Re: Vibration Information
What are you trying to accomplish?
Re: Vibration Information
Hi,
I`ve done a bit of vibration and shock pulse analysis on air compressors (not the same as `fridge ones I know but the same principle). If I can`te get the manufacturers info` on bearings, and rotor speeds etc I go by what I can find on the machine ie drive shaft size and speed and, dare I say it, guess the bearing sizes. After all, it`s all about building a trend for each compressor`s dbm, dbc and vibration over a period of time.
Regards,
Glenn
Re: Vibration Information
Thanks. Trending is very important, however before we can establish a trend over time we have to report on current condition. The work we do is in the field so trending takes a while when we visit a customers site once a year or so. We use all the rules of thumb and manufacturers vibration limits when known, but we would like to identify certain frequencies that may indicate underlying problems.
We also guess bearing sizes etc, (use the non synchronous rule when trying to identify faults, etc) but with all the frequencies in a compressor actual information can really help.