Efficiency Mapping for a Linear Hydraulic Actuator

Abstract

This research is aimed at generating an efficiency map for a linear hydraulicactuator that is controlled using an opencentered 4way valve. Using the basic configuration of a double rod, doubleacting linear actuator, equations for describing the input and output power of the actuator are written and nondimensionalized to produce a nondimensional map for the efficiency of the actuator itself. In conclusion, the actuator is shown to operate below a wide open valve (WOV) line with efficiencies that are typically less than 50%. Note that the WOV line describes the maximum actuatorforce that may be achieved at a given actuatorvelocity. While the actuator chosen for this paper is common, extensions of the methods used in this study may be applied to doubleacting, singlerod designs or singleacting, singlerod designs. Furthermore, it is anticipated that this type of analysis may also be used to study the effects of power regenerating valves and for predicting the efficiency improvements that may be gained for linear hydraulicactuators that use this type of valve design.