MET 319 Lecture Notes - Lecture 2: Mechanical Engineering, Air Compressor, Mechanical Advantage
22 May 2018
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Often within their specialties, engineers will select a role that focuses on one of the followign aspects:
research, design, manufacturing, repair, or management
What classes?
fundamentals of engineering, statics, dynamics, robotics, mechanics, thermodynamics, calculus, and
physics
Mechanical engineering technician
-under the direction of an engineer
-assist engineers by completing drawings and models and by conducting research and tests
force
push or pull on an object resulting from contact with another object
work
the application of force to move an object a distance
power
the rate at which work is performed or energy is transmitted
energy
the ability to do work
potential energy
energy that is stored and waiting to be used
kinetic energy
energy in motion
mechanical energy
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energy in motion that uses mechanical devices for conversion
ex of mechanical device
levers, wheels. gears, pistons, internal combustion engine
power systems
take energy and convert it into power to accomplish work (electrical, fluid, mechanical)
Mechanical power systems use one of four different types of motion:
linear motion
rotary motion
reciprocating motion
intermittent motion
oscillating motion
irregular motion
linear motion
movement in a straight line
rotary motion
any motion that moves in a circle (often connected to intermittent motion)
reciprocating motion
linear back and forth motion
intermittent motion
when movement starts and stops regularly
oscillating motion
rotary back and forth motion that uses a single pivot point
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irregular motion
when the movement does not follow a constant pattern
friction
a force that acts against motion when 2 surfaces rub together
in many situations....are used together in a system
several types
what motion is used to power a number of systems in a car?
rotary
simple machines
tools that make work easier
the fundamental concepts of most designs rely on 6 simple machines:
lever
inclined plane
wheel and axle
screw
wedge
pulley
mechanical advantage
the number of times a machine or tool multiples the input force to move a load
who do simple machines make it eaiser to do work?
the transform the input force by increasing the distance
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