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Top-Down Design ToolsManaging Complex Assemblies
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2006 PTC2
Top-Down Design Philosophy
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2006 PTC3
Traditional Design ApproachBottom-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 inconsistencies
and correcting them can consume a considerable amount of timeTop LevelTop LevelAssemblyAssembly
ComponentComponentDesignDesign
ComponentComponentDesignDesignComponent
ComponentDesignDesign
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2006 PTC4
Possible example Bottom Up?
Mate
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2006 PTC5
Top-Down Design PhilosophyTop-Down Design
Method of placing critical information in a high-level location
Communicating that information to the lower levels of the productstructure
Capturing the overall design information in one centralized location
DesignDesignInformationInformation
ComponentComponent ComponentComponent ComponentComponent
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2006 PTC6
A more integrated approach.
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2006 PTC7
Top Down Design Stages It is a concept.6-Stage Process
1. Conceptual Engineering PhaseLayouts and Engineering Notebook
2. Preliminary Product Structure PhasePro/INTRALINK, Model Tree
3. Capturing Design Intent PhaseSkeleton Models
4. Manage Interdependencies PhaseReference Viewer & Reference Graph
5. Communication of Design Intent PhaseCopy Geoms, Publish Geoms & Shrinkwrap
6. Population of the Assembly PhaseAutomatic Component Constraints & Component Interfaces
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2006 PTC8
The Bobcat example
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2006 PTC9
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 IntentParameters
Notes
Spreadsheets
Proprietary Data
Stage 1
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2006 PTC10
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 common
elements 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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2006 PTC11
Capturing Design Intent PhaseSkeleton Models
What needs to happen?
Capture conceptual design parameters within the context
of the assemblyCapture & 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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2006 PTC12
Manage Interdependencies PhaseReference Viewer & Reference Graph
Stage 4
Tools to Manage References
External Reference Control Ensures Top-Down Designmethodology 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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2006 PTC13
Communication of Design Intent PhasePublish Geoms, Copy Geoms & InheritancePublish 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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2006 PTC14
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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2006 PTC15
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.
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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2006 PTC16
Why should you use it?
Benefits:
Reduced design timeReduced errors (right the first time)
Increased quality
Better project management visibilityConcurrent engineering
Confidence in top-level regeneration
Knowledge of how modules interfaceTop-level change control
Benefits:
Reduced design timeReduced errors (right the first time)
Increased quality
Better project management visibilityConcurrent engineering
Confidence in top-level regeneration
Knowledge of how modules interfaceTop-level change control
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2006 PTC17
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
Subassemblies320MB
Subassembly,with Skeleton Model containing
all required information ~ 20 MB
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2006 PTC18
What does an example look like?Three Phases
Pro/INTRALINKPro/CONCEPTISDXPro/ENGINEERPro/NOTEBOOK
CONCEPTUALDESIGN
CAPTURE DESIGNCRITERIA
DETAILED DESIGN
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2006 PTC19
Product Definition
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2006 PTC20
Product Definition: Engineering LayoutWhat it is:
First thing done in design cycleFirst thing done in design cycle
What it is Not:What it is Not:
Used to evaluate key interface pointsUsed to evaluate key interface points
Used to evaluate key components of projectUsed to evaluate key components of project
Three dimensional solidsThree dimensional solids
Fully detailedFully detailed
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2006 PTC21
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
Is now very important for NiGEL, right now!!
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2006 PTC22
#2 Product Definition: Assembly StructureWhat it is:
Virtual Assembly / BOMVirtual Assembly / BOM
What it is Not:What it is Not:
Used to organize assembly & assigning of design tasksUsed to organize assembly & assigning of design tasks
Used to input non-geometrical data up-frontUsed to input non-geometrical data up-front
Three dimensional solidsThree dimensional solids
Fully detailedFully detailed
Fully constrainedFully constrained
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2006 PTC23
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 confusion
later.
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2006 PTC24
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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2006 PTC25
#3 Product Definition: Skeletons
What it is:Zero-mass geometryZero-mass geometry
What it is Not:What it is Not:
Exact location detailExact location detail
Three dimensional solidsThree dimensional solids
Fully detailedFully detailed
Minimized geometric detailMinimized geometric detail
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2006 PTC26
And Definitely Not This!!
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2006 PTC27
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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2006 PTC28
Central source for information
Benefits of Communicating Information From a Central Source
Task distribution
Concurrent Modeling
Managing External References
ToolsDeclaration
Publish Geometry
Copy Geometry
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2006 PTC29
HierarchyTop_level.asm
Top_level_skeleton.prt
Sub_assy_ 1 .asmSub_assy_ 1 _skeleton.prt
Sub_assy_ 2 .asmSub_assy_ 2 _skeleton.prt
Sub_assy_ x .asmSub_assy_ x _skeleton.prt
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2006 PTC30
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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2006 PTC31
More Than Meets The Eye!
Interchangeability:
Family of Tables
Interchange Assembly
Layout Declarations
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2006 PTC32
Power of Top-Down Design
To Achieve Advanced Automation, consider using:
Relations
Pro/Program
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2006 PTC33
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 assembly
level 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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2006 PTC34
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
ConceptualizationDont be afraid to use simple hand sketches before delving into complexsituations its NOT illegal
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2006 PTC35
Pro/E Wildfire EnhancementsHigh-performance Assembly Modeling
Lightweight Components
Represent common components with lightweight
graphics for optimum display speedAccurate mass properties and BOMs
Customizable symbolic representations
Flexible ComponentsRepresent 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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2006 PTC36
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 components
allowing 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 3.0Data 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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2006 PTC38
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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2006 PTC39
POWER OF
TOP DOWNDESIGN!!!
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2006 PTC40
The preliminary TDD for NiGEL
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