Engineering Design Process
ASME (ASME B31.4 & B31.8)
Date: 01 & 02 / 12 / 2022
Courtesy of:
ZAINALMOHD SALLEH
(MSc, CEng, CTPEng, CSWIP, CWI, ASNT LII, TTT HRDF, ToT, UK, ISO Lead A)
• Engineering design is…
• The process of devising a system, component or process to
meet needs
• A decision-making process in which science and
mathematics are applied to convert resources to meet
objectives
• Establishing objectives & criteria, synthesis, analysis,
construction, testing, and evaluation
Problem Characteristics
• Engineering Problem
•
Problem statement incomplete,
ambiguous
Science Problem
Succinct problem statement
Identifiable closure
•
No readily identifiable closure
Unique solution
•
Solutions neither unique nor compact
Problem defined and solved with
•
Solution needs integration of many
specialties
Specialized knowledge
Typical Design Problems
7“Design a system for lifting and moving loads of up to 5000 lb in a
manufacturing facility. The facility has an unobstructed span of 50
ft. The lifting system should be inexpensive and satisfy all relevant
safety standards.”
Studying Engineering Design
• Develop student creativity
• Use open-ended problems
• Use design theory and methods
• Formulate design problem statements
• and specifications
• Consider alternative solutions
• Consider feasibility
Studying Engineering Design
• Know and apply production processes
• Understand concurrent engineering design
• Create detailed system descriptions
• Include realistic constraints such as…
Economic factors, safety, reliability
aesthetics, ethics, social impacts
“Awesome” Engineers…
• Place ethics and morals above all else
• Are team players
• Follow a deterministic design process
• Follow a schedule
• Document their work
• Never stop learning
Module Organization:
The Design Process
• 1. Identify a need, who is the “customer”
• 2. Establish design criteria and constraints
• 3. Evaluate alternatives (systems or components)
• 4. Build a prototype
• 5. Test/evaluate prototype against criteria
• 6. Analyze, “tweak” ( ), redesign ( ), retest
• 7. Document specifications, drawings to build
Engineering Design Process
Backup Chart
• 1. Identify a need
• 2. Establish design criteria and constraints
• 3. Evaluate alternatives
• 4. Build prototype
• 5. Test/evaluate against design criteria
• 6. Analyze, redesign, retest
• 7. Communicate the design
The Engineering
Design Process
Design is an Iterative Process
• Begins with a recognition
Models or prototypes are
made and problems that
of need for a product,
arise may require new
service, or system
ideas to solve and a return
• During the idea phase
to an earlier stage in the
encourage a wide variety
process
of solutions through
brainstorming, literature
Finally drawings are
search, and talking to
released to manufacturing
users
for Production
• Best solutions are
selected for further
refinement
Engineering Design Defined
ASME (ASME B31.4 & B31.8)
Date: 01 & 02 / 12 / 2022