Journal of Wind Energy (풍력에너지저널)

Korea Wind Energy Association (한국풍력에너지학회)
권호 표지
DOI QR코드

DOI QR Code

Roll Motion Reduction of a Floating Wind Turbine Using Sloshing Liquid Damper

슬로싱 액체 댐퍼를 이용한 부유식 해상 풍력발전기 횡 운동 저감

  • 고창현 (제주대학교 풍력공학부) ;
  • 조일형 (제주대학교 해양시스템공학과)
  • Received : 2018.12.21
  • Accepted : 2018.12.27
  • Published : 2019.03.31
⟨ Previous Next ⟩

Abstract

A sloshing liquid damper (SLD), mounted rigidly to a structure, is used to damp the unwanted motion of various structures by allowing liquid to slosh in a tank. In the present study, an SLD was used to reduce the roll motion responses of a barge, one of the supporting structures of offshore wind turbines. To solve the problem of interactions between the barge and SLD tank, a WAMIT commercial numerical code based on potential theory was used. The numerical results were verified with experimental results, conducted in a two-dimensional wave tank. The numerical prediction agreed well with the experimental results except for the peak values at resonant frequency. If liquid is allowed to slosh in a tank, the response amplitude operator (RAO)'s curve of roll motion of the barge has double peaks at two different resonant periods, compared with one peak in the case of frozen liquid. The characteristics of the roll motion of the barge were investigated by changing the position, size, and filled liquid depth of the SLD tank. It was found that a properly deigned SLD can help to improve the efficiency of a floating offshore wind turbine, which is sensitive to the roll motion of the supporting structure.

Keywords

Acknowledgement

본 연구는 2018년도 산업통상자원부(MOTIE)의 재원으로 한국에너지기술평가원(KETEP)의 에너지인력양성사업 「육해상 풍력터빈 신뢰성 및 발전량 향상을 위한 O&M 기술 고급트랙」으로 지원받아 수행한 인력양성 성과입니다(No. 20184030202200).

References

  1. Chen, B. F., and Chiang, H W., 2000, "Complete Two Dimensional Analysis of Sea Wave Induced Fully Nonlinear Sloshing Fluid in a Rigid Floating Tank," Ocean Engineering, Vol. 27, pp. 953~977. https://doi.org/10.1016/S0029-8018(99)00036-0
  2. Rognebakke, O. R, and Faltisen, O. M., 2001, "Effects of Sloshing on Ship Motions," Proceeding of the 16th Workshop on Water Waves and Floating Bodies, Hiroshima, Japan.
  3. Molin, B., Remy, F., Rigaud, S., and de Joutte, Ch., 2002, "LNG-FPSO's: Frequency Domain Coupled Analysis of Support and Liquid Cargo Motion," Proceeding of the IMAM Conference, Rethymnon, Greece.
  4. Malenica, S., Zalar, M, and Chen, X B., 2003, "Dynamic Coupling of Sea Keeping and Sloshing. Proceeding of the 13th International Offshore and Polar Engineering Conference," Honoluu, USA, pp. 484~490
  5. Kim, Y., Shin, Y., Kim, W, aod Yue, D., 2003, "Study on Sloshing Problem Coupled with Ship Motion in Waves," Proceeding of the 8th International Conference on Numerical Ship Hydrodynamics, Busan, Korea, 9/22~25.
  6. Lee, D. H., Kim, M. H., Kwon, S. H, Kim, J. W., and Lee, Y. B., 2005, "A Parametric and Numerical Study on LNG-tank Sloshing Loads," Proceeding of the 15th International Offshore aod Polar engineering Conference, Seoul, Korea, 6/19~24.
  7. Newman, J. N., 2005, "Wave Effects on Vessels with Internal Tanks," Proceeding of the 20th Workshop on Water Waves and Floating Bodies, Spitsbergen, Norway.
  8. Lee, S. J., Kim, M. H., Lee, D. H. Kim, J. W., and Kim, Y. H., 2007, "The Effects of LNG-Tank Sloshing on The Global Motions of LNG Carries," Ocean engineering, Vol. 34, Issue 1, pp. 10~20. https://doi.org/10.1016/j.oceaneng.2006.02.007
  9. Nam, B. W., and Kim, Y., 2007, "Effect of Sloshing on The Motion Response of LNG-FPSO in Waves," Proceedings of the 22nd Workshop on Water Waves and Floating Bodies, Plitviz, Croatia.
  10. Cho, I. H., and Kim, M. H., 2016, "Effect of dual vertical porous baffles on sloshing reduction in a swaying rectangular tank," Ocean Engineering, Val. 126, pp. 364~373. https://doi.org/10.1016/j.oceaneng.2016.09.004
  11. Ibrahim, R. A., 2005, Liquid Sloshing Dynamics(Theory and Applications), Cambridge University Press.