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Improving wind turbine drivetrain bearing reliability through pre-misalignment

Whittle, M.W.G.; Trevelyan, J; Shin, W.; Tavner, P.J.

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Authors

M.W.G. Whittle

W. Shin

P.J. Tavner



Abstract

Improving the reliability of wind turbines (WT) is an essential component in the bid to minimize the cost of energy, especially for offshore wind because of the difficulties associated with access for maintenance. Numerous studies have shown that WT gearbox and generator failure rates are unacceptably high, particularly given the long downtime incurred per failure. There is evidence that bearing failures of the gearbox high-speed stage (HSS) and generator account for a significant proportion of these failures. However, the root causes of these failure data are not known, and there is therefore a need for fundamental computational studies to support the valuable ‘top down’ reliability analyses. In this paper, a real (proprietary) 2 MW geared WT was modelled to compute the gearbox–generator misalignment and predict the impact of this misalignment upon the gearbox HSS and generator bearings. At rated torque, misalignment between the gearbox and generator of 8500 µm was seen. For the 2 MW WT analysed, the computational data show that the L10 fatigue lives of the gearbox HSS bearings were not significantly affected by this misalignment but that the L10 fatigue lives of the generator bearings, particularly the drive-end bearing, could be significantly reduced. It is proposed to apply a nominal offset to the generator to reduce the misalignment under operation, thereby reducing the loading on the gearbox HSS and generator bearings. The value of performing integrated system analyses has been demonstrated, and a robust methodology has been outlined.

Citation

Whittle, M., Trevelyan, J., Shin, W., & Tavner, P. (2013). Improving wind turbine drivetrain bearing reliability through pre-misalignment. Wind Energy, 17(8), 1217-1230. https://doi.org/10.1002/we.1629

Journal Article Type Article
Publication Date Aug 1, 2013
Deposit Date May 15, 2014
Publicly Available Date May 22, 2014
Journal Wind Energy
Print ISSN 1095-4244
Electronic ISSN 1099-1824
Publisher Wiley Open Access
Peer Reviewed Peer Reviewed
Volume 17
Issue 8
Pages 1217-1230
DOI https://doi.org/10.1002/we.1629
Keywords Wind turbine, Misalignment, Gearbox, Generator, Bearings, Fatigue, Reliability, Availability.

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Copyright Statement
This is the peer reviewed version of the following article: Whittle, M., Trevelyan, J., Shin, W. and Tavner, P. (2013), Improving wind turbine drivetrain bearing reliability through pre-misalignment. Wind Energy, 17 (8): 1217–1230 which has been published in final form at http://dx.doi.org/10.1002/we.1629. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.





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