This information is part of the Modelica Standard Library maintained by the Modelica Association.
A flange is described by the connector class Interfaces.Flange_a or Interfaces.Flange_b. As already noted, the two connector classes are completely identical. There is only a difference in the icons, in order to easier identify a flange variable in a diagram. Both connector classes contain the following variables:
Modelica.SIunits.Position s "Absolute position of flange"; flow Modelica.SIunits.Force f "Cut-force in the flange";
If needed, the velocity
v and the
a of a flange connector can be
determined by differentiation of the flange position
v = der(s); a = der(v);