Article | 13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden | Investigation of a Digital Hydraulic Actuation System on an Excavator Arm
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Title:
Investigation of a Digital Hydraulic Actuation System on an Excavator Arm
Author:
Alessandro Dell’Amico: Division of Fluid and Mechatronic Systems, Department of Management and Engineering, Link√∂ping University, Link√∂ping, Sweden Marcus Carlsson: Division of Fluid and Mechatronic Systems, Department of Management and Engineering, Link√∂ping University, Link√∂ping, Sweden Erik Norlin: Division of Fluid and Mechatronic Systems, Department of Management and Engineering, Link√∂ping University, Link√∂ping, Sweden Magnus Sethson: Division of Fluid and Mechatronic Systems, Department of Management and Engineering, Link√∂ping University, Link√∂ping, Sweden
DOI:
10.3384/ecp1392a50
Download:
Full text (pdf)
Year:
2013
Conference:
13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden
Issue:
092
Article no.:
050
Pages:
505-511
No. of pages:
7
Publication type:
Abstract and Fulltext
Published:
2013-09-09
ISBN:
978-91-7519-572-8
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press; Linköpings universitet


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Digital hydraulics is an ongoing trend that offers many interesting advantages and possibilities. Digital refers to that the system output is discrete; e.g. using an on/off valve with only discrete values or a finite amount of flow steps available. The advantages mentioned when compared to analogue systems are better performance; robust and fault tolerant; and amplitude independent bandwidth. On the other side noise and pressure pulsations must be handled; the physical size can be a problem; and the system requires complicated control. When considering control of linear motion; there are mainly two branches; controlling the flow with several parallel connected on/off valves; which generates discrete output flow values; or switching valves; which in theory can generate any mean output flow. The latter only requires one valve for each flow path but the demand for fast valves is very high; while the former requires many valves but avoids high frequent switching. With the introduction of a multi-chamber cylinder; secondary control is now also possible for linear motion. This paper is a first step in the investigation of the system applied to an excavator arm. The cylinder has four chambers; each with different area. Three pressure lines are used and a valve-pack of 27 on/off valves. The valve-pack connects the three pressure lines with each chamber generating 81 available force steps. The scope has been to start out with relative simple control of the velocity of the cylinder. To handle unnecessary switching of valves; different penalty strategies were tested. The results are promising where relatively smooth control could be achieved at the same time challenges with the system were identified. Next step is to investigate the force transients due to different capacitance in all four chambers as well as mode control for better accuracy. Energy potential compared to original system remains to investigate as well.

Keywords: Digital hydraulics; secondary control; excavator; on/off-valves

13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden

Author:
Alessandro Dell’Amico, Marcus Carlsson, Erik Norlin, Magnus Sethson
Title:
Investigation of a Digital Hydraulic Actuation System on an Excavator Arm
DOI:
http://dx.doi.org/10.3384/ecp1392a50
References:

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13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden

Author:
Alessandro Dell’Amico, Marcus Carlsson, Erik Norlin, Magnus Sethson
Title:
Investigation of a Digital Hydraulic Actuation System on an Excavator Arm
DOI:
http://dx.doi.org/10.3384/ecp1392a50
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