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ME 2220: Kinematics and Dynamics of Machinery
Jan-April 2014
Section B
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Instructor: Parag Ravindran
Office: Room 409, Machine Design Section
Phone:044-2257-4714
Email:[email protected]
Roll Numbers in this class: ME12B056 to ME12B116
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Importance of Learning Objectives
Observable and measurable: What can students DO ?
Provide students with a clear focus for their learning efforts
Direct instructional activities
Guide assessment strategies
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Blooms Taxonomy: 2001
REF: http://blogs.setonhill.edu/games/2012/01/02/blooms-taxonomy/
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What do Engineers do?
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What do Engineers do?
- Develops products and processes to satisfy societal needs.
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Mechanisms and Machines
Mechanism:
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Mechanisms and Machines
Mechanism: A combination interconnected rigid bodies capable of
relative motion. Eg: Slider Crank Mechanism.
A More precise definition will be given later.
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Mechanisms and Machines
Mechanism: A combination interconnected rigid bodies capable of
relative motion. Eg: Slider Crank Mechanism.
A More precise definition will be given later.
Machine: Is a mechanism or collection of mechanisms thattransmits motion and force from the source to the load.
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Mechanisms and Machines
Mechanism: A combination interconnected rigid bodies capable of
relative motion. Eg: Slider Crank Mechanism.
A More precise definition will be given later.
Machine: Is a mechanism or collection of mechanisms thattransmits motion and force from the source to the load.
Machine or Mechanism:
Mechanism: Primary objective is to transfer and transform motion.
Machine: Primary objective is transferring mechanical energy.Every machine is a mechanism.
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Inventions of contraptions to enhance human abilities.
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Inventions of contraptions to enhance human abilities.
Shifting and lifting of heavy objects: lever, wedges, pulleysIrrigation, pumping of waterWind mills and water wheels.
Looms, clocks, printing machines
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Inventions of contraptions to enhance human abilities.
Shifting and lifting of heavy objects: lever, wedges, pulleysIrrigation, pumping of waterWind mills and water wheels.
Looms, clocks, printing machinesAdvent of the Industrial Revolution
EnginesMachine tools for various operations.
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Some Uses of Mechanisms
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Some Uses of Mechanisms
To generate large forces
For fast rotation
For creating geometrically perfect motion for accuracy and
precision
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A framework to handle all the varied mechanisms is the subject ofKDOM
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A framework to handle all the varied mechanisms is the subject ofKDOM
Two Aspects to design of a mechanical system:
The geometrical aspects of motionVarious forces involved in motion
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A framework to handle all the varied mechanisms is the subject ofKDOM
Two Aspects to design of a mechanical system:
The geometrical aspects of motionVarious forces involved in motion
The study of only the geometrical aspects of motion without any
considerations of the forces involved or inertia is referred to as
KINEMATICS
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A framework to handle all the varied mechanisms is the subject ofKDOM
Two Aspects to design of a mechanical system:
The geometrical aspects of motionVarious forces involved in motion
The study of only the geometrical aspects of motion without any
considerations of the forces involved or inertia is referred to as
KINEMATICS
When inertia and forces are also considered:
DYNAMICS/KINETICS
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Theory of Mechanisms and Machines
OBJECTIVES:
Provide the necessary tools to systematically synthesize a system
(i.e to arrive at the critical shapes and dimensions of the bodies
constituting the system)
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Theory of Mechanisms and Machines
OBJECTIVES:
Provide the necessary tools to systematically synthesize a system
(i.e to arrive at the critical shapes and dimensions of the bodies
constituting the system)
Synthesis followed by analysis (kinematic and dynamic analysis)to evaluate performance
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Theory of Mechanisms and Machines
OBJECTIVES:
Provide the necessary tools to systematically synthesize a system
(i.e to arrive at the critical shapes and dimensions of the bodies
constituting the system)
Synthesis followed by analysis (kinematic and dynamic analysis)to evaluate performance
Iterative Process
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Theory of Mechanisms and Machines
OBJECTIVES:
Provide the necessary tools to systematically synthesize a system
(i.e to arrive at the critical shapes and dimensions of the bodies
constituting the system)
Synthesis followed by analysis (kinematic and dynamic analysis)to evaluate performance
Iterative Process
Optimal Synthesis
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Theory of Mechanisms and Machines
OBJECTIVES:
Provide the necessary tools to systematically synthesize a system
(i.e to arrive at the critical shapes and dimensions of the bodies
constituting the system)
Synthesis followed by analysis (kinematic and dynamic analysis)to evaluate performance
Iterative Process
Optimal Synthesis
The design of a mechanism to satisfy certain perscribed kinematicspecifications is generally termed kinematic synthesis. Eg: Design a
cam profile to generate a prescribed motion of the follower.
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Kinematic Pairs
A link is a rigid body that possesses at least two nodes (points for
attachments to other links)
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Kinematic Pairs
A link is a rigid body that possesses at least two nodes (points for
attachments to other links)binary links, ternary links, quaternary links
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Kinematic Pairs
A link is a rigid body that possesses at least two nodes (points for
attachments to other links)binary links, ternary links, quaternary links
AKINEMATIC PAIR (OR JOINT)is a connection between 2 or
more links at their nodes which allows some motion between the
connected bodies
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Kinematic Pairs
A link is a rigid body that possesses at least two nodes (points for
attachments to other links)binary links, ternary links, quaternary links
AKINEMATIC PAIR (OR JOINT)is a connection between 2 or
more links at their nodes which allows some motion between the
connected bodies
Degrees of Freedom (or Mobility): The number of independent
coordinates required to completely specify the relative movement.
These coordinates are known as pair variables.
ALSO
Number of inputs needed to create a predictableoutputSection B KDOM 11 / 11
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