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John from PA

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Reply with quote  #16 
Quote:
Originally Posted by RustyCas
What does the good old-fashioned acceleration waveform look like?  A trend plot of Crest Factor would be visually alarming as well.


It is unfortunate but I think the that the Crest Factor function is underused.

I also note in the "old-fashioned waveform" that the trend has flattened or perhaps started to decline.  This is often seen when you are very near the end of life of the bearing.  The bad thing at this stage is damage is so severe that the root cause may be difficult to determine.  Secondary damage should also be considered.  In a gearbox for instance, allow a distressed bearing to run too long and you raise the possibility of destroying the gearing.     
RustyCas

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Reply with quote  #17 
I’ve always used Max Peak Acceleration and Crest Factor trends in my monitoring. Simple and ‘real’ parameters and you don’t have to be a vibration guru to understand what they mean. I never really caught on to PeakVue because none of my customers would have any idea what it meant. It’s a good technique for diagnosis but not for reports or explanation, unless your audience is other vibration people, IMO. For run-of-the-mill equipment bearings, I still don’t see the need for PeakVue and similar.
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"The trend is your friend"
spciesla

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Reply with quote  #18 
When I was running the walk around program at a power plant, I implemented crest factor in my measurement configurations.  However, I don't recall catching anything that I didn't see or alarm on from the acceleration timewaveforms.   Fundamentally, I think it is a good parameter and I like the idea of including its trend in a report to illustrate a degrading condition.
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