Hydraulic actuators play an important role in various industries. In the last decades, to improve system performance, some advanced control methods have been developed. Backstepping control, which can deal with nonlinearities, is widely used hydraulic motion control. This paper focuses on high-frequency position servo of systems proportional valves. backstepping controllers, valve dynamics are ...

The clearance flow around the pump-turbine runner has significant influences on unit vibrations, which may cause accidents in transient processes. dynamic hydraulic forces and patterns channel (CFC) of a low specific-speed were analyzed based 3D CFD simulations during runaway oscillating process. It is shown that axial force periodically fluctuates with large amplitudes, its components CFC main...