Cylinder

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Cylinder

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Iconic Diagrams\Hydraulics\Cylinders\Basic Cylinders

Use

Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Hydraulics/Translational).

Description

Cylinder

This is an ideal model of cylinder with no mass and no friction. The volume of the chambers is given by:

 

Va = Vdead + Aa*(x + x_initial)

Vb = Vdead + Ab*(stroke - x - x_initial)

 

with Aa the piston area and Ab the effective area at the rod side. x is the piston position and Vdead the initial volume when piston position is zero. The piston areas Aa and Ab are related to the piston diameter dp and rod diameter dr by:

 

Aa = pi * dp^2 / 4

Ab = pi * dp^2 / 4 - pi * dr^2 / 4

PistonDiameter

There is no restriction on the travel of the piston. Only a warning is given when the maximum stroke is exceeded or the piston position gets negative.

Interface

Ports

Description

pa, pb

pm

hydraulic port

translation port

Causality

 

preferred pressure out pa

preferred force out pm

 

Parameters

 

Vdead

B

stroke

x_initial

dp

dr

rest volume of oil in cylinder chamber when closed [N.s/m]

effective bulk modulus [Pa]

stroke length [m]

starting position of piston [m]

piston diameter [m]

rod diameter [m]