Engineering is really all about problem solving. In product design, this means exploring, iterating, changing, testing, and changing again until an optimized solution is found, designed and built. To empower engineers and designers to be able to design truly innovative products, they need tools that are both flexible and powerful.
Parametric, feature-based 3D modeling tools provide engineers with a methodical, orderly and powerfully automated way to create complex models. These tools require engineers to anticipate and define feature constraints, relations and dependencies, which ensure that any design change will be reflected in all downstream geometry. Though powerful, these tools often make edits difficult, especially for those that didn¹t create the original model.
Direct modeling, on the other hand, enables users to take a more flexible, intuitive approach to creating geometry and doesn¹t carry the overhead of history-based dependencies. Users can directly manipulate model geometry without regard to how that geometry was created. To make changes, users simply grab, pull and drag geometry, making direct modeling an easier modeling paradigm to use.
Both approaches have their advantages and disadvantages. Each provides a different kind of value for each stage of development. In this webinar, our speakers will discuss how each modeling paradigm can be used in three phases of product development (concept development, simulation, detailed design).
3. Before We Start
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Q&A at the end of the presentation
Hashtag for this webinar: #DWwebinar
5. APPLICATION TO ACTIVITIES
• Designing Products
– Enabling the iteration
and exploration of
potential design
solutions
• Simulating a Product’s
Performance
– Abstracting and
simplifying a design in
preparation for
simulation
• Documenting Products
– Creating engineering
documentation for
downstream application
(manufacturing, quality
checking, etc.)
• Producing the Product
– Generation of
downstream tooling and
NC code to manufacture
the product
6. APPLICATIONS IN DIFFERENT STAGES
• Concept Design
– Prior to financial commitment,
either in the form of a
customer order or formal
internal funding
• Detailed Design
– After financial commitment,
but prior to design release
from engineering
• Manufacturing Prep and
Execution
– After design release and
before product shipment or
delivery
7. MODELING PARADIGMS: HISTORY-BASED
• Geometry built
progressively with
features (sketch-based,
edge based, etc.)
• Interdependencies built
up between features
• Build history of model is
preserved in a specific
order
• Changes enabled by
modifying existing
features
8. MODELING PARADIGMS: DIRECT
• Geometry selected,
then manipulated
• Selection or
manipulation not
constrained by how
the geometry was
created
• Build history of model
not preserved
• Can include parametric
modifications
9. ITS NOT JUST ABOUT 3D
• Sketching Tools
– Constraints enforce
properties like parallelism,
tangency and the like
– Constraints on an entire set
of 2D entities constantly
applied during changes
• Drafting Tools
– Properties applied at
creation, but not persisted
during changes
10. Concept Design:
Industry Trends and CAD
Development Impacts
Brian Thompson
Vice President, PTC Creo Product Management
February 2014
13. Concept Design CAD Implications
Concept Design
%
61 Design
Industrial
say concepts need to
be recreated for detailed design1
• Improved Industrial
Design Tools
– Better Efficiency
– Simpler Paradigm
• 100% Reuse of
Freeform surfaces
1
PTC survey of 7,000 manufacturing organizations, October, 2011
13
14. Concept Design CAD Implications
Concept Design
%
Industrial Design
• Improved Industrial
Design Tools
– Better Efficiency
– Simpler Paradigm
• 100% Reuse of
Freeform surfaces
1
65
2D Engineering
of new concepts
Design
are captured in 2D1
• Purpose Built 2D Design
Environment
• Collaborative Connection
with 3D
• 100% Reuse of 2D Concepts
PTC survey of 7,000 manufacturing organizations, October, 2011
14
15. Concept Design CAD Implications
Concept Design
Industrial Design
• Improved Industrial
Design Tools
– Better Efficiency
– Simpler Paradigm
• 100% Reuse of
Freeform surfaces
1
2D Engineering
Design
• Purpose Built 2D Design
Environment
• Collaborative Connection
with 3D
• 100% Reuse of 2D Concepts
PTC survey of 7,000 manufacturing organizations, October, 2011
%
68
3D leverage existing
Engineering
designs in Design
new concepts1
• Greater Design Flexibility
• Maintain Existing Design
Intent
• 3D Design Paradigm
Choice
15
16. Direct Modeling
A Clarification
• Direct Modeling = No History Tree = No Expensive Regeneration
• Direct interaction techniques that are NOT Direct Modeling
o Face Location Override (A “Move” Feature)
• The move is recorded as a new feature in the feature tree
• As more faces are moved, the tree becomes more and more complex
o Re-direction to Sketch
• The face finds it’s underlying sketch. The underlying sketch is modified and the
history tree re-generated from there down.
• Expensive in large models. Changes limited to original design intent.
17. Pros and Cons of History-based Modeling
History-based
Modeling
Highly
Automated
Requires
pre-planning
DimensionDriven
Inflexible
Scales poorly on
many-featured
parts
Featurebased
Indirect
Less Desirable
More Desirable
Less Desirable
18. Pros and Cons of History-free (Direct) Modeling
History-free
(Direct) Modeling
Scales
well
Flexible
editing
Direct
interaction
Less Desirable
More Desirable
Feature-less
Little design
automation
Weak
dimension-driven
editing
Less Desirable
19. Users Don’t Want to Have to Choose!
Incorporating the best of both worlds
Optimal
Solution
History-free
(Direct) Modeling
History-based
Modeling
Highly
Automated
Requires
pre-planning
DimensionDriven
Inflexible
Scales poorly on
many-featured
parts
Indirect
Less Desirable
Featurebased
Synchronized
Solve
Procedural
Features
Driving 3D
Dimensions
Scales
well
Flexible
editing
Direct
interaction
Feature-less
Little design
automation
Weak
dimension-driven
editing
More…
More Desirable
Less Desirable
20. Best Use of Technologies
Single, Seamless System
Optimal
Solution
History-based
Modeling
Castings
Plastic Parts
Surfacing
Stamped Parts
Machined
Massive
Parts
Assemblies
Straight Brake
Sheet Metal
Assembly
Productivity
21. Best Use of Technologies
Single, Seamless System
Optimal
Solution
Castings
Plastic Parts
Surfacing
Stamped Parts
Machined
Massive
Parts
Assemblies
Straight Brake
Sheet Metal
Assembly
Productivity
22. Questions?
Barb Schmitz
Chad Jackson
Design World
Lifecycle Insights
bschmitz@wtwhmedia.com
Phone: 440-937-4251
Twitter: @DW_BarbSchmitz
chad.jackson@lifecycleinsights.com
Phone: (512) 284-8080
Twitter: @chadjackson
Brian Thompson
Dan Staples
PTC
Siemens PLM Software
brthompson@ptc.com
Phone: 781-370-5583
dan.staples@siemens.com
Twitter: @danstaples
23. Thank You
This webinar will be available at
designworldonline.com & email
Tweet with hashtag #DWwebinar
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