maximum frequency of a rotor fan 1

[pippogarruz]

User's group

I m working on a centrifugal fan wheel and I'm studing the natural
frequency of the rotor. This rotor has a shaft with two bearing at the
ends. All the pieces are steel. The first shape is at 19Hz.
What is your opinion about the maximum velocity to avoid resonance
problem?

Thank you
Filippo Garuti
Italy

 

[GBor]

+/- 20% is a good "rule of thumb". + 20% and you have to know what will happen during start-up where you drive through the frequency. -20% would be better...Approximately 15 Hz (900 RPM).

Garland E. Borowski, PE