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Chapter 6 Wrap-Up and Test 2 Review (C01)

# Chapter 6 Wrap-Up and Test 2 Review (C01) - Chapter 6...

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Chapter 6 Wrap-Up & Test 2 Review Week 9 Lectures

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Week 9 Lectures ENG 1P03 2011 2
“The Poor Person’s Car” Week 9 Lectures ENG 1P03 2011 3

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CHAPTER 6 WRAP-UP Week 9 Lectures ENG 1P03 2011 4
Detail Design Chapter 6 presents an example of detail design where mathematics and physics are used to find the optimal selection of the rung height and material. Week 9 Lectures ENG 1P03 2011 5

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Design Variable It is a [mathematical] variable that the designer has to give a value to. For the ladder rung example, these were the height of the rung and material. Week 9 Lectures ENG 1P03 2011 6
Design Space The set of all possible design alternatives. Each alternative is a choice of value for each design variable. Week 9 Lectures ENG 1P03 2011 7

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Design SPACE EXAMPLE 1 Passenger Capacity Number of Wheels 2 3 4 5 6 7 1 2 3 4 Week 9 Lectures ENG 1P03 2011 8
Design SPACE EXAMPLE 1 Passenger Capacity Number of Wheels 2 3 4 5 6 7 1 2 3 4 Week 9 Lectures ENG 1P03 2011 9

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Constraint A constraint is a limit on the design space. Week 9 Lectures ENG 1P03 2011 10
Constraint Example 1 1 Passenger Capacity Number of Wheels 2 3 4 5 6 7 1 2 3 4 Constraint : Number of Wheels ≠ 3 and Number of Wheels ≠ 1 Week 9 Lectures ENG 1P03 2011 11

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Constraint example 2 1 Passenger Capacity Number of Wheels 2 3 4 5 6 7 1 2 3 4 Constraint : Number of Wheels ≥ 2 and Passenger Capacity ≥ 4 Week 9 Lectures ENG 1P03 2011 12
Criteria A criterion is a way to measure how one design is better than another. A measure of performance. Week 9 Lectures ENG 1P03 2011 13

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Criterion example 1 Passenger Capacity Number of Wheels 2 3 4 5 6 7 1 2 3 4 Criterion : Maximum fuel efficiency per passenger (litres/100 km/passenger) 3.3 1.2 1.4 5.0 Week 9 Lectures ENG 1P03 2011 14
Limiting Constraint The limiting constraint is the constraint that places the greatest limit on a given design variable.

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Chapter 6 Wrap-Up and Test 2 Review (C01) - Chapter 6...

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