Vibration of FD fan

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PKS in Manama, Bahrain

113 months ago

FD fan with Journal Bearing of shaft 6" dia. is having 2 speeds. In 750 speed the maximum Vib at FDE H is 0.5 mm/s and at 1450 speed the vibration at same location is 10 mm/s. Recently the fan DE Bearing was replaced. The signature at high speed shows high Pk in 1x and the harmonics of 20-25 pks. Can you suggest what may be the possible cause of vibration.

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Tom in Ann Arbor, Michigan

103 months ago

the system is going in to resonance at 25 hz, try changing the mass of the fan or the stiffness of the shaft and shaft mounting system

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