Engineering - Engineering Design and Analysis - Lecture Slides, Slides of Computer-Aided Design for Engineers

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Engineering

Design Cycle

PreReq  Identify an Opportunity

• Idea emerges for an Engineered Product that

will likely produce a minimum Return on

Investment (RoI)

• Described, at a minimum, by a list of

Functional Requirements (FR’s)

• Technical Function

and Performance

• Production Cost Target
• Production Time Target

• BrainStorm Concepts
  • Preliminary: Analyze/Rank Concepts
    • Technical Risk/Feasibility
      • Search for “Fatal Flaws”
    • Schedule Risk/Feasibility
    • Cost Risk/Feasibility
  • Final: Evaluate most promising (no more than

3) Concepts

• Detailed Calculations and/or Computer Models
• SubScale Physical Testing
• Cost & Schedule Comparisons
• Select: Determine “best” Concept

• Conceptual Design
  • Explanation of HOW design MEETS the FR’s
    • Describe “Theory of Operation”
  • Form and Fit (LayOut Drawings)
  • Control System Schematics; e.g., Electrical,

Plumbing, Optical, Ventilation, etc.

• Identify & Describe System-Control Elements and the associated I/O points
• Identify Suppliers for Critical Components

• CONCEPTUAL DESIGN REVIEW
  • CDR Presentation content details
    • Define overall design constraints and requirements.
    • Describe concept(s) in detail, their features, tradeoffs, and how they will address the performance, cost, schedule, and customer requirements.
    • Define the top 3 reliability risks and how they will be mitigated
    • Show any test data obtained to date.

• CONCEPTUAL DESIGN REVIEW
  • CDR Presentation content details
    • Show key project milestones and decisions to be made between now and start of build.
    • COST REVIEW: Specific breakdown of cost estimates, including cost data sources
• Detail Design
  • Fabricated-Part Drawings (BluePrints)
    • Material Selection
    • Material Processing/Finish
    • Tolerances and other inspection-criteria

• Detail Design
  • Detailed Control-System Schematics
    • Listing of I/O points
    • Describe Function of Each I/O point
• CRITICAL DESIGN REVIEW
  • Test Data Supporting the Concept
    • C&F data presented where applicable or available
  • Design Presentation: How it meets subsystem

and system requirements

• Describe design, including performance and operation, critical design or build areas, how the design meets subsystem criteria

• CRITICAL DESIGN REVIEW
  • Functional Engineering BoM, ready for

prototype release

• Complete & Accurate BoM using Organization- Standard Format
• BoM Cost estimate for production build
• Purchasing quotes for "Big Hitter" items; std Company DataBase costs, Supplier quotes, published Catalog-Costs, educated estimates for other items

• CRITICAL DESIGN REVIEW
  • Listing of manufacturing risks
    • Simple statements of risks
  • Identification of manufacturing strategy: Make

Buy, etc.

• Simple statement attached to BoM components
• Identification of supplier strategy: How/Who

will supply components

• Simple vendor ID attached to BoM components

• CRITICAL DESIGN REVIEW
  • Identification of inspection strategy: Supplier

or Company inspection,

critical areas

• Simple statement of who is responsible for inspection of which critical parts
• Inputs from Safety Engineering to assure

compliance with Human-Safety and

Ergonomics Standards (UL, CE, NEC, SEMI S2,

ASME Pressure-Vessel Code, ANSI Z136 Lasers,

etc.)

• CRITICAL DESIGN REVIEW
  • SubSystem Test Plans
    • Any level of subsystem test plan or subsystem test criteria is acceptable
  • Schedule for Open Items
    • Provide schedule for completion of any open CrDR deliverables

• ProtoType Construction & Testing
  • Built to CrDR BluePrints and Specifications;

Iterate-on

• Accuracy/Correctness of Documentation
• Fabrication, Inspection, Assembly Process Improvements
• Test & Iterate-on
• Function
• Performance
• Reliability
• SubSystem Testing

• Final Design
  • Finalized
    • Test Procedures
    • Inspection Documents
  • First Cut Instruction Manuals
    • Installation
    • Operation
    • Maintenance
      • Recommended Customer-Site Spare Parts

All Done for Today

Engineering

Design

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