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GE 121 – Engineering Design - 2009 Engineering Design GE121 Finding Answers to the Problem Part III / IV Lecture 12A.

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Presentation on theme: "GE 121 – Engineering Design - 2009 Engineering Design GE121 Finding Answers to the Problem Part III / IV Lecture 12A."— Presentation transcript:

1 GE 121 – Engineering Design Engineering Design GE121 Finding Answers to the Problem Part III / IV Lecture 12A

2 GE 121 – Engineering Design Limiting Design Space to a Usable Size  Pragmatic (practical) issues related to how an artifact will be used, and how it will be made  Provides ‘guideposts’ for development of the search space – may narrow rather than expand the search space  Design alternatives must be functions of  User Needs  Available Technologies  External Constraints  (and some common sense!)

3 GE 121 – Engineering Design Limiting Design Space to a Usable Size (Continued)  Example – Design of vehicles for a campus transportation system  Candidate Vehicles Simple bikes High Tech bikes Recumbent bikes Tricycles Rickshaws  User Needs may dictate consideration of: Parking availability Carrying Packages Access for Handicapped

4 GE 121 – Engineering Design Limiting Design Space to a Usable Size (Continued)  Available Technologies may affect design alternatives: Materials (affects appearance, manufacturing, price)  External Constraints may limit design alternatives: Team’s area of expertise (may be expert in tricycle design) Available Manufacturing Facilities (may dictate material)  Practical Considerations – Common Sense! Invoke and apply constraints (similar to user needs, as above) Freeze the number of attributes (avoid those unlikely to seriously affect design – i.e. color) Impose some order on the list (which functions / features are most important) Get Real! (watch out when silly / infeasible options are repeated too often)

5 GE 121 – Engineering Design Morphological Charts: Organizing Functions and Means to Generate Designs that Work  Morphological Charts - Important Alternative Development tools  Chart or Matrix Functions or Key Features are listed in the first column Alternate Means of achieving each function are given in that function’s row  Generating the Means for each function can be a highly creative process Means do not have to be Words – some designers use sketches or thumbnails to show some alternative means

6 GE 121 – Engineering Design Morphological Charts (continued)  The Morphological Chart can be used to generate Complete Alternatives Leftmost column lists ALL functions Selecting a means from EACH row guarantees that the solution satisfies all required functionality  Will NOT, however, guarantee that Alternatives will WORK Or even be internally consistent (see Fig. 5.2b) Judgement is still required  This approach can result in a HUGE number of alternatives

7 GE 121 – Engineering Design Morphological Charts (continued)  Start with Functions  Contain Beverage  Material for Beverage Container  Provide Access to Juice  Display Product Information  Sequence Manufacture of Juice and Container

8 GE 121 – Engineering Design Morphological Charts (continued)  Add Means for Each Function  Contain Beverage: Can, Bottle, Bag, Box  Material for Beverage Container: Aluminum, Plastic, Glass, Waxed Cardboard, Lined Cardboard, Mylar Films  Provide Access to Juice: Pull-Tab, Inserted Straw, Twist-Top, Tear Corner, Unfold Container, Zipper  Display Product Information: Shape of Container, Labels, Color of Material  Sequence of Manufacture: Concurrent, Serial

9 GE 121 – Engineering Design Morphological Charts (continued) Create Morph Chart (words) Or – Use Thumbnails (next page) Fig. 5.1 p104

10 GE 121 – Engineering Design Fig. 5.3 p106

11 GE 121 – Engineering Design Morph Chart Generating a Complete Alternative  Morph Chart showing one means for each function which can be combined to form one complete alternative that looks feasible Fig. 5a

12 GE 121 – Engineering Design Morph Chart Complete Does not Mean Feasible  Morph Chart showing a complete alternative that is not consistent – Glass Bottle with a zipper (zip-lok requires plastic) Fig. 5b

13 GE 121 – Engineering Design Managing Your Group  You may want to consider appointing someone to fill each of the following roles:  Project leader  Scribe/recorder  Project file keeper  Report co-ordinator

14 GE 121 – Engineering Design C-Sketch Method  It may be helpful to use the C-Sketch Method to generate ideas from your Morph Chart (examples from microlaryngeal stabilization device)

15 GE 121 – Engineering Design Activity  Create a Morph Chart for your project Start with a List of functions Brainstorm a List of Means for each Function Be Creative in your Brainstorming!


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