hello,
does anyone have a suggestion, why the following model iterates without finding a solution, even if it is validated successfully?

model try
  inner Modelica.Mechanics.MultiBody.World world annotation(Placement(visible = true, transformation(origin = {-71.5,15.5}, extent = {{-9.31382,-9.31382},{9.31382,9.31382}}, rotation = 0)));
  Modelica.Mechanics.MultiBody.Forces.Spring spring1(c = 100, s_unstretched = 20) annotation(Placement(visible = true, transformation(origin = {-22.5,15.5}, extent = {{-15,-15},{15,15}}, rotation = 0)));
  Modelica.Mechanics.MultiBody.Parts.PointMass pointmass1(m = 100) annotation(Placement(visible = true, transformation(origin = {16,15}, extent = {{-12.3967,-12.3967},{12.3967,12.3967}}, rotation = 0)));
  Modelica.Mechanics.MultiBody.Forces.WorldForce worldforce1 annotation(Placement(visible = true, transformation(origin = {-9.5,65.5}, extent = {{-15,-15},{15,15}}, rotation = 0)));
  Modelica.Blocks.Sources.Constant[3] constant1(k = {10,0,0}) annotation(Placement(visible = true, transformation(origin = {-71.5,80}, extent = {{10.1526,10.1526},{-10.1526,-10.1526}}, rotation = -180)));

equation
  connect(constant1.y,worldforce1.force) annotation(Line(points = {{-82.6678,80},{-29.5,80},{-29.5,65.5},{-27.5,65.5}}));
  connect(pointmass1.frame_a,worldforce1.frame_b) annotation(Line(points = {{16,15},{16.5,15},{16.5,65.5},{5.5,65.5}}));
  connect(spring1.frame_b,pointmass1.frame_a) annotation(Line(points = {{-7.5,15.5},{15.5,15.5},{15.5,15},{16,15}}));
  connect(spring1.frame_a,world.frame_b) annotation(Line(points = {{-37.5,15.5},{-56.5,15.5},{-56.5,15.5},{-62.1862,15.5}}));
end try;