Hi,
I found that most documents describe the open-loop transfer function of servo hydraulic system as the relationship between the size of the servo valve opening (X) and the piston displacement of the hydraulic cylinder (Y), whcih is Y/X. After adding a closed-loop, the target position can be controlled.
My understanding of this system is that in the case of open-loop, if we give the servo valve a constant drive current, servo valve opening size is fixed, and then the hydraulic cylinder piston will eventually stop at a specific position. But in actual use, it is found that the piston will continue to move until the end of the stroke. Why is this?
Thanks!
I found that most documents describe the open-loop transfer function of servo hydraulic system as the relationship between the size of the servo valve opening (X) and the piston displacement of the hydraulic cylinder (Y), whcih is Y/X. After adding a closed-loop, the target position can be controlled.
My understanding of this system is that in the case of open-loop, if we give the servo valve a constant drive current, servo valve opening size is fixed, and then the hydraulic cylinder piston will eventually stop at a specific position. But in actual use, it is found that the piston will continue to move until the end of the stroke. Why is this?
Thanks!