Post on 16-Jan-2016
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TECHNIQUES FOR CONCEPT SELECTION
Feasibility
Judgment
Technology
Readiness Assessment
Go/no-go Screening
Decision Matrix Method
Numerous Concepts
Gut Feeling
State of Art
Customer Requirements
Absolute
Relative
Type of Comparison Technique Basis of Comparison
BEST CONCEPT
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EVALUATION BASED ON FEASIBILITY* JUDGMENT
What we think about it?
Understanding + Experience
* Feasibility: The quality of being doable
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EVALUATION BASED ON TECHNOLOGY READINESS ASSESSMENT
Objective - is to determine the readiness of the technologies that may be used in the design concept. Immature technology will lead to a poor-quality product or cancellation of a project due to cost overruns.
Time-Line for Technology Readiness
Technology Development Time
Powered human flight 403 (1500 – 1903)
Photographic cameras 112 (1727 – 1839)
Radio 35 (1867 – 1902)
Television 12 (1922 – 1934)
Radar 15 (1925 – 1940)
Xerography 17 (1938 – 1955)
Atomic bomb 6 (1939 – 1945)
Transistor 5 (1948 – 1953)
Digital camera 30 1965 - 2004
High temperature super conductor ? 1987 - ?
Electric car 1900 - ?
…..
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EVALUATION BASED ON TECHNOLOGY READINESS ASSESSMENT
Six measures to determine if a technology is mature:
1. Can the technology be manufactured with known processes?
2. Are the critical parameters that control the function identified ?
3. Are the safe operating parameters known ?
4. Have the failure modes been identified ?
5. Does hardware exist that demonstrates positive answers to the above four questions ?
6. Is the technology controllable throughout the product's life cycle ?
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Displacement on Demand has been in works for the last 25 years…..
finally:
GM announces that the 2005 model year GMC Envoy XL, Envoy XUV and Chevrolet trailblazer EXT will be the first vehicles to showcase its innovative Displacement on Demand fuel-saving technology, which enhances fuel economy without compromising performance or the ability to carry heavy loads. Displacement on Demand is to be a standard feature in the vehicles' optional Vortec 5300 V-8 engine. The technology, which boosts the Vortec engine's fuel efficiency by 8 percent, is also to be introduced in other GM engines in the 2006 model year.
EVALUATION BASED ON TECHNOLOGY READINESS ASSESSMENT
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Hybrid car
EVALUATION BASED ON TECHNOLOGY READINESS ASSESSMENT
2000 2010
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http://www.veva.bc.ca/enfield/enfield1.jpg
2004
EVALUATION BASED ON TECHNOLOGY READINESS ASSESSMENT
http://www.dieselstation.com/pics/2011-Holden-Volt-car-pics.jpg
2010
Electric car
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EVALUATION BASED ON TECHNOLOGY READINESS ASSESSMENT
Film camera Digital camera
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EVALUATION BASED ON TECHNOLOGY READINESS ASSESSMENT
Incandescent Luminescent LED
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EVALUATION BASED ON GO/NO GO SCREENING
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Concept 1
Poncho
Fender concepts
Concept 2
Device attached to seat post and back of seat
Concept 3
Spring loaded roll
Concept 4
Sissy bar
Concept 5
Device to brush-off water
Concept 6
Half fender
Concept 7
Standard fender with quick release
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Evaluation Based on Go/No Go Screening
Easy to attach
Not rattle
Long life
Lightweight
Not release accidentally
For the sake of simplicity we’ll consider only 5 requirements
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Goal is to compare each concept with the customer requirements in an absolute
fashion.
Each customer requirement must be transformed into a question to be
addressed to each concept.
The questions should be answerable as either Yes or Maybe (Go),
or No (No-Go).
If a concept has only a few No-Go responses, then it may be worth modifying
the design rather than eliminating it.
Evaluation Based on Go/No Go Screening
-1 - no
0 -
maybe
1 -
yes
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Evaluation Based on Go/No Go Screening
The winner
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Evaluation Based on Decision Matrix
The method provides a means of scoring each concept relative to
another in its ability to meet the customer requirements.
This method tests the completeness and understanding of the
requirements, identifies the strongest concepts, and helps foster
new concepts.
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Evaluation Based on Decision Matrix
Decision-Matrix Form
Concepts for Comparison
Scores
Totals
Wei
gh
tsCustomer Requirements
The relative importance of requirements found using pair-wise comparison technique
Concepts to be compared
1 2
3
4
5
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Evaluation Based on Decision Matrix1. Requirements
Easy to attach
Not rattle
Long life
Lightweight
Not release accidentally
For the sake of simplicity we’ll consider only 5 requirements
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Evaluation Based on Decision Matrix
We find the relative importance of these requirements using pair wise comparison technique:
Easy to attach
Not rattle
Long life
lightweight
Not release accidentally
Rating of relative importance:
Equal 1
More important 3
Strongly more important 5
Very strongly more important 7
Extremely more important 9
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" Which requirement is more important to the success of the product?Note: follow the rule “row is more important than column”
Evaluation Based on Decision Matrix, Pair Wise Comparison Technique
Relative importance of requirementsRequirements
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Generate scores (i.e. which customer requirements to use).
Datum - the designer's favorite concept
0 - same as datum
+ 1 - better than datum
- 1 - worse than datum
Evaluation Based on Decision Matrix
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Evaluation Based on Decision Matrix
The winnerRelative importance of requirements
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EVALUATION OF SNOW SHOVEL DESIGN CONCEPT
USING THE DECISION MATRIX METHOD
Concept A Concept B Concept C Concept D
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Concepts for Comparison
Scores
Totals
Wei
gh
tsCustomer Requirements
The relative importance of requirements found using pair-wise comparison technique
Concepts to be compared
1 2
3
4
5
Evaluation Based on Decision Matrix
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Requirements placed on a snow shovel:
Easy to handle
Removes snow fast
Durable
Concepts of a snow shovel design:
A, B, C, D
Which one to choose?
Evaluation Based on Decision Matrix
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The winner
Datum
Pair-wise comparison
Evaluation Based on Decision Matrix
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Concept A Concept B Concept C Concept D
Datum Winner
Evaluation Based on Decision Matrix
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SPECIFICATIONS, CONCEPT GENERATION AND SELECTION SUMMARY
Need
Concept 1
Concept 2
Concept 3
…
Concept n
QFD
Functional Decomposition
Morphological Analysis
Ideation
Brainstorming
Patents
Reference (Books, Trade Journals)
Experts’ help
Feasibility judgment
Technology readiness
Go/no go screening
Decision matrix method
Final conceptRequired
functionality
Des
ign
rev
iew
1
Des
ign
rev
iew
2
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