A Self-Contained Electro-Hydraulic Cylinder with Passive Load-Holding Capability
AbstractSelf-contained electro-hydraulic cylinders have the potential to replace both conventional hydraulic systems and the electro-mechanical counterparts enhancing energy efficiency, plug-and-play installation, and reduced maintenance. Current commercial solutions of this technology are limited and typically tailor-made, whereas the research emphasis is primarily on cost efficiency and power applications below five [kW]. Therefore, there is the need of developing more flexible systems adaptable to multiple applications. This research paper offers a contribution in this regard. It presents an electro-hydraulic self-contained single-rod cylinder with passive load-holding capability, sealed tank, capable of recovering energy, and scalable up to about eighty [kW]. The system implementation on a single-boom crane confirms its feasibility: The position tracking error remains well within ±2 [mm], oscillations are limited, and the overall energy efficiency is about 60 [%] during actuation. Concerning the passive load-holding devices, it is shown that both vented and non-vented pilot-operated check valves achieve the desired functioning and can hold the actuator position without consuming energy. Additional observations about the size and the arrangement of the load-holding valves are also provided. In conclusion, this paper demonstrates that the proposed self-contained cylinder can be successfully extended to several practical applications, especially to those characterized by overrunning external loads and the need of securing the actuator position. View Full-Text
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Padovani, D.; Ketelsen, S.; Hagen, D.; Schmidt, L. A Self-Contained Electro-Hydraulic Cylinder with Passive Load-Holding Capability. Energies 2019, 12, 292.
Padovani D, Ketelsen S, Hagen D, Schmidt L. A Self-Contained Electro-Hydraulic Cylinder with Passive Load-Holding Capability. Energies. 2019; 12(2):292.Chicago/Turabian Style
Padovani, Damiano; Ketelsen, Søren; Hagen, Daniel; Schmidt, Lasse. 2019. "A Self-Contained Electro-Hydraulic Cylinder with Passive Load-Holding Capability." Energies 12, no. 2: 292.
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