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CAD/CAE Modeling

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Engineer friendly terms ( fillets, boss, slots etc.,) used in modeling/design workbench ... Geometric Modeling Features. Rules and Data for Features ... – PowerPoint PPT presentation

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Title: CAD/CAE Modeling


1
CAD/CAE Modeling
  • Parametric vs. Variational
  • Adaptive Modeling
  • Feature Based Modeling
  • Dynamic Modeling
  • Modelers use variable driven modeling vs.
    explicit modeling

2
Dynamic Vs. Static modeling
  • PTC introduced commercial version of variable
    modeling
  • Uses dimensions and constraints
  • Feature Based design
  • Uses primitives and parameters rather than
    coordinates and orientation
  • Features are directly placed in models

3
Modeling Modes
  • Issue How to capture/define parameters
  • Issue How to capture design intent and translate
    to variables
  • Issue After capture, how to maintain
    parameters/variables
  • Explicit modelers use geometry. Changes are
    expensive (time and effor)
  • Combines wires, sheets, solids

4
Variable Driven
  • Design intent is captured
  • Allows users to explore various design
    alternatives
  • Two popular sub-methods in use are parametric and
    variational modeling methodologies

5
Parametric Modelers
  • Transaction history is captured
  • Order dependent and hierarchical model creation (
    ordered steps to follow)
  • Solution speed is a great advantage to this
    method
  • Must FULLY constrain before next element is
    defined (every step)
  • DAG (Directed Acyclic Graph) modeling

6
Variational Modelers
  • Solves set of simultaneous equations
  • Driving dimensions can be based on complex
    equations Eg Dimensions based on material
    properties
  • No specific order dependency.
  • Constraints dimensional, geometric, algebraic
  • Eg Parallel lines A and B can both move

7
Adaptive Modelers
  • CSG tree based
  • Boolean operators
  • Parameters alter the CSG primitives
  • Euclid (MDV) used this method
  • Changes are still expensive due to boolean
    operator costs

8
Dynamic Modelers
  • Use Feature Recognition Technology
  • No prerequisite knowledge of models assumed
  • HP PE solid designer uses this method
  • No inter-relations available between features.
    This could be a limitation

9
Feature Based Modelers
  • Features are named entities which follow rules
  • Engineer friendly terms ( fillets, boss, slots
    etc.,) used in modeling/design workbench
  • Topological integrity must be maintained (
    through holes remain after higher thickness)
  • Follow rules. Process information is captured for
    manufacturing and applications

10
Sketches in Modeling
  • Contributes to how easy to edit and recreate
    designs
  • 2D-gt 3D can be done using extrude, revolve, sweep
    operations
  • Automatic parameterisation is more common in 2D.
    3D problem domain is much more complex

11
Geometric Modeling Features
  • Rules and Data for Features
  • Solid 3D models and features use DATUM feature in
    Pro/E
  • Changes and Edits are critical to evaluate for
    ease of use and speed
  • Variable Driven modeling is a must for all future
    systems

12
Advanced Modeling
  • Assembly models are collection of parts with
    position and orientation
  • Positional variables are used to relate parts
  • Stresses, Volumes, Geometric contraints are
    placed in assembly context
  • Tolerance Analysis application uses variables to
    help simulation/manufacturing
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