A vibration analyst reviews an FFT spectrum on a large centrifugal fan running at 1800 RPM (30 Hz). There is a massive spike exactly at 1X running speed (30 Hz). What is the most likely mechanical fault?

Question

Accepted Answer

Mass unbalance of the fan rotor. A high vibration amplitude exactly at 1X turning speed is the classic signature of mass unbalance. The heavy spot causes one vibration peak per revolution.

Answer

Bearing inner race defect

Answer

Gear mesh failure

Answer

Cavitation

A vibration analyst reviews an FFT spectrum on a large centrifugal fan running at 1800 RPM (30 Hz). There is a massive spike exactly at 1X running speed (30 Hz). What is the most likely mechanical fault?

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