Design Evaluation Methods
Design Evaluation Methods
Christopher Saldana, Ph.D.
Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta, Georgia USA
Learning Objectives
Understand the importance of evaluation in the design process Identify criteria for evaluation Utilize three levels of evaluation matrices for product development through concept screening and scoring Strategies for Visual/Descriptive Communication of Designs
2
Design Tools ? Current Progress
House of Quality
Problem Understanding
Specification Sheet
Function Tree
Place Mass on Target
Generate Power
Transmit Power
Hit Target
Brake on Target
Move to
Target
Navigate to
Target
Concept Generation
Morphological Chart
Design Alternatives
Generate Power
Gravity
Mouse Traps
Transmit Power
Car Hit by Trap
Rip Cord Effect
Ramp
Catapult
Brake on Target
Friction
String Break
Anchor
Rubber Stopper Weighted Skid
Move to Target
Rolling
Sliding
Projectile Launch
Navigate
to Target Equal Size Wheels Larger Front Wheels
33
Example: Insulin Pen
Redesigning the Insulin Pen
Customer Wants 1. Dose metering accuracy 2. Portability 3. Durability 4. Ease of handling 5. Readability of settings 6. Ease of use 7. Ease of manufacture
44
Example: Insulin Pen
Redesigning the Insulin Pen
55
Example: Insulin Pen
Redesigning the Insulin Pen
66
Structured Evaluation
Benefits
? Customer-focused product, competitive design ? Better product-process coordination, faster product introduction ? Effective group decision-making ? Documentation of design process
Challenge
? Need to make informed decisions despite lack of information ? Selection requires estimation, analysis, prototyping ? Identify bad concepts versus picking optimal ones
7
Structured Evaluation
How do we evaluate each of these designs? What criteria do we use for evaluation? What is the best design?
8
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