STEP and OMG Standards Interoperability

1
STEP and OMG Standards Interoperability

• Doug Cheney
• Senior Software Engineer
• International TechneGroup Incorporated

2
Engineering Data Producers and Consumers

• Producers Engineering Design Groups
• Consumers Partner Design Groups, Analysis,
  Manufacturing, Test, etc.

Technical Illustrator
Systems Engineer
Assembly
Print
CAD Model
Recreate
Wiring Engineer
Technical Illustrator
Translate
Design Engineer Using CAD System
Structural Engineer
Many Others...
3
Complimentary Interoperability Approaches

• Data integration Exchange product data via a
  neutral model representation
• Bottoms-up approach
• Neutral representation is a complete, standalone
  definition of model
• Requires two model conversions native to
  standard to target
• Native model is duplicated in standard and target
  system formats
• Systems integration Share product data via a
  neutral programming interface (API)
• Top-down approach
• Abstract representation exposes data and behavior
  needed by consumers
• Requires consumer access to licensed
  installations of producer systems
• Native model stays in native system

Native Model
Target Model
Neutral Model
Native Model
Target Model
4
Interoperability Approach Challenges

• Data integration
• Requires access to reliable translators
• Translations can cause significant delays
• Requires data rework when conversions are not
  100 successful
• Broad band width required for neutral model file
  transfer
• Loss of design intent information (construction
  history, features, parameters)
• Must manage redundant, derivative model
  representations
• Systems integration
• Requires application rework to use abstract
  interfaces
• Requires dynamic access to installed, licensed
  CAD and PDM systems
• Higher security risks

5
Complimentary Usage Scenarios

• Data integration
• Building a multi-disciplinary repository of all
  product data
• Long-term data retention
• Legacy data migration
• Loose partner/supplier integration
• Well-defined, structured and controlled design
  processes
• Systems integration
• Collaborative engineering
• Real-time, multi-system assembly design
• Tight partner/supplier integration
• Dynamic or evolving design processes

6
Complimentary Standards

• Data integration STEP AP 203
• PDM (Class 1)
• CAD shape representations (Classes 2 6)
• Systems integration OMG MfgDTF
• PDM Enablers
• CAD Services
• STEP influence on OMG standards
• Standardized definitions of geometry, B-Rep,
  assembly and PDM entities and relationships
• Concrete data format for serializing objects (via
  XML)
• Expect to incorporate construction
  history/parametrics model development

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OMG Manufacturing Domain Task Force

• Web site www.omg.org/homepages/mfg
• PDM Enablers
• V2 soon to be approved
• CAD Services
• Devt web site www.grc.nasa.gov/WWW/jcad
• V1 draft joint submission Dec 2000
• V1 workshop _at_ Boeing Feb 2001
• V1 submission June 2001
• V1 approval Dec 2001

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CAD Services V1

• Geometry and B-Rep traversals, evaluations, point
  projections, mass properties
• Non-geometric entity attributes (color, layer,
  visibility, user-defined attributes)
• Assembly structure and component placement
• CAD user interactions (primarily 3D graphics
  subsystem)
• Abstract feature properties, parameter queries
  and modifications, model regeneration

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CAD Services V2 (2002)

• PDM Enablers interoperability
• Explicit geometry and B-Rep creation
• Advanced visualization queries
• Geometric dimensioning and tolerancing queries
• Parametric/feature-based model creation

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System Integration Implementations

• CADScript is a commercial toolkit from ITI that
  enables system integrations (www.iti-oh.com/pdi)
• The following organizations are using CADScript
  for system integrations
• Webscope
• FIPER
• GE Aerospace
• Parker-Hannifin
• BF Goodrich
• OAI, ESI, Ohio Univ., Stanford Univ.
• NASA
• Goddard
• Glenn
• Details in tomorrows presentation!