Parametric CAx Strategy

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Parametric CAx - Strategy

• ME 578
• Dr. C. Greg Jensen
• Assignment Find, copy, read and bring to next
  lecture class a Journal article that deals with
  Parametric Modeling

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Grand Vision

• Successful manufacturing companies are organizing
  themselves around the notion of product families

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Grand Vision

• They use parametric methods to digitally model
  their part and product families.

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Grand Vision

• Leverage discrete part or assembly models
• Through collaboration discrete models are widen
  (made more general), deepen (made more specific),
  and standardize throughout the corporation.
• Not a replacement to existing parametrics but an
  enhancement.

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ParaCAD Grand Vision
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ParaCAD Grand Vision

Parametric Routing Sheets
...
Parametric Components
Parametric Model
Optimizations Robust Design
Parametric Fixture Design
Parametric Analysis
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ParaCAD Grand Vision

Parametric Routing Sheets
...
Parametric Components
Parametric Model
Optimizations Robust Design
Parametric Fixture Design
Parametric Analysis
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Grand Vision

• Parametric CAx provides
• The ability to create robust product families
• The speed and power to do optimized product
  family customization
• The ability to expand into other markets and
  grow overall market share
• A framework for the enterprise and their value
  chain suppliers

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Costs

• Training
• Software Procurement
• Software Development
• Longer Setup Times
• Modeling
• Analysis
• Detailing
• Manufacturing
• Process Planning
• Costing
• Assembly
• Inspection

• Re-engineering the Organization
• Documentation
• Model and Process Certification
• Hardware Procurement

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Benefits Associated with ParaCAD

• Geometry in Seconds
• Concurrent Engineering
• Framework for Robust Design
• Framework for Optimization
• Basis for KBE
• Better Configuration Control

• Framework for Product Data Mining
• Engineering Artifacts are Automatic

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Estimating ParaCAD Costs/Benefits

• Discovery-driven planning (R. G. McGrath and I.C.
  MacMillan)
• Little is known and much is assumed
• Assumptions (best-guess estimates) must be tested
  and questioned
• Assumptions are systematically transformed to
  knowledge, and
• The real potential of the venture is discovered
  as the knowledge unfolds

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Estimating Cost/Benefit Ratio

• Discovery-driven planning (DDP)

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Estimating Cost/Benefit Ratio

• Reverse Benefits Statement

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Estimating Cost/Benefit Ratio
The goal is to determine the value of success
quickly.

• Reverse Benefits Statement

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Estimating Cost/Benefit Ratio

• Pro Forma Operation Specification

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Estimating Cost/Benefit Ratio
Identifying the Costs associated with parametrics

• Pro Forma Operation Specification

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Estimating Cost/Benefit Ratio

• Assumption Checklist
• 1. 25 preliminary design/analysis/manufacturing
  iterations
• 2. Time saved on each design/analysis/manufacturin
  g iteration will average 160 hours
• 3. Average labor rate is 50/hour
• .
• .
• .
• 21. Creation of parametric master model will take
  40 hours longer
• 22. Labor rate for a parametric modeler is
  60/hour
• 23. Creation of parametric analysis will take 60
  hours longer
• 24. Labor rate for a parametric analysis is
  100/hours
• .
• .
• .

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Estimating Cost/Benefit Ratio

• Assumption Checklist

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Estimating Cost/Benefit Ratio
Identifying implicit assumptions allows a
company to test their validity.

• Assumption Checklist

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Estimating Cost/Benefit Ratio
The parametric project begins based on the merits
of its business case

• Assumption Checklist

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Estimating ParaCAD Costs/Benefits

• Revised Reverse Benefit Statement
• With better knowledge the reverse cost/benefit
  statement is revisited and updated

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Estimating ParaCAD Costs/Benefits
Does the parametric project still make sense?

• Revised Reverse Benefit Statement
• With better knowledge the reverse cost/benefit
  statement is revisited and updated

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Estimating ParaCAD Costs/Benefits

• Test Assumptions at Milestones
• Parametric project schedules list all major
  activities
• Traditional milestones exist for all major events
• Superimposed on the project schedule are
  assumption milestones
• If the assumption is correct or reasonable it is
  deemed knowledge and the project continues, else
  one loops back to the beginning of DDP

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Estimating ParaCAD Costs/Benefits
Transforming assumptions to Knowledge.

• Test Assumptions at Milestones
• Parametric project schedules list all major
  activities
• Traditional milestones exist for all major events
• Superimposed on the project schedule are
  assumption milestones
• If the assumption is correct or reasonable it is
  deemed knowledge and the project continues, else
  one loops back to the beginning of DDP

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Benefits - Flat Belt and Sheave
Analysis Coupled Optimization
Geometry Coupled Optimization
Design Linkage
Simulation
First Principles
4Q00
2Q00
3Q00
4Q99
1Q00
2Q99
3Q99
1Q99
FEA Simulation 3 days/case workstation
Coupled Optimization 2 min/system
Parameter-Based Design 3 min/case
Empirical design-by-test
First Principles Model lt1 sec/case on PC