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  • Users: JAF8871
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  1. JAF8871

    Increasing Vibration Peaks at 21,600 CPM

    I have two 1500 horsepower, 4160 volt, 900 rpm motors running from the same 60 hertz electrical supply. Both are exhibiting increasing peaks at 21,600 cpm. Line frequency and other harmonics of line frequency are present also but not as high and not increasing. Rotor bar peaks and two times...
  2. JAF8871

    FFT Bin content

    With an Fmin of 0 cycles per minute and an Fmax of 120,000 cycles per minute and 1600 lines, the FFT bin width is 75 cycles per minute. If there are multiple peaks that fall within a bin, which peak will be shown on the FFT spectrum? If there are other peaks within the bin, how dows one...

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