The Process of Designjmkeith/arl/2005fall/f05afg2.pdf · the design • Establish user requirements...
Transcript of The Process of Designjmkeith/arl/2005fall/f05afg2.pdf · the design • Establish user requirements...
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The Process of Design
Jason M. KeithFuel Cells and Alternative Fuels Enterprise
Michigan Technological UniversityHoughton, MI 49931
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Rationale for this Presentation
• Design is usually taught discipline-specific at the end of the undergraduate curriculum
• CM4850 Process Analysis & Design• MEEM4900 Senior Design• EE4900 Design Fundamentals
• One of the most challenging subjects for studentsto learn and practicing engineers to use
• Participants in AFG enterprise have various interests, disciplines, and class standing
• AFG has a new project that requires a significantdesign effort
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What do I need? (Crowl, 2005)
To be successful at design you need:• Strong understanding of technical issues (comes
from your core courses)• Methodology of design (focus of this presentation)• “Soft” skills (more of an “art” but best learned by
experience)• Communication• Decision making• Time management• Budget management• Others
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“So what is Engineering Design?”
Dym & Little (2000):“The organized, thoughtful development and testingof characteristics of new objects that have a particular configuration or perform some desiredfunction(s) that meets our aims without violatingany special limitations.”There are often additional concerns such as:• No single “correct” solution• Conflicting specifications• Incomplete, extraneous, or incorrect data• Tradeoffs (especially when balancing economics &
environment)
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“Can you give me an example?”
Garden Design Project (Crowl, 2005)1. Find garden design resources in library2. Check zoning on gardens; check with neighbors3. Decide where to locate the garden
- accessibility, sun, water drainage issues4. Decide on garden size
- estimate crop yield to determine number ofplants, then use plant spacing tables
5. Sketch layout of garden- dimensions, where plants will be located
6. Determine materials required- seeds, plants, fertilizer, hoses, tools, etc.
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“Can you give me an example?”
Garden Design Project (Crowl, 2005)7. Develop planting schedule8. Schedule work for preparation and planting9. Maintain garden10. Harvest crops and replant new ones11. Prepare garden for fall & winter12. Eat (or sell) your vegetables
Real engineering design is like this example exceptthe costs are higher, there is more work, there area lot of people involved, and decisions need to be made
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The Prescriptive Model of Design
1. Problem Definition2. Conceptual Design3. Preliminary Design4. Detailed Design5. Design Communication
This model looks sequential but in real design theProcess is not linear!
Real design requires feedback through verification,validation, and iteration
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Problem Definition Phase of Design
• Clarify objectives and gather information todevelop an engineering statement of what theclient wants
• Given client statement, clarify objectives forthe design
• Establish user requirements for the design• Identify constraints for the design• Establish functions for the designWe can do this with: objectives tree, pairwisecomparison charts, weighted objectives trees, function-means tree, functional analysis, requirements matrix
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Problem Definition Phase of Design
We can do this with the following tools andtechniques: objectives tree, pairwisecomparison charts, weighted objectives trees, function-means tree, functional analysis, requirements matrix
Ways of obtaining useful information include:Literature review, brainstorming, user surveysand questionnaires, structured interviews
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Objectives Tree
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CombinedTree
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Dog on Chair
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PairwiseComparison
Charts
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Weighted Objectives Tree
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Black Box
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Transparent Box
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Function-Means Tree
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Conceptual Design Phase of Design
• Look for different concepts or schemes of candidate designs that can be used to achieveclient objectives
• Address some but not all technical objectives,being sure to maintain a high-level approach
• Establish design specifications• Generate design alternatives that satisfy the
above requirements
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Conceptual Design Phase of Design
We can do this with these tools: - performance specification method- quality function deployment- morphological chartUsing: brainstorming, divergent thinking, benchmarking, reverse engineering
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A Boy and his Dog
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PerformanceSpecification
Curve
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Morphological Chart
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AnotherMorphChart
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Preliminary Design Phase of Design
• Identify principal attributes of the design concept• “Flush out” proposed design schemes• Look at design subsystems and lower level
functions• Use rules of thumb and make final choice from
proposed concepts
Methods: weighted objectives tree, pairwisecomparison chart, numerical evaluation matrix
Means: metrics definition, prototype development,simulation / computer analysis, proof-of-concept
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NumericalEvaluation
Matrix
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AnotherNumericalEvaluation
Matrix
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References
Crowl D. Introduction to Chemical Engineering Design (2005 draft).Dym, C. L. and Little, P. Engineering Design:A Project-Based Introduction, Wiley, New York (2000).