Oleo Operation and Calculations

[gutboy17]

I'm trying to estimate the force and dampening effect of an oleo strut on a piece of equipment. I need some guidance on what parameters I need to gather off the strut and then how to calculate the resistant force over the travel of the strut and the dampening the strut provides. I currently have all the geometery of the strut, type of dampening oil and the operational gas charge pressure. Do I need more data? Is the resistance force as easy as the gas pressure times the strut tube inner diameter?

 

[GregLocock]

you'll need the piston diameter, and the orifice diameter and length. I doubt you'll get an accurate answer working from first principles.



Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[gutboy17]

I have all that data. I just need to understand how to apply it to get a force dampening effect.

 

[gwolf]

You will have to include friction on any moving components and the flow of fluid through the strut internal orifices. It is this flow which provides the damping and the level of damping varies with speed.

I hope you have a simulation package because this could start to get very complicated. You will need to consider orifice discharge coefficients, all sorts of stuff.

Good luck.

 

[GregLocock]

OK, use ADAMS/Hydraulics from

http://www.msc.com

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.