# CAD/CAE Modeling - PowerPoint PPT Presentation

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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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