Hydraulic Actuators

A special issue of Actuators (ISSN 2076-0825).

Deadline for manuscript submissions: closed (31 August 2016) | Viewed by 10826

Special Issue Editor


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Guest Editor
Maha Professor Fluid Power Systems, Director Maha Fluid Power Reseaech Center, School of Mechanical Engineering, Purdue University, West Lafayette, IN, USA
Interests: displacement controlled actuation; hydraulic hybrid systems; energy efficient throttles actuation; modeling of pumps and motors; fluid structure interaction; secondary control; active vibration damping utilizing pump control; powertrain control; noise reduction and active noise control

Special Issue Information

Dear Colleagues,

Hydraulic actuators have been used for primary and secondary flight controls of large commercial and military aircrafts since the late 1950s. Excellent precision control, high bandwidth, together with extreme high power density of those valve controlled hydraulic actuators, have made them the technology of choice for many other industrial applications, and automotive and large vehicle systems. They have also been used to create the first large and powerful robots. However the traditional use of servo- or proportional valves makes the technology inefficient. Since late 1990s, many researchers worldwide work on alternative throttles hydraulic actuation technologies. These new hydraulic actuators can be grouped in the following principles: electro-hydrostatic actuators (EHA), pump controlled actuation, secondary controlled actuators, hydraulic hybrid actuation systems, hydraulic transformers, and hydraulic actuators based digital hydraulics.

This Special Issue will collect review and/or special topic papers on throttles hydraulic actuation.

Prof. Dr. Monika Ivantysynova
Guest Editor

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Keywords

  • Throttles actuation
  • Electro-hydrostatic actuation
  • Pump controlled actuation
  • Secondary controlled actuation
  • Hydraulic hybrid actuators
  • Hydraulic transformers
  • Hydraulic actuators based on digital hydraulics

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Published Papers (1 paper)

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Research

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Article
Design, Implementation and Evaluation of a Pump-Controlled Circuit for Single Rod Actuators
by Ahmed Imam, Moosa Rafiq, Ehsan Jalayeri and Nariman Sepehri
Actuators 2017, 6(1), 10; https://doi.org/10.3390/act6010010 - 20 Feb 2017
Cited by 30 | Viewed by 9919
Abstract
Pump-controlled hydraulic circuits are more efficient than valve-controlled circuits, as they eliminate the energy losses due to flow throttling in valves and require less cooling effort. Presently existing pump-controlled solutions for single rod cylinders encounter an undesirable performance during certain operating conditions. This [...] Read more.
Pump-controlled hydraulic circuits are more efficient than valve-controlled circuits, as they eliminate the energy losses due to flow throttling in valves and require less cooling effort. Presently existing pump-controlled solutions for single rod cylinders encounter an undesirable performance during certain operating conditions. This paper investigates the performance issues in common pump-controlled circuits for the single rod actuators. Detailed analysis is conducted that identifies these regions in a load-velocity plane and the factors affecting them. The findings are validated by experimental results. A new design is then proposed that employs a limited throttling valve alongside two pilot operated check valves for differential flow compensation to improve the performance. The valve is of the flow control type and is chosen to have a throttling effect over critical regions; it has the least throttling over other operating regions, thus maintaining efficiency. Experimental work demonstrates improved performance in a full operating range of the actuator as compared to a circuit that uses only the pilot-operated check valves. This circuit is energy efficient and capable of recuperating energy. Full article
(This article belongs to the Special Issue Hydraulic Actuators)
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