Vibration analysis on rotor for specific RPM

[Anonymous]

Hi there,

I am very new to the Autodesk Inventor simulation platform. I am customizing the rotor of a machine that has various speed settings. Obviously, for different customized 3D parts (the rotor), there will be different axial vibration at different speeds. I have also noticed this experimentally which tells me that at 700 and 3500 rpm, the rotor experiences higher vibration. I have watched some answers in the forum that informed me that we can measure the natural frequency using modal analysis.

So what I did is I made two separate parts, one for the motor shaft and the other is the customized rotor itself. But I really don't have any idea about what constraints to use to define that the customized part rotates around the shaft. One idea could be to use a rotational joint between the shaft and rotor. But what constraint I should give to define the shaft and rotor? Also I don't know how to provide the constraint for a specific speed like 4000 rpm. Or a range of speed like 0-4000 rpm. So that the analysis could show me the possible axial vibration at certain speeds.

I am sure people worked with this kind of simulation before. Any help would be highly appreciated.