TY - JOUR

T1 - Wear Development in Oscillating Rolling Element Bearings

AU - Wandel, Sebastian

AU - Bartschat, Arne

AU - Glodowski, Jakob

AU - Bader, Norbert

AU - Poll, Gerhard

N1 - Funding Information: This document is a result of the research projects “iBAC—Intelligent Blade Bearing Amplitude Control” (grant number: 0324344A) and “HBDV—Highly Loaded Slewing Bearings” (grant number: 0324303A) funded by the Federal Ministry for Economic Affairs and Climate Action (Federal Republic of Germany) and of the project.

PY - 2023/3/7

Y1 - 2023/3/7

N2 - Rotor blade bearings enable rotor blades to pivot about their longitudinal axis and thus control the power output and reduce the loads acting on the wind turbine. Over a design period of 20 years, rolling bearings are exposed to frequent oscillation movements with amplitude ratios of (Formula presented.) > 1, especially due to new control concepts such as Individual Pitch Control, which can lead to wear and a reduction in service life. The objective of this paper was to identify the dominant wear mechanisms and their consequences for the operation of oscillating bearings. Oscillating experiments with an increasing number of cycles on the angular contact ball bearings of two different sizes (types 7208 and 7220) show that the damage initiation starts with adhesive and corrosive wear mechanisms, which result in a sharp increase in the torque as well as the wear volume on the bearing raceway. As the number of cycles increases, an abrasive mechanism occurs, resulting in a lower slope of the wear curve and a smoothing of the resulting wear depressions. The wear and torque curves were evaluated and classified using an energy-wear approach according to Fouvry.

AB - Rotor blade bearings enable rotor blades to pivot about their longitudinal axis and thus control the power output and reduce the loads acting on the wind turbine. Over a design period of 20 years, rolling bearings are exposed to frequent oscillation movements with amplitude ratios of (Formula presented.) > 1, especially due to new control concepts such as Individual Pitch Control, which can lead to wear and a reduction in service life. The objective of this paper was to identify the dominant wear mechanisms and their consequences for the operation of oscillating bearings. Oscillating experiments with an increasing number of cycles on the angular contact ball bearings of two different sizes (types 7208 and 7220) show that the damage initiation starts with adhesive and corrosive wear mechanisms, which result in a sharp increase in the torque as well as the wear volume on the bearing raceway. As the number of cycles increases, an abrasive mechanism occurs, resulting in a lower slope of the wear curve and a smoothing of the resulting wear depressions. The wear and torque curves were evaluated and classified using an energy-wear approach according to Fouvry.

KW - false brinelling

KW - grease lubrication

KW - oscillating bearing

KW - pitch bearing

KW - wear

UR - http://www.scopus.com/inward/record.url?scp=85152286922&partnerID=8YFLogxK

U2 - 10.3390/lubricants11030117

DO - 10.3390/lubricants11030117

M3 - Article

AN - SCOPUS:85152286922

VL - 11

JO - Lubricants

JF - Lubricants

SN - 2075-4442

IS - 3

M1 - 117

ER -