풍력에너지 저널 (Journal of Wind Energy)

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Info. Vol.10 - No.3 (2019.09.30)
DOI kwea.2019.10.3.003
Title 변화 하중 조건에서의 수명 예측을 위한 풍력발전기 베어링 상태지수(State Index of Bearing of Wind Turbine under Variable Loading Conditions to Predict Remaining Useful Life)
Authors 서윤호*․김상렬**․김봉기**․마평식**
Institutions * 한국기계연구원, 기계시스템안전연구본부(교신저자), ** 한국기계연구원, 기계시스템안전연구본부
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.
Keyword Wind Turbine Drivetrain (풍력 드라이브트레인), Condition Monitoring (상태감시), Diagnosis (진단), prognosis (예지), bearing (베어링), state index (상태지수)
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