id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
3440	Mixed system detection	Niklas Worschech	somebody	"Using the MSL mass with stop and friction with a force (see example below), Dymola detects a mixed system, which is handled as nonlinear system in OpenModelica. When looking at the equations, there is one linear equation, which depends on a boolean variable. Is there a mixed system detection and handling in OpenModelica? 

model TestModel
  Modelica.Mechanics.Translational.Components.MassWithStopAndFriction
  massWithStopAndFriction(m=1);
  Modelica.Mechanics.Translational.Sources.Force force;
  Modelica.Blocks.Sources.Sine sine;

equation 
  connect(force.flange, massWithStopAndFriction.flange_a);
  connect(sine.y, force.f);

end TestModel;
"	defect	new	critical	Future	Backend	trunk		mixed system	Nils Menager Lennart Ochel Willi Braun