Journal of Wind Energy (풍력에너지저널)

Korea Wind Energy Association (한국풍력에너지학회)
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State Index of Bearing of Wind Turbine under Variable Loading Conditions to Predict Remaining Useful Life

변화 하중 조건에서의 수명 예측을 위한 풍력발전기 베어링 상태지수

  • 서윤호 (한국기계원구원, 기계시스템안전연구본부) ;
  • 김상렬 (한국기계원구원, 기계시스템안전연구본부) ;
  • 김봉기 (한국기계원구원, 기계시스템안전연구본부) ;
  • 마평식 (한국기계원구원, 기계시스템안전연구본부)
  • Received : 2019.07.29
  • Accepted : 2019.09.04
  • Published : 2019.09.30
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Abstract

This paper suggests an effective state index that represents a quantitative value for damage in order to predict the life of a bearing for a wind turbine. Two fault modes, lubrication failure and rolling element failure, are artificially made in the laboratory. Then, several degradation tests including the measurement of vibration, temperature and torque are performed under both a constant loading condition and stepwise variable loading condition. With the analysis of the measured vibration under the constant loading condition, the root mean square (RMS) value and a vibration component of bearing fault frequency are chosen as good indicators for the prediction of life. Finally, a state index is proposed by the weighted combination of vibration, temperature and torque. The proposed state index is monotonic, increasing as time goes by under the stepwise variable loading condition as well as constant loading condition. Because the monotonicity is a good characteristic to predict the life of bearings in the machine parts of a wind turbine, it is expected that the proposed state index will be helpful for the prediction of the life of bearings.

Keywords

Acknowledgement

본 연구는 2019년도 산업통상자원부의 재원으로 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구 과제입니다. (No. 20163030024510 풍력발전시스템 상태감시 진단시스템 개발, No. 20183010025730 MW급 풍력발전기용 Gear Train 진단 시스템 및 유지보수 기술개발)

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