Effects of Wind Field Characteristics on Pitch Bearing Reliability: A Case Study of 5 MW Reference Wind Turbine at Onshore and Offshore Sites

Ashkan Rezaei, Yi Guo, Jonathan Keller, Amir R. Nejad

Research output: Contribution to journalArticlepeer-review

3 Scopus Citations

Abstract

This paper presents a study on pitch bearing basic rating life affected by wind field characteristics at both onshore and offshore wind sites. The National Renewable Energy Laboratory 5 MW reference wind turbine is selected for the study. Wind field characteristics including reference hub height mean wind speed, wind speed distribution, wind shear, and vertical inflow are studied. A decoupled approach is employed where global analysis is performed first. Second, the load effects from the global analysis are applied on a reference pitch bearing designed based on best industrial practices. For the case study onshore site, it is found that the Kernel density estimation best fits the wind distribution, while the International Electrotechnical Commission proposed distribution appears to be not suitable. Moreover, it is shown that the seed number has high effect on the bearing life in turbulence wind and the wind speeds around rated have the highest contribution in both bearing fatigue damage and extreme load failure. The results contribute to better understanding of the wind field characteristics on the pitch bearing life.

Original languageAmerican English
Pages (from-to)321-338
Number of pages18
JournalForschung im Ingenieurwesen/Engineering Research
Volume87
Issue number1
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023, The Author(s).

NREL Publication Number

  • NREL/JA-5000-84795

Keywords

  • pitch bearing
  • wind field characteristics
  • wind turbine

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