calculation of a radial bearing whose fluid medium is pressurized?

[cbrn]

Hi,
I've got a runner-in-housing assembly which behaves kind like a radial bearing, whose fluid medium is water.
The fact is that this water is pressurized, i.e. the average pressure inside the "bearing" at rest is not zero.
Does this pressure have an influence on the static behavior of the bearing under load, or will the bearing behave just like if the fluid medium was not pressurized?

I believe it doesn't make any difference, but my application is somewhat critical and I'd prefer to be really sure about this point...
I don't know if I have been clear... Don't hesitate to ask me for other clarifications...

Thanks in advance !
Regards

 

[badservo]

Please don't double post.

Other post here

http://www.eng-tips.com/viewthread.cfm?qid=300793&page=1

 

[cbrn]

It's in order to maximize the possibility to get an answer in times compatible with the design of this component... knowing that the "Bearings Design" forum is not very active...

Sorry, thanks

 

[asimpson]

I'm assuming this is a fluid bearing?

http://en.wikipedia.org/wiki/Fluid_bearing

If so, no pressure and you get solid contact between bearing surfaces. Even in static conditions this could cause damage to surfaces which have to be precise. Depends on application and bearing.

 

[IRstuff]

If nothing else, pressurization of the fluid operates against any preload doesn't it?

TTFN

FAQ731-376
Chinese prisoner wins Nobel Peace Prize

 

[electricpete]

I provided my comments in the other thread.

To my perspective there is no effect. For given conditions of loading, geometry, fluid, the pressure solution given by the differential equations will be satisfied by a group of equations with an arbitrary additive constant (if you take the solution and add any constant pressure P0 to all points in space, the solution still satisfies the differential equation.). Also of course if you add any constant pressure P0 to all points in space, there is no change to the force on the shaft since the sum of P0 acting around the circumference of the shaft is 0. All that is left is change in fluid parameters (viscosity) with pressure as far as I can see.

Now if the source of pressure involved axial flow through bearing, that might be a different discussion.

=====================================
(2B)+(2B)' ?

 

[electricpete]

If nothing else, pressurization of the fluid operates against any preload doesn't it?

can you explain what you mean?

=====================================
(2B)+(2B)' ?

 

[cbrn]

Hi,
thanks to all for your attention, and sorry again for the double post.
I replied to Electricpete and WCFoiles in the other thread, let's continue the discussion there (Bearing Design forum) so the moderators won't ban me ;-)
Thank you again, your comments are very precious for me!