t & t top-down designdf.ppt
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Top-Down Design ToolsManaging Complex Assemblies
Victor RemmersHolland Engineering Consultants BV
Tips & Techniques
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2006 PTC2
Top-Down Design Philosophy
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2006 PTC3
Traditional Design Approach
Bottom-Up Design
Design of individual components independent of the assembly
Manual approach to ensure that components fit properly and meet the designcriteria
Components and those placed in sub-assemblies are brought together todevelop the top-level assembly
Errors are manually identified and modifications to each component are madeto make the adjustment. As assembly grows, detecting these inconsistenciesand correcting them can consume a considerable amount of time
Top LevelAssembly
ComponentDesign
Component
Design
Component
Design
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2006 PTC4
Possible example Bottom Up?
Mate
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2006 PTC5
Top-Down Design Philosophy
Top-Down Design
Method of placing critical information in a high-level location
Communicating that information to the lower levels of the product
structure
Capturing the overall design information in one centralized location
DesignInformation
Component Component Component
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A more integrated approach.
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2006 PTC7
Top Down Design Stages It is a concept.
6-Stage Process
1. Conceptual Engineering Phase
Layouts and Engineering Notebook
2. Preliminary Product Structure Phase
Pro/INTRALINK, Model Tree
3. Capturing Design Intent Phase
Skeleton Models
4. Manage Interdependencies Phase
Reference Viewer & Reference Graph
5. Communication of Design Intent Phase
Copy Geoms, Publish Geoms & Shrinkwrap
6. Population of the Assembly Phase
Automatic Component Constraints & Component Interfaces
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The Bobcat example
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Conceptual Engineering PhaseLayouts and Engineering Notebook
Understand Existing Situation
High-level Requirements
Space Allocation
Define New Space and Motion
2D Sketches
3D Models
Rapid Iteration & Convergence
Animations
Capture Key Design Intent
Parameters
Notes
Spreadsheets
Proprietary Data
Stage 1
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Preliminary Product Structure PhasePro/INTRALINK, Model Tree
Quickly define product hierarchy Before any of the components geometry is defined
Intuitive, automatic mapping to start models
Templates ensure all designs share the necessary commonelements such as layers, views & parameters
Foundation for efficient task distribution Assembly Population Environments
Pro/E menus and Model Tree pop-up menus
Pro/INTRALINK and PDMLink
Component Creation Methods
Empty Components; Copy from start models
Automatic assembly of default datums
Unplaced, Partially- & Over-Constrained Components
Stage 2
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Capturing Design Intent PhaseSkeleton Models
What needs to happen?
Capture conceptual design parameters within the contextof the assembly
Capture & control critical object interfaces in a single,convenient location
How? Skeleton Models
Centralized pathway for communication
Facilitate task distribution
Promote well-organized design environments
Enable faster, more efficient propagation of change
Special Treatment in BOMs, Simplified Reps, Drawings,Model Tree & Mass Property Calculations
Uniquely supported Scope Control Setting
Stage 3
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Manage Interdependencies PhaseReference Viewer & Reference Graph
Stage 4
Tools to Manage References
External Reference Control
Ensures Top-Down Design
methodology is followed
Incorporate design management rulesdirectly into the design
Ensures proper design reuse
Pro/INTRALINK
Model Tree Global Reference Viewer
Reference Graph
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Communication of Design Intent PhasePublish Geoms, Copy Geoms & Inheritance
Publish Geometry Features
Provides ability to pre-determine the geometry to be referenced by a CopyGeometry feature
Allows designers to define their interfaces to the rest of the design
Copy Geometry Features
Allows copying of all types of geometry
Surfaces, edges, curves, datums, quilts, copy/publish geometry
Retains copied geometry name and layer settings
Dependency on parent geometry can be toggled
Can be Externalized
External Copy Geometry
Build relationships on external models independent of an assembly
Useful for coordinate system assembly practices
Inheritance Inherit model geometry for one-way associativity
Shrinkwrap (included in Foundation Advantage Package)
Stage 5
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Population of the Assembly PhaseAutomatic Component Constraints & Component Interfaces
Stage 6
What tools are available for populating theassembly?
Assembly Tools
Drag & Drop Placement
Component Interfaces
Component Creation
Within the context of the assembly
Mirror Parts or Subassemblies
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How does Top Down Design relate to company goals?
Four Goals from Upper Management
1) Cycle Time Reduction.
2) Increase User Satisfaction with Software.
3) Margin Increase.
4) Cost Reduction.
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Why should you use it?
Benefits:
Reduced design time
Reduced errors (right the first time)
Increased quality
Better project management visibility
Concurrent engineering
Confidence in top-level regeneration
Knowledge of how modules interface
Top-level change control
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Example: to design an alternator...
What information should a designer need to work with most times?
Complete Top-Level
Assembly
540 MB
All Skeleton Modelsin Top-Level
Assembly
70 MB
Neighboring
Subassemblies
320MB
Subassembly,
with Skeleton Model containing
all required information ~ 20 MB
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What does an example look like?
