COMPUTER AIDED OPTIMIZATION OF BEARING AND SEALING GAPS IN HYDROSTATIC MACHINES - THE SIMULATION TOOL CASPAR

Authors

  • Uwe Wieczorek Technical University of Hamburg-Harburg, Institute for Aircraft Systems Engineering, Nesspriel 5, 21129 Hamburg, Germany
  • Monika Ivantysynova Technical University of Hamburg-Harburg, Institute for Aircraft Systems Engineering, Nesspriel 5, 21129 Hamburg, Germany

Keywords:

axial piston machine, non-isothermal gap flow, prediction of losses, computer aided design of swash plate machines

Abstract

The simulation tool CASPAR (Calculation of swash plate type axial piston pump and motor) is presented in this pa-per. Based on the simulation of the flow through the lubricating gaps in swash plate type axial piston machines the pres-sure, velocity and temperature fields in the considered gaps can be determined. This allows the calculation of the main losses generated in the machine due to viscous friction and gap flow. The individual gaps are connected in a complex way to each other. The calculation of the gap flow requires the determination of the instantaneous gap heights for all considered gaps. This is realized by solving the motion equation for all moveable parts of the rotating group. For deter-mination of pressure dependent external forces the instantaneous pressure in the displacement chamber is calculated simultaneously. The program further calculates the instantaneous inlet and outlet flow of the swash plate machine for pumping and motoring mode as well as internal volumetric losses.

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Author Biographies

Uwe Wieczorek, Technical University of Hamburg-Harburg, Institute for Aircraft Systems Engineering, Nesspriel 5, 21129 Hamburg, Germany

Uwe Wieczorek Born on June 4th 1968 in Hamburg (Germany) Study of Mechanical Engineering at the TU Hamburg-Harburg. Scientific Employee at the Department of Measurement and Control Engineering of the Gerhard Mercator Univer-sity of Duisburg. Scientific Employee at the Institute for Aircraft Systems Engineering at the Technical University of Hamburg-Harburg.

Monika Ivantysynova, Technical University of Hamburg-Harburg, Institute for Aircraft Systems Engineering, Nesspriel 5, 21129 Hamburg, Germany

Monika Ivantysynova Born on December 11th 1955 in Polenz (Germany). She received her MSc. Degree in Mechanical Engineering and her PhD. Degree in Hydraulics from the Slovak Technical University of Bratislava, Czechoslovakia. After 7 years in fluid power industry she returned to university. In April 1996 she received a Professorship in fluid power & control at the University of Duisburg (Germa-ny). At present she is Professor of Mechatron-ic Systems at the Technical University of Hamburg-Harburg. Her research centres around the optimisation of displacement machines, advanced system design and motion control as well as modelling, simula-tion and testing of fluid power systems. Besides the book “Hydrostatic Pumps and Motors” published in German and English, she has published approximately 45 papers in technical journals and at international confer-ence

References

Blackman, L.D. 2001. Detailed Dynamic Model for Variable Displacement Pumps – a new approach with Simulink. Proc. Recent Advances in Aerospace Actuation Systems and Components. Toulouse, France, pp. 33-40.

Böninghoff O. 1972. Das Reibverhalten der Kolben und der Gleitschuhe in Schrägscheiben-Axialkolbenmaschinen. PhD Thesis, University of Braunschweig, Germany.

Fang Y. and Shirakashi M. 1995. Mixed Lubrication Characteristics between the Piston and Cylinder in Hydraulic Piston Pump-Motor. Journal of Tribolo-gy, Trans. ASME, Vol. 117, pp. 80-85.

Harris, M. R., Edge, K. A. and Tilley, D. G. 1993. Predicting the Behaviour of Slipper Pads in Swash-plate-Type Axial Piston Pumps. ASME Winter An-nual Meeting, New Orleans, Louisiana. 93-WA/FPST-3.

Ivantysyn J. and Ivantysynova M. 2001. Hydrostatic Pumps and Motors. Academic Books International, New Dehli, India.

Ivantysynova, M. 1999. A New Design to the Design of Sealing and Bearing Gaps of Displacement Ma-chines. 4th JHPS International Symposium on Fluid Power, Tokyo, Japan.

Ivantysynova, M. 2001. Energy Losses of Modern Displacement Machines- a Approach of Modelling. 7th Scandinavian International Conference on Fluid Power, Linköping, Sweden, 2001, pp. 377-395.

Ivantysynova M. and Lasaar R. 2000. Ein Versuchträger zur Messung der Reibkräfte zwischen Kolben und Zylinder in Axialkolbenmaschinen. Konstruktion, Vol. 52, No. 6, pp. 57-65.

Kleist A. 1997. Design of Hydrostatic Static Bearing and Sealing Gaps in Hydraulic Machines. 5th Scan-dinavian International Conference on Fluid Power, Lingköping, Sweden.

Krasser J., Laback O., Loinbennegger B. and Priebsch H. 1994. Anwendung eines elastohydrodynamischen Verfahrens zur Berechnung von Kurbeltriebslagern. Motortechnische Zeitschrift, Vol. 55, pp. 656-663.

Lasaar, R. and Ivantysynova, M. 2002. Advanced Gap Design – Basis for Innovative Displacement Machines. 3rd International Fluid Power Confer-ence, Aachen, Germany, pp. 215-229.

Lasaar, R. 2000. The influence of the Micro and Macro Geometry on the Energy Dissipation in the Lubricating Gaps of Displacement Machines. Proc. of 1st FPNI PhD Symposium Hamburg 2000, pp. 101-116.

Liu, M. 2001. Dynamisches Verhalten hydrostatischer Axialkolbengetriebe. PhD thesis. Ruhr-Universität Bochum, Germany.

Olems L. 2000 Investigation of the Temperature Be-haviour of the Piston Cylinder Assembly in Axial Piston Pumps. International Journal of Fluid Pow-er, Vol. 1 (2000), No. 1, pp. 27-38.

Patankar S. V. 1980. Numerical Heat Transfer and Fluid Flow. New York, Washington: Hemisphere Publishing Corporation.

Renius K. T. 1974. Untersuchungen zur Reibung zwischen Kolben und Zylinder bei Schrägscheiben-Axialkolbenmaschinen. VDI-Forschungsheft 561. Düsseldorf: VDI-Verlag, Germany.

Sanchen G. 1999 Simulationswerkzeug zur Auslegung von Axialkolbenpumpen in Schrägscheibenbauweise. O+P Ölhydraulik und Pneumatik, Vol. 43. Nr. 4, pp. 292-297.

Wieczorek U. and Ivantysynova M. 2000. CASPAR – A computer aided design tool for axial piston ma-chines. Proc. Bath Workshop on Power Transmis-sion and Motion Control PTMC 2000, Bath, UK, pp. 113-126.

Wieczorek U. 2000. Simulation of the Gap Flow in the Sealing and Bearing Gaps of Axial Piston Ma-chines. Proc. of 1st FPNI-PhD Symposium Ham-burg 2000, pp. 493-507.

Zhu D., Cheng H. S., Arai T. and Hamai K. 1992. A numerical analysis for piston skirt in mixed lubrica-tion. Journal of Tribology Part I and II, Vol. 114 and 115, pp. 553-562 and 125-133.

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Published

2002-03-01

How to Cite

Wieczorek, U., & Ivantysynova, M. (2002). COMPUTER AIDED OPTIMIZATION OF BEARING AND SEALING GAPS IN HYDROSTATIC MACHINES - THE SIMULATION TOOL CASPAR. International Journal of Fluid Power, 3(1), 7–20. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/626

Issue

2002: Vol 03 Iss 1

Section

Original Article

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