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research-article

FOUR-QUADRANT ANALYSIS AND SYSTEM DESIGN FOR SINGLE-ROD Hydrostatic Actuators

[+] Author and Article Information
Gustavo Koury Costa

Department of Mechanical Engineering, Federal Institute of Pernambuco, Brazil, Av. Prof. Luís Freire, 500 - Cidade Universitaria, Recife - PE, 50740-540, Brazil
gustavokoury@recife.ifpe.edu.br

Nariman Sepehri

ASME Fellow, Department of Mechanical Engineering, University of Manitoba, Canada, 75A Chancellors Circle, University of Manitoba, Winnipeg, MB, Canada, R3T 5V6
Nariman.Sepehri@umanitoba.ca

1Corresponding author.

ASME doi:10.1115/1.4041382 History: Received February 21, 2018; Revised August 29, 2018

Abstract

In this paper, we present a novel design for single-rod hydrostatic actuators that produces a stable response in all operation quadrants. The new design, which can have different embodiments, is built upon compensating for the differential flows coming in and out of single-rod actuators, by alternately connecting cap and rod sides of the cylinder to a flow source in accordance with the energy flow direction between the circuit and the load. We show that previous quadrant division definitions result in either geometric quadrants that do not coincide with motoring and pumping operation, or misrepresentations of the actual energy exchange between the load and the cylinder. The proposed quadrant representation gives the exact information about the right operation of compensating flow valves. The efficacy of the new design has been tested on an instrumented John Deere JD-48 backhoe. Precise redirection of the compensation flow allowed for non-oscillatory motions in all quadrants of operation and various loading conditions.

Copyright (c) 2018 by ASME
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