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Flow pulsation reduction for variable displacement motors using cross-angle
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
2007 (English)In: Power Transmission and Motion Control (PTMC 2007) / [ed] D. N. Johnston, and A. Plummer, Essex: Hadleys Ltd , 2007, 103-116 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper considers using the cross-angle in variable displacement hydraulic machines. The cross-angle is a fixed displacement angle around the axis perpendicular to the normal displacement direction. The cross-angle changes the angles to the pistons top and bottom dead centres as a function of the fraction of displacement in such a way that the valve plate timing is varied and different pre-compression and decompression angles are obtained. A non-gradient optimisation technique, the Complex method, is used together with a comprehensive simulation model in order to find the optimal cross-angle for a variable displacement hydraulic motor. The paper shows that the cross-angle can be used to reduce noise in variable displacement motors. One issue that makes the motor application more difficult is the increased dependence between outlet and inlet flow ripple which is not found in pump applications. Furthermore, the paper discusses how to use the cross-angle for machines which can work both as a motor and a pump.

Place, publisher, year, edition, pages
Essex: Hadleys Ltd , 2007. 103-116 p.
Keyword [en]
Cross-angle flow pulsations noise hydraulic pump hydraulic motor
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-40965Local ID: 54778ISBN: 978-0-86197-140-4 (print)OAI: oai:DiVA.org:liu-40965DiVA: diva2:261814
Conference
Power Transmission and Motion Control (PTMC 2007), 12-14 September, Bath, UK
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-11-08
In thesis
1. On Fluid Power Pump and Motor Design: Tools for Noise Reduction
Open this publication in new window or tab >>On Fluid Power Pump and Motor Design: Tools for Noise Reduction
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Noise and vibration are two of the main drawbacks with fluid power  systems. The increasing requirements concerning working environment as well as machines' impact on surroundings put components and systems to harder tests. The surrounding machines, e.g. combustion engines, have made considerable progress regarding the radiated noise. This allows the fluid power system's noise to become more prominent. Noise from fluid power systems has been a research topic for several decades and much improvement has been achieved. However, considerable potential for improvement still remains.

In addition to the legislation governing working environment, the machines tend to be used as more multi-quadrant machines, which require more flexible noise reduction features. One of the main benefits with fluid power is the high power density. To increase this value even more, the system's working pressure increases, which correlates with increased noise level.

The main source of noise is considered to be the pump and motor unit in the fluid power system. The noise can be divided into two parts: fluid-borne noise and structure-borne noise. The fluid borne noise derives from flow pulsation which is subsequently spread through pipeline systems to other parts of the fluid power systems. The flow pulsation is created due to the finite stiffness of oil and the limited number of pumping elements. The structure-borne noise generates directly from pulsating forces in the machine. The pulsating forces are mainly created by the pressure differences between high and low pressure ports.

Effective and accurate tools are needed when designing a quiet pump/motor unit. In this thesis simulation based optimisation is used with different objective functions including flow pulsation and pulsating forces as well as audible noise. The audible noise is predicted from transfer functions derived from measurements. Two kinds of noise reduction approaches are investigated; cross-angle in multi-quadrant machines and non-uniform placement of pistons. The simulation model used is experimentaly validated by source flow measurements. Also, source flow measurements with the source admittance method are investigated.

In addition, non-linear flow through a valve plate restrictor is investigated and the steady state restrictor equation is proposed to be extended by internal mass term.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 130 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1417
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-73981 (URN)978-91-7519-994-8 (ISBN)
Public defence
2012-01-20, Sal A35, Hus A, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2012-01-18Bibliographically approved
2. Flow Pulsations in Fluid Power Machines - a Measurement and Simulation Study
Open this publication in new window or tab >>Flow Pulsations in Fluid Power Machines - a Measurement and Simulation Study
2008 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Stricter requirements for better working environment involve noise and vibration control of hydraulic machines. The operational conditions for hydraulic machines, such as pressure and rotational speed, are also increasing and this makes it even more difficult to develop a quiet, vibration-free machine due to the interdependence between noise and escalating operational conditions. The thesis investigates machines working in different driving modes and under different operational conditions.

A so-called cross-angle is proposed for motor as well as pump/motor applications with variable displacement angles. The cross-angle is intended to reduce the overall noise level in the machine's working area. Other noise reduction features are also considered for machines working in different modes.

To facilitate the system integrator's ability to design quiet systems, methods to determine the source flow and source impedance of the machine are essential. The source flow is assumed to be created at the valve plate and the internal impedance related to the high pressure port are completely independent of the rest of the system. Knowledge of these properties makes it possible to foresee the noise properties of a system already on the design phase. A novel source flow measurement method, the source admittance method, is investigated here. The method is considered to be robust and easy to use to suit industry requirements.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2008. 74 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1355
Keyword
noise, pump, motor, measurement, optimisation
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-42325 (URN)62599 (Local ID)978-91-7393-938-6 (ISBN)62599 (Archive number)62599 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-11-08

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Ericson, LiselottÖlvander, JohanPalmberg, Jan-Ove

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