Reply To: Rotation velocity in static structural

[javat33489]

Thank you for your answers sir.
I have one more question, the last one.
After I give such a calculation in the static module, with fixings as I said:

Sir, I set the rotation on the wheel, I set the contact between the wheel and the shaft without friction, and so that the wheel does not fly into space, I made a joint between the wheel and the shaft to rotate. Is this wrong? I need to understand how the shaft will behave when the wheel rotates on it

Then I make a modal analysis from the static (pressure stress) this is necessary to understand the first mode, for seismic calculations.
But for some reason it is the wheel that shows mode 0. As if it is not fixed, could this be due to rotation? Why is that?