Damper

Linear (velocity dependent) damper

Information

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

Linear damper acting as line force between frame_a and frame_b. A force f is exerted on the origin of frame_b and with opposite sign on the origin of frame_a along the line from the origin of frame_a to the origin of frame_b according to the equation:

f = d*der(s);

where "d" is a parameter, "s" is the distance between the origin of frame_a and the origin of frame_b and der(s) is the time derivative of "s".

In the following figure a typical animation is shown where a mass is hanging on a damper.

Parameters (8)

s_small	Value: 1e-10 Type: Distance (m) Description: Prevent zero-division if distance between frame_a and frame_b is zero
fixedRotationAtFrame_a	Value: false Type: Boolean Description: = true, if rotation frame_a.R is fixed (to directly connect line forces)
fixedRotationAtFrame_b	Value: false Type: Boolean Description: = true, if rotation frame_b.R is fixed (to directly connect line forces)
useHeatPort	Value: false Type: Boolean Description: = true, if heatPort is enabled
T	Value: 293.15 Type: Temperature (K) Description: Fixed device temperature if useHeatPort = false
animation	Value: true Type: Boolean Description: = true, if animation shall be enabled
d	Value: Type: TranslationalDampingConstant (N·s/m) Description: Damping constant
length_a	Value: world.defaultForceLength Type: Distance (m) Description: Length of cylinder at frame_a side

Inputs (5)

diameter_a	Default Value: world.defaultForceWidth Type: Diameter (m) Description: Diameter of cylinder at frame_a side
diameter_b	Default Value: 0.6 * diameter_a Type: Diameter (m) Description: Diameter of cylinder at frame_b side
color_a	Default Value: {100, 100, 100} Type: Color Description: Color at frame_a
color_b	Default Value: {155, 155, 155} Type: Color Description: Color at frame_b
specularCoefficient	Default Value: world.defaultSpecularCoefficient Type: SpecularCoefficient Description: Reflection of ambient light (= 0: light is completely absorbed)

Connectors (3)

	frame_a	Type: Frame_a Description: Coordinate system a fixed to the component with one cut-force and cut-torque
	frame_b	Type: Frame_b Description: Coordinate system b fixed to the component with one cut-force and cut-torque
	heatPort	Type: HeatPort_a Description: Optional port to which dissipated losses are transported in form of heat