Engineering Design process for the advancement

Textbook: Design for ECE Engineers, Ford &
Coulston
1
The Engineering Design Process
 Creative process
 Problem solving – the big picture
 No single "correct" solution
 Technical aspects only small part

Coulston
2
Elements of Design the Process
 Problem Identification
 Research Phase
 Requirements Specification
 Concept Generation
 Design Phase
 Prototyping Phase
 System Integration
 Maintenance Phase

Text book: Design for ECE engineers Ford &
Coulston
3
Cost of Design Changes
 Costs increase exponentially as the
project lifetime increases

Coulston
4
Problem Identification and
Requirements Specification

Coulston
5
Needs Identification
 What is the Problem?
1. Collect information
2. Interpret information
3. Organize needs hierarchy
4. Determine relative importance of needs
5. Review outcomes and process

Coulston
6
Example Needs Hierarchy

Coulston
7
Problem Statement
 Example 2.1
 Need: Drivers have difficulty seeing
obstructions in all directions
 Objective: design system to avoid
accidents

Coulston
8
Requirements Specification
 Identifies requirements design must
satisfy for success
1. Marketing requirements
 Customer needs
2. Engineering requirements
 Applies to technical aspects
 Performance requirements

Coulston
9
Properties of Engineering
Requirements
1. Abstract – what, not how
2. Unambiguous – unique and specific
 Unlike marketing requirements
3. Traceable – satisfy need?
4. Verifiable – test/measure

Coulston
10
Example Engineering
Requirements
 Performance and Functionality
1. Will identify skin lesions with a 90% accuracy
2. Should be able to measure within 1mm
 Reliability
1. Operational 99.9% of the time
2. MTBF of 10 years
 Energy
1. Average power consumption of 2 watts
2. Peak current draw of 1 amp

Coulston
11
Properties of Requirements
Specification
1. Normalized (orthogonal) set
2. Complete set
3. Consistent
4. Bounded
5. Granular – system vs. component
6. Modifiable
 From IEEE Std. 1233-1998

Coulston
12
Constraints
 Economic
 Environmental
 Ethical and Legal
 Health and Safety
 Manufacturability
 Political and Social – FDA, language?
 Sustainability

Coulston
13
Standards
 Examples – RS-232, TCP/IP, USB
 Types
 Safety
 Testing
 Reliability
 Communications
 Documentation
 Programming Languages

Coulston
14
Concept Generation and
Evaluation
 Explore many solutions
 Brainstorm
 Select the best solution
 Based on needs and constraints
 Creativity
 Development of new ideas
 Innovation
 Bringing creative ideas to reality

Coulston
15
Creativity

Coulston
16
Barriers to Creativity
 Perceptual blocks
• Limiting problem space
 Emotional blocks
• Fear of failure – “fail early and often”
 Environmental blocks
• Engineering cultural bias
 Intellectual and expressive blocks
• Understand tools

Coulston
17
Strategies to Enhance Creativity
 Lateral thinking
 Question
 Practice
 Suspend judgment
 Allow time
 Think like a beginner

Coulston
18
Concept Generation
 Substitute – new elements
 Combine – existing elements
 Adapt – different operation
 Modify – size, shape, function
 Put to other use – other app domains
 Eliminate – parts or whole
 Rearrange or reverse – work better

Coulston
19
Concept Table

Coulston
20
Concept Evaluation

Coulston
21
Design Considerations
1) WORST CASE DESIGN
 Component variation
 Environmental conditions
 Use computer simulations

Coulston
22
2) RELIABILITY
 measured by MTBF, failure rate = 1/MTBF
 mechanical parts fail first
 design redundancy into system
 simple system/fewer parts = more reliable

Coulston
23
3) SAFETY
identify failure modes
provide protection
4) TEST
design for ease of test
5) PRODUCTION/MANUFACTURING
consider ease of assembly

Coulston
24
Design Methodologies:
Top-Down
 Also called “functional decompostion“
 implementation details considered only
at the lowest level
 top-down design, is not so clean and
linear in practice
 Often implementation-level
commitments are made at high levels in
the design process

Coulston
25
Design Methodologies
CASE-BASED:
 Research a specific, similar design case study
 Model your process on that
INCREMENTAL REDESIGN:
 Find an existing design and "unravel" the
design from the bottom up
 Modify as required
 Detailed and least global aspects of the
design are explored and redesigned, if
necessary, first

Coulston
26
ITERATIVE REFINEMENT:
 An iterative top-down approach
 First a rough, approximate and general
design is completed
 Then we do it finer, more exact and
more specific
 This process continues iteratively until
the complete detail design in done

Coulston
27
BOTTOM-UP DESIGN:
 Opposite of top-down
 Start at the bottom with detail design
 To do this, you must have some idea of where
you are going. So, often this becomes...
HYBRID DESIGN:
 Combines aspects of both top-down and
bottom-up
 More practical design approach then pure
top-down
 Start with a top-down approach, but have
feedback from the bottom

Coulston
28
"EXPLORER" METHOD:
 Typically used for new design ideas or research.
It is useful in initial design and specification
stages, and is often used when in "unfamiliar
territory":
1) Move in some direction; e.g. toward the library,
telephone, domain expert's office, etc.
2) Look at what you find there.
3) Record what you find in your notebook.
4) Analyze findings in terms of where you want to be.
5) Use results of analysis to choose next direction.
6) Back to 1) and continue exploring

