Design Analysis

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Chapter 10 Design Analysis Presented by Tom
Kohls Mike Poggensee Todd Cannegieter Bill
Uknes Ben Hadley
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10.1 Evaluating Alternative Designs

• Prioritize the design goals
• Formulate a scheme to rate designs
• Score designs based on ratings and goals
• Compare scores of designs
• Re-evaluate

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10.2 Rank-Ordering the Design Goals
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10.3 Assigning Weighting Factors to Design Goals

• Decide upon range values

• Separate the range into categories of significance

• Critical goals- range of 71-100

• Midrange goals- range of 31-70

• Optional goals- range of 1-30

• Evaluate each goal

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10.4 Rating the Alternative Designs An
example range (1-4)
4. Great
3. Fine
2. Less than average
1. Scrap
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10.5 Decision Matrix
Total
955
765

• Decision Factor Weighting Factor Rating Factor

• Sum up all the decision factors

• Largest sum is the winner

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10.6 Kepner-Tregoe Decision and Potential
Problem Analysis

• Divide goals into MUSTS and WANTS

• MUSTS into GO or NO-GO

• Give WANTS a rating factor and a weighing factor

• Sum the WANTS, largest is the winner

• Assess the winner for hazards and risks

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10.7 Value and Subjectivity of a Decision Matrix
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Cost Estimation
10.8 Economic Analysis

• Costs involved with the development of a design
  must be estimated.
• Methods Engineering

• Costs by Analogy

• Statistical Cost Analysis

• Rule of Thumb

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Return on Investment
ROI(profit/costs)100

• Increase by modifying design or manufacturing
• process.

• Critical design goals/ethics.

• Figures should be as accurate as possible.

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Time Value of Money
FP(1i)n Ffuture worth Ppresent
worth iinterest rate ntime
Examples loans, depreciation, annual payments
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