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Danny Harvey

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Reply with quote  #1 
SKF uses 4 filters for its gE demod readings: 300-6 kcpm, 3k-60k cpm, 30k-600k cpm and 300k-2.4 mcpm.

Do these filter out everything but what is between the two numbers or do they include on what is between them?
skfboiler

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Reply with quote  #2 
Using the the 3rd filter, 30k-600k for example, signals below 30k will be filtered out and signals above 600k will be filtered out.  This 3rd filter is probably the most useful filter using the SKF version of this technology.  This filter will even work on slow speed equipment.  However, the other three filters should still be experimented with to determine which gives the better results.  Keep in mind if using a 500 mv/g sensor pay special attention the specs.  The roll off of this sensor may not be in the range of the 3rd band pass filter and therefore poor results will occur.  Therefore on slow speed machines a typical 100mv/g sensor will be the preferred sensor to use.

I attached a document on how to use the SKF Enveloping technique.

pdf SKF Acceleration Enveloping and Other Bearing Defect Detection Methods.pdf     

MarkL

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Reply with quote  #3 
Thanks for that SKF Boiler, that was very informative, dont suppose you have links to the spreadsheet mentioned for gE calculation? also what is the Atlas software? I am a Skf vendor and havent come across it.
OLi

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Reply with quote  #4 
Atlas is thefirst prehistoric bearing database I guess the same you get in your phone app for free. Once bearing data was propriety info. Olov
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MarkL

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Reply with quote  #5 
Thanks for that Olof, so I presume its something for history books now? I have a few apps on my phone alright for bearing defect freq's etc, Guess this is where they came from ? 
OLi

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Reply with quote  #6 
Sort of, CSI actually had all users to send in bearing info so that is a reason why same bearing may have different numbers as they were produced in different factories. Olov
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Jorge Luis

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Reply with quote  #7 
Mr. Skfboiler:
Good evening, you can not download the article SKF Acceleration Enveloping and Other Bearing Defect Detection Methods.pdf
MarkL

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Reply with quote  #8 
Quote:
Originally Posted by Jorge Luis
Mr. Skfboiler:
Good evening, you can not download the article SKF Acceleration Enveloping and Other Bearing Defect Detection Methods.pdf


I just tried it again there now and works fine for me. 
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