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Syde361 Concept Selection

Concept Selection
feasible concept designs 9
9

7

10

•

best alternative concept design

However:

e-“valu”-ate = values? whose?

Pugh’s EvaluationMethod
1. Select criteria, 2. Establish datum column, 3. Rate alternatives (+, -, S) against datum 4. Select best, or better alternatives

Modified Pugh’s Method

Add new column

Weightedrating method

best method

Concept Development Funnel

concept generation concept screening concept scoring concept testing

Concept Selection Process
• Prepare the Matrix
– Criteria –Reference Concept – Weightings

• Rate Concepts
– Scale (+ – 0) or (1–5) – Compare to Reference Concept or Values

• Rank Concepts
– Sum Weighted Scores

• Combine and Improve
– Remove Bad Features– Combine Good Qualities

• Select Best Concept
– May Be More than One – Beware of Average Concepts

• Reflect on the Process
– Continuous Improvement

Example: Concept Screening
CONCEPTVARIANTS SELECTION CRITERIA Ease of Handling Ease of Use Number Readability Dose Metering Load Handling Manufacturing Ease Portability PLUSES SAMES MINUSES NET RANK CONTINUE?

A
0 0 0 + 0 + + 3 4 0 3 1Yes

B
0 – 0 + 0 – + 2 3 2 0 3 Yes

C
– – + + 0 – – 2 1 4 –2 7 No

D
0 0 0 + 0 0 – 1 5 1 0 5 No

E
0 0 + + 0 0 0 2 5 0 2 2 Yes

F
– + 0 0 + – – 2 2 3 –1 6 No

G
– 0 + + 0 0 – 2 3 2 04 Yes

REF.
0 0 0 0 0 0 0

Example: Concept Scoring
Concepts A (reference) Master Cylinder Weighted Score 0.15 0.45 0.2 0.75 0.3 0.6 0.3 2.75 4 No DF Lever Stop Weighted Score 0.15 0.6 0.30.75 0.75 0.6 0.3 3.45 1 Develop E Swash Ring Weighted Score 0.2 0.6 0.5 0.5 0.6 0.4 0.3 3.10 2 No G+ Dial Screw+ Weighted Score 0.2 0.45 0.5 0.75 0.45 0.4 0.3 3.05 3 No

Selection Criteria Ease ofHandling Ease of Use Readability of Settings Dose Metering Accuracy Durability Ease of Manufacture Portability

Weight 5% 15% 10% 25% 15% 20% 10% Total Score Rank Continue?

Rating 3 3 2 3 2 3 3...