Introduction to Engineering Design

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CHAPTER 3
Introduction to Engineering Design

© 2011 Cengage Learning Engineering. All Rights Reserved.

3-1

Engineering – An Exciting Profession
• Introduction to engineering profession

• Preparing for an engineering career
• Introduction to engineering design
• Engineering communication
• Engineering Ethics

© 2011 Cengage Learning Engineering. All Rights Reserved.

3-2

Outline
In this chapter we will

• Introduce you to the engineering design
process
• Discuss the basic steps that most engineers
follow when designing a product
• Discuss the importance of considering
sustainability in design

© 2011 Cengage Learning Engineering. All Rights Reserved.

3-3

Outline (continued)
• Introduce important design factors such as
 Economic consideration
 Material selection
 Teamwork
 Project scheduling
 Engineering standards and codes
• Present cases studies in civil, mechanical/
electrical engineering
© 2011 Cengage Learning Engineering. All Rights Reserved.

3-4

Objectives
The main objective of this chapter is:

To introduce the steps engineers follow to
successfully design products or provide
services that we use in our everyday lives

© 2011 Cengage Learning Engineering. All Rights Reserved.

3-5

Design Process – Basic Steps
1. Recognizing the need for a product or a service
2. Problem definition and understanding
3. Research and preparation
4. Conceptualization

5. Synthesis
6. Evaluation
7. Optimization

8. Presentation
© 2011 Cengage Learning Engineering. All Rights Reserved.

3-6

Design Process – Basic Steps (continued)
Step 1: Recognizing the need for a product
or a service

© 2011 Cengage Learning Engineering. All Rights Reserved.

3-7

Design Process – Basic Steps (continued)
Step 2: Problem definition and understanding

• This is the most important step in any design
process
• Before you move on to the next step
 Make sure you understand the problem
 Make sure that the problem is well defined
• Good problem solvers are those who first fully
understand what the problem is
© 2011 Cengage Learning Engineering. All Rights Reserved.

3-8

Design Process – Basic Steps (continued)
Step 3: Research and preparation
• Collect useful information
 Search to determine if a product already exists
 Perhaps you could adopt or modify existing
components
 Review and organize the information collected in a
suitable manner
Step 4: Conceptualization
Generate ideas or concepts that could offer
reasonable solutions to your problem
© 2011 Cengage Learning Engineering. All Rights Reserved.

3-9

Design Process – Basic Steps (continued)
Step 5: Synthesis
• At this point you begin to consider details
• Perform calculations, run computer models,
narrow down the type of materials to be used, size
the components of the system, and answer
questions about how the product is going to be
fabricated
• Consult pertinent codes and standards for
compliance
© 2011 Cengage Learning Engineering. All Rights Reserved.

3-10

Design Process – Basic Steps (continued)
Step 6: Evaluation

• Analyze the problem in more
detail
• Identify critical design
parameters and consider their
influence in your final design
• Make sure that all calculations
are performed correctly

• Best solution must be
identified from alternatives
© 2011 Cengage Learning Engineering. All Rights Reserved.

• Details of design
must be worked out
fully

3-11

Design Process – Basic Steps (continued)
Step 7: Optimization – minimization or maximization

• Optimization is based on some particular criterion
such as cost, strength, size, weight, reliability,
noise, or performance.
• Optimizing individual components of an
engineering system does not necessarily lead to
an optimized system

© 2011 Cengage Learning Engineering. All Rights Reserved.

3-12

Design Process – Basic Steps (continued)
An optimization...
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