hydraulic power. hydraulics vs. pneumatics hydraulic systems... use a relatively incompressible...
DESCRIPTION
Hydrodynamic Systems Fluid is in motion Force and energy are transmitted by flow Water Turbine PropellerTRANSCRIPT
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Hydraulic Power
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Hydraulics vs. Pneumatics Hydraulic Systems . . . • Use a relatively incompressible liquid• Have a slower, smoother motion• Are generally more precise• Lubricate naturally• Are not as clean as pneumatics when
leakage occurs• Often operate at pressures of 500 - 5000 psi• Generally produce more power
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Hydrodynamic Systems
• Fluid is in motion • Force and energy are
transmitted by flow
Water Turbine Propeller
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National Fluid Power Association & Fluid Power Distributors Association
Hydrostatic Systems• Fluid does not flow quickly or
continuously• Fluid is pressurized• Force and energy transmitted
by pressure• Most common in industrial settings
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Liquid FlowFlow Rate
The volume of fluid that moves through a system in a given period of time Flow Velocity
The distance the fluid travels through a system in a given period of time
vQ ( A)Symbol Definition Example Units
Q Flow Rate gpm or gal/min
(gallons per minute)
in.3 / min
v Flow Velocity
fps or ft/s(feet per second)
in. / min
A Area in.2
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Mechanical Advantage
out
in
FMA F
National Fluid Power Association & Fluid Power Distributors Association
Force at the outputMechanical Advantage Force at the input
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Conservation of Energy: An increase in velocity results in a decrease in pressure. Likewise, a decrease in velocity results in an increase in pressure.
Bernoulli’s Principle
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Viscosity
The measure of a fluid’s thickness or resistance to flowCrucial for lubricating a systemMeasured in slugs/sec-ft (US) or centistokes (metric)– Hydraulic oil is usually around 1.4
slugs/sec-ft
Decreases as temperature increases
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Common Hydraulic System Components
National Fluid Power Association & Fluid Power Distributors Association
Cylinder
Transmission Lines
Directional Control Valve
Pump
Reservoir
Filter
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Click the lever on the valve to extend and retract the cylinder.
Common Hydraulic System Components
Reservoir Pump
Cylinder
Valve