선체구조의 탄성지지 효과를 고려한 LNG 운반선 방열구조의 슬로싱 충격응답 해석법에 관한 연구
Sloshing Impact Response Analysis for Insulation System of LNG CCS Considering Elastic Support Effects of Hull Structures
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초록
The sloshing pressure acting on a membrane-type LNG CCS is a typical irregular impact load, and the structural response of a tank system induced by sloshing also shows very complex behavior, including fluid structure interaction. Therefore, it is not easy to accurately estimate the sloshing impact pressures and resulting structural response. Moreover, a huge time consuming process to deal with the enormous pressure data obtained during a model tank test and the following structural analysis would be inevitable. To reduce the computation time for structural analysis, in this study, a rational structural modeling strategy was considered, and a simplified scheme to analyze the dynamic structural responses of an LNG CCS was introduced, which was based on the concept of the linear combination of the triangular response functions obtained by a transient response analysis of structures under unit triangular impact pressure. A structural analysis of a real Mark III membrane type insulation system under the sloshing impact pressure time histories obtained by model tests was performed using the various proposed structural models and simplified analysis scheme. The results were investigated in detail, including the elastic support effects of the hull structure.
Abstract
The sloshing pressure acting on a membrane-type LNG CCS is a typical irregular impact load, and the structural response of a tank system induced by sloshing also shows very complex behavior, including fluid structure interaction. Therefore, it is not easy to accurately estimate the sloshing impact pressures and resulting structural response. Moreover, a huge time consuming process to deal with the enormous pressure data obtained during a model tank test and the following structural analysis would be inevitable. To reduce the computation time for structural analysis, in this study, a rational structural modeling strategy was considered, and a simplified scheme to analyze the dynamic structural responses of an LNG CCS was introduced, which was based on the concept of the linear combination of the triangular response functions obtained by a transient response analysis of structures under unit triangular impact pressure. A structural analysis of a real Mark III membrane type insulation system under the sloshing impact pressure time histories obtained by model tests was performed using the various proposed structural models and simplified analysis scheme. The results were investigated in detail, including the elastic support effects of the hull structure.
참고문헌 (10)
- American Bureau of Shippng, "Guidance Note on Strength Assesment of Membrane-Type LNG Containment Systems under Sloshing Loads", ~ (2006)
- Graczyk, M., "A Probabilistic Assessment of Design Sloshing Pressure Time Histories in LNG Tanks", Ocean Engineering, 35, pp.834~855 (2008)
- "MARK III System's Original Design" (2017)[URL]
- Ki, M.-S, "A study on Sloshing Impact Response Analysis of LNG CCS", M.S, pp.2011
- 남종오, "강제입수에 의한 슬래밍 현상에 관한 실험적 연구", 한국해양공학회지, 21(1), pp.40~44 (2007), 한국해양공학회
- 노인식, "유체 충격압력 시계열의 모델링에 관한 기초 연구", 대한조선학회 논문집, 47(2), pp.242~247 (2010), 대한조선학회
- 노인식, "LNG 화물창 단열구조의 슬로싱 충격응답 간이해석법에 관한 연구", 대한조선학회 논문집, 48(5), pp.451~456 (2011), 대한조선학회
- Nho, I.S, "A Study on the Sloshing Impact Response Analysis for the Insulation System of Membrane Type LNG Cargo Containment System", Proceeding of 2011 Computational Structural Engineering Annual Conference (2011)
- Nho, I.S, "Sloshing Impact Response Analysis for Insulation System of Mark III type LNG Cargo Containment System", Proceedings of the 26th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structure (2012)
- 염덕준, "2차원 쐐기형 구조물의 슬래밍 현상에 대한 수치 유동해석", 대한조선학회 논문집, 45(5), pp.477~486 (2008), 대한조선학회