Slip Ring Noise
Slip Ring Noise
(OP)
I want to use a slip ring to carry vibration data from the end of a rotor mounted on a slightly unbalanced shaft but have some reservations as I've seen other posts mentioning slip ring noise contaminating data.
I'm considering the Moog model AC6231. They claim acceptably low noise levels during normal operation up to 2500rpm, but have not been able to comment on the vibration threshold that will cause their slipring to begin to perform out of spec.
Can you comment on the performance of this component or other slip rings that have been used in vibration?
Thanks
M
I'm considering the Moog model AC6231. They claim acceptably low noise levels during normal operation up to 2500rpm, but have not been able to comment on the vibration threshold that will cause their slipring to begin to perform out of spec.
Can you comment on the performance of this component or other slip rings that have been used in vibration?
Thanks
M





RE: Slip Ring Noise
A quick look at the specs online indicates that this is for high current. I doubt that this type of slip ring is appropriate for carrying 100 mv AC instrument signals. You can keep looking for an instrument-grade slip ring, but I would use telemetry instead.
Walt
RE: Slip Ring Noise
ISZ
RE: Slip Ring Noise
If you have a particular telemetry module to recommend, I'd love to take a look at it as a starting point.
I'm looking for at least 4 channels sampling @ 10kHz
Best
RE: Slip Ring Noise
-longevity of test, sensors in oil/water, self powered, number of channels, etc.
ISZ
RE: Slip Ring Noise
We once instrumented parts that were failing from fatigue during our multi-step shop processing. One of the processes had the part being faced in a manual lathe. After a bit of debate, we ended up taking strain gage data directly out the tailstock of the lathe on about 12-15 feet of instrument wire, which we held in "gentle tension" while the lathe spooled up to 1000 rpm, did a 50-60 second cut, and stopped. The winding of the wire was then "undone" by reversing the lathe. Worked very well, the data was clean, and only a slow thermal shift (DC bias) that we had to correlate out later.
RE: Slip Ring Noise
I don't think I'd recommend that approach in general!
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Slip Ring Noise
ISZ
RE: Slip Ring Noise
You must have used a pickup truck for the chase vehicle, so that a guy in back could pay out the extension cord?
:)
RE: Slip Ring Noise
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Slip Ring Noise
However, the duration of this test may be short, so I might consider the "gentle tension" with a long wire method when I need to add another data channel to my 4-channel slip ring.