Research Papers

Mapping the Efficiency of a Double Acting, Single-Rod Hydraulic-Actuator Using a Critically Centered Four-Way Spool Valve and a Load-Sensing Pump

[+] Author and Article Information
Levi H. Manring

Mechanical Engineering and Material Science,
Pratt School of Engineering,
Duke University,
Durham, NC 27708
e-mail: levi.manring@duke.edu

Noah D. Manring

Mechanical and Aerospace Engineering,
College of Engineering,
University of Missouri,
Columbia, MO 65203
e-mail: ManringN@missouri.edu

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT,AND CONTROL. Manuscript received July 17, 2017; final manuscript received February 21, 2018; published online April 30, 2018. Assoc. Editor: Heikki Handroos.

J. Dyn. Sys., Meas., Control 140(9), 091017 (Apr 30, 2018) (10 pages) Paper No: DS-17-1367; doi: 10.1115/1.4039572 History: Received July 17, 2017; Revised February 21, 2018

In this paper, an efficiency map is created for a double-acting, single-rod hydraulic-actuator using a critically centered four-way spool valve and a load-sensing pump. The purpose of this research is to provide an understanding of the performance of a valve-controlled hydraulic actuator under all operating conditions. This paper considers a four-quadrant set of operating conditions, where each quadrant represents a different combination of actuator retraction or extension and overrunning or resistive loading. This four-quadrant efficiency map is the first presentation of its kind in the literature, and clearly demonstrates the performance characteristics and limitations for this hydraulic system. For its most common operation of an actuator extending under a resistive load, the map shows that this system can operate at over 82% efficiency and can move large loads. The map also shows physical limitations for the system, such as maximum pressure limits, maximum displacement limits, and valve limits. The efficiency map is plotted in nondimensional form, which presents the most general understanding of system performance and also allows dimensional values to be reconstructed for a similar system of any size.

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Grahic Jump Location
Fig. 1

Diagram of the hydraulic pump-valve-actuator system

Grahic Jump Location
Fig. 2

A four-quadrant representation of the pump-valve-actuator operating conditions

Grahic Jump Location
Fig. 3

A four-quadrant efficiency map as it varies with the nondimensional force, F̂, and the nondimensional velocity, v̂ (hatched areas denote the possibility of energy regeneration)



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