“Numerical and Experimental Study of Friction Loss in Hydrostatic Motor”

Authors: Rasmus M. Sørensen, Michael R. Hansen and Ole Ø. Mouritsen,
Affiliation: Liftra Aps, Aalborg University and University of Agder
Reference: 2012, Vol 33, No 3, pp. 99-109.

Keywords: Hydrostatic motor, friction loss, mixed lubrication, experimental verification

Abstract: This paper presents a numerical and experimental study of the losses in a hydrostatic motor principle. The motor is designed so that the structural deflections and lubricating regimes between moving surfaces and, subsequently, the leakage and friction losses, can be controlled during operation. This is done by means of additional pressure volumes that influence the stator deflection. These pressures are referred to as compensation pressures and the main emphasis is on friction or torque loss modeling of the motor as a function of the compensation pressures and the high and low pressures related to the load torque. The torque loss modeling is identified as a Stribeck curve which depends on gap height. The asperity friction is decreasing exponentially with an increase in gap height. The parameters of the torque loss model are based on prototype measurements that include the structural deflections of the lubricating gap faces.

PDF PDF (575 Kb)        DOI: 10.4173/mic.2012.3.2

DOI forward links to this article:
[1] Christian Nørgård, Michael Møller Bech, Torben Ole Andersen and Jeppe Hals Christensen (2018), doi:10.4173/mic.2018.1.3
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[1] Bayer, R. (1994). Mechanical Wear Prediction and Prevention, Marcel Dekker.
[2] Beschorner, K., Higgs, C., Lovell, M. (2009). Solution of reynolds equation in polar coordinates applicable to nonsymmetric entrainment velocities, Journal of Tribology, 131.
[3] Gelinck, E. Schipper, D. (2000). Calculation of Stribeck curves for line contacts, Tribology International, 33:175--181 doi:10.1016/S0301-679X(00)00024-4
[4] Ivantysyn, J. Ivantysynova, M. (2003). Hydrostatic Pumps and Motors: Principles, Design Performance, Modelling, Analysis, Control and Testing, Tech Books International.
[5] Ivantysynova, M. (2003). Prediction of pump and motor performance by computer simulation, First International Conference on Computational Methods in Fluid Power Technology.
[6] McCandlish, D. Dorey, R. (1984). The mathematical modelling of hydrostatic pumps and motors, Proc Instn Mech Engrs, 198.10.
[7] Murrenhoff, H., Piepenstock, U., Kohmäscher, T. (2008). Analysing losses in hydrostatic drives, Proceedings of the 7th JFPS International Symposium on Fluid Power.
[8] Sørensen, R., Hansen, M., Mouritsen, O. (2011). Hydraulic yaw system for wind turbines with new compact hydraulic motor principle, EWEA 2011 Scientific Proceedings, pp. 111--114.
[9] Sørensen, R., Hansen, M., Mouritsen, O. (2012). Numerical and experimental study of hydrostatic displacement machine, International Journal of Fluid Power, 1.2:29--40.
[10] Wang, Y. Wang, Q. (2006). Development of a set of Stribeck curves for conformal contacts of rough surfaces, Tribology Transactions, 49:526--535 doi:10.1080/10402000600846110
[11] Wilson, W. (1946). Rotary pump theory, Transaction of the ASME, pp. 371--383.

  title={{Numerical and Experimental Study of Friction Loss in Hydrostatic Motor}},
  author={Sørensen, Rasmus M. and Hansen, Michael R. and Mouritsen, Ole Ø.},
  journal={Modeling, Identification and Control},
  publisher={Norwegian Society of Automatic Control}