Understanding Rotational Stability of Long Axles: Theory and Analysis

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SUMMARY

The discussion focuses on the rotational stability of a 5-meter long axle, specifically addressing the maximum allowable rotational speed and the theory behind it. Key concepts include "shaft whirling" and "critical speeds," which are essential for understanding the dynamics of long axles. The user has conducted a Finite Element Method (FEM) analysis using SolidWorks but seeks verification through analytic calculations. It is emphasized that results from non-rotating buckling analyses are not applicable to this scenario.

PREREQUISITES
  • Understanding of rotational dynamics and stability principles
  • Familiarity with "shaft whirling" and "critical speeds" concepts
  • Proficiency in SolidWorks for FEM analysis
  • Knowledge of analytic methods for stability calculations
NEXT STEPS
  • Research the theory of "shaft whirling" and its implications on axle stability
  • Learn how to perform critical speed calculations for long axles
  • Explore advanced FEM techniques in SolidWorks for rotational stability analysis
  • Study analytic methods for verifying FEM results in structural stability
USEFUL FOR

Mechanical engineers, structural analysts, and anyone involved in the design and analysis of rotating machinery, particularly those focused on axle stability and 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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