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8/8/2019 lecture 03 2007 09 12
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1Lecture 03 2007 09 12
8/8/2019 lecture 03 2007 09 12
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2Lecture 03 2007 09 12
General Comments:
- No matter how well the design team thinks it understands a problem,it should employ the QFD technique for all mechanical designprojects, because in the process the team will learn what it doesn'tknowabout the problem.
The customer's requirements must be translated into measurabledesign targets before a large amount of time and resources areinvested in the design effort.
It is important to first consider what needs to be designed and, onlyafter that is fully understood, to worry about how the design will lookand work.
It helps avoiding intuitive approach to design where product aredesigned because designers think it is a neat thing to design
QUALITY FUNCTION DEPLOYMENT (QFD)
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3Lecture 03 2007 09 12
QFD is one of many tool presently used in the quality systems worldwide
QUALITY FUNCTION DEPLOYMENT (QFD)
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4Lecture 03 2007 09 12
Quality product
Works as it should
Last a long time
Easy to maintain
Characteristics of quality
Performance
Features
Reliability
Durability
Serviceability
Conformance to conventions/standards
Aesthetics
Perceived quality/reputation of manufacturer
QUALITY PRODUCT
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5Lecture 03 2007 09 12
SHRUB PROTECTOR
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6Lecture 03 2007 09 12
We want to develop a new product: something that will protect shrubs from being eaten
by bunnies, groundhogs etc.
We use the QFD technique to link customer requirements with engineering specifications.
Design Need Products that
Meet Need
Paths of the Design Process
We are here
SHRUB PROTECTOR
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7/297Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what
4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?
8. Set engineering targets: How much is good enough?
House owners,
SHRUB PROTECTOR
8/8/2019 lecture 03 2007 09 12
8/298Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what
4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent on
each other?
7. Identify and evaluate the competition: How satisfied is the customer now?
8. Set engineering targets: How much is good enough?
Effective in protecting shrubs
Easy to install
Inexpensive
Looks good
Long lasting
Adjustable to size
SHRUB PROTECTOR
8/8/2019 lecture 03 2007 09 12
9/299Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what
4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?
8. Set engineering targets: How much is good enough?
Effective in protecting shrubs 5
Looks good 2Long lasting 1
Easy to install 4
Inexpensive 3
Adjustable to size 3
5 very important,
4 important3 somewhat important
2 - minimally important
1 not that important
SHRUB PROTECTOR
8/8/2019 lecture 03 2007 09 12
10/2910Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what
4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?
8. Set engineering targets: How much is good enough?
Size
Strength of material
Weight
Oxidation resistance
# of sections
SHRUB PROTECTOR
8/8/2019 lecture 03 2007 09 12
11/2911Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what
4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent on
each other?
7. Identify and evaluate the competition: How satisfied is the customer now?
8. Set engineering targets: How much is good enough?
SHRUB PROTECTOR
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12Lecture 03 2007 09 12
SHRUB PROTECTOR
5
5
8/8/2019 lecture 03 2007 09 12
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13Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what
4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?
8. Set engineering targets: How much is good enough?
SHRUB PROTECTOR
?
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14Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what
4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?
8. Set engineering targets: How much is good enough?
The eight basic steps in the Quality Function Deployment technique are:
SHRUB PROTECTOR
?
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15Lecture 03 2007 09 12
SHRUB PROTECTOR
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16Lecture 03 2007 09 12
BBQ LIGHTER IN CLASS EXERCISE
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17Lecture 03 2007 09 12
CRAMPONS
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18Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what
4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?
8. Set engineering targets: How much is good enough?
Trekkers who occasionally need to cross a glacier or a snow field.
CRAMPONS STEP 1
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19Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?8. Set engineering targets: How much is good enough?
Ability to walk on ice and hard snow
Ability to climb on ice but no hard core climbing
LightweightEasy to attach
Stays on firmly
Easy to detach
Snow wont stick
Use with normal boots
CRAMPONS STEP 2
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20Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?8. Set engineering targets: How much is good enough?
