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Representing Geometry (CAD) information in dynamic (Modelica) models

MSDL August 29 th , 2009. Representing Geometry (CAD) information in dynamic (Modelica) models. By Chah é Adourian. Outline. Introduction Intro to Block Diagrams (BD) Intro to CAD Assemblies Comparison BD - CAD Mapping CAD to BD Automating the process Example Conversion Conclusion

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Representing Geometry (CAD) information in dynamic (Modelica) models

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  1. MSDL August 29th, 2009 RepresentingGeometry (CAD) information in dynamic (Modelica) models By Chahé Adourian

  2. Outline • Introduction • Intro to Block Diagrams (BD) • Intro to CAD Assemblies • Comparison BD - CAD • Mapping CAD to BD • Automating the process • Example Conversion • Conclusion • Future Work

  3. Introduction • Map CAD Assembly to Block Diagrams

  4. Introduction • Objectives • Provide simple mapping CAD  BD • Preserve mechanical/geometric constraints • Simulate mechanical behavior in BD model; • Ex. A CAD Model of Robot converted to BD for simulation of robot dynamics

  5. Intro - Block Diagrams • Blocks + Connections • Finite Connection points (1 or 2 per block) • Block Parameters • Ex.

  6. Intro - CAD Assembly • Part and geometry • Assemblies and geometric relations • Example Geometric relations • Infinite connection points

  7. Intro - CAD Assembly • Part and geometry

  8. Intro - CAD Assembly • Assembly example with geometric constraints between the parts

  9. Intro - CAD Assembly • Ex #1: Planar Mate Geometric Relation • Before and after application

  10. Intro - CAD Assembly • Ex #2: Axial Align Geometric Relation • Before and after application

  11. Intro - CAD Assembly • Infinite number of connection points • Ex. Planar Mate

  12. Comparison BD – CAD • Block diagram is abstract • CAD is geometry information rich • Block diagram provides finite connections • CAD geometry provides infinite connections points

  13. Mapping CAD to BD • Mapping CAD Part to BD Block

  14. Mapping CAD to BD • CAD versus BD Geometries Cylinder Line Point Face

  15. Mapping CAD to BD • Mapping the infinite geometric choices using Mathematical constraints • Ex. Mapping Mate Relation to equations

  16. Mapping CAD to BD • Equations Stored in BD

  17. Mapping CAD to BD • Partial list of BD Assembly Relations

  18. Automating the Process • Convert CAD Assembly to BD assembly automatically • Extract CAD Part Geometry Information • Extract CAD Assembly Information • Example Conversion

  19. Automating the Process • Example CAD Part Geometry Information

  20. Automating the Process • Example CAD Assembly Information

  21. Example Conversion

  22. Conclusion • CAD Mechanical Assembly information converted to BD form • Equivalents for CAD parts, geometries and assembly relations created • CAD to BD Mapping 1-1 • Simple Mapping allows BD user to influence CAD model

  23. Future Work • Complete bi-directional model synchronization algorithm (BD->CAD, CAD->BD) • Demonstrate BD influence on CAD model development

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