Preprints
https://doi.org/10.5194/wes-2022-96
https://doi.org/10.5194/wes-2022-96
 
01 Nov 2022
01 Nov 2022
Status: this preprint is currently under review for the journal WES.

Exploring Limiting Factors of Wear in Pitch Bearings of Wind Turbines with Real Scale Tests

Karsten Behnke and Florian Schleich Karsten Behnke and Florian Schleich
  • Fraunhofer IWES, Am Schleusengraben 22, Hamburg, 21029, Germany

Abstract. Oscillating movements under load can cause wear in rolling bearings. Blade bearings of wind turbines are subject to both. To know how to avoid wear in these bearings is important since they ensure the operational safety of the turbine. Oscillations of blade bearings vary in load, speed, and amplitude. The objective of this work is to find limits of these operating parameters with regards to wear occurrence. To this end several tests with real size bearings were carried out. The test parameters are based on typical operating conditions of a reference turbine. The size of the bearings and the test parameters differ from other published test results for oscillating bearings.

The test results show that wear occurs for every tested combination of load, speed, and amplitude of a steady oscillating movement. Even if the wear characteristics differ between tests, each of them resulted in wear. Hence, no wear limits can be defined within typical operating conditions of a wind turbine below which wear does not occur.

Tests with a discontinuity in the steady oscillation movement, however, did not result in wear. Such discontinuities can be longer movements embedded in steady oscillations. They are characteristic to wind turbine operation, where longer movements are a reaction to wind gusts.

Karsten Behnke and Florian Schleich

Status: open (until 13 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2022-96', Anonymous Referee #1, 07 Nov 2022 reply
  • RC2: 'Comment on wes-2022-96', Anonymous Referee #2, 24 Nov 2022 reply
  • RC3: 'Comment on wes-2022-96', Anonymous Referee #3, 29 Nov 2022 reply
  • RC4: 'Comment on wes-2022-96', Anonymous Referee #4, 05 Dec 2022 reply

Karsten Behnke and Florian Schleich

Karsten Behnke and Florian Schleich

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Short summary
The objective of this work is to find limits within typical operating conditions of a wind turbine below wear on the bearing raceway does not occur. It covers the test of blade bearings with an outer diameter of 2.6 m. The test parameters are based on a 3 MW reference turbine and are compared to values from the literature. It could be shown that it can be possible to avoid wear, which again can be used to design a wind turbine controller.