liu.seSearch for publications in DiVA
Change search
Link to record
Permanent link

Direct link
BETA
Palmberg, Jan-Ove
Alternative names
Publications (10 of 61) Show all publications
Axin, M., Palmberg, J.-O. & Krus, P. (2012). Optimized Damping in Cylinder Drives Using the Meter-out Orifice: Design and Experimental Verification. In: 8th International Fluid Power Conference Dresden: "Fluid Power Drives!". Paper presented at 8th International Fluid Power Conference, March 26 - 28, 2012, Dresden (pp. 579-591). , 1
Open this publication in new window or tab >>Optimized Damping in Cylinder Drives Using the Meter-out Orifice: Design and Experimental Verification
2012 (English)In: 8th International Fluid Power Conference Dresden: "Fluid Power Drives!", 2012, Vol. 1, p. 579-591Conference paper, Oral presentation only (Other academic)
Abstract [en]

This paper analyses the damping of a flow controlled cylinder with a mass load and an outlet orifice. By using linear models, a mathematical expression for the damping is derived. It is shown that the volumes on each side of the piston have a high impact on the damping. In case of a small volume on the inlet side, the damping becomes low. However, the most important thing is to design the outlet orifice area properly. There exists an optimal orifice dimension; both smaller and larger orifice areas give low damping independently of the size of the volumes. In this paper a design is proposed of the outlet orifice area that optimizes the damping of the system. Experimental results which confirm the theoretical expectations are also presented. The conclusions are that without an outlet orifice, the hydraulic system will not contribute with any damping at all. Furthermore, large dead volumes in the cylinder will increase the damping, but at the expense of the system’s efficiency.

Keywords
Damping, compensator, outlet orifice, efficiency
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-76878 (URN)
Conference
8th International Fluid Power Conference, March 26 - 28, 2012, Dresden
Available from: 2012-04-23 Created: 2012-04-23 Last updated: 2015-09-07
Ericson, L. & Palmberg, J.-O. (2012). Unsteady Flow through a Valve Plate Restrictor in a HydraulicPump/Motor Unit. Paper presented at 8th International Fluid Power Conference.
Open this publication in new window or tab >>Unsteady Flow through a Valve Plate Restrictor in a HydraulicPump/Motor Unit
2012 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Noise is a well known challenge in hydraulic systems. Hydrostatic machines are amongthe largest noise contributors in a hydraulic system. The noise from the machine originatesfrom flow pulsations at the discharge and suction ports, as well as pulsations inpiston forces and bending moments. This article investigates the dynamic behaviour ofunsteady flow through a valve plate in an axial piston pump. The proposed extension ofthe steady state restrictor equation includes a dynamic internal mass term and a resistance.The results from 1D model are validated with a 3D CFD model. Different valveplates’ configurations and pump sizes are easily simulated with the two simulation models.The simulation results show very good comparison with experimental tests. Theproposed method is verified with a hydraulic pump application but it can probably alsoapply for original restrictors too.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-85659 (URN)
Conference
8th International Fluid Power Conference
Available from: 2012-11-28 Created: 2012-11-27 Last updated: 2017-12-20Bibliographically approved
Axin, M., Eriksson, B., Palmberg, J.-O. & Krus, P. (2011). Dynamic Analysis of Single Pump, Flow Controlled Mobile Systems. In: Harri Sairiala & Kari T. Koskinen (Ed.), The Twelfth Scandinavian International Conference on Fluid Power, SICFP'11: Volume 2. Paper presented at The Twelfth Scandinavian International Conference on Fluid Power, SICFP'11, May 18-20, 2011 Tampere, Finland (pp. 223-238).
Open this publication in new window or tab >>Dynamic Analysis of Single Pump, Flow Controlled Mobile Systems
2011 (English)In: The Twelfth Scandinavian International Conference on Fluid Power, SICFP'11: Volume 2 / [ed] Harri Sairiala & Kari T. Koskinen, 2011, p. 223-238Conference paper, Published paper (Refereed)
Abstract [en]

