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WOLFRAM SYSTEM MODELER

BleedOff

Example circuit with bleed-off flow control

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.

bleedOffPlot1

Fig. 1 Load position with slightly closed(throttleArea = 1e-07 m^2) and open (throttleArea = 1e-06 m^2) throttle orifice opening respectively

bleedOffPlot2

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)

medium	Value: Oil() Type: Medium Description: Medium in the component
throttleArea	Value: 1e-07 Type: Area (m²) Description: Throttle orifice opening area (1e-6 = Open, 1e-7 = Slightly closed)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

throttleArea

Value: 1e-07

Type: Area (m²)

Description: Throttle orifice opening area (1e-6 = Open, 1e-7 = Slightly closed)

Components (18)

	medium	Type: Medium Description: Medium in the component
	tank1	Type: Tank Description: Simple tank with constant pressure
	tank2	Type: Tank Description: Simple tank with constant pressure
	pump	Type: Pump Description: Model of a pump with fixed displacement and volumes
	tank3	Type: Tank Description: Simple tank with constant pressure
	mass	Type: Mass Description: Sliding mass with inertia
	positionSensor	Type: PositionSensor Description: Ideal sensor to measure the absolute position
	cylinderDouble	Type: CylinderDouble Description: Double cylinder model
	const	Type: Constant Description: Generate constant signal of type Real
	constantSpeed	Type: ConstantSpeed Description: Constant speed, not dependent on torque
	pressureReliefValve	Type: PressureReliefValve Description: Pressure valve, controlled by the pressure difference between the ports
	controlValve	Type: PCVE43TandemCenter Description: Electrically actuated proportional control valve with four ports and three states
	min	Type: Min Description: Pass through the smallest signal
	stopStep	Type: Step Description: Generate step signal of type Real
	startStep	Type: Step Description: Generate step signal of type Real
	tank4	Type: Tank Description: Simple tank with constant pressure
	throttle	Type: FixedTurbulentThrottle Description: Turbulent restriction
	speedSensor	Type: SpeedSensor Description: Ideal sensor to measure the absolute velocity