This research is aimed at generating an efficiency map for a linear hydraulic-actuator that is controlled using an open-centered 4-way valve. Using the basic configuration of a double rod, double-acting 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 actuator-force that may be achieved at a given actuator-velocity. While the actuator chosen for this paper is common, extensions of the methods used in this study may be applied to double-acting, single-rod designs or single-acting, single-rod 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 hydraulic-actuators that use this type of valve design.
[1]
H. E. Merritt,et al.
Hydraulic Control Systems
,
1991
.
[2]
Huei Peng,et al.
ANALYSIS OF ACTIVE SUSPENSION SYSTEMS WITH HYDRAULIC ACTUATORS
,
2004
.
[3]
J. Lowen Shearer,et al.
Fluid power control
,
1960
.
[4]
John Watton,et al.
Fundamentals of Fluid Power Control: Contents
,
2009
.
[5]
Michael F. Ashby,et al.
Actuator Classification and Selection—The Development of a Database
,
2002
.
[6]
Norman M. Wereley,et al.
Design of a High-Efficiency Magnetorheological Valve
,
2002
.
[7]
Andrew G. Alleyne.
A systematic approach to the control of electrohydraulic servosystems
,
1998,
Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207).