalent models
Model Quality DiagnosticsInvalid geometryUnrealistic/ambiguous features
Model Comparison DiagnosticsUnacceptable changes after translationUndocumented changes between revisionsUnintentional changes between revisions
System Integration OptionsEmbedded CAD utilityDEXcenterPDM Workflow
Compare CAD models
CheckCAD Models
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CADIQ Software ArchitectureSampling points are evaluated by the native CAD systemOnly topology & sampling points are translated by CADIQ between the CAD systemsPoint projections are performed by the target CAD systemQuality analysis is performed on each model in its own CAD system
CADIQViewer
CADFile ACAD
File A
Translate/Migrate/
Remaster
Translate/Migrate/
RemasterCAD
File BCAD
File B
CADIQFile B
CAD Session ACADIQFile A
CADIQ Analyzer
CAD ModelerCAD Modeler
CAD APICAD API
CAD Session BCADIQ Analyzer
CAD ModelerCAD Modeler
CAD APICAD API
CADIQController
Launches &monitors
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Design Verification for Simulation:Unrealistic Blend
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Design Verification for Simulation:Crack Between Rib and Body
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Diagnostic Correlation Statistics
Identify good (OK) and bad (NOK) models for a specific downstream processDetermine which diagnostics are significant
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Quality Control Statistics
Classify a model for downstream reuse“Concept model” vs. “Engineering model”
Summarize the quality of the CAD models for a specific design project
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Quality Control Statistics (cont)
Track the quality of the models in a project over timeSeverity: Defect, Warning or Clean (for downstream reuse)Type: Parametric or Explicit (no features/history)
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Expanding the Definition of “Bad CAD” Invalid geometry (Verification)
Impedes reuse of native model in most CAx processes
Unrealistic features (Verification)Require geometry changes during CAE/CAM model reuseCan cause divergence between CAE and CAM models
Unacceptable changes (Validation)Introduced during translation, migration, remastering or archivingIntroduced during rework for CAE/CAM reuse
Undocumented changes (Comparison)Between design revisions or for an engineering change order
Unintentional changes (Comparison)Between design revisions or for an engineering change orderCaused by complex parametric relationships unknown to user
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Direct Translation Validation:Shape Change in Complex Blends
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Feature Translation Validation:Feature Dropped with No Error in Process
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STEP Translation Validation:Surface Approx. Creates Open Solid
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Comparing Part Revisions
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Comparing Part Revisions:Fillet Radius Increased
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Comparing Part Revisions:Small Feature Suppressed
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Comparing Part Revisions:Hole Diameter Increased
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Design Verification for Simulation/Tooling
Compare
Validate
Design
Simulation
MajorDefects
UnacceptableShape orQualityChangesMinor
Defects
Verify
ShapeChanges
NewRevisionPrevious
Revision
CAE Support
Repair
Simulation not needed
No ShapeChanges
No Defects
No Changes
“Minimize CAD rework for simulation.”
CADIQ Functions
CAD Support
CADfix Functions
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Translation Validation
Verify native model for downstream reuseValidate that translated model has equivalent quality and shapeIdentify process issues for Support to resolve
“Quickly identify and resolve translation process problems.”
CADIQ Functions
Validate
Design Deliver
Verify
DX Support
TranslatePass Pass
FailFail
Compare
CAD Support
“Document geometric changes since the previous translation.”
DesignNewRevision
PreviousRevision
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Validation for Long-term Preservation
Verify native model for downstream reuseValidate that STEP export has equivalent quality and shapeValidate that STEP import has equivalent quality and shape
Validate
Design
Release
Verify
Support
ExportPass
Fail Archive
ImportValidate
Fail
Pass
“Your long-term revenue is dependent on long-term preservation of your digital data.”
CADIQ Functions
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Proprietary vs. STEP-Based Validation
CADFile ACADFile A
Translation, Migration,Remastering or
Archival
Translation, Migration,Remastering or
ArchivalCADFile BCADFile B
CAD Session ACADIQ
FileCADIQ Analyzer
CAD Session B
CADIQ Analyzer
Current proprietary solution
CAD Session ASTEP VP
& PDQ FileSTEP VP
& PDQ FileCADIQ Analyzer
CAD Session B
TBD Analyzer
Potential STEP-based solution
10 to 70 years
“Create a self-validating STEP archive model.”
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New STEP Development Activities
CAx-IF Validation Properties Recommended PracticesExtend STEP to capture native validation propertiesDeveloped in 1998 by CAx Implementers Forum (mass props only)Supported by most STEP translation vendorsExtended in 2001 to include assembly part/instance mass propsSupported by a few STEP translation vendors2nd extension proposal being developed to add face sampling points
ISO 10303 Part 59 “Quality of Product Shape Data”Extend STEP to capture native geometric quality dataBased on SASIG (VDA, JAMA/JAPIA, AIAG) PDQ specificationProposed by Japan at fall 2004 ISO meetingWorking draft delivered at fall 2005 ISO meetingTargeting completion in fall 2006 for AP203 Edition 2
PDES, Inc.
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Raisingthe Value of your
Product Data
Maximize CADModel Re-use
Facilitate GlobalProduct
Development
Enable EngineeringSupply Chain
Data Exchange
Ensure CADModel Quality
Product Data Integration & Interoperability Solutions
www.transcendata.com