WOLFRAM SYSTEMMODELER

PartialLineForce

Base model for massless line force elements

Wolfram Language

In[1]:=
SystemModel["Modelica.Mechanics.MultiBody.Interfaces.PartialLineForce"]
Out[1]:=

Information

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

All massless line force elements should be based on this base model. This model defines frame_a and frame_b, computes the (guarded) relative distance s and provides the force and torque balance of the cut-forces and cut-torques at frame_a and frame_b, respectively. In sub-models, only the line force f, acting at frame_b on the line from frame_a to frame_b, as a function of the relative distance s and its derivative der(s) has to be defined. Example:

   model Spring
      parameter Real c "spring constant",
      parameter Real s_unstretched "unstretched spring length";
      extends Modelica.Mechanics.MultiBody.Interfaces.PartialLineForce;
   equation
      f = c*(s-s_unstretched);
   end Spring;

Parameters (3)

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)

Connectors (2)

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

Components (1)

world

Type: World

Extended by (3)

SpringDamperSeries

Modelica.Mechanics.MultiBody.Forces

Linear spring and linear damper in series connection

SpringDamperParallel

Modelica.Mechanics.MultiBody.Forces

Linear spring and linear damper in parallel

Damper

Modelica.Mechanics.MultiBody.Forces

Linear (velocity dependent) damper