Abstract
So far not very much research has been done and not many experimental results are available on water hydraulic position servos. In this paper the feasibility of a design method similar to that used in oil hydraulic position servos is studied in water hydraulics. The P-controller water hydraulic position servo cylinder is designed in the way well known from oil hydraulics. The P-controller is used because it is simple, widely in use and good for comparison.
The design process, theoretical equations and experimental results are presented. The variation rate in the position accuracy, settling time and dynamic behavior with different steps is shown. The specifications arrived at position accuracy, settling time and dynamics for the water hydraulic position servo system are compared with the oil hydraulic specifications. The applicability of the design method and the parameter approximations used in the P-controlled water hydraulic position servos is discussed.
