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Expected Life Evaluation of Offshore Wind Turbine Support Structure under Variable Ocean Environment

해양환경의 변동성을 고려한 해상풍력터빈 지지구조물의 기대수명 평가

  • Lee, Gee-Nam (Department of Ocean Science and Engineering, Kunsan National University) ;
  • Kim, Dong-Hyawn (School of Architecture and Coastal Construction Engineering, Kunsan National University) ;
  • Kim, Young-Jin (Department of Ocean Science and Engineering, Kunsan National University)
  • 이기남 (국립군산대학교 해양산업공학과) ;
  • 김동현 (국립군산대학교 건축해양건설융합공학부) ;
  • 김영진 (국립군산대학교 해양산업공학과)
  • Received : 2019.05.14
  • Accepted : 2019.10.22
  • Published : 2019.10.31

Abstract

Because offshore structures are affected by various environmental loads, the risk of damage is high. As a result of ever-changing ocean environmental loads, damage to offshore structures is expected to differ from year to year. However, in previous studies, it was assumed that a relatively short period of load acts repeatedly during the design life of a structure. In this study, the residual life of an offshore wind turbine support structure was evaluated in consideration of the timing uncertainty of the ocean environmental load. Sampling points for the wind velocity, wave height, and wave period were generated using a central composites design, and a transfer function was constructed from the numerical analysis results. A simulation was performed using the joint probability model of ocean environmental loads. The stress time history was calculated by entering the load samples generated by the simulation into the transfer function. The damage to the structure was calculated using the rain-flow counting method, Goodman equation, Miner's rule, and S-N curve. The results confirmed that the wind speed generated at a specific time could not represent the wind speed that could occur during the design life of the structure.

Keywords

Offshore wind turbine;Support structure;Uncertainty;Fatigue analysis;Expected life

Acknowledgement

Supported by : 한국연구재단, 한국에너지기술평가원(KETEP)