The document outlines the engineering design process, emphasizing the importance of information acquisition and iteration in developing effective designs. It discusses the need for general and specific information, the evaluation of design outcomes, and the iterative nature of design, which allows for refinements based on previous results. Additionally, it notes that many designs are often halted due to feasibility concerns, yet they contribute valuable information for future use.

1. CONCEPTS
IN
ENGINEERING DESIGN

2. Basic
Models
In the
“Engineering Design Process”

3. Basic Models in the
“Engineering Design Process”
1. A Simplified Iteration Model
2. Design Method Vs Scientific Method
3. A Problem Solving Methodology

4. 1. A Simplified Iteration Model
General
information
Specific
information
Design
operation
Outcome
Evaluation
Feedback loop
No
Yes
Go to the
next step
There is no single universally acclaimed sequence of steps
that leads to a workable design.
Figure 1. : Basic module in the design process (After Morris Asimow)

5. (i) Information:
General
Information
Specific
Information

6. Acquisition of information is a vital and often very
difficult step in the design process. But, it is a step
that usually becomes easier with experience.
For the successful operation, it requires
information such as:
(i) General, technical, and business information
that is expected of the trained professional.

7. (ii) Very specific information, a few examples of
the specific information are:
(1) A manufacturer’s catalogue on miniature
bearings,
(2) Handbook data on the properties of
polymer composites,
(3) Personal experience gained from a trip to
observe a new manufacturing process.

8. Exploring the alternative concepts that could satisfy the
specify need
Formulating a mathematical model of the best system
concept
Specifying specific parts to construct a subsystem
Selecting a material from which to manufacture a
part
1
2
3
4
(ii) Design Operation:

10. (iii) Evaluation:
Evaluation
Analyze
Design
Development
Implement
Revision
Revision
Revision
Revision

11. • The design outcome must be evaluated, often by a
team of impartial experts, to decide whether it is
adequate to meet the need. If it meets the
requirements, the designer may go on to the next
step.
• If the evaluation uncovers deficiencies, then the
design operation must be repeated. The information
from the first design is fed back as input together with
new information that has been developed as a result
of questions raised at the evaluation step. We call this
iteration.

12. • The need to go back and try again should not
be considered a personal failure or weakness.
Design is an intellectual process, and all new
creations of the mind are the result of trial
and error.

13. • The iterative nature of design provides an
opportunity to improve the design on the
basis of a preceding outcome. That in turn,
leads to the search for the best possible
technical condition.
• However, the goal of many design projects is
not the creation of new hardware or
systems. Instead, the goal may be the
development of new information that can
be used else where in the organization.

14. • It should be realized that few system designs are
carried through to completion; most designs are
stopped because it has become clear that the
objectives of the project are not technically and/or
economically feasible.
• Regardless, the system design process creates new
information which, if stored in retrievable form, has
future value, since it represents experience.

15. Thank
You
Thank
You