Hi,
I'm trying to make a closed loop hydraulic actuator but i cannot manage to make it work.
I'm using a bidirectionnal pump, the input signal has this shape:
If i plot the flow rate on the line B of the cylinder i have,almost as excpected, something like that:
So if there is a flow rate, the cylinder should move back and forth right? But if i plot the displacement of the cylinder i get this figure: The cylinder move to the end of its stroke and stay stuck there. I really don't get why this is happening.
I'm conscious that there should be some kind of tank on the hydraulic line, this being a closed loop system i was planning to use accumulators, but when adding them, the initial conditions fails to converge.
I have used variable step ode 23 solver and fixed step solver, and played with the step size to avoid the error " pressure drop below absolute zero".
Does anyone have an idea on how to make it work?
Thank you for your help.
Best Answer