Interest has increased in flow controlled systems in the field of mobile fluid power. The capital distinction between traditional load-sensing (LS) systems and flow controlled systems is that the pump is controlled based on the operator’s total flow demand rather than maintaining a certain pressure margin over the maximum load pressure. One of the main advantages of flow controlled systems is the absence of the feedback of the highest load pressure to the pump controller. In this paper, a dynamic analysis is performed where flow controlled and LS systems are compared. It is shown how instability can occur in LS systems due to the pump controller and proven that no such instability properties are present in flow controlled systems. A drawback with one type of flow controlled system is that the highest load dynamically will disturb the lighter loads. This paper shows a novel way to optimize the damping in such systems by controlling the opening position of the directional valve independently of the flow. The mentioned disturbance between the highest load to the others can thereby be reduced.

Keywords
Flow control, load sensing, dynamic analysis, stability, damping
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-68636 (URN)978-952-15-2519-3 (ISBN)
Conference
The Twelfth Scandinavian International Conference on Fluid Power, SICFP'11, May 18-20, 2011 Tampere, Finland
Available from: 2011-05-25 Created: 2011-05-25 Last updated: 2015-09-07
Eriksson, B. & Palmberg, J.-O. (2011). Individual Metering Fluid Power Systems: Challenges and Opportunities. Paper presented at Proceedings of the Sixth International Fluid Power Conference, IFK’08, March 31 - April 2, Dresden, Gemany. Proceedings of the Institution of mechanical engineers. Part I, journal of systems and control engineering, 225(12), 196-211
Open this publication in new window or tab >>Individual Metering Fluid Power Systems: Challenges and Opportunities
2011 (English)In: Proceedings of the Institution of mechanical engineers. Part I, journal of systems and control engineering, ISSN 0959-6518, E-ISSN 2041-3041, Vol. 225, no 12, p. 196-211Article in journal (Refereed) Published
Abstract [en]

A review of recent and current research on individual metering fluid power systems is presented. An overview of different systems and their pros and cons is given. General challenges related to independent metering fluid power systems are discussed. The major choices in the design of these systems are the hardware layout and the control strategy. The evolution of existing independent metering fluid power systems from the 1970s until the present day is also presented.

Place, publisher, year, edition, pages
Professional Engineering Publishing, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-61360 (URN)000288805000002 ()
Conference
Proceedings of the Sixth International Fluid Power Conference, IFK’08, March 31 - April 2, Dresden, Gemany
Note

DOI does not work: 10.1243/09596518JSCE1111

Available from: 2010-11-16 Created: 2010-11-16 Last updated: 2018-03-12
Eriksson, B. & Palmberg, J.-O. (2010). How to handle auxiliary functions in energy efficient, single pump, flow sharing mobile systems. In: Hubertus Murrenhoff (Ed.), 7th International Fluid Power Conference Aachen: Efficiency Through Fluid Power, Workshop Proceedings, Vol. 1. Paper presented at The 7th International Fluid Power Conference, 22th- 24th March, Aachen, Germany (pp. 65-78). Aachen: Apprimus Wissenschafts Verlag, 1
Open this publication in new window or tab >>How to handle auxiliary functions in energy efficient, single pump, flow sharing mobile systems
2010 (English)In: 7th International Fluid Power Conference Aachen: Efficiency Through Fluid Power, Workshop Proceedings, Vol. 1 / [ed] Hubertus Murrenhoff, Aachen: Apprimus Wissenschafts Verlag , 2010, Vol. 1, p. 65-78Conference paper, Published paper (Refereed)
Abstract [en]

Interest has increasingly shifted from load-sensing (pressure controlled) systems to flow controlled systems. In this paper an interesting configuration that uses pre-compensated valves with flow sharing properties is studied. The fundamental difference between a traditional load sensing (LS) system and a flow controlled system is that the pump is controlled based on the operator’s total flow demand rather than maintaining a certain margin pressure over the maximum load pressure. One of the main advantages with flow controlled systems is the absence of the feedback of the highest load pressure to the pump. Flow controlled systems also present some challenges, one being how to handle auxiliary functions with unknown flow demands. Auxiliary functions are typically support legs, external power takeouts etc. This paper analyses one kind of flow controlled system and shows one way of dealing with auxiliary functions.

