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Optimal design of the cross-angle for pulsation reduction in variable displacement 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.
2002 (English)In: Power Transmission and Motion Control: PTMC 2002 / [ed] Burrows, C. R. and Edge, K. A, Wiley-Blackwell, 2002, 319-333 p.Conference paper, Published paper (Refereed)
Abstract [en]

The cross-angle, illustrated in this paper, is a fixed displacement angle around the axis perpendicular to the normal trunnion axis. With the cross-angle, the traditional piston dead centres will change as the normal displacement angle is varied. The result is a behaviour similar to thal of the revolving valve plate technique. but without any movable parts. When the cross-angle is used in a constant pressure system with a variable pump, the desired dead centre for optimal pro-compression coincides with the obtained dead centre for a wide range of displacement angles. This implies that when the cross-angle is used, the flow ripple becomes less sensitive to changes in displacement angles. The cross-angle does not constitute an alternative to the different design features developed, but rather as complement for preserved effective flow ripple reduction over a wide range of displacement angles.

ln this study. simulation-based optimisations, employing non-gradient optimisation techniques such as genetic algorithms and the Complex method, are used in order to find the optimal cross-angle for a variable displacement pump. Furthermore. with the help of optimisation, the trade-offs between attributes such as low flow ripples, avoidance of large cylinder pressure-peaks, and cavitation have been studied. Increased insight is thereby gained into what possibilities the cross-angle offers regarding reduction of pump ripple for a variable displacement pump.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2002. 319-333 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-36697Local ID: 32178ISBN: 1860583792 (print)ISBN: 978-1860583797 OAI: oai:DiVA.org:liu-36697DiVA: diva2:257546
Conference
Bath Workshop on Power Transmission and Motion Control (PTMC 2002), September 2002, Bath, UK
Available from: 2009-10-10 Created: 2009-10-10 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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