Steady State Dynamics - noise in plot

[Disla]

I’m getting a clean curve.
I had to fix the Boundary card adding an extra coma. There was displacements into x and y components.

@TB2000

It kept failing as it said i didn’t have an elastic restraint condition for the mass

I have experience this before and solved it by accident. Check this post. Solution seems to be adding a solid dummy element.

DAMPING should be preceded by a *MATERIAL card

Thanks to both of you, I was preparing the proposal of the cube at the tip and …surprise. If a dumb cube is added to the system the matrix is assembled and the problem is solved with the springs. I am referring to a loose cube. I have yet to see if the result makes sense but it is surprising isn’t it?:joy: [imagen]

EDITED: I suspect eigensolver can’t solve a problem with just one mode.