“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

DOI forward links to this article:
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  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}