Pitch bearing case study with supervisory control data of 7MW wind turbine

Song, Won Joon; Karikari-Boateng, Kwaku Ampea; Lee, H.

doi:10.1201/9781003134572-59

Cited by 1 publication

(3 citation statements)

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“…The parameters differ mainly in the double oscillating amplitude θ that was chosen to be 0.7 (x/2b = 2.67) and 3.0 (x/2b =11.44). These values are typical for modern wind turbine pitch bearings 10,36,54,55 and can be reproduced with the test bench.…”

Section: Experimental Approachmentioning

confidence: 87%

“…The oscillating frequency of 0.5 Hz was kept constant for all the experiments. Both bearing types were tested under a maximum contact pressure of 2 GPa, which represents typical pitch bearing operating conditions 10,13,36,54,55 . Due to the different contact geometry and contact angle of the bearing types and the adapted number of rolling elements for each type, the same axial load was applied for both bearings to reach 2 GPa.…”

Section: Experimental Approachmentioning

confidence: 99%

“…Both bearing types were tested under a maximum contact pressure of 2 GPa, which represents typical pitch bearing operating conditions. 10,13,36,54,55 Due to the different contact geometry and contact angle of the bearing types and the adapted number of rolling elements for each type, the same axial load was applied for both bearings to reach 2 GPa. As the test duration was limited, there was no re-lubrication of the bearings during the tests.…”

Section: Experimental Approachmentioning

confidence: 99%

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Wear in wind turbine pitch bearings—A comparative design study

et al. 2021

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We tested two types of ball bearings with an outer diameter of 750 mm to learn more about the challenges of oscillating motions for pitch bearings. The experimental conditions are derived from aero‐elastic simulations, long‐term wind speed measurements and a scaling method that considers loads and pitch angles. As a result, the parameters relevant for pitch bearings are represented appropriately, and the findings are transferable to other bearing sizes. For the tested parameter sets, severe wear occurred for over 90% of the exposed contact areas after 12 500 oscillating cycles. Decreasing the number of cycles to 1250 leads to a mix of exposed areas with 13% severe wear, 32% mild wear and 55% no wear, with no apparent pattern. The results demonstrate that a comparatively small amount of consecutive cycles can lead to severe wear. A new type of bearing tested showed less wear for the selected operating conditions.

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Section: Experimental Approachmentioning

confidence: 87%

Section: Experimental Approachmentioning

confidence: 99%