“Lifetime Calculation of Irregularly Oscillating Bearings in Offshore Winches”

Authors: Lothar Wöll, Georg Jacobs and Achim Kramer,
Affiliation: RWTH Aachen
Reference: 2018, Vol 39, No 2, pp. 61-72.

Keywords: Oscillation, Lifetime, Reliability, Offshore, Gearbox, Winch, Active Heave Compensation

Abstract: The fatigue lifetime calculation of rolling bearings has been intensively researched in the past and has been well documented in standards. The majority of the conducted research in the field of bearing life expectancy only applies to bearings under continuously rotating conditions as can be found in many technical systems, such as vehicle transmissions. However, there are many other technical applications in which bearings perform oscillating motions, for which the fatigue life calculation is currently not standardized. For such oscillatory behaviour, there exist several modifications for the standardized lifetime calculation. The available modification approaches, however, assume purely sinusoidal oscillations. Thus, irregular non-sinusoidal oscillations require approximation with a simple sinusoidal oscillation to comply with the available approaches, which can lead to a loss of information. In this paper, a numerical calculation approach to modify the lifetime calculation for oscillating bearings underlying irregularly reversing speeds and varying loads is presented. The lifetime calculation results of this approach are compared to results of existing calculation approaches for fatigue life calculation of oscillating bearings. For this, the approaches are applied on simple sinusoidal speeds and loads. Subsequently, results of all calculation approaches are shown for irregularly varying speeds and loads, using the example of the drivetrain of an offshore crane winch with Active Heave Compensation~(AHC). The calculation results indicate, that available lifetime modification approaches for oscillating bearings seem to overestimate the lifetime for irregularly oscillating conditions.

PDF PDF (792 Kb)        DOI: 10.4173/mic.2018.2.2

[1] Grote, K.-H. and Feldhusen, J. (2011). Grote, K, -H. and Feldhusen, J. Dubbel. Springer, Berlin, Heidelberg. doi:10.1007/978-3-642-17306-6
[2] Harris, T.A. and Kotzalas, M.N. (2007). Harris, T, A. and Kotzalas, M.N. Essential Concepts of Bearing Technology, volume1 of Rolling bearing analysis. Taylor & Francis, Boca Raton, 5. ed. edition. .
[3] Harris, T.A., Rumbarger, J.H., and Butterfield, C.P. (2009). Harris, T, A., Rumbarger, J.H., and Butterfield, C.P. Wind Turbine Design Guideline DG03: Yaw and Pitch Rolling Bearing Life. 2009. doi:10.2172/969722
[4] Houpert, L. (1999). Houpert, L, Bearing Life Calculation in Oscillatory Applications. Tribology Transactions. 42(1):136--143. doi:10.1080/10402009908982200
[5] ISO 281. (2007). ISO 281, Rolling bearings - Dynamic load ratings and rating life. 2007. .
[6] Journee, J. M.J. and Massie, W.W. (2001). Journee, J, M.J. and Massie, W.W. Offshore Hydromechanics. Delft University of Technology, first edition. .
[7] Lundberg, G. and Palmgren, A. (1947). Lundberg, G, and Palmgren, A. Dynamic Capacity of Rolling Bearings, volume 1:3 of Acta polytechnica Mechanical engineering series. Stockholm. .
[8] Neumann, S., Woell, L., Feldermann, A., Strassburger, F., and Jacobs, G. (2016). Neumann, S, , Woell, L., Feldermann, A., Strassburger, F., and Jacobs, G. Modular System Modeling for Quantitative Reliability Evaluation of Technical Systems. Modeling, Identification and Control. 37(1):19--29. doi:10.4173/mic.2016.1.2
[9] Rumbarger, J.H. and Jones, A.B. (1968). Rumbarger, J, H. and Jones, A.B. Dynamic Capacity of Oscillating Rolling Element Bearings. Journal of Lubrication Technology. 90(1):130. doi:10.1115/1.3601528
[10] Schaeffler. (2014). Schaeffler, Rolling bearings: Catalogue HR 1. Schaeffler Technologies AG & Co. KG. .
[11] Woell, L., Feldermann, A., and Jacobs, G. (2017). Woell, L, , Feldermann, A., and Jacobs, G. Sensitivity Analysis on the Reliability of an Offshore Winch Regarding Selected Gearbox Parameters. Modeling, Identification and Control, 2017. 38(2):51--58. doi:10.4173/mic.2017.2.1
[12] Woell, L., Jacobs, G., Feldermann, A., Neumann, S., and Strassburger, F. (2017). Woell, L, , Jacobs, G., Feldermann, A., Neumann, S., and Strassburger, F. Einfluss der Wellenhoehe auf die Zuverlassigkeit einer Offshore-Winde. In G.Jacobs, editor, Antriebstechnisches Kolloquium 2017, Antriebstechnisches Kolloquium. Books on Demand, Norderstedt, pages 59--70, 2017. .
[13] Woell, L., Schick, K., Jacobs, G., Kramer, A., and Neumann, S. (2017). Woell, L, , Schick, K., Jacobs, G., Kramer, A., and Neumann, S. Reliability Evaluation of Drivetrains: Challenges for Off--Highway Machines. In C.Volosencu, editor, System Reliability. InTech, 2017. doi:10.5772/intechopen.70280

  title={{Lifetime Calculation of Irregularly Oscillating Bearings in Offshore Winches}},
  author={Wöll, Lothar and Jacobs, Georg and Kramer, Achim},
  journal={Modeling, Identification and Control},
  publisher={Norwegian Society of Automatic Control}