석션 버켓 지지구조를 포함하는 해상 풍력발전기 고유진동수 추정을 위한 모형화
Dynamic Model of a Offshore Wind Turbine with a Supporting Structure with Suction Buckets for Prediction of Natural Frequencies
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초록
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.
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.
참고문헌 (8)
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- Bisoi, S., "Dynamic Analysis of Offshore Wind Turbine in Clay Considering Soil–Monopile–Tower Interaction", Soil Dynamics and Earthquake Engineering, 63, pp.19~35 (2014)
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- Andersen, L., "Natural Frequencies of Wind Turbines on Monopile Foundations in Clayey soils—A Probabilistic Approach", Computers and Geotechnics, 43, pp.1~11 (2012)
- Liingaard, M., "Impedance of Flexible Suction Caissons", Earthquake Engineering and Structural Dynamics, 36, pp.2249~2271 (2007)
- Wolf, J., "Foundation Vibration Analysis: A Strength-of-Materials Approach" (2004), Elsevier
- 유정수, "해상풍력터빈의 고유진동수 예측을 위한 지반에 인입된 파일의 탄성지지보 모델 기반 수평 거동 해석", 한국음향학회지, 35(4), pp.261~271 (2016), 한국음향학회[DOI]
- 서윤호, "보를 이용한 지지 구조 고유 진동수 해석을 위한 연결부 모델링 방법", 2015년 풍력에너지학회 춘계학술대회 (2015)