Abstract
Wind turbines (WT) must be further optimized concerning availability and reliability. One of the major reasons of WT downtime is the failure of gearbox bearings. Some of these failures occur, due to the ring creep phenomenon, which is mostly detected in the planetary bearings. The ring creep phenomenon describes a relative movement of the outer ring to the planetary gear. In order to improve the understanding of ring creep, the finite element method (FEM) is used to simulate ring creep in planetary gears. First, a sensitivity analysis is carried out on a small bearing size (NU205), to characterize relevant influence parameters for ring creep—considered parameters are teeth module, coefficient of friction, interference fit and normal tooth forces. Secondly, a full-scale planetary bearing (SL185030) of a 1MW WT is simulated and verified with experimental data.
Highlights
The wind industry is a major pillar of climate-friendly energy supply in Germany
Non-uniform gear load distribution as well as multiplerow bearing concepts, as commonly used in Wind turbines (WT) planetary gears, have been identified as highly relevant influences on ring creep [8], but until now, simulations could not be validated for a full-size wind turbine planetary bearing under realistic load conditions
For the first time a validation of a ring creep simulation for a full-size wind turbine planetary bearing is presented in this paper, which is based on the experimental results of [2,3,4]
Summary
The wind industry is a major pillar of climate-friendly energy supply in Germany. To achieve a fully climate-friendly energy supply in Germany, it is important to ensure that the wind industry continues its growth and becomes even more. Non-uniform gear load distribution as well as multiplerow bearing concepts, as commonly used in WT planetary gears, have been identified as highly relevant influences on ring creep [8], but until now, simulations could not be validated for a full-size wind turbine planetary bearing under realistic load conditions. For the first time a validation of a ring creep simulation for a full-size wind turbine planetary bearing is presented in this paper, which is based on the experimental results of [2,3,4]
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