중앙 단면 형상에 따른 횡동요 감쇠 추정 실험 연구
Experimental Study on Estimation of Roll Damping for Various Midship Sections
2
조회
0
다운로드
4
인용
0
참고문헌
키워드
초록
The magnitude of the roll motion of a floating structure depends on the roll damping acting on the body. In other words, the roll damping of a floating structure must be accurately obtained in order to precisely evaluate the roll motion. Various methods are used to evaluate the roll damping of a floating structure, such as the linear potential theory, computational fluid dynamics (CFD), and model tests. However, it is difficult to evaluate the roll motion of a floating structure with appendages such as a bilge keel and riser slot due to the limitation of ignoring the viscous effects in the linear potential theory. Among these methods, a model test based on a free decay test and harmonic excited roll motion (HERM) is known to be the most reliable method to estimate the roll damping of the floating structures. In this study, model tests using free decay and HERM techniques were performed in the Ocean Engineering Basin (OEB) of KRISO with various types of midship sections. The roll damping results were estimated based on post-processing methods using both techniques, and the roll damping results were compared.
Abstract
The magnitude of the roll motion of a floating structure depends on the roll damping acting on the body. In other words, the roll damping of a floating structure must be accurately obtained in order to precisely evaluate the roll motion. Various methods are used to evaluate the roll damping of a floating structure, such as the linear potential theory, computational fluid dynamics (CFD), and model tests. However, it is difficult to evaluate the roll motion of a floating structure with appendages such as a bilge keel and riser slot due to the limitation of ignoring the viscous effects in the linear potential theory. Among these methods, a model test based on a free decay test and harmonic excited roll motion (HERM) is known to be the most reliable method to estimate the roll damping of the floating structures. In this study, model tests using free decay and HERM techniques were performed in the Ocean Engineering Basin (OEB) of KRISO with various types of midship sections. The roll damping results were estimated based on post-processing methods using both techniques, and the roll damping results were compared.
참고문헌 (8)
- Blume, P., "Experimentelle Bestimmung von Koeffizienten der Wirksamen Rolldämpfung und Ihrer Anwendung zur Abschätzung Extremer Rollwinkel", Ship Technology Research, Schiffstechnik, 26, pp.3~23 (1979)
- Himeno, Y., "Prediction of Ship Roll Damping - State of the Art", pp.1981
- Ikeda, Y., "On Roll Damping Force of Ship : Effects of Friction of Hull and Normal Force of Bilge Keels", Journal of the Kansai Society of Naval Architects, Japan, 161, pp.41~49 (1976)
- A Prediction Method for Ship Roll Damping, "Ikeda, Y.", Department of Naval Architecture, University of Osaka Prefecture, ~, pp.Department of Naval Architecture, University of Osaka Prefecture, 00405 (1978)
- Oliva-Remola, A., "Estimation of Damping through Internally Excited Roll Tests", Ocean Engineering, 160, pp.490~506 (2018)
- Park, B., "Study on Estimation Methods of Roll Damping Coefficients for 30k LNG-BS Using Designed Excitation Device for Harmonic Roll Motion", Proceedings of Fall Conference of the Korean Society of Ocean Engineers, pp.86~90 (2017)
- Park, B., "Study on the Estimation Methods of Roll Damping Coefficients Using Designed Excitation Device for Harmonic Roll Motion", Proceedings of ISOPE 2018 (2018)
- Handschel, S., "Estimation of Ship Roll Damping - a Comparison of the Decay and the Harmonic Excited Roll Motion Technique for a Post Panamax Container Ship", Proceedings of the 12th International Conference on the Stability of Ships and Ocean Vehicles, pp.475~488 (2015)