WOLFRAM SYSTEMMODELER

SpringDamperSeries

Linear spring and linear damper in series connection

Wolfram Language

In[1]:=
Click for copyable input
SystemModel["Modelica.Mechanics.MultiBody.Forces.SpringDamperSeries"]
Out[1]:=

Information

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

Linear spring and linear damper in series connection acting as line force between frame_a and frame_b:

  frame_a --> damper ----> spring --> frame_b
          |              |
          |-- s_damper --|  (s_damper is the state variable of this system)

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 equations:

   f = c*(s - s_unstretched - s_damper);
   f = d*der(s_damper);

where "c", "s_unstretched" and "d" are parameters, "s" is the distance between the origin of frame_a and the origin of frame_b. "s_damper" is the length of the damper (= an internal state of this force element) and der(s_damper) is the time derivative of s_damper.

Connectors (3)

frame_a

Type: Frame_a

Description: Coordinate system fixed to the force element with one cut-force and cut-torque

frame_b

Type: Frame_b

Description: Coordinate system fixed to the force element with one cut-force and cut-torque

heatPort

Type: HeatPort_a

Description: Optional port to which dissipated losses are transported in form of heat

Parameters (9)

s_small

Value: 1.E-6

Type: Position (m)

Description: Prevent zero-division if relative distance s=0

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

c

Value:

Type: TranslationalSpringConstant (N/m)

Description: Spring constant

s_unstretched

Value: 0

Type: Length (m)

Description: Unstretched spring length

d

Value: 0

Type: TranslationalDampingConstant (N·s/m)

Description: Damping constant

s_damper_start

Value: 0

Type: Length (m)

Description: Initial length of damper

Components (1)

world

Type: World

Description:

Used in Examples (1)

HeatLosses

Demonstrate the modeling of heat losses