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Lecture 05 Concept Selection Chapter 7

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1. Lecture 05 Concept Selection. Chapter 7. Show LF cards to Drew at end of class ... Send by Email or bring on CD, USB is not acceptable ... – PowerPoint PPT presentation

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Title: Lecture 05 Concept Selection Chapter 7


1
Lecture 05 Concept SelectionChapter 7
  • Show LF cards to Drew at end of class
  • Last safety certification R 9/13 115
  • Visit LF and sign-up for machining classes
  • T 9/18 or R 9/20 600-1000
  • Hardcopy of SW parts 1 and 2 due today
  • Hardcopy of SW part 3 due W 9/16
  • Read Chapter 6 and 7 - Quiz 3 on F 9/14
  • Project 1 deliverables
  • Critical review due today
  • 3 minute pitch in-class F 9/14
  • 8 minute presentation in-class W 9/19
  • Final proposal due F 9/21

2
Project Deliverables
  • 3 minute pitch to class on F 9/14
  • One speaker, one or two slides
  • Design slide
  • Description of how concept meets customer needs
  • Image (sketch, rendering) of product
  • Production cost per unit
  • Marketing slide
  • Describe market and estimated volume
  • Marketing strategy (unique selling position)
  • Selling price
  • Not graded
  • Send by Email or bring on CD, USB is not
    acceptable

3
Project Deliverables (continued)
  • 8 minute project presentation on W 9/19
  • Two speakers maximum (must be different than
    pitch)
  • Five slides maximum
  • Prototype if available
  • Graded
  • See Lecture 06 for effective presentations
  • Send by Email or bring on CD, USB is not
    acceptable
  • Final proposal using outline in project packet
  • Due F 9/21
  • Submit as PDF to hjs1_at_psu.edu
  • Graded

4
(No Transcript)
5
How to Select from Multiple Design Choices
  • REMEMBER
  • Design is a Decision Making Process
  • Decision Matrix
  • Unweighted for concept screening
  • To reduce many choices to just a few
  • Weighted criteria for concept scoring
  • More detailed comparison for selection of one
    best concept

6
Decision Matrix for Concept Screening
Design Alternatives
Bumper_A Bumper_B Bumper_C Bumper_D
Cost Weight Appearance Safety Reliability
SCORE (either numerical, or /- to a reference)
Design Criteria
Numerical Scoring 0 far below average 3
average 5 far above average
7
Concept Generation and Screening
  • Review list of concepts
  • Add any new ideas from External Search
  • Construct Concept Screening Matrix
  • Score Concepts ( better, 0 same, - worse)
  • Rate Concepts

8
Concept ScreeningUnweighted Decision Matrix
9
Screening Concepts
  • Combine and improve
  • Narrow choices if appropriate
  • Iterate if necessary
  • Select one or more concepts
  • Reflect on results and the process
  • Down-select to two or three concepts for further
    development
  • What reference design will you use?
  • What criteria will you use?

10
Refine Concepts
  • Prior to doing your final down-select, refine
    your concepts
  • Create product specifications for the criteria in
    your matrix
  • Use a weighted scoring matrix for final concept
    selection
  • What weighting factors?
  • Try to judge from needs of customers

11
Concept ScoringWeighted Decision Matrix
12
Weighting Factors
  • Formal methods exist to determine weighting
    factors
  • Relative importance rankings of needs can guide
    assignment of weighting factors
  • Objective Tree arranged so that all levels in
    tree sum to 1
  • Analytical Hierarchy Process a more formal
    mathematical process
  • Reference Ch. 6 of Fundamentals of Engineering
    Design, by B. Hyman

13
Common Pitfalls
  • Explore the effects of different weighting
    factors on rankings (sensitivity analysis)
  • Assumes that product characteristics vary
    independently
  • Subjective criteria may be better judged by
    customers
  • Does not typically include cost

14
For Next Class
  • Show LF cards to Drew
  • SW part 1 and 2 due today
  • SW part 3 due W 9/19
  • Read Chapter 6 and 7 - Quiz 3 on F 9/14
  • Project 1 deliverables
  • 3 minute pitch in-class F 9/14
  • 8 minute presentation in-class W 9/19
  • Final proposal due F 9/21
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