INTRODUCTION TO MECHANISMS. Machine. Combination of resistant bodies so arranged that by their. . means the mechanical forces of nature can be compelled to do. . work accompanied by certain determinate motion.. ID: 674479
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INTRODUCTION TO MECHANISMSSlide2
Combination of resistant bodies so arranged that by their
means the mechanical forces of nature can be compelled to do
work accompanied by certain determinate motion.
• In the above definition we are only concerned with the mechanical
machines. The definition does not include electrical or heat
g. a computer or a heat pump is not included as a
machine with the above definition).
• The main characteristics of a mechanical machine is that there is
force (or torque) accompanied with motion, Some exceptions to
this characteristics are mechanical calculating machines,
indicating instruments, etc. In these types
there is no actual work output. The work input is dissipated as heat
due to friction within the system.Slide3
structure is constructed to perform a particular task, such as a sewing
machine, a mixer, a hair cutter, a lath, a packaging machine, etc.Slide4
A group of rigid bodies connected to each
other by rigid
kinematic pairs (joints)
to transmit force and motion.
A mechanism may be
considered as an isolated group of rigid bodies through the study of which we can understand the basic structure of any
machine and can design machines that are not in existence.Slide5
may involve a number of mechanisms and certain elements that
are not rigid (although resistant)
, such as hydraulic drives, springs, dashpots,flexible elements, etc.
Machine and MechanismSlide7
are used in all kinds of
industry.Whenever there is a need for motionaccompanied with force, there is a
I. Introduction to Mechanisms
• To understand the terms used in mechanisms
• To understand and be able to
use the degree of
freedom of space, and the degree of freedom of a
joint concept,• To understand and be able to use the
degree offreedom of a mechanism
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