I've seen bearing failure in "real time" which caused the shaft to abruptly stop at 4000 rpm during run-down. The so called "haystack" on the spectrum became very prominent prior to failure. We were relying only on spectrum magnitudes and no enveloping was being done. Another time when I saw an ISB failure, a few days prior to the event, the high rotor vibration dropped abruptly and the low rotor vibration spiked suddenly on the strip chart at the same instant.
Brilliant. Thank you.
I've seen bearing failure in "real time" which caused the shaft to abruptly stop at 4000 rpm during run-down. The so called "haystack" on the spectrum became very prominent prior to failure. We were relying only on spectrum magnitudes and no enveloping was being done. Another time when I saw an ISB failure, a few days prior to the event, the high rotor vibration dropped abruptly and the low rotor vibration spiked suddenly on the strip chart at the same instant.
Nicely done! Thorough and Straight Forward!
Glad you found this useful!
Thanks a lot, very informative.
You are welcome!
love from PAKISTAN
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