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I am looking at a problem where there is essentially a hydraulic cylinder containing a double acting type rod (with an annulus). There will be some holes in the annulus, which will allow fluid to pass through once there is a load on the end of the rod causing it to extend. The fluid in the cylinder is totally closed in by the bounds of the cylinder (diameter and ends). There is a shear pin holding the rod in a close position until it is loaded.

Given the force applied i am trying to get my head around how to determine how much damping there will be. i.e, if a force of 10kN acts to pull the rod out, what will be the force seen in the ram. I think that the influencing factors will be the viscosity of the fluid, load applied, size of holes in annulus, diameter of cylinder, diameter of rod. the stroke of the cylinder will determine the duration of damping.

I'm not asking for anyone to solve the problem for me, as i haven't supplied enough information, but i wanted to get pointed in the right direction, maybe an example problem, or some principles and formula. I've been a mechanical designer all of my career and haven't looked at much other than structural statics and dynamics - unfortunately no fluid dynamics since university days.

Might be a simple problem that i'm over complicating, but any advice would be greatly appreciated.

Cheers

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# Damping due to porous plate travelling through hydraulic oil

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