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Navigation: Library > Iconic Diagrams > Hydraulics > Cylinders > cylindersingle |
  
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Iconic Diagrams\Hydraulics\Cylinders
Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Hydraulics/Translational).
This is the extended model of a single acting cylinder with mass, friction and end stops.
The volume of the chamber is given by:
V = Vdead + Aa*(x + x_initial)
with Aa the piston area, x the piston position and Vdead the initial volume when piston position is zero. The piston area Aa is related to the piston diameter dp by:
Aa = pi * dp^2 / 4
The travel of the piston is restricted. At the cylinder heads two collision models prevent the piston from traveling any further. The friction between the piston and the cylinder walls is modeled by static and viscous friction.
Ports |
Description |
pa p_barrel, p_rod |
hydraulic port translation ports |
Causality |
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preferred pressure out pa preferred force out pm |
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Parameters |
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Vdead stroke x_initial dp m_barrel m_rod kc dc Fc dv slope |
rest volume of oil in cylinder chamber when closed [m3] stroke length [m] starting position of piston [m] piston diameter [m] barrel mass [kg] rod and piston mass [kg] stiffness during collision with cylinder heads [N/m] damping during collision with cylinder heads [N.s/m] static friction [N] viscous friction coefficient [N.s/m] steepness of the static friction curve [] |
When a the cylinder piston collides with the cylinder heads, simulation may get very slow or even become unstable. In these cases you are advised to use the BDF-method with default settings. Try to change the absolute integration error until a stable simulation is obtained!