Disc Material and Vibration: Which Causes Higher Vibration, Iron or Aluminum?

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    Disc Vibration
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SUMMARY

The discussion centers on the comparison of vibration levels produced by two rotating discs made of different materials: iron and aluminum. Both discs are identical in size and thickness, rotating at the same RPM with a uniform mass distribution. The key conclusion is that the aluminum disc generates lower vibration levels compared to the iron disc due to its lighter mass, which results in less inertia and reduced vibrational energy transfer during operation.

PREREQUISITES
  • Understanding of rotational dynamics
  • Knowledge of material properties (specifically density and mass)
  • Familiarity with vibration measurement techniques
  • Basic principles of angular momentum
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  • Research the effects of material density on vibration in rotating systems
  • Explore vibration analysis techniques using accelerometers
  • Study the principles of dynamic balancing in rotating machinery
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Mechanical engineers, materials scientists, and anyone involved in the design and analysis of rotating machinery will benefit from this discussion.

Honza
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Hi all,

I´m sorry for my sort of trivial issue to solve. Anyway, imagine two discs rotating at the same rpm. They are the same size - same radius, same thickness. The mass is ideally distributed around the axis, so there is originally no disbalance. One of the disc is made of iron, the second one is aluminum so there is significant difference between both mass. Each disc is placed on ideal shaft in bearings. I put exactly the same weight on the same radius and i measure vibration in radial direction. What´s the result? Do i measure higher/lower vibration on iron or aluminum disc?

Thanks
 
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why do you expect vibration? the discs may slow down but why would they vibrate?
 
Sorry for my terrible explanation. It´s steady state situation. Both discs are spinning with the same weight attached at the constant angular velocity.
 

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