Place, publisher, year, edition, pages
Aachen: Apprimus Wissenschafts Verlag, 2010
Keywords
fluid power, load sensing, flow control, energy efficiency
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-58146 (URN)978-39-4056-590-7 (ISBN)
Conference
The 7th International Fluid Power Conference, 22th- 24th March, Aachen, Germany
Available from: 2010-08-04 Created: 2010-08-04 Last updated: 2015-08-31Bibliographically approved
Ericson, L., Johansson, A. & Palmberg, J.-O. (2010). Noise reduction by means of non-uniform placement of pistons in a fluid power machine. Paper presented at 2nd Annual Dynamic Systems and Control Conference October 12-14, Hollywood, CA, USA.
Open this publication in new window or tab >>Noise reduction by means of non-uniform placement of pistons in a fluid power machine
2010 (English)Manuscript (preprint) (Other academic)
Abstract [en]

In conventional machines, the pulsations are periodic and originate from the uniform placement of a given number of pistons. This paper discusses the possibilities to introduce non-uniform placement of the pistons. The pulsations periodicity is thus changed, which can have a major impact on the noise level and how the noise is experienced. A number of approaches are presented, evaluated and ranked and the usefulness of the modifications is assessed. This study employs a transfer function methodology to map simulated internal pump dynamics, such as piston forces and bending moments, to audible noise. Using these transfer functions, it is possible for instance to predict how changed valve plate timing affects simulated piston forces and bending moments and in turn how this will affect audible noise. Copyright © 2009 by ASME.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-73978 (URN)
Conference
2nd Annual Dynamic Systems and Control Conference October 12-14, Hollywood, CA, USA
Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2017-12-20Bibliographically approved
Ericson, L., Johansson, A. & Palmberg, J.-O. (2010). Noise reduction by means of non-uniform placement of pistons in a fluid power machine. In: Proceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009: . Paper presented at 2nd Annual Dynamic Systems and Control Conference October 12-14, Hollywood, CA, USA (pp. 1293-1300). (PART B)
Open this publication in new window or tab >>Noise reduction by means of non-uniform placement of pistons in a fluid power machine
2010 (English)In: Proceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009, 2010, no PART B, p. 1293-1300Conference paper, Published paper (Refereed)
Abstract [en]

In conventional machines, the pulsations are periodic and originate from the uniform placement of a given number of pistons. This paper discusses the possibilities to introduce non-uniform placement of the pistons. The pulsations periodicity is thus changed, which can have a major impact on the noise level and how the noise is experienced. A number of approaches are presented, evaluated and ranked and the usefulness of the modifications is assessed. This study employs a transfer function methodology to map simulated internal pump dynamics, such as piston forces and bending moments, to audible noise. Using these transfer functions, it is possible for instance to predict how changed valve plate timing affects simulated piston forces and bending moments and in turn how this will affect audible noise. Copyright © 2009 by ASME.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-59095 (URN)978-0-7918-3860-0 (ISBN)
Conference
2nd Annual Dynamic Systems and Control Conference October 12-14, Hollywood, CA, USA
Available from: 2010-09-21 Created: 2010-09-09 Last updated: 2017-12-20
Ericson, L. & Palmberg, J.-O. (2010). Unsteady Flow through Valve Plate Restrictor in a Hydraulic Pump/Motor Unit. Paper presented at 2nd Annual Dynamic Systems and Control Conference October 12-14, Hollywood, CA, USA.
Open this publication in new window or tab >>Unsteady Flow through Valve Plate Restrictor in a Hydraulic Pump/Motor Unit
2010 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Noise is a well known challenge in hydraulic systems. Hydrostatic machines are among the largest noise contributors in a hydraulic system.The noise from the machine originates from flow pulsations at the discharge and suction ports, as well as pulsations in piston forces and bending moments.

