This information is part of the Modelica Standard Library maintained by the Modelica Association.

Test of a system with 2 cylinders (with same volume):

• cylinder1: A = 0.1 m2, L=10. m, initial position of piston at s=L/2
• cylinder2: A = 1.0 m2, L=1.0 m, initial position of piston at s=L/2

A force is applied that presses from 0.25 s to 0.50 s with 1 Nm on piston1. Due to the ratio of areas 10:1

• the force at piston2 is ten times the force at piston1
• movement of piston1 is ten times the movement of piston2

At piston2 a mass is mounted which is moved and presses the springDamper. When the force at piston1 is removed, the springDamper pushes back the mass and a damped oscillation occurs.

Note: Take care of the initial conditions. The unstretched spring length is cylinder2.L/2, i.e. when piston2 is the middle of its cylinder the spring applies no force to the mass (and piston2).

f1	Default Value: -10 * cylinder1.f Type: Force (N) Description: 10 x Force on piston 1
s1	Default Value: 0.1 * cylinder1.s Type: Position (m) Description: 0.1 x Position of piston 1
s2	Default Value: cylinder2.s Type: Position (m) Description: Position of piston 2
f2	Default Value: -cylinder2.f Type: Force (N) Description: Force on piston 2
f	Default Value: springDamper.f Type: Force (N) Description: Force of springDamper