When reviewing results of vibration analysis, vibration at a bearing occurs at the same frequency as the motor rpm, with a displacement in the radial direction that is twice that of the axial direction. Which of the following could this indicate?
• Difference between axial and radial vibration components • Typical vibration signatures of unbalance, bent shaft, looseness, and rubbing • What it means when vibration occurs at 1x running speed (same as motor rpm)
• Which fault conditions usually show strongest motion radially rather than axially? • For a bent shaft, how would the shaft geometry make the bearing move (mainly axial, mainly radial, or a mix)? • For looseness or rubbing, would you expect vibration only at 1x rpm, or additional harmonics (2x, 3x, etc.)?
• Confirm that the vibration frequency is exactly 1x motor rpm (not 2x or multiple harmonics). • Note that radial displacement is twice axial; think which defect mainly throws mass outward from rotation center. • Review standard vibration-fault tables that link 1x rpm radial-dominant vibration to a specific common fault.
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