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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Teemu Koitto & Heikki Kauranne & Olof Calonius & Tatiana Minav & Matti Pietola, 2019. "Experimental Study on Fast and Energy-Efficient Direct Driven Hydraulic Actuator Unit," Energies, MDPI, vol. 12(8), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:8:p:1538-:d:225341
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    References listed on IDEAS

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    1. Damiano Padovani & Søren Ketelsen & Daniel Hagen & Lasse Schmidt, 2019. "A Self-Contained Electro-Hydraulic Cylinder with Passive Load-Holding Capability," Energies, MDPI, vol. 12(2), pages 1-21, January.
    2. Quan, Zhongyi & Quan, Long & Zhang, Jinman, 2014. "Review of energy efficient direct pump controlled cylinder electro-hydraulic technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 35(C), pages 336-346.
    3. Abinab Niraula & Shuzhong Zhang & Tatiana Minav & Matti Pietola, 2018. "Effect of Zonal Hydraulics on Energy Consumption and Boom Structure of a Micro-Excavator," Energies, MDPI, vol. 11(8), pages 1-22, August.
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    2. Mustafa Karamuk & Orhan Behic Alankus, 2023. "Direct Tilt Controller Design with Disturbance Compensation and Implementation for a Narrow Tilting Electric Vehicle," Energies, MDPI, vol. 16(15), pages 1-28, July.

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