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.
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July 2016
Technical Briefs
A Combined Variable Displacement–Digital Cylinder Hydraulic Drive for Large Presses With High Operating Frequencies
Florian Messner,
Florian Messner
Institute of Machine Design and Hydraulic Drives,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: florian.messner@jku.at
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: florian.messner@jku.at
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Rudolf Scheidl,
Rudolf Scheidl
Institute of Machine Design and Hydraulic Drives,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: rudolf.scheidl@jku.at
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: rudolf.scheidl@jku.at
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Hubert Gattringer,
Hubert Gattringer
Institute of Robotics,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: hubert.gattringer@jku.at
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: hubert.gattringer@jku.at
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Klemens Springer
Klemens Springer
Institute of Robotics,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: klemens.springer@jku.at
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: klemens.springer@jku.at
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Florian Messner
Institute of Machine Design and Hydraulic Drives,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: florian.messner@jku.at
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
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: rudolf.scheidl@jku.at
Rainer Haas
Hubert Gattringer
Institute of Robotics,
Johannes Kepler University Linz,
Linz 4040, Austria
e-mail: hubert.gattringer@jku.at
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
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. Jul 2016, 138(7): 074502 (5 pages)
Published Online: May 4, 2016
Article history
Received:
December 23, 2014
Revised:
March 16, 2016
Citation
Messner, F., Scheidl, R., Haas, R., Gattringer, H., and Springer, K. (May 4, 2016). "A Combined Variable Displacement–Digital Cylinder Hydraulic Drive for Large Presses With High Operating Frequencies." ASME. J. Dyn. Sys., Meas., Control. July 2016; 138(7): 074502. https://doi.org/10.1115/1.4033105
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