Engineering designQ1. Pugh concept selection – fast-food coffee cups
In the search for more environmentally friendly design, paper cups have replaced Styrofoam cups in most fast-food restaurants. These cups are less effective insulators, and the paper cups often get too hot for the hand. A design team is in search of a better disposable coffee cup. The designs to be evaluated are: (a) a standard Styrofoam cup, (b) a rigid injection-molded cup with a handle, (c) a paper cup with a cardboard sleeve, (d) a paper cup with a pull-out handle, and (e) a paper cup with a cellular wall. These design concepts are to be evaluated with the Styrofoam cup as the datum. The engineering characteristics on which the cups are evaluated are:
1. Temperature in the hand.
2. Temperature of the outside of the cup.
3. Material environmental impact.
4. Indenting force of cup wall.
5. Texture of cup wall. 6. Manufacturing complexity.
7. Ease of stacking the cups.
8. Ease of use by customer.
9. Temperature loss of coffee over time.
10. Estimated cost for manufacturing the cup in large quantities.
Using your knowledge of fast-food coffee cups, use the Pugh concept selection method to select the most promising design.
Q1.Answer
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Possible Pugh chart

Interpretation
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Q3 – weighted decision matrix – SUV
Four preliminary designs for sport-utility vehicles had the characteristics listed in the following table. Using the weighted decision matrix, which design looks to be the most promising

Q3-Answer
Start by constructing an objective tree that fits with the given table weight factors…
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Objective tree
Calculate and construct the decision matrix
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Interpret the decision matrix
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