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MapleSim Hydraulics Library from Modelon

Lever  Mechanical actuation of a valve

The Lever component describes a mechanical actuation of a valve. This model is based on the PreLoad example (in MapleSim, click the Help menu item, and then select Examples > Physical Domains > 1-D Mechanical).

When designing hydraulic valves, it is often necessary to hold the spool in a certain position as long as an external force is below a threshold value. If this force exceeds the threshold value, a linear relation between the force and the position is desired.

There are designs that need only one spring to accomplish this task. Using the ElastoGap component this design can be easily modeled.

Drawing of spool.

Spool position s as a function of working force f.

The input port of this model connects to components from the 1-D Mechanical  Translational library.

The output of this component is of type Real.

 

Variables

Connections

Parameters

Variables

Name

Value

Units

Description

Modelica ID

InnerContactA

 

 

 

InnerContactA

InnerContactB

 

 

 

InnerContactB

Spool

 

 

 

Spool

FixedLe

 

 

 

FixedLe

SpringPlateA

 

 

 

SpringPlateA

SpringPlateB

 

 

 

SpringPlateB

Spring

 

 

 

Spring

OuterContactA

 

 

 

OuterContactA

OuterContactB

 

 

 

OuterContactB

Rod1

 

 

 

Rod1

Friction

 

 

 

Friction

Housing

 

 

 

Housing

Rod3

 

 

 

Rod3

Rod4

 

 

 

Rod4

Rod2

 

 

 

Rod2

PositionSensor1

 

 

 

PositionSensor1

Limiter1

 

 

 

Limiter1

Rod5

 

 

 

Rod5

Gain1

 

 

 

Gain1

Connections

Name

Description

Modelica ID

flangea

 

flange_a

y

 

y

Parameters

Name

Default

Units

Description

Modelica ID

housing

0.0305

m

Length of housing

HousingLength

srel0spring

0.025

m

s_rel0 of main spring

Spring_s_rel0

cspring

2.·104

 

Stiffness of main spring

spring_c

Rod1

0.007

m

Length of rod 1

Rod1_Length

Rod2

0.007

m

Length of rod 2

Rod2_Length

Rod3

0.00575

m

Length of rod 3

Rod3_Length

Rod4

0.00575

m

Length of rod 4

Rod4_Length

Rod5

0.0802

m

Offset for position measuring sensor

Rod5_Length

amplifier gain

160

 

Gain of amplifier for position sensor

Amplifier_Gain

umax

1

 

Maximum value of spool position

uMax

umin

1

 

Minimum value of spool position

uMin

See Also

DirectionalControl

ElastoGap

MapleSim Hydraulics Library from Modelon Overview

 


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