SAN JOSE STATE UNIVERSITY
Mechanical and Aerospace Engineering Department
Mechanical System Design
Dr. Ken Youssefi
Office: IS106, phone: (510) 642
Office hrs. :
Friday Dec. 11, 9:45
Course website: www.engr.sjsu.edu/mae
Sept. 3 (Th.)
Last day to drop
, Sept. 11(Fri.)
last day to add
Introduction to the mechanical design process: Design specification development, conceptual design, and
process. Application of the fundamentals from statics, dynamics, strength of materials, static and
fatigue failure theories are applied to specific machine components. Emphasis will be placed on the integration
of the mechanical engineering disciplines and
systematic integrated approach to design of machine elements
and systems. Plastics and composite materials in design will be introduced. Also Introduction to fracture
mechanics will be covered in this course. The required group design project will increas
e the students'
understanding of the design process
and dynamics of team work
. 3 units.
ed., Prentice Hall, 2006
“The Mechanical Design Process”, 3th edition, McGraw
s (PowerPoint, see the website)
Baumeister, Avallon, et al,
Marks Handbook for Mechanical Engineers
American Society for Metals,
, Vols. 8
Juvinall and Marshek,
Fundamentals of Machine Components Design
, Wiley, 2001.
Formulas for Stress and Strain
, 6th ed, McGraw Hill, 1996.
Rolfe and Barsom,
Fracture and Fatigue Control in Structure
, Prentice Hall, 1996.
, McGraw Hill, 1984
Ertas, Atila and Jones, Jesse,
The Engineering Design Process
, Wiley, 1993.
Mechanical Engineering Design
McGraw Hill, 2004
problems are assigned a week befo
re due date.
Homework must meet a reasonable
standard of clarity and
No late homework will be accepted
without the consent of the instructor
Homework problems will
be reviewed in the class
and the solution will be posted on the Mechanical and
Aerospace Engr. (mae) website
, select faculty and then faculty web pages).
working in groups
are responsible for a design project, see the separate handout.
exam 20%, Final Exam 25%, Project 25
%, Homework 15%
Final course grade is determined using a normal distribution curve. Grade distribution:
average plus one standard deviation and higher
plus ½ standard deviation
average minus ½ standard deviation
average minus one standard deviation and lower
Academic Integrity Statement (University Policy)
“Your own commitment to learning, as evidenced by you
r enrollment at San Jose State University and the
University’s Integrity Policy, requires you to be honest in all yur academic course work. Faculty members are
required to report all infractions to the Office of Judicial Affairs.” All students should revie
w the Academic
Integrity Policy on cheating and plagiarism, copy of the policy can be found on the website at
Campus policy in compliance with th
e Americans with Disabilities Act
you need course adaptations of accommodations because of a disability, or if you need special arrangements
in case the building must be evacuated, please make an appointment with me as soon as possible, or see me
g office hours. Presidential Directive 97
03 requires that students with disabilities register with DRC to
establish a record of their disability.”
College and Department Policy
You are responsible for understanding the policies and procedures for
add/drop, academic renewal,
withdrawals, incomplete grade, classroom behavior, and other policies described in the catalog. Please read
your catalog thoroughly.
To introduce the Mechanical Engineering Process, design flow chart, identification of a need,
specification and requirements, conceptual design, evaluation of concepts, product design, human factor.
To design and select (from catalogs) various machine com
ponents such as: mechanical springs, contact
bearings, brakes and clutches, gears, shafts.
To introduce linear elastic fracture mechanics and design based on fracture toughness.
To have students work as a team to design a mechanical system and prepare a
Student Learning Objectives
The students should be able to:
Select a project to design a new product or modify an existing product, based on market research, and
carry it through the design process up to building the CAD prototype and
evaluation for function.
Determine the location and magnitude of the maximum stress on a component.
Estimate the value of the stress concentration factor and apply it correctly to the stress component.
Design a machine component to guard against yieldin
g or fracturing under static load using the
appropriate failure criteria and safety factors.
Design a machine component to guard against fatigue failure, either using the classical approach or the
fracture toughness approach.
Identify factors that have a
n influence on the design and selection of different machine components.
Design a spring, given the applied load and desired deflection, and select it from catalogs.
Select a suitable bearing from catalogs by knowing the bearing loads (radial and thrust)
, bearing life and
Design a gear reducer (planetary or conventional) to obtain a certain output speed and use AGMA code
to determine the allowable load and select a suitable gear from catalogs.
Aware of the choices they have when it comes to
material selections: metals as compared to composites
Introduction, course organization
esign project discussion
An overview of Design Process
and Concurrent Engineering
Product development planning, identification of a need,
Understanding customer needs
design group formation
HW 1 (ideas)
Benchmarking (case studies) and Engineering Specifications
Conceptual Design phase; concept generation
intuitive and logical
brainstorming and brain
Concept selection; estimati
ng technical feasibility,
Design project discussion
HW 2 (mission stmt)
Design for manufacturing and assembly; concept of theoretical
minimum number of parts, design guidelines
Physical prototype building and testing
, human factors in design
Design project specifications and
HW 3 (specs)
Review; fatigue failure theories
, example and design considerations
Midterm exam 1
Gears; fundamental law, standard tooth specification,
of gear tooth
Gear trains: conventional, planetary, and harmonic drives
HW 4 (fatigue)
Gears; force and stress analysis
AGMA code, design considerations
Bearings: Journal and rolling contact type, ball,
and thrust bearings.
Conceptual design due date (after presentation)
HW 5 (gear trains)
Bearings; bearing life and reliability, selecting bearing from catalog.
Flexible elements; belt and chain drives
Flexible elements; wire rope and flexible shafts, design consideration.
HW 7 (bearings)
Design of mechanical springs; tension, compression,
and specially design springs
Stresses, buckling and surging
sign using fracture mechanics approach
Fracture toughness and crack propagation rate
Design project discussion and e
Midterm Exam 2
Design using plastics
Design using composite materials;
structure, properties, applications and design considerations
Design project presentation
Design project presentation
last day of instruction
Holiday and Furlough days (no class)
: Monday Sept 7
, Monday Oct. 19, Wed.