Dynamic Model of a Offshore Wind Turbine with a Supporting Structure with Suction Buckets for Prediction of Natural Frequencies

석션 버켓 지지구조를 포함하는 해상 풍력발전기 고유진동수 추정을 위한 모형화

  • 서윤호 (한국기계연구원, 기계시스템안전연구본부) ;
  • 김상렬 (한국기계연구원, 기계시스템안전연구본부) ;
  • 김봉기 (한국기계연구원, 기계시스템안전연구본부)
  • Received : 2016.10.17
  • Accepted : 2016.12.05
  • Published : 2016.12.31

Abstract

Impulse noise from hitting the piles and high cost due to construction time prevent offshore wind turbines from advancing over the world. Recently, a supporting structure with suction buckets, which is superior to piles and jackets in terms of low noise and cost, is being constructed and can then make the industries of offshore wind turbines to be more competitive. As for using the supporting structure with suction buckets, it is important to predict the natural frequencies of the whole structure. In this paper, the effective methods for modelling the various components of the whole structure are suggested in order to predict accurate natural frequencies. Spring elements are used for soil and connecting parts of suction buckets. Then, a blade is modelled by a 2-DOF equivalent model which has the same natural frequencies of the single blade. The proposed method is demonstrated by comparing predicted natural frequencies to experiment results.

Keywords

Acknowledgement

본 연구는 2014년도 산업통상자원부의 재원으로 한국에너지기술평가원(No. 20143010024330, 실규모 해상 풍력 터빈을 탑재한 석션버켓 지지구조 실증연구) 및 한국기계연구원 기관고유사업(NK198B, 풍력발전시스템의 고장진단 및 예지보전 기술 개발)의 지원을 받아 수행한 연구 과제입니다.