From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page
Bearing Analysis
John Nicholas
Member
11-30-2000 07:43 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Can anyone help with evaluation Software/VI for analyzing roller bearing
defects using enveloping (demodulation) techniques.Some literature I have
describes Enveloping as " Envelope detection is a method for intensifying
the repetitive components of a dynamic signal to provide an early warning of
deterring mechanical condition" Any help/suggestions would be appreciated.
defects using enveloping (demodulation) techniques.Some literature I have
describes Enveloping as " Envelope detection is a method for intensifying
the repetitive components of a dynamic signal to provide an early warning of
deterring mechanical condition" Any help/suggestions would be appreciated.
PdB
Active Participant
12-28-2001 03:16 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
I learned that the envelope is the peak-to-peak value of an AC signal. An easy LabVIEW solution is to aquire the AC signal with a DAQ-board. Window and calculate the FFT. Find the dominant frequency and it's amplitude. Stripchart the amplitude gives you an envelope.
PdB@serenity.nl
PdB@serenity.nl
Labviewguru
Active Participant
12-28-2001 01:24 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
John,
I have extensive experience with bearing defect analysis! Big time.
Contact me, I can probably help. I am not familiar with the enveloping technique. I am mostly familiar with analysis using FFTs of vibration data from either an analysis machine such as a Schenck (great product, terrible company and price) or by using my own 1, 2, or 3 axis velocity or acceleration sensors (accelerations is superior for vibration analysis.)
I also got a hold of the formulae for determining what signals to look for for which defects (the frequency multipliers for which bearing elements.
The company I worked at had a very serious bearing wear issue, and I was able to determine a lotby analysis of these signals, done primarily in LabVIEW.
However; real bearn
ing analysis involves deltas over time of vibration (harmonics) signatures. By first determining what signals in the FFT correspond to what bearing feature (i.e. outer race defect, inner race defect, ball defect) you can then create a signature of each pattern. Analysis takes place over time. You can actually go back and calculate exact dimension change by looking at the frequency shift of the features of the FFT. For example, the degree to which your frequency shifts of your outer race, can actually be used to directly calculate the change in dimension of the outer race circumfrence/diameter...
I can be reached at labviewguru@nethere.com if you wish to discuss this further.
Good luck. I hope you have the success that my former company didn't (they never did listen to reason...)
I have extensive experience with bearing defect analysis! Big time.
Contact me, I can probably help. I am not familiar with the enveloping technique. I am mostly familiar with analysis using FFTs of vibration data from either an analysis machine such as a Schenck (great product, terrible company and price) or by using my own 1, 2, or 3 axis velocity or acceleration sensors (accelerations is superior for vibration analysis.)
I also got a hold of the formulae for determining what signals to look for for which defects (the frequency multipliers for which bearing elements.
The company I worked at had a very serious bearing wear issue, and I was able to determine a lotby analysis of these signals, done primarily in LabVIEW.
However; real bearn
ing analysis involves deltas over time of vibration (harmonics) signatures. By first determining what signals in the FFT correspond to what bearing feature (i.e. outer race defect, inner race defect, ball defect) you can then create a signature of each pattern. Analysis takes place over time. You can actually go back and calculate exact dimension change by looking at the frequency shift of the features of the FFT. For example, the degree to which your frequency shifts of your outer race, can actually be used to directly calculate the change in dimension of the outer race circumfrence/diameter...
I can be reached at labviewguru@nethere.com if you wish to discuss this further.
Good luck. I hope you have the success that my former company didn't (they never did listen to reason...)
arsi986
Member
07-21-2012 06:38 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Hi dear all,
I am arslan and trying to develop software using labveiw for diagnosis of ball bearing inner, outer and ball faults... i am using cepstrum technique...my problem is i have developed some what software and now i wanted to check my software through data files....As i dont have any experimental setup, so can any one provide me good noise free data of healthy, outer race, inner race and ball defect...the data should be in time domain and of single accerlometer....
It would be great help for me,
Regards,
Arslan
altenbach
Knight of NI
07-22-2012 12:53 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
