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Top Down Design[1]

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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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