sound level from air bearings?
sound level from air bearings?
(OP)
dear all,
we are in need to develop an ultra quiet test setup for an equipment, meaning maximum isolation from any source of mechanical disturbance.
We were thinking about deploying air bearings as supports, but we were also wondering about the eventual sound level generated by the airstream flowing into the bearing, and it's eventual spectrum distribution.
Anybody has information in this sense?
Thanks a lot in advance,
Edo
we are in need to develop an ultra quiet test setup for an equipment, meaning maximum isolation from any source of mechanical disturbance.
We were thinking about deploying air bearings as supports, but we were also wondering about the eventual sound level generated by the airstream flowing into the bearing, and it's eventual spectrum distribution.
Anybody has information in this sense?
Thanks a lot in advance,
Edo





RE: sound level from air bearings?
TTFN
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RE: sound level from air bearings?
The point is that we need to microvibrate our equipment along a given direction, within a few micrometer resolution. We need to avoid any additional movement component.
Air dampers would anyhow "shake" the test rig, introducing lateral or rotational undesired movements
therefore we need something really stiff as linear guide, avoiding to have side effects (e.g. linear guides based on rolling bearings would introduce the ball bumps, teflon guides would anyhow introduce static friction induced vibrations, and so on). that's why we were reasoning on air bearings.
Any information on the sound level produced by air bearings?
thanks a lot,
Edo
RE: sound level from air bearings?
Ballbearing systems are successfully used in higher performance designs. There are gimbals with better than 10 urad rms jitter stabilization using precision spherical bearings.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: sound level from air bearings?
the vibration ranging up to 1000 Hz. The control based on spectral amplitude.
We experienced with rolling bearings microvibrations generated by the spheres and slight lateral pushs. but maybe we could have some more accurate rolling bearings?`
thanks for your suggestions,
Edo
RE: sound level from air bearings?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: sound level from air bearings?
And as you mentioned, trying to have all the push/pull force centered in the baricentre.
you still think this is stupid?
Do you know commercial vibration controllers that are able to control your inertia movement up to 1000 Hz with tight accuracy?
Thanks,
Edo
RE: sound level from air bearings?
the vibration ranging up to 1000 Hz. The control based on spectral amplitude.
We experienced with rolling bearings microvibrations generated by the spheres and slight lateral pushs. but maybe we could have some more accurate rolling bearings?`
thanks for your suggestions,
Edo
RE: sound level from air bearings?
I realise that is not much help but might form the basis of an experiment.
Cheers
Greg Locock
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RE: sound level from air bearings?
thanks for this tip, this is really giving at least a starting point to assess my point of view :)
merci,
Edo