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### Author Topic: Outlining system for regulating hydraulic valves  (Read 1096 times)

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#### Ihshan1981

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• Posts: 3
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##### Outlining system for regulating hydraulic valves
« on: May 15, 2009, 04:46:02 AM »
Hi guys.

Dont know how to explain this properly but I'll give it a shot.

I need to outline a system for controlling hydraulic valves and pumps that direct
hydraulic pressure to cylinders which in turn operates the robotic arm.
The robot has three arms, two of which are moved with cylinders
and the whole thing can rotate using a hydraulic motor.

My input would be:
Oil flow (m^3/min)
Open/close valve duration (how long the valve stays open and oil flow is maintained)

I just need a superficial explaination on how something like this can be achived.
Any links to helpful websites is also very much appreciated.

This is for a school assignment and Im completely stuck

Thanks for any help!

#### Admin

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##### Re: Outlining system for regulating hydraulic valves
« Reply #1 on: May 30, 2009, 07:44:48 AM »
What is your background? Are you a mechanical engineer?

So given an oil flow rate, you must then select a cylinder diameter to generate the force required. This is because flow rate, diameter, and pressure determine force.

D = sqrt(4*Q/(pi*V))

where
# D - pipe diameter
# Q - volumetric flow rate (m^3/min)
# V - velocity (the speed that you want the piston to move)

assumptions:
oil is incompressible
room temperature
laminar flow

Now, using static force analysis, position the piston so that it applies force just where you want it.

(hoping that made sense, I simplified it as much as I could)

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