Three PhasesPro/INTRALINK
Pro/CONCEPT
ISDX
Pro/ENGINEER
Pro/NOTEBOOK
CONCEPTUAL
DESIGN
CAPTURE DESIGN
CRITERIA
DETAILED DESIGN
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Product Definition
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Product Definition: Engineering Layout
What it is: First thing done in design cycle
What it is Not:
Used to evaluate key interface points
Used to evaluate key components of project
Three dimensional solids
Fully detailed
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Advantages of Using a Layout
Document design information in one centralized location
Document design information before creating solid models
Investigate design options without involving the entire assembly
Easily make design changes because all of the designinformation is contained in one location
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#2 Product Definition: Assembly Structure
What it is: Virtual Assembly / BOM
What it is Not:
Used to organize assembly & assigning of design tasks
Used to input non-geometrical data up-front
Three dimensional solids
Fully detailed
Fully constrained
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Advantages of Defining Preliminary Product Structure
Defining the product structure prior to defining geometry can assistyou in organizing the assembly into manageable tasks that can beassigned to design teams or individual designers.
Associate specific library parts (that are to be used on the project)with the assembly at the start of the design, preventing confusionlater.
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Advantages of Defining Preliminary Product Structure
Cont
Submit the assembly to Pro/INTRALINK or PDMLink and assignmodels to the appropriate vaults or folders.
Individual designers can focus on specific design tasks instead of onhow their design is going to fit into the overall structure.
Input non-geometrical information such as the part number,designers name, etc., at a very early stage.
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#3 Product Definition: Skeletons
What it is: Zero-mass geometry
What it is Not:
Exact location detail
Three dimensional solids
Fully detailed
Minimized geometric detail
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And Definitely Not This!!
http://www.promedproducts.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=PP&Product_Code=A10&Category_Code=AFhttp://www.promedproducts.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=PP&Product_Code=A10&Category_Code=AF -
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Advantages of Using Skeletons
Provides a centralized location for design data
Simplifies assembly creation / visualization
Aids in assembling mechanisms
Minimizes unwanted parent-child relationships
Allows you to assemble components in any order
Controls propagation of external references
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Central source for information
Benefits of Communicating Information From a Central Source
Task distribution
Concurrent Modeling
Managing External References
Tools
Declaration
Publish Geometry
Copy Geometry
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Hierarchy
Top_level.asm
Top_level_skeleton.prt
Sub_assy_1.asm
Sub_assy_1_skeleton.prt
Sub_assy_2.asm
Sub_assy_2_skeleton.prt
Sub_assy_x.asm
Sub_assy_x_skeleton.prt
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3D Design Finally!
The foundation is set but topologically modifiable its timefor 3D.
With Reference Control Manager, you are safe to create yourparts directly in the assembly.
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More Than Meets The Eye!
Interchangeability:
Family of Tables
Interchange Assembly
Layout Declarations
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Power of Top-Down Design
To Achieve Advanced Automation, consider using:
Relations
Pro/Program
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Miscellaneous Tips
Separate Part Versus Assembly for Skeleton Features
Avoid constructing assembly-level skeleton features since the systemrequires that you perform all edits of these features in Assembly mode.
The components can become an obstruction and degrade performance.
Furthermore, you cannot easily reuse skeleton features at the assemblylevel in other subassemblies. By using a separate part file, you can edit thefeature in Part Mode and reassemble it into many different assemblies.
Geometry Features
Place all static information in a skeleton as early as possible and placeall dynamic information later in the design process cycle.
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Miscellaneous Tips
Datums for Skeleton Models
Consider renaming skeleton datums to sk_
Visualization
Use simplified reps and transparency prolifically to make viewing easier
Use display states to highlight different items at different times
Use surfaces to clarify meaning of centerlines & axes
Conceptualization
Dont be afraid to use simple hand sketches before delving into complexsituations its NOT illegal
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Pro/E Wildfire EnhancementsHigh-performance Assembly Modeling
Lightweight Components
Represent common components with lightweightgraphics for optimum display speed
Accurate mass properties and BOMs
Customizable symbolic representations
Flexible Components
Represent multiple states of asingle component in an assembly
Addresses critical need for consistencybetween BOM and assembly model
Intelligent Regeneration
Assembly regeneration is up to 80% Faster!
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Highlights of Top-Down Design
Capture knowledge, or design intent, allowing you toconcentrate on significant issues by making the softwareperform tedious, repetitive calculations.
Enable the framework for interchangeability of componentsallowing for high-velocity product development by supportingrapid iterations of product variations.
Create a concurrent design environment by spreading projectdesign responsibility across many organizational levels.
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2006 PTC37
New in Advanced Assembly in Wildfire 3.0
Data Sharing Dashboard
The Data Sharing dashboard consolidates the Merge, Cutout, and Inheritance features ina modern user interface.
Enhancements to Data Sharing features in a new dashboard offer many benefits:
Allows changing of multiple feature types at any point
Offers a user-friendly user interface with easy access to commands
Supports object-action workflow for increased productivity
Consolidates Data Sharing features, such as Merge, Cutout, and Inheritance
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New in Advanced Assembly in Wildfire 3.0 (#2)
Top-Down Design with Mechanism Assemblies
You can now design a skeleton model that includes motion.
Motion skeletons are available in Assembly, allowing motion to be incorporated into the modelat the beginning of the design process. There is no longer a need to recreate an assembly toinclude a mechanism analysis.
You can create mechanism bodies and connections as a motion skeleton, then run a simplekinematic analysis to ensure that the skeleton provides the appropriate degrees of freedom.
You can then create and assemble components to the motion skeleton. Motion skeletons aredefined in the same way as normal assembly skeletons and include reference control settings.They do not appear in the assembly bill of materials.
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POWER OFTOP DOWNDESIGN!!!
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