Understanding Rotational Stability of Long Axles: Theory and Analysis

AI Thread Summary
The discussion centers on the rotational stability of a long, thin axle, specifically seeking to determine the maximum allowable rotational speed for a 5-meter axle. It highlights the importance of understanding shaft whirling and critical speeds in this context. The original poster has conducted a FEM analysis in Solidworks but seeks verification through analytical calculations. Participants emphasize that results from non-rotating buckling analyses will not be applicable for this scenario. Accurate analysis requires specialized procedures tailored to rotational dynamics.
Kajdosan
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Does anyone know the theory behind rotational stability of a (long, thin) axle? I would like to know the maximum allowable rotational speed of a 5 meter long axle. I suppose its something in line with the theory of column stability, but I can't find anything about it.

I have made a FEM analysis in Solidworks, but I have no idea how its computed and whether its reliable. So I would like a verify it with an analytic calculation to compare.

Can anyone guide me in the right direction I would appreciate it very much.

Thanks

Kaj
 
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The key words are "shaft whirling" and "critical speeds".

If your software can analyze this, there will almost certainly be a special solution procedure for it. Any results that you might get from a non-rotating buckling analysis will be meaningless.
 

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