파랑 중 실린더형 구조물의 동적 안정성에 대한 연구
Study on Dynamic Stability of Cylindrical Structure in Waves
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A cylindrical structure has a very long period of heave and pitch motion response in ocean waves. To obtain the dynamic stability of a cylindrical structure, it is necessary to obtain the suitable metacentric height (GM). However, in a structure with sufficient metacentric height, Mathieu instability can occur if the natural frequency of the heave motion is double the natural frequency of the roll and pitch motion. This study carried out numerical calculations and experiments for vertical-axis wind turbines with cylindrical floaters, which had three different centers of gravity. In the regular wave experiment, the divergence of the structure motion without yaw was observed when the natural frequency of the heave motion was double the natural frequency of the roll and pitch motion. In the irregular wave experiment, the motion spectra of the structures with the different centers of gravity were compared, and one was very high when the natural frequency of the heave motion was double the natural frequency of the roll and pitch motion.
Abstract
A cylindrical structure has a very long period of heave and pitch motion response in ocean waves. To obtain the dynamic stability of a cylindrical structure, it is necessary to obtain the suitable metacentric height (GM). However, in a structure with sufficient metacentric height, Mathieu instability can occur if the natural frequency of the heave motion is double the natural frequency of the roll and pitch motion. This study carried out numerical calculations and experiments for vertical-axis wind turbines with cylindrical floaters, which had three different centers of gravity. In the regular wave experiment, the divergence of the structure motion without yaw was observed when the natural frequency of the heave motion was double the natural frequency of the roll and pitch motion. In the irregular wave experiment, the motion spectra of the structures with the different centers of gravity were compared, and one was very high when the natural frequency of the heave motion was double the natural frequency of the roll and pitch motion.
참고문헌 (6)
- Hong, Y. P., "An Experimental Study on the Extreme Motion Responses of a Spar Platform in the Heave Resonant Waves", The Fifteenth International Offshore and Polar Engineering Conference (2005), International Society of Offshore and Polar Engineers
- Koo, B. J., "Mathieu Instability of a Spar Platform with Mooring and Risers", Ocean Engineering, 31(7), pp.2175~2208 (2004)
- Oh, T. W., "An Experimental Study for the Dynamic Behaviour of Spar", M.S, pp.2003
- 박찬일, "Floquet 이론과 섭동법에 의한 Mathieu Equation의 안정성해석", 한국소음진동공학회논문집, 23(8), pp.734~741 (2013), 한국소음진동공학회[DOI]
- 노준범, "스파 플랫폼의Mathieu형 불안정성에 미치는 감쇠판의 영향", 대한조선학회 논문집, 42(2), pp.124~128 (2005), 대한조선학회
- Rho, J. B., "A Study on Mathieu-type Instability of Conventional Spar Platform in Regular Waves", International Journal of Offshore and Polar Engineering, 15(2), pp.104~108 (2005)