lecture 3 mechatronics
TRANSCRIPT
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Chap.4-Mech.Actuator
Chap4. Mechanical Actuator Systems
1-the usefulness of hydraulic and pneumatic systems as
mechatronics elements.
2- the usefulness of mechanical elements such as mechanisms,gears, cams, etc.
3- questions and problems.
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- Hydraulic and pneumatic systems are similar
except that:
- Hydraulic system uses an incompressible fluid as
the working medium,
- a pneumatic system uses air, which is basicallycompressed.
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Advantages of using air as a working medium:
1- Readily available and no recycling is
necessary2- It is non-flammable so leakage does not create
threat to safety
3- It has negligible change in viscosity, whichcontrols the systems performance
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Advantages of using incompressible fluid a working
medium:
1- the incompressibility of fluid helps in positive
action of motion.
2- faster response (unlike pneumatic system
where there are longer time delays)
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Symbols for hydraulic and pneumatic systems:
- Symbols are invaluable to designers in
representing complex fluid power systems.
- The standard ANSI (American National Standard
Institute) are used.
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ANSI symbols
for hydraulic
and
pneumaticsystems
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the major components of hydraulic and pneumatic
systems are:
- Pumps
- Compressors
- valves
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pumps are used to supply the high pressure that the
mechatronic systems require.
Three types are most commonly used:
1- gear pump
2- vane pump3- piston pump
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1- gear pump
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1- vane pump
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1- piston pump
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Selection of different types of pumps:
1- rotary gear pumps are comparatively less costly
and work under pressures up to
2- units designed to work under pressure up to
are also available.
3- Their efficiency is lower than other types.
2750kN/m
22000kN/m
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Selection of different types of pumps:
1- vane pumps are usually costlier.
2- greater efficiency than gear pumps.
3- their max. pressure is limited to2750kN/m
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Selection of different types of pumps:
1- rotary piston pumps are usually costlier and more
efficient than other types.
2- they can operate up to 27000kN/m
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Two types of compressors are most commonly used:
1- centrifugal compressor
2- axial compressor
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1- centrifugal compressor
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1- axial compressor
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- The valves are used to control the direction and
amount of flow in hydraulic or pneumatic system.- Several types are commonly used:
1- relief valve
2- differential pressure regulating valve
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1- relief valve
Limit the max.
obtainable pressure
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2- differential pressure regulating valve
Maintain p=(P1-P2)=const.
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1. Title of the project
2. Introduction
1. Definition of the project2. Background
3. Literature review
4. Problem & solution3. Description of the project
4. Staff requirements
5. Equipments required6. Budget required
7. Duration and Time schedule
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