Where to find
Where to find
(OP)
Torsional vibration measuring equipment?
I googled and can find plenty of services but nothing to purchase.
I googled and can find plenty of services but nothing to purchase.
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RE: Where to find
We tend to drill and tap into casings and then target inductive probes at gear teeth. Using (very) interesting signal proessing techniques, we can resolve angular motion higher than tooth-passing frequency. All you need is some (cheap) inductive probes, a suitable A/D converter and something like Matlab or its clones.
Other methods involve fitting shaft encoders, but (I think) that's over-kill.
- Steve
RE: Where to find
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RE: Where to find
TV analysis of toothed wheel data is a bit more tricky - the only commercial analyser I've seen is a steam powered device from the 50s. I'd guess Ono Sokki make something more modern.
What you are actually looking for is an FM demodulator with appropriate frequency ranges. It would be a fairly trivial Matlab script.
Cheers
Greg Locock
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RE: Where to find
Polytec has a similar device that I have never used. Here is a link to their website: http://www.polytec.com/usa/158_423.asp
If you want to go the encoder route Phil Copp makes a little 9 volt battery powered demodulator. The encoder signal can be created as described by SomptingGuy, or you can use your imagination to get equally spaced pulses using an optical pickup. Phil's website is: http://www.copp-tek.com/.
Phil also has a calibrator available for purchase for his device.
There is also a device from Ono-Sokki.
h
I hope this helps!
http://www.machinerywatch.com
RE: Where to find
If you have access to the drive train elements, probably, you can also use strain gauge & telemetry based torque sensors, and do dynamic measurement of torque. This could also provide information on the torsional vibrations.
More details, look into http://www.binsfeld.com
Goodluck
Jeyaselvan
RE: Where to find
And what about magnetic pickups and reluctor wheels, and output to a dual trace scope? Would it be accurate?
Similar to one of the links. And thanks a bunch for the links.