WOLFRAM SYSTEM MODELER
BleedOffExample circuit with bleed-off flow control |
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Diagram
Wolfram Language
In[1]:=
SystemModel["Hydraulic.Examples.FlowControl.BleedOff"]
Out[1]:=
Information
This example model shows how to move a load with a cylinder and how the cylinder motion can be changed by adjusting the throttle. The method of placing the flow control valve in a branch of the supply line is called bleed-off. Fig. 1 shows the mass position and Fig. 2 shows the mass velocity.
In both Fig. 1 and 2, the blue line shows the behavior when the throttle opening has been decreased. The red line shows the behavior without decreasing the throttle opening.
Fig. 1 Load position with slightly closed(throttleArea = 1e-07 m^2) and open (throttleArea = 1e-06 m^2) throttle orifice opening respectively
Fig. 2 Load speed with slighty closed (throttleArea = 1e-07 m^2) and open (throttleArea = 1e-06 m^2) throttle orifice opening respectively
In both Fig. 1 and 2, the blue line shows the behavior when the throttle opening has been decreased. The red line shows the behavior without decreasing the throttle opening.
Fig. 1 Load position with slightly closed(throttleArea = 1e-07 m^2) and open (throttleArea = 1e-06 m^2) throttle orifice opening respectively
Fig. 2 Load speed with slighty closed (throttleArea = 1e-07 m^2) and open (throttleArea = 1e-06 m^2) throttle orifice opening respectively
Reference
Industrial Hydraulics Manual, 5th ed., Maumee, OH: Eaton Hydraulics Training Services, 2008 p. 302.Parameters (2)
Components (18)
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medium |
Type: Medium Description: Medium in the component |
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tank1 |
Type: Tank Description: Simple tank with constant pressure |
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tank2 |
Type: Tank Description: Simple tank with constant pressure |
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pump |
Type: Pump Description: Model of a pump with fixed displacement and volumes |
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tank3 |
Type: Tank Description: Simple tank with constant pressure |
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mass |
Type: Mass Description: Sliding mass with inertia |
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positionSensor |
Type: PositionSensor Description: Ideal sensor to measure the absolute position |
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cylinderDouble |
Type: CylinderDouble Description: Double cylinder model |
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const |
Type: Constant Description: Generate constant signal of type Real |
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constantSpeed |
Type: ConstantSpeed Description: Constant speed, not dependent on torque |
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pressureReliefValve |
Type: PressureReliefValve Description: Pressure valve, controlled by the pressure difference between the ports |
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controlValve |
Type: PCVE43TandemCenter Description: Electrically actuated proportional control valve with four ports and three states |
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min |
Type: Min Description: Pass through the smallest signal |
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stopStep |
Type: Step Description: Generate step signal of type Real |
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startStep |
Type: Step Description: Generate step signal of type Real |
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tank4 |
Type: Tank Description: Simple tank with constant pressure |
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throttle |
Type: FixedTurbulentThrottle Description: Turbulent restriction |
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speedSensor |
Type: SpeedSensor Description: Ideal sensor to measure the absolute velocity |