WOLFRAM SYSTEMMODELER

PartialLineForce

Base model for line force elements

Wolfram Language

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Click for copyable input
SystemModel["Modelica.Mechanics.MultiBody.Interfaces.PartialLineForce"]
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Information

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

All line force elements should be based on this base model. This model defines frame_a and frame_b, computes the 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;

Connectors (2)

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

Parameters (3)

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)

Components (1)

world

Type: World

Description: