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Where Does Twice-Line-Frequency Vibration Come From?

Where Does Twice-Line-Frequency Vibration Come From?

Learning Point Takeaways:

1) What is the origin of the twice-line-frequency vibration peak?
2) What types of faults are indicated by the appearance or growth of that peak?
3) How misalignment and other faults can be misdiagnosed if the resolution is insufficient.