Machine Dynamics-I (ME-404)
Instructor: Dr. Subrata Kumar Panda, PhD
Area of Expertise: Solid Mechanics,
Nonlinear Vibration
Smart Composite Structures
Laminated Composite
Shell Structure
Nonlinear FEM
Modeling and Simulation
Shape Memory Alloy
Contact details:call2subrat@gmail.com
*
Mob: 9658583368
* Mail contact will be appreciated
Mechanics
Theoretical Mechanics
Micro/Nano Mechanics
Solid
Computational Mechanics
Continuum Mechanics
Fluid
Applied Mechanics
System
Multiphysics
Computational Mechanist: Person having problem (engg. problem/ design complex prob.)
searching for the solution
Applied Mechanist: Person having solution searching for the problem
Theoretical Mechanist: Person who will show the existence of solution and the problem
Courses of Studies
1. Simple Mechanism: Classification of links and pairs, kinematics chains, degrees of freedom, Grashof’s
law, Kutzbach criterion, Grubler’s criterion for plane mechanism. Four bar mechanism and its inversions.
Single slider crank chain and its inversions. Double slider crank chain and its inversion.
2. Velocity in Mechanism: Velocity of a point on a link by instantaneous center method, Numbers and types
of instantaneous centers in a mechanism. Location of instaneaous centers. Kennedy’s theorem, Velocity of a
point in a link by relative velocity methods. Velocities of four-bar and slider crank mechanism.
3. Acceleration in Mechanism: Acceleration of point on a link, Acceleration diagram of a link, Acceleration
in the slider crank and four bar mechanism .Klein’s construction, Analytical method of finding acceleration of
a piston and connecting rod, Coriolis’ components of acceleration.
4. Kinetics: Equivalent dynamical system to replace a rigid body, two mass systems, Hook’s joint, Davis and
Ackerman Steering gears. Compound pendulum, Bifilar and Trifler suspension
5. Friction: Friction of a square threaded screw and V-threads, Friction of journal, pivot and collar bearings,
single plate, multiplate and conical clutches (Centrifugal clutch).
6. Belt and Rope Drive: Velocity ratio, Effect of belt thickness and slip on velocity ratio, Length of belt,
Ratio of driving tensions, Power transmitted by belt ,Centrifugal tension .Maximum power transmitted by
belts, Creep and initial tension, V-belt. Ratio of tensions in rope drive.
7. Brakes and Dynamometer: Block brakes, Band Brakes, Band and Block Brakes, Absorption and
Transmission Dynamometers, Pony Brakes, Rope Brake, Belt Transmission and torsional Dynamometer.
8. Kinematics of Cam: Types of cams and followers, Displacement velocity and acceleration-time curves for
uniform velocity, uniform acceleration, simple harmonic motion and cycloid motion, Graphical construction
of cam profiles for different types of followers, Cams with specified contours.
Text Book:
1. Theory of Machines by S. S. Ratan, TMH
Reference Book:
1. Theory of Machines by Shigley J, TMH
2. Machines and Mechanisms: Applied Kinematics Analysis by David H Myszka, PHI
3. Theory of Mechanism and machines by Sharma & Purohit, PHI
4. Theory of Machines by Thomas Bevan
5.
Some more references
•NPTEL Lecture Notes
•Carnegie Mellon University Lecture Notes
•MIT Lecture Notes
•Springer Lecture Notes on Dynamic System
Module No.&Name
Section No.&Name
Lesson Plan
Topics/Coverage
No of
Lectures
Lecture
Serial Nos.
1.Introduction
Topics to be covered, their objectives and
real world engineering applications.
1
1-1
2. Frictions(Part-I)
1.Friction of a square threaded screw and
V-threads
4
2-5
3. Simple Mechanism 1.Classification of links and pairs
2. Four-bar, slider crank and Double slider
crank mechanism and their inversions,
mobility simple mechanism
3.Problems
6
6-11
4.Velocity Analysis
of Mechanism
1.Instantaneous center, Kenndy’s theorems, 5
2.Relative velocity methods
3. Velocity diagram of four-bar and slider
crank mechanisms.
4.Problems
12-16
5. Frictions(Part-II)
1Journal, pivot and collar bearings
2.Plate clutch and conical clutch
3 Problems
17-21
5
L.P. Contd.
6.Brakes and
Dynamometer
7.Acceleration
Analysis of
Mechanism
8.Lower Pairs
9.Belt and Rope
Drives
1.Block and Band Brakes
2.Absorption and Transmission Dynamometers
3.Problems
1.Accelerations of four-bar , slider crank mechanisms and
acceleration diagram
2. Klein’s construction and Coriolis’ components of
acceleration.
3.Problems
4
22-25
4
26-29
1. Steering Mechanism and Ackermann Steering Mechanism
2.Hooke’s Joint: Single and Double
3.Problems
1.Open and Cross belts their length and velocity ratio
2. Ratio of driving tensions, power transmitted by belt and
centrifugal tension
3.Slip and creep in belt and initial tension
4.V-belt and ratio of tensions in rope drive
5..Problems
5
30-34
6
35-40
6
41-46
10.Kinematics of 1.Types of cams and followers
2. Displacement, velocity and acceleration –time curves.
3.Graphical construction of cam profiles
4. Problems
Machine Dynamics
Kinematics and Dynamics of Machines
Kinetics and Kinematics of Machines
Theory of Machines
Mechanism: the fundamental physical or chemical processes involved in or responsible for an
action, reaction or other natural phenomenon.
Machine: an assemblage of parts that transmit forces, motion and energy in a predetermined
manner.
Simple Machine: any of various elementary mechanisms having the elements of which all
machines are composed. Included in this category are the lever, wheel and axle, pulley, inclined
plane, wedge and the screw.
The word mechanism has many meanings. In kinematics, a mechanism is a means of transmitting,
controlling, or constraining relative movement. Movements which are electrically, magnetically,
pneumatically operated are excluded from the concept of mechanism. The central theme for
mechanisms is rigid bodies connected together by joints.
A machine is a combination of rigid or resistant bodies, formed and connected do that they move
with definite relative motions and transmit force from the source of power to the resistance to be
overcome. A machine has two functions: transmitting definite relative motion and transmitting
force. These functions require strength and rigidity to transmit the forces.
The term mechanism is applied to the combination of geometrical bodies which constitute a
machine or part of a machine. A mechanism may therefore be defined as a combination of rigid or
resistant bodies, formed and connected so that they move with definite relative motions with
respect to one another.
Although a truly rigid body does not exist, many engineering components are rigid
because their deformations and distortions are negligible in comparison with their
relative movements.
The similarity between machines and mechanisms is that
•they are both combinations of rigid bodies
•the relative motion among the rigid bodies are definite.
The difference between machine and mechanism is that machines transform
energy to do work, while mechanisms so not necessarily perform this function.
The term machinery generally means machines and mechanisms. The following
figure shows a picture of the main part of a diesel engine. The mechanism of its
cylinder-link-crank parts is a slider-crank mechanism, as shown in
Cross section of a power cylinder in a diesel engine
Skeleton outline