Calculating Shaft Natural Frequency in Free Air and Liquid

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SUMMARY

The discussion focuses on calculating the natural frequency of mixer shafts in both free air and liquid environments. It highlights that literature predominantly covers calculations in free air, with limited resources addressing the damping effects of liquid on natural frequency. The consensus is that if a mixer shaft may operate in low liquid conditions, calculations should prioritize air scenarios to ensure safety and performance under worst-case conditions.

PREREQUISITES
  • Understanding of natural frequency concepts
  • Familiarity with fluid dynamics principles
  • Knowledge of damping effects in mechanical systems
  • Experience with shaft design and analysis
NEXT STEPS
  • Research methods for calculating natural frequency in liquid environments
  • Explore damping effects on mechanical systems in fluid dynamics
  • Study worst-case scenario analysis for mixer shaft operations
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Mechanical engineers, fluid dynamics specialists, and professionals involved in the design and analysis of mixing equipment will benefit from this discussion.

Christoffer28
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Hello Fellow members.

In many litterature about mixing liquids in tanks, they describe how to calculate the natural frequency of shafts in free air.
But i have only found one book that describe about natural frequency of shafts in liquid, and it should have a damping effect of the natural frequency.

The question is: What is the best method? to calculate the frequency in free air or in liquid?Thanks in advance.
Christoffer
 
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Welcome to PF.

Christoffer28 said:
What is the best method? to calculate the frequency in free air or in liquid?
If the mixer shaft might be operated, even only once, while there is no, or low, liquid in the tank, then it must be calculated for air.
 
Ok, so its a question of dimensioning a worst case scenario.

Thanks for the answer :)
 

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