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Double Acting Cylinder

Ideal transformation between hydraulic and 1-D translational work

 

Description

Equations

Variables

Connections

Parameters

Description

The Double Acting Cylinder component models a double-acting translational actuator. It transforms energy between the hydraulic and translational domains.

Optional end cushions restrict the stroke length of the piston.

Equations

qa=Aavrelqb=Abvrel

srel=sbsavrel=dsreldt

fa=fb={f+fe1+fe2Use end cushionsfotherwise

f=AapaAbpbdvrel

fe1={00fc1+fd1fc1+maxfc1,fd1otherwisefe2={0fc2+fd20fc2+minfc2,fd2otherwise

fc1&equals;{kcsrelLmaxLmax<srel0otherwisefc2&equals;{kcsrelLminsrel<Lmin0otherwise

fd1&equals;{ccvrelLmax<srel0otherwisefd2&equals;{ccvrelsrel<Lmin0otherwise

Variables

Name

Units

Description

Modelica ID

px

Pa

Pressure port x&comma;xA&comma;B

portx.p

qx

m3s

Flow rate through port x&comma;xA&comma;B

portx.q

srel

m

Relative distance from flange a to b

s_rel

vrel

ms

Relative velocity of flanges

v_rel

Connections

Name

Description

Modelica ID

portA

Hydraulic port

portA

portB

Hydraulic port

portB

flangea

Left flange of compliant 1-dim. translational component

flange_a

flangeb

Right flange of compliant 1-dim. translational component

flange_b

Parameters

Basic Parameters

Name

Default

Units

Description

Modelica ID

Aa

1e1

m2

Effective area of piston - side A

Aa

Ab

8e2

m2

Effective area of piston - side B

Ab

d

0

Nsm

Piston viscous friction coefficient

d

End Cushions Parameters

Name

Default

Units

Description

Modelica ID

Use end cushions

false

 

True adds cushions to the cylinder and enables Lmax, Lmin, kc, and cc parameters

useEndCushions

Lmax

1

m

Maximum piston position

Lmax

Lmin

0

m

Minimum piston position

Lmin

kc

1·1010

Nm

End cushion stiffness

kc

cc

1·106

Nsm

End cushion damping

cc

See Also

Hydraulics Library

Linear Actuators