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Influence from the cross-angle on piston forces and bending moments in variable hydraulic piston pumps
Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
2003 (English)Report (Other academic)
Abstract [en]

By implementing an additional incline (cross-angle) of the swash plate of an axial piston pump, in the direction perpendicular to the traditional displacement direction, the piston dead-centre points will move as the displacement angle varies. The cross-angle is fixed and normally very small (1-4°). If designed correctly, the movement of the dead-centre points achieved by using a cross-angle coincides with the dead centres desired for optimal cylinder pre-compression and decompression for all displacement angles. It has in earlier works been described how the cross-angle enables minimisation of discharge and inlet peak-to-peak flow ripple for all displacement angles simultaneously. In this paper, it is also investigated how the piston forces and the bending moments are influenced.

The cross-angle is designed using simulation-based multi-objective optimisation. It is investigated how objective functions can be made up from peak-to-peak values as well as from frequency spectrum of signals. The trade-offs between the conflicting objectives considered are elucidated by using the concept of Pareto optimality. The result from such a Pareto optimisation is not one optimal solution, but a set of optimal solutions. With the technique presented, it is thus possible to investigate an optimal value for the cross-angle that the most beneficial impact on all factors that influence the noise level of the pump.

Place, publisher, year, edition, pages
2003.
Series
LITH-IKP-R, ISSN 0281-5001 ; 1391
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-85981OAI: oai:DiVA.org:liu-85981DiVA: diva2:574442
Available from: 2012-12-05 Created: 2012-12-05 Last updated: 2012-12-05
In thesis
1. Design principles for noise reduction in hydraulic piston pumps: simulation, optimisation and experimental verification
Open this publication in new window or tab >>Design principles for noise reduction in hydraulic piston pumps: simulation, optimisation and experimental verification
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Noise reduction in hydmulic systems has been an important research topic for several decades. In recent years, industry's interest in the area has grown dramatically. The reason is new national and international requirements and legislation governing working conditions. As a consequence of this, considerable reduction of noise from machinery in general has been achieved. The reduction of noise in hydraulic systems, however, has not gained from the same considerable progress, which implies that hydraulic noise has become perceptible through the surrounding machinery noise. Not only has noise reduction of hydraulic systems become increasingly important, it has also become more difficult because of the ever-increasing working pressure level, which is highly correlated to noise and vibration.

Noise in hydraulic systems is created mainly by the hydrostatic pump and motor, working with large pressure differences in the suction and delivery ports. Being exclusively of displacement type, the hydrostatic machine creates substantial flow pulsations in both the discharge and suction ports. The flow pulsations give rise to system pressure pulsations, which in turn transform into vibration and audible noise. Excessive pulsating piston forces and bending moments due to the large pressure difference between the machine's discharge and suction ports also contribute to noise and vibration.

To obtain satisfactory noise reduction, there is a need for effective and reliable design tools and design methods. This thesis concerns simulation, optimisation and experimental verification of axial piston pump design for noise reduction. Much of the work relates to the different origins of noise and how to formulate objective functions that simultaneously reflects different aspects of noise reduction. New and conventional design features are examined both theoretically and experimentally. One novel and promising design feature thoroughly investigated in this thesis is the so-called crossangle that aims to provide low noise in variable displacement machines. Different measurement approaches are employed for experimental verification. It is shown that conventional methods are often inadequate for measuring source flow in variable displacement units due to the complex outlet channel. A new method, referred to as the Source admittance method, is proposed.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2005. 164 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 965
Keyword
hydraulic piston pumps
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-31420 (URN)17198 (Local ID)91-85457-15-9 (ISBN)17198 (Archive number)17198 (OAI)
Public defence
2005-10-14, Nobel, Hus B, Campus Valla, Linköpings Universitet, Linköping, 10:15 (English)
Opponent
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2012-12-05Bibliographically approved

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Johansson, AndreasAndersson, JohanPalmberg, Jan-Ove

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