Dynamic Properties of Pressure Compensated Pump

Abstract

The aim of the study is to evaluate the dynamic properties of a variable displacement pump. It is a pressure compensated axial piston pump with swash plate. The dynamic properties will be evaluated for transient response. The transient response will be induced by the rapid closure of the directional valve located at the pump outlet. The consequence of the directional valve rapid closure is the regulation of the displacement. The main motivation of this paper is to determine, if the pump speed and the set pump displacement affect the control time in and the overshoot. A methodology for measuring the dynamic properties during the transient response is presented in this paper. The experimental circuit used to measure the dynamic properties is described. Subsequently, the time dependence of the pressure at the pump outlet is evaluated when the directional valve at the pump outlet is rapidly closed. The measurements are then used to evaluate the overshoot and the control time in as a function of the pump speed and the pump relative displacement. The results will be further used to create a mathematical model of a pressure compensated pump.