how can i change the natural frequencies of a centrifugal fan other then adding weights?

 

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Alain Raad

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Original Post

Your question is very broad, what data do you have to support their is a natural frequency issue? What type/design is your fan

What part of the fan has the natural frequency issue?

Shaft

Fan wheel

Fan base

Fan housing/inlet cone

Supporting structure

 

To shift a natural frequency you need to know which frequency you are moving, adding mass will lower the natural frequency, adding stiffness in the right locations will raise it. Other fixes are to change the operating speed or add cork/rubber/springs to dampen vibration.

 

Dave

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