Technical Brief

A Combined Variable Displacement–Digital Cylinder Hydraulic Drive for Large Presses With High Operating Frequencies

[+] Author and Article Information
Florian Messner

Institute of Machine Design and Hydraulic Drives,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: florian.messner@jku.at

Rudolf Scheidl

Institute of Machine Design and Hydraulic Drives,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: rudolf.scheidl@jku.at

Rainer Haas

Linz Center of Mechatronics,
Linz 4040, Austria
e-mail: rainer.haas@lcm.at

Hubert Gattringer

Institute of Robotics,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: hubert.gattringer@jku.at

Klemens Springer

Institute of Robotics,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: klemens.springer@jku.at

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received December 23, 2014; final manuscript received March 16, 2016; published online May 4, 2016. Assoc. Editor: Jingang Yi.

J. Dyn. Sys., Meas., Control 138(7), 074502 (May 04, 2016) (5 pages) Paper No: DS-14-1546; doi: 10.1115/1.4033105 History: Received December 23, 2014; Revised March 16, 2016

In this technical brief, a novel hydraulic drive for large forces and power ratings at relatively high operating frequencies combining variable displacement control and hydraulic digital control is introduced. Basic analog motion control is achieved via variable displacement pumps driving a first cylinder stage. Digital control is realized by switching additional hydraulic cylinder stages on and off to support the analog stage if high forces are needed. The control strategy corresponds to this hydraulic concept. It consists of a feed forward control, a switching logic for the digital booster stages and a feed back proportional-integral (PI) control for stabilization. The validity of this concept and of the control strategy are shown by experiments on a highly downscaled test rig.

Copyright © 2016 by ASME
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Grahic Jump Location
Fig. 2

Building low and high pressure level: (a) as well as the load force, (b) at the test rig, results for a first (c), and second (d) series of measurements

Grahic Jump Location
Fig. 1

Conceptual setup (a) and corresponding force distribution (b); model setup (c) and derived control strategy (d)



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