J. C. Renn
Department of Mechanical Engineering, National Yunlin University of Science and Technology, Douliou, Yunlin, Taiwan
C. Y. Cheng
Department of Mechanical Engineering, National Yunlin University of Science and Technology, Douliou, Yunlin, Taiwan
M. H. Lin
Department of Mechanical Engineering, National Yunlin University of Science and Technology, Douliou, Yunlin, Taiwan
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http://dx.doi.org/10.3384/ecp1392a13Published in: 13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden
Linköping Electronic Conference Proceedings 92:13, p. 123-130
Published: 2013-09-09
ISBN: 978-91-7519-572-8
ISSN: 1650-3686 (print), 1650-3740 (online)
Generally speaking; hydraulic control systems can be divided into two different driving concepts. The first one is the well-known valve-controlled system and the second one is the pump-controlled system. The former possesses the feature of fast dynamic response. However; the poor energy-saving performance is its major fault. On the contrary; the pump-controlled hydraulic system has the significant advantage of energy-saving which meets the current demand in modern machine design. In this paper; the simulation analysis using MatLab/SimuLink and DSHplus for a newly developed energy-saving hydraulic tube bender is conducted. Instead of the conventional fixed displacement hydraulic pump; the new hydraulic tube bender utilizes an internal gear pump with AC servomotor as its driving power source. In the new energy-saving hydraulic circuit; the use of conventional pressure relief valve and unloading valve are no longer necessary since the demanded flow-rate and pressure output can be precisely obtained by continuously changing the speed of the AC servomotor. In addition; two closed-loop control schemes using fuzzy sliding-mode controller are adopted and compared. From the simulation results; it is shown that the energy-saving performance of constant pressure control scheme is somewhat better than that of load-sensing control scheme. Furthermore; the simulation results also show that the newly developed hydraulic tube bender can save up to 42 % of energy consumption in a working cycle as compared to the conventional hydraulic tube bender
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