Experimental Study on Fast and Energy-Efficient Direct Driven Hydraulic Actuator Unit

Teemu Koitto, Heikki Kauranne, Olof Calonius, Tatiana Minav and Matti Pietola
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Teemu Koitto: Department of Mechanical Engineering, Aalto University, 02150 Espoo, Finland
Heikki Kauranne: Fiellberg Oy, FI-01720 Vantaa, Finland
Olof Calonius: Department of Mechanical Engineering, Aalto University, 02150 Espoo, Finland
Tatiana Minav: Department of Mechanical Engineering, Aalto University, 02150 Espoo, Finland
Matti Pietola: Department of Mechanical Engineering, Aalto University, 02150 Espoo, Finland

Energies, 2019, vol. 12, issue 8, 1-17

Abstract: In this experimental study, a Direct Driven Hydraulics (DDH) system of the closed circuit type was utilized for cyclic vertical actuation in heavy load material handling. The actuator was controlled by a speed-controlled fixed displacement pump. The high energy saving potential of this system has been demonstrated in previous studies by the authors, but the dynamic characteristics of the ramped and P-controlled base system were considered unsatisfactory. Therefore, the system was implemented with an open-loop S-curve control that utilized a pre-calculated RPM (revolutions per minute) profile for the electric motor in order to realize a smooth actuator and load transition as a function of time. The results indicate that S-curve control is exceptionally well suited for producing a controlled lifting–lowering rapid motion with a heavy load, while still keeping the actuator chamber pressures within acceptable limits. In comparison, the motion produced by P-control was characterized by large unwanted pressure peaks together with velocity fluctuations and vibrations at the end of the stroke. Using a combination of S-curve control and hydraulic load compensation, a mass of 1325 kg could be moved 0.26 m in less than 0.5 s. The load compensation reduced the energy consumption by 64%, which would allow downsizing the electric motor and enable cost-efficient DDH implementation.

Keywords: electro-hydraulic actuator; direct driven hydraulics; displacement-controlled hydraulics; energy efficiency; controller; S-curve; industrial applications (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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