4.3X??
4.3X??
(OP)
Recently I viewed a series of acoustic spectra that clearly showed a 4.3 X speed series of peaks, with the speed varied over a 10X range (50 - 500 RPM). Rotary device was a BLDC motor/flywheel combo, riding on a pair of angular contact bearings, roughly 1.25 inches OD.
Is this a bearing harmonic (perhaps precessing, sp?)?
BK
Is this a bearing harmonic (perhaps precessing, sp?)?
BK





RE: 4.3X??
Do you have bearing part number (to check bearing fault frequencies?)
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RE: 4.3X??
BK
RE: 4.3X??
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Eng-tips forums: The best place on the web for engineering discussions.
RE: 4.3X??
- OD 1.2598 inches (32 mm)
- ID 0.5906 " (15 mm)
- W 0.3543 " ( 9 mm)
There are 11 balls, ref size being 3/16" (4.75 mm)
After I re-examined the data, the series of peaks appears to be closer to 4.4 X.
BK
RE: 4.3X??
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: 4.3X??
To compute the exact frequency, you also need contact angle.
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RE: 4.3X??
BK