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Comparison of life calculations for oscillating bearings considering individual pitch control in wind turbines

: Schwack, F.; Stammler, M.; Poll, G.; Reuter, A.

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TU München; European Academy of Wind Energy -EAWE-:
6th International Conference "The Science of Making Torque from Wind", TORQUE 2016 : 5-7 October 2016, Munich, Germany; Proceedings
Bristol: IOP Publishing, 2016 (Journal of physics. Conference series 753)
Art. 112013, 10 S.
International Conference "The Science of Making Torque from Wind" (TORQUE) <6, 2016, Munich>
Bundesministerium fur Wirtschaft und Energie BMWi (Deutschland)
0325918A; HAPT
Beschleunigte Dauerprüfung von Blattlagern für Multi-Megawatt-Turbinen
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IWES ()

The fatigue life calculation of bearings under rotating conditions has been well researched and standardized. In contrast, for bearings in oscillating applications no international standards exist. As a result, pitch bearings in wind turbines are designed with different, non standardized approaches. Furthermore, the impact of individual pitch control on pitch bearings has not yet been studied. In this paper four approaches for fatigue life calculation will be applied and compared under individual pitch control conditions. For comparison, the loads and the bearing geometry of the reference turbine IWT 7.5 MW, which is individual pitch controlled, are used. This paper will show how the bearing life calculated by different approaches reacts to individual pitch control conditions. Furthermore, the factors for the modified rating life, according to the ABMA and ISO standards, which implement different operation conditions on the bearings in rotating applications, are calculated for the given loads and the given bearing geometry in oscillating applications.