Endurance test strategies for pitch bearings of wind turbines

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Stammler, Matthias: Endurance test strategies for pitch bearings of wind turbines. Stuttgart : Fraunhofer Verlag, 2020, x, 132 S.

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To cite the version in the repository, please use this identifier: https://doi.org/10.15488/10080

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Sum total of downloads: 280




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Abstract: 
Modern wind turbines turn their blades along their primary axis to control the conversion ofaerodynamic power. The pitch bearings connect the rotor hub of the turbine with the bladesand allow this rotation. They are large slewing bearings with diameters in the range of 2 - 7 m.In comparison to bearings in other applications, pitch bearings suffer from three particularities:Oscillating movements instead of full rotations, dynamic and stochastic loads in five degrees offreedom instead of controlled loads, and interface parts with low and complex stiffness along thecircumference instead of almost stiff connections.The capital costs of the bearings and even more the costs connected to failures make it paramountto mitigate operational risks of new designs. As there are no established calculation methods forthe most dominant damage modes of pitch bearings, bearing tests are of critical value to this riskmitigation.This work covers the design of endurance test runs for pitch bearings. A true endurance test runof pitch bearings should result in a profound evaluation of the risk of failure during the lifetime ofthe wind turbine. This goal makes the design of an endurance run a substantial task. It gets evenmore challenging when such a test run needs to fit into the overall turbine design process, both inmatters of timing and finance.This work results in a test run profile that covers wear and fatigue damage modes of the bearingrollers and raceways, among others. It also covers the development and commissioning of the testenvironment for different bearing sizes. The IWT7.5-164 reference turbine serves as example forthe design of the test environment and the test run.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: doctoralThesis
Publishing status: publishedVersion
Issue Date: 2020
Appears in Collections:Fakultät für Bauingenieurwesen und Geodäsie
Dissertationen

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pos. country downloads
total perc.
1 image of flag of Germany Germany 155 55.36%
2 image of flag of China China 34 12.14%
3 image of flag of Spain Spain 22 7.86%
4 image of flag of Sweden Sweden 19 6.79%
5 image of flag of United States United States 9 3.21%
6 image of flag of Denmark Denmark 9 3.21%
7 image of flag of United Kingdom United Kingdom 8 2.86%
8 image of flag of Romania Romania 5 1.79%
9 image of flag of India India 3 1.07%
10 image of flag of Norway Norway 2 0.71%
    other countries 14 5.00%

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