When a hydraulic cylinder has a small diameter and/or is located a long distance from its directional control valve, it's possible for the connecting pipelines between the cylinder and directional valve to hold more oil than the cylinder does. In this situation, cool, filtered oil from the re...
In this research, the most important role of the ESO is to estimate the internal leakage flow (𝑄̂𝐿𝑖) inside the hydraulic cylinder as 𝑄̂𝐿𝑖=−𝑥̂4𝑉1𝑡𝑉2𝑡𝛽𝑒(𝐴1𝑉2𝑡+𝐴2𝑉1𝑡) (24) Let 𝑥̃3,𝑥̃4 denote the estimation err...
For energy saving reasons, the pressure of the cylinder metering-out chamber was often designed at a lower level in the SMEHS. The system is easy to overshoot and oscillation when the load force drastically changes. The active damping strategy (ADS) is proposed in order to improve the system...