Enhanced test strategy of pitch bearing based on detailed motion profile

Wear in wind turbine pitch bearings—A comparative design study

“…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.…”

“…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.…”

“…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.…”

Rating of a Pitch Bearing for a 1.5-Megawatt Wind Turbine

“…Large-diameter pitch bearing tests have been conducted to determine friction torque (González et al 2008;Han et al 2015;Menck et al 2022) and fatigue lives and wear characteristics (Handreck et al 2015;Becker et al 2017;Grebe et al 2018;He et al 2018;Schwack, Prigge, and Poll 2018;Fischer and Mönnig 2019;Schwack et al 2020;Schwack et al 2021;Song and Karikari-Boateng 2021). Other assessments have been made of the turbine controller characteristics Menck, Stammler, and Schleich 2020;Stammler et al 2020) and stiffening plates (Loriemi et al 2020).…”

Instrumentation for the Investigation of Pitch Bearing Design and Reliability

“…Significant work has been done to investigate the fatigue lives and wear characteristics of pitch bearings on ground-based test rigs (Handreck et al 2015;Becker et al 2017;Grebe et al 2018;He et al 2018;Liu et al 2018;Schwack, Prigge, and Poll 2018;Fischer and Mönnig 2019;Schwack et al 2020Schwack et al , 2021Song and Karikari-Boateng 2021;Bartschat, Behnke, and Stammler 2023;Becker et al 2023;Behnke and Schleich 2023;Graßmann, Schleich, and Stammler 2023;de la Presilla et al 2023). NREL has also recently begun a research program related to studying pitch bearing reliability, as its importance grows for wind turbines.…”