5 very important,
4 important
3 somewhat important
2 - minimally important
1 not that important
Ability to walk on ice and hard snow 5
Ability to climb on ice but no hard core climbing 2
Lightweight 3
Easy to attach 3
Stays on firmly 5
Easy to detach 2
Snow wont stick 4
Use with normal boots any size 5
CRAMPONS STEP 3
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21Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?8. Set engineering targets: How much is good enough?
Walk on ice, snow
Easy climb
Lightweight
Easy to attach
Stays on firmly
Easy to detach
Snow wont stick
Normal boots
CRAMPONS STEP 3
5
2
3
3
5
5
4
5
Low maintenance 3
Customer
requirements andtheir relative
importance
1 - 5
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22Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?8. Set engineering targets: How much is good enough?
CRAMPONS STEP 4
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23Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?8. Set engineering targets: How much is good enough?
Walk on ice, snow
Easy climb
Lightweight
Easy to attach
Stays on firmly
Easy to detach
Snow wont stick
Normal boots
Material
#ofspikesfront.
#ofstraps
Timetoattach
Forcetodislodge
CRAMPONS STEP 4
5
2
3
3
5
5
4
5
#ofspikesrear.
Timetodetach
Low maintenance 3
Finish
Materialno
stickplates
Engineering
specifications
Customer
requirements and
their relative
importance
1 - 5
Notes:
Material is material density
as % of steel
Material of no stick plates is
coefficient of friction with
snow
Days: # of days in saltspray to first damage
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24Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?8. Set engineering targets: How much is good enough?
CRAMPONS STEP 5
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25Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?8. Set engineering targets: How much is good enough?
Walk on ice, snow
Easy climb
Lightweight
Easy to attach
Stays on firmly
Easy to detach
Snow wont stick
Normal boots
Material
#ofspikesfront.
#ofstraps
Timetoattach
CRAMPONS STEP 5
5
2
3
3
5
5
4
5
#ofspikesrear.
Timetodetach
Low maintenance 3
Finish
Materialno
stickplates
7
9 9
9
5
5
9
9
7
7 7
7 7
Relations
between
customer
requirements and
engineeringspecifications
Forcetodislodge
UNITS % days s s N
ABSOLUTE IMPORTANCE 27 41 27 120 56 56 36363
7% 11% 7% 33% 15% 15% 9%RELATIVE IMPORTANCE
Relative importance of
engineering specifications
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26Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?8. Set engineering targets: How much is good enough?
CRAMPONS STEP 6
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27Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent oneach other?
7. Identify and evaluate the competition: How satisfied is the customer now?8. Set engineering targets: How much is good enough?
Walk on ice, snow
Easy climb
Lightweight
Easy to attach
Stays on firmly
Easy to detach
Snow wont stick
Normal boots
Material
#ofspikesfront.
#ofstraps
Timetoattach
Forcetodislodge
CRAMPONS STEP 6
5
2
3
3
5
5
4
5
#ofspikesrear.
Timetodetach
Low maintenance 3
Finish
Materialno
stickplates
7
9 9
9
5
5
9
9
7
7 7
7 7
3
5
Relations between
engineering
specifications
UNITS % days s s N
ABSOLUTE IMPORTANCE 27 41 27 120 56 56 36363
7% 11% 7% 33% 15% 15% 9%RELATIVE IMPORTANCE
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28Lecture 03 2007 09 12
1. Identify the customers: Who are they?
2. Determine the customers' requirements: What do the customers want?
3. Determine relative importance of the requirements: Who versus what
4. Generate engineering specifications: How will the customers' requirements be met?
5. Relate customers , requirements to engineering specifications: Hows measure whats?
6. Identify relationships between engineering requirements: How are the "hows" dependent on
each other?
7. Identify and evaluate the competition: How satisfied is the customer now?
8. Set engineering targets: How much is good enough?
CRAMPONS STEP 7
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29Lecture 03 2007 09 12
DESIGN INFLUENCE ON PRODUCT COST
Specification
Development
% of product
cost
committed
Conceptual
Design
Detailed Product
Design
Time
100
60
0
20
40
80
Having completed the design specification phase we
have already committed 40% of product cost!