Coulston
29
Top-Down Application:
Digital Design
SIMPLE DIGITAL STOPWATCH
Engineering requirements
 No more than two control buttons
 Implement Run, Stop and Reset
 Output a 16-bit binary number for
seconds

Coulston
30
Top-Down Design: Level 0

Coulston
31
Top-down Design: Level 1

Coulston
32
Top-down Design: Level 1 (cont’)

, Textbook: Design for ECE Engineers, Ford &
Coulston
33
Top-down Design: Level 1 (cont’)

Coulston
34
Design Group (Team)
 Engineering projects require diverse skills
 This creates a need for group (team) work
 Select members based on skills
1. Technical
2. Problem-solving
3. Interpersonal

Coulston
35
Design Group (Team)
 Develop decision making guidelines
1. Decision by authority (leader)
2. Expert Member
3. Average member opinion
4. Majority
5. Consensus

Coulston
36
Design Group (Team)
 Teams that spend time together tend to
be successful teams
 Respect each other
1. Listen actively
2. Consider your response to others
3. Constructively criticize ideas, not people
4. Respect those not present
5. Communicate your ideas effectively
6. Manage conflict constructively

Coulston
37
Design Group (Team)
 Hold effective meetings
1. Have an agenda
2. Show up prepared
3. Pay attention
4. Schedule time and place of next meeting
5. Summarize
 Assign tasks and responsibilities

Coulston
38
Project Management
 Work breakdown structure
 Hierarchical breakdown of tasks and
deliverables need to complete project
 Activity
1. Task – action to accomplish job
2. Deliverable – e.g. circuit or report

Coulston
39
Project Management
 Define for each activity
1. Work to be done
2. Timeframe
3. Resources needed
4. Responsible person(s)
5. Previous dependent activities
6. Checkpoints/deliverables for monitoring
progress

Coulston
40

Coulston
41
Schedule – Gantt Chart

Coulston
42
Project Management
 Guidelines
 Project plan after design plan complete
 Double time estimates and add 10%
 Assign a lot of integration and test time
 Remember lead times for parts ordering
 Assign tasks based on skills and interests
 Track progress versus plan
 Plans change

Coulston
43
Project Communication
Focus on needs of specific audience
 Who?
 level of knowledge
 their motivation – needs
 Why?
 to persuade
 to inform

Coulston
44
Project Proposal
• One goal is to sell idea, be persuasive
 In industry the proposal will show:
1. Product is useful for someone for something
2. The design will work, it will solve the problem
3. Will meet the specified constraints
 Additionally, in Senior Design, the proposal
should show:
1. You are learning something new
2. Sufficiently complex
3. Apply previously learned ECE knowledge

Coulston
45
Project Proposal Format
• Second goal is to inform
1) Title page - project title, names, date, 404 lecture section
number, group number.
2) Table of Contents, with page numbers.
3) Introduction
4) Problem Analysis
5) Requirements Specification
6) Preliminary Design. Include a block diagram - the more
detailed the better. Will help with the scheduling and task
assignment
7) Preliminary Schedule (see Figure 10.3, Gantt chart)
8) Conclusion – summarize why this will be a great senior
project.
9) References – any references used in proposal development

Coulston
46
Oral Presentations
 Structure
1. Intro: Tell them what you will tell them
 Introduce group and project
 Overview and background
2. Body: Tell them
 Use top-down approach
 Support main points
3. Conclusion: Tell them what you told them
 Summarize and emphasize main points

Coulston
47
Oral Presentations
 Tips
 Prepare – practice, practice, practice
 Eye contact with entire audience
 Avoid too much information
 Meet time constraints
 Look and act professionally
 Use visuals effectively

Coulston
48
Oral Presentations
 Slides
 Use a large font, 24 pt or more
 Avoid more than 4 or 5 bullets per page
 Avoid fancy graphics that add no value
 Group slides for major points (top-down)
 Avoid reading slides

49
Presentations
• Your presentation should be 10 to 15 minutes for a project
engineering team (5-10 min for a team of 2). Due to the limited
class time you will be cutoff if you exceed the upper limit.
• Make sure you read Chapter 12 in the text, Evaluation:
 Professionalism - appearance, manner, visual aids
 Clarity - Can we understand what your design is about?
 Organization - Is your talk well-organized? Does it follow a
logical progression? Is it presented in a top-down manner?
 Completeness - Are all the parts there? Did you provide a good
introduction? Clear, positive conclusions and/or summary? etc...
 Communication - Did you maintain eye contact with the entire
audience? Did they understand you ? etc...
 Time Limits - Did you stay within the specified time limits?
 Questions - Were you successful at fielding questions after you
presentation? Are you knowledgeable on the subject matter ?

50
Presentations
Good....................OK…....................Poor
4 3 2 1 0
Introduction ___ ___ ___ ___ ___
Clarity ___ ___ ___ ___ ___
Organization ___ ___ ___ ___ ___
Professionalism ___ ___ ___ ___ ___
Communication ___ ___ ___ ___ ___
Conclusion ___ ___ ___ ___ ___
Time limits ___ ___ ___ ___ ___
Completeness ___ ___ ___ ___ ___
Understanding ___ ___ ___ ___ ___
Questions ___ ___ ___ ___ ___
 Evaluation and Grade Sheet

Engineering Design process for the advancement

More Related Content

Similar to Engineering Design process for the advancement (20)

More from PhysicsUtu (13)

Recently uploaded (20)

Engineering Design process for the advancement