Dong-Woo Kim, Myung-Il Roh, Minkyu Park, Mun-gwan Choi, Seongbo Park, Yong-Tai Kim, Hoonkyu Oh, Byungki Choi, "A Method for
Improving Sloshing Assessment in Membrane-Type Cargo Tanks Considering
Strucutral Nonlinearity", Proceedings of OMAE(International Conference on Ocean, Offshore and Arctic Engineering) 2025, Vancouver, Canada, 2025.06.22-27
International Conference
2025.07.10 11:41
Dong-Woo Kim, Myung-Il Roh et al., "A Method for Improving Sloshing Assessment in Membrane-Type Cargo Tanks Considering Strucutral Nonlinearity", Proceedings of OMAE 2025, Vancouver, Canada, 2025.06.22-27
조회 수 1073
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| Abstract | The sloshing phenomenon during LNG carrier operations poses significant challenges to the structural safety of cargo containment systems (CCS), as high-amplitude sloshing loads can lead to permanent damage. Traditional linear-based sloshing assessment methods, while conservative, tend to produce overly safe results that fail to capture the nonlinear behavior of actual sloshing loads. Although several Classification Societies have introduced methodologies incorporating structural nonlinearity, further refinements are required for practical engineering applications. This study proposes an enhanced sloshing assessment method that integrates structural nonlinearity, building on existing approaches from Classification Societies, and applies it to the MARK III Flex CCS of a 174,000 CBM Class LNG carrier (LNGC). The methodology accounts for material nonlinearity by considering strain rate effects and the plastic deformation of rigid polyurethane foam (R-PUF). Representative installation locations, including the center case and intersection case, were analyzed to investigate the influence of hull structures on sloshing responses. Sloshing loads were determined using a short-term approach, with experimental model testing conducted to estimate peak pressure and rise time ranges under operational conditions for the 174,000 CBM LNGC. The analysis revealed the static and dynamic response characteristics of the MARK III Flex CCS, leading to the derivation and empirical formula of material-specific dynamic amplification factor (DAF) spectrum. A new evaluation formula incorporating dynamic characteristics was also proposed and validated. This study underscores the previously overlooked impact of installation locations on the MARK III Flex system and enhances the evaluation curves suggested by Classification Societies. The proposed methodology provides a practical and advanced approach for sloshing assessment in membrane-type LNGCs equipped with MARK III Flex CCS. |
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| Publication Date | 2025-06-23 |