This article investigates the dynamic behaviour of unsteady flow through a valve plate in an axial piston pump. The proposed extension of the steady state restrictor equation includes a dynamic internal mass term and a resistance. The results from 1D model are validated with a 3D CFD model. Different valve plates’ configurations and pump sizes are easily simulated with the two simulation models. The simulation results show very good comparison with experimental tests. The proposed method is verified with a hydraulic pump application but it can probably also apply for original restrictors too.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-73980 (URN)
Conference
2nd Annual Dynamic Systems and Control Conference October 12-14, Hollywood, CA, USA
Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2017-12-20Bibliographically approved
Eriksson, B., Rösth, M. & Palmberg, J.-O. (2009). An LQ-Control Approach for Independent Metering Systems. In: 11th Scandinavian International Conference on Fluid Power, SICFP'09, Linköping, Sweden, 2nd-4th June. Linköping
Open this publication in new window or tab >>An LQ-Control Approach for Independent Metering Systems
2009 (English)In: 11th Scandinavian International Conference on Fluid Power, SICFP'09, Linköping, Sweden, 2nd-4th June, Linköping, 2009Conference paper, Published paper (Refereed)
Abstract [en]

This paper deals with the control of an individual metering fluid power system. There are a number of reasons to use individual metering technology, one is flexibility. In traditional valves there is a mechanical connection between the meter-in orifice and the meter-out orifice. By control this orifices individually one valve can be used in different applications without hard- ware modifications. Instead of change spool the software is changed. Since there are more control signals and thereby more outputs to control there is also an opportunity of improve- ments of the dynamics compared to a conventional system. In this paper an approach with LQ-technique is presented for improvements of system dynamics. Since all states in the sys- tem can not be measured a state observer is also considered in the control design. These work present simulations, implementations in a real world forwarder application and results from ve- rifying experiments.

Place, publisher, year, edition, pages
Linköping: , 2009
Keywords
fluid power, independent metering, LQ, flow amplifying poppet (FAP), Valvistor, poppet valve, energy savings
Identifiers
urn:nbn:se:liu:diva-52687 (URN)
Available from: 2010-01-08 Created: 2010-01-08 Last updated: 2015-08-31
Axin, M., Eriksson, B. & Palmberg, J.-O. (2009). Energy Efficient Load Adapting System Without Load Sensing: Design and Evaluation. In: : . Paper presented at 11th Scandinavian International Conference on Fluid Power, SICFP'09, June 2-4, Linköping, Sweden. Linköping
Open this publication in new window or tab >>Energy Efficient Load Adapting System Without Load Sensing: Design and Evaluation
2009 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In load sensing systems, the pump pressure is controlled in a closed loop control mode. In this paper, a system solution where the displacement of the pump is controlled directly from the operator's demand is studied. Both the stability and the response is thereby improved. It also implies a better energy efficiency since the pump pressure will be adapted according to the point of operation with no additional pressure margin needed. In some mobile applications, pressure compensation is required to avoid load interference. When using common pre compensators in a displacement controlled system, the pump and the valve will both control the flow. A better solution would be to control the flow by the pump and utilize the valve as a flow divider. This can be achieved by using flow sharing compensators. It also allows further energy savings since the maximum restriction area of the main spool at one of the loads can be utilized independent of the flow delivered by the pump. This paper addresses the problem with using common pre compensators in displacement controlled systems and analyses and compares both a traditional load sensing system and an open controlled pump solution with flow sharing compensators. Measurements on a wheel loader application equipped with the system presented in this paper shows a decreased energy consumption of 14 % for the working hydraulics compared to a load sensing system during a short loading cycle, provided that the pump is not saturated.

Place, publisher, year, edition, pages
Linköping: , 2009
Keywords
fluid power, mobile systems, LS systems, pre compensation, energy efficiency, flow sharing
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-52691 (URN)
Conference
11th Scandinavian International Conference on Fluid Power, SICFP'09, June 2-4, Linköping, Sweden
Available from: 2010-01-08 Created: 2010-01-08 Last updated: 2015-08-31Bibliographically approved
Organisations

Search in DiVA

Show all publications