Download or read book WhiteWind White Etching Crack WEC Bearing Failures in Wind Turbine Cooperative Research and Development Final Report CRADA Number CRD 18 00758 written by and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A WEC is a particularly aggressive, unpredictable and wide spread rolling element bearing failure mode that is common for large multi-megawatt (MW) wind turbines. WEC is considered the single most expensive failure mode for all wind turbine components, and there is currently no commercial solution. The Technical University of Denmark (DTU) is leading the WhiteWind project to investigate WECs through funding provided by the Innovation Fund Denmark. Other project partners include Vestas, SKF, Expanite, Rheinisch-Westfalische Technische Hochschule Aachen University (RWTH Aachen), and Argonne National Laboratory. The objective of the overall project is to develop a new surface engineered WEC-resistant bearing material using novel surface engineering techniques that shall provide a commercially competitive alternative to existing wind turbine bearings. NREL will support the project by providing existing measured bearing loads and validating models of drivetrain loads.
Download or read book Elucidating the Mechanisms of White Etching Crack Failures Within Wind Turbine Gearbox Bearings written by Benjamin J. Gould and published by . This book was released on 2019 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, Chapter 10 investigated the effect that a proposed mitigation technique, namely case-carburization, had on the formation of WECs. It is found that employing case-carburization led to a 2.3x elongation in the time until WEC-induced failure.
Download or read book Investigating the Process of White Etching Crack Initiation in Bearing Steel written by and published by . This book was released on 2016 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: White etching cracks (WECs) have been identified as a dominant mode of premature failure within wind turbine gearbox bearings. Though WECs have been reported in the field for over a decade, the conditions leading to WECs, and the process by which this failure culminates, are both highly debated. In previously published work, the generation of WECs on a benchtop scale was linked to sliding at the surface of the test sample, it was also postulated that the generation of WECs was dependent on the cumulative energy that had been applied to the sample over the entirety of the test. In this paper, a three ring on roller bench top test rig is used to systematically alter the cumulative energy that a sample experiences through changes in normal load, sliding, and run time, in an attempt to correlate cumulative energy with the formation of WECs. It was determined that, in the current test setup, the presence of WECs can be predicted by this energy criterion. The authors then used this information to study the process by which WECs initiate. Lastly, it was found that, under the current testing conditions, the formation of a dark etching microstructure precedes the formation of a crack, and a crack precedes the formation of white etching microstructure.
Download or read book Wind Turbine Blade Fatigue Analysis for Development of Predictive Life Models Cooperative Research and Development Final Report CRADA Number CRD 17 00696 written by and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Small Business Voucher CRADA will focus on wind turbine blade fatigue analysis for development of predictive life models. The parties will cooperate to conduct structural validation fatigue testing that produces high quality data enabling validation of blade damage models with sensing technologies developed by Sentient.
