Simscape Multibody: Rigid Transform changes System Output

I'm using the extrude function to extrude a solid in Simscape Multibody which is connected to a prismatic joint. The equilibrium position is calculated, so that the solid doesn't move in the beginning. Since the extrusion is in z-axis but I want the extrusion in y-axis, I first perform the extrusion and then use a rigid transform block rotating +X, 90deg. However, when I use the rigid transformation the solid moves. When I don't use it, it doesn't. I attatched a simple example of the model. Just run it and check the scope.

Any ideas what happend and why the solid moves when using the rigid transformation?

Thanks!

Answer 1

[Steve Miller]

Hi Jan,

I see what you see on the Scope. One solid appears to be moving sinusoidally and the other not at all. However, if you look at the y-axis on the Scope, you will see that the amplitude of the movement is 1e-16 meters. This is not moving at all as the magnitude is essentially as close to zero as the computer can represent.

--Steve