Machinery Vibration

The vibration of rotating machinery may infer certain defects. The spectrum of the vibration can also be used like a finger print.

FrequencyPossible causes
1 x operating speed
Imbalance
Misalignment
Bent shaft
Looseness
Electrical
2 x operating speed
Misalignment
Bent shaft
Harmonics of operating speed
Loose mounts
Loose bearing caps
Subharmonics of operating speed
Oil whirl
Bearing cage defects
Non-integer multiples of operating speed
Rolling element bearings
Gears
Belts
Blades
Vanes
Powerline frequency harmonicsElectrical

See also: Vibration.

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Subjects: Mechanical Engineering Noise & Vibration