Good afternoon, I would appreciate sharing information about when to change a bearing? I commented that we have a company that monitors the condition of the bearings and in their vibrational analysis reports they only analyze the acceleration envelope spectra and have placed as alarm limits of SKF Acceleration Envelope.
We have disassembled the bearings that supposedly had wear detected by the Acceleration Envelope and no anomaly was found.
I will appreciate your technical comments.
Why do they use only or report only the use acceleration enveloping for analysis and making decisions on faults?
Would it not be better to use velocity as the main source of analysis and the making of a decision to replace the bearing?
Sounds like someone might be making the wrong choice in their choice of units, Fmax, Resolution, type of final analysis, etc.
Do they not collect conventional data using velocity units rather than using a possible filtering system of analysis with a high frequency filtered nature, if that is what you are calling the "acceleration enveloping" data.
In my opinion and based on what you have said, whoever is doing the collecting of the data and the analysis of the data might have been mislead by someone during a training class or instruction class or introduction class, in the art of condition monitoring and analysis of data.
You mention assigning "alarms limits". Are they going by these alarm limits to make the calls from?
There are numerous theories floating around in the world on how to do analysis, some work and some seem to fall short of working. I think I would seek a second opinion on the reports being issued by the provider.
Just my opinion and I could be totally wrong.
Thanks and Have a Great Day,