Damper

Linear damper: f = d·v_rel.

  • translational
  • Modelica Standard Library
  • 2 ports
  • 1 parameter
BlockDamperKindtransDamperLibraryTranslational

Description

A linear viscous damper between two translational flanges: the force is proportional to the relative velocity. Connect it to Fixed (translational) for drag against the frame.

Example

Mass, spring, and damper Two 1 kg masses on 100 N/m springs and 2 N·s/m dampers, pushed by 1 N, with every translational sensor.

Force step 1 NApplied forceMass 1 kgSpring-damperWallPositionVelocityAccelerationForce 1 NMass 1 kg (lower)Spring 100 N/mDamper 2 N·s/mWall (lower)Spring compressionPosition (lower)
In Gradara, select a Damper block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:Fixed (translational)MassSpringSpring-damperConstant forceForce stepPosition sensorVelocity sensorAcceleration sensor (linear)Force sensorRelative position sensor

Ports

Conserving terminals 2

  • aflange_atranslational

    Flange a. Receives −f.

  • bflange_btranslational

    Flange b. Receives f, the damping force.

Parameters

  • Dampingd10 N·s/m

    ≥ 0

    Damping coefficient, in N·s/m. Zero or positive.

Equations

Modelica
v_rel = d(flange_b.s − flange_a.s)/dt
f = d · v_rel
flange_b.f = f, flange_a.f = −f

Implementation

Modelica Standard Library 4.1.0Modelica.Mechanics.Translational.Components.Damper
MSL documentation

Assumptions and limitations

  • Purely viscous: no Coulomb friction or stiction.

Used in

These larger examples use it too. Open them from Examples in the app.

  • EV drivetrain

See also

Select a block in Gradara and press F1 to open its page offline.