Theory and Design of Machine Elements
ME 603
Lecturer : 3 Year : III
Tutorial : 1 Part : I
Practical : 2
Course Objective:
After completion of this course, the
students will be able to:
·
Select proper mechanisms and analyze it for
agricultural machines.
·
Carry out simple design or modify the
existing design for product development or repair and maintenance work.
·
Know how the failure can take place on
components of agricultural machines.
·
Select the most appropriate machine
elements by catalogue/data book references.
1.
Mechanism [4
hours]
1.1 Introduction
of mechanism
1.2 Mechanism
configuration, Link, pair and chain
1.3 Degree
of freedom of mechanism
1.4 Inversion
of mechanism – single slider crank mechanism
2.
Kinematic Analysis
of Mechanism [8
hours]
2.1 General plane motion representation
2.2 Relative motion velocity analysis –
Velocity polygons
2.3 Velocity of any point on the link or
outside the link [offset point]
2.4 Velocity and angular velocity of different
links
2.5 Velocity and angular velocity diagrams of
quadratic cycle chain and slider crank mechanism
2.6 Velocity of rubbing at pin joints
2.7 Instantaneous centers of velocity and
Kennedy’s theorem
2.8 Instantaneous center method to find out
velocity of any link on quadratic cycle
chain
2.9 Acceleration diagrams of quadratic cycle
chain and slider crank mechanism
2.10 Centripetal, tangential and coriolis
components of acceleration of a link
3.
Fundamentals of
Machine Design [6
hours]
3.1 Introduction to engineering design and design
process
3.2 Material properties and selection of material
in m\ c design
3.3 Theories of failures
3.4 Endurance limit of materials
3.5 Factors affecting fatigue strength
3.6 Stress concentration effects
3.7 Fatigue failure curves
3.8 Factors of safety and basis for safety factor
3.9 Use of data hand book for safety factor,
design codes [ISI and ISO codes]
4.
Shaft, Axle, Keys
and Shaft Couplings [5
hours]
4.1 Functions
application, type and material
4.2 combined
bending and torsion effects
4.3 Power
and torque considerations
4.4 Fatigue
strength stress concentration and keyways effect
4.5 Critical
speed of shaft
4.6 Design
of keys
4.7 Design
of couplings
5.
Journal Bearing [6
hours]
5.1 Types,
application and material
5.2 Journal
bearing terminology
5.3 Hydrodynamic
theory of lubrication of rotating journal
5.4 Viscosity,
petroff’s law, bearing characteristic numbers
5.5 Operating
pressure load and heat balance of bearing
5.6 Design
procedure
6.
Ball and Roller
Bearing [5
hours]
6.1 Construction
and types of ball bearing
6.2 Design
for variable loads and axial load
6.3 Operating
capacity of rolling element bearing
6.4 Bearing
load, life and reliability relationship
6.5 Selection
of bearings, lubrication, mounting and enclosure
7.
Gears [6
hours]
7.1 Classification
of gears and gear terminology
7.2 Gear
tooth profiles – Cycloidal and Involute
7.3 Angle
of obliquity
7.4 Causes
of gear tooth failure
7.5 Design
of spur gear considering static, dynamic and wear tooth load
7.6 Helical,
Bevel and Worm gear characteristic requirements for design
8.
Clutch and Brake [5
hours]
8.1 Purpose,
Type, Working principle and application of clutch
8.2 Design
steps for friction clutch – Multidisc and cone clutch
8.3 Design
basis of uniform wear and uniform pressure assumption
8.4 Purpose,
Type, Working principle and application of brake
8.5 Design
procedure for block brake
8.6 Friction
material and heat dissipation
8.7 Operation
system and control system
Practical:
1.
Pro-active
learning approach: Each student will
carry out a research project. S/he should write 4-8 pages summary on her/his
topic and
deliver it taking 10-15 minute time. The sample topic may be one of the
following:
a)
Design for manufacturing
b)
Material selection for gear
c)
Design for assembly
d)
Optimal design
e)
Value engineering
f)
Patenting
g)
Bench marking
2.
Undertaking
Design project: One team of the student will be 2 to 3 in number and
it will complete a design project of a product on:
a)
A gravel conveyor
b)
A garage door opener
c)
A lifting device
d)
A maze planter
e)
A sprinkler
f)
A mechanical jack to lift and lower the
load
3.
Live
field project: Mechanical design related industrial problems as an
assignment.
Tutorial:
1.
Problem solving on related topics.
2.
Old questions of TU examination will be the
base for tutorial classes.
3.
Number of numerical examples in each
chapter should be solved in the classes according to the weight-age given for
TU final examination.
4.
Preference is to be given for applied type
of questions that includes synthesis and analysis of real problem of machine
design.
Evaluation Scheme:
The
questions will cover all the chapters of the syllabus. The evaluation scheme
will be as indicated in the table below
|
Chapter
|
Hours
|
Mark
Distribution*
|
|
1
|
4
|
8
|
|
2
|
8
|
12
|
|
3
|
6
|
12
|
|
4
|
5
|
8
|
|
5
|
6
|
12
|
|
6
|
5
|
8
|
|
7
|
6
|
12
|
|
8
|
5
|
8
|
|
Total
|
45
|
80
|
*There
may be minor variation in marks distribution.
References:
1.
Theory of Machine and Mechanisms by J. E.
Shigley and J. J. Uicker, Jr. McGraw Hill Publication, 1980.
2.
Mechanisms and Dynamics of Machinery,
Fourth Edition by H. H. Mabie and C. F. Reinholtz, Wiley Publication.
Source: Department of Agricultural Engineering
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