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| Abstract | Membrane-type cargo holds, known for their high capacity, are commonly used in LNG carriers and are composed of various insulating materials and primary and secondary barriers to provide good thermal insulation and structural strength. The primary barrier, directly in contact with the liquefied cargo, is designed with a corrugated profile to withstand cryogenic thermal loads, cargo pressure, and sloshing loads. In this study, a novel method for developing the optimal profile of the primary barrier in a membrane-type LNG tank is proposed. The profile is defined using a third-order Bezier curve to allow flexibility in design, and tensile tests for SUS304L, cargo pressure calculations based on IGC code, and sloshing loads derived from model tests are used for non-linear structural analysis. Global optimization of the primary barrier profile is performed using the genetic algorithm NSGA-II, applying surrogate models as objective functions. Various surrogate models, including traditional methods and DNN, are evaluated to identify the most suitable model for optimization. The proposed method was compared and analyzed with the primary barrier geometry of the MARKIII FLEX cargo containment system (CCS) of a 174K LNG carrier. The results show that the optimal primary barrier can minimize longitudinal stress, permanent deformation, and production costs. |
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| Publication Date | 2025-02-01 |
| Role | Corresponding Author |
| Category | SCI |
Dong-Woo Kim, Myung-Il Roh, Do-Hyun Chun, Sun-Hong Woo, Yong-Tai Kim, “A Method for the Profile Optimization of the Primary Barrier of a Membrane-type LNG Tank Using Surrogate Modeling”, Ocean Engineering, Vol. 317, 2025.02.01
https://doi.org/10.1016/j.oceaneng.2024.120054
Ki-Su Kim, Myung-Il Roh, “Review of Ship Arrangement Design Using Optimization Methods”, Journal of Computational Design and Engineering, Vol. 12, No. 1, pp. 100-121, 2025.01.31
Dong-Woo Kim, Myung-Il Roh, Do-Hyun Chun, Sun-Hong Woo, Yong-Tai Kim, “A Method for the Profile Optimization of the Primary Barrier of a Membrane-type LNG Tank Using Surrogate Modeling”, Ocean Engineering, Vol. 317, 2025.02.01
Dong-Guen Jeong, Myung-Il Roh, In-Chang Yeo, Ki-Su Kim, Jun-Sik Lee, “A Route Planning Method for Small Ships in Coastal Areas Based on Quadtree”, IJNAOE, Vol. 17, pp. 100647.1-17, 2025.02.03
Jin-Hyeok Kim, Myung-Il Roh, In-Chang Yeo, “A Method for Generating Multiple Hull Forms at Once Using MLP (Multi-Layer Perceptron)”, Ocean Engineering, Vol. 324, pp. 120659.1-20, 2025.04.30
In-Su Han, Myung-Il Roh, Min-Chul Kong, Seoyoon Park, Jeongyoul Lee, "Search Method for Ship Regulations Based on Semantic Similarity Using Natural Language Processing", Ships and Offshore Structures, 2025.05.12
Min-Chul Kong, Myung-Il Roh, In-Su Han, ..., "A Representation Method of Pipe Connections and Routing Space in Pipe Auto-routing Using Graph and Octree Structures", Ocean Engineering, Vol. 329, 121204, pp. 1-18, 2025.06.15
Yun-Sik Kim, Myung-Il Roh, Ha-Yun Kim, In-Chang Yeo, "An Improved Method of Detecting the Horizon for Tracking Maritime Obstacles", Ocean Systems Engineering, Vol. 15, No. 2, pp. 219-239, 2025.06.30
In-Chang Yeo, Myung-Il Roh, Dong-Guen Jeong, Jun-Sik Lee, "A Route Planning Method for Small Ships Inside the Marina", International Journal of Naval Architecture and Ocean Engineering, Vol. 17, pp. 100684.1-16, 2025.08.13
In-Su Han, Myung-Il Roh, Min-Chul Kong, “An Automated Method for Converting P&IDs in Shipbuilding to Structured Graphs”, International Journal of Naval Architecture and Ocean Engineering, Vol. 17, pp. 100696.1-20, 2025.10.04
In-Chang Yeo, Myung-Il Roh, Yun-Sik Kim, Ha-Yun Kim, Do-Hyeok Ahn, Nam-Sun Son, "A Localization Method of Nearby Ships Based on 3D Object Detection Using a Camera", International Journal of Naval Architecture and Ocean Engineering, 2025.11.12
Jin-Hyeok Kim, Myung-Il Roh, In-Chang Yeo, “An MLP (Multi-Layer Perceptron)-Based Method for Optimizing Multiple Hull Forms at Once Using Surrogate Modeling with Geometric Moments”, Ocean Engineering, Vol. 339, Part 1, 2025.11.15
In-Su Han, Myung-Il Roh, Min-Chul Kong, "A RAG-based Q&A System for Ship Regulations Applying Domain Adaptation", International Journal of Naval Architecture and Ocean Engineering, Vol. 18, pp. 100735.1-18, 2025.12.23
Dong-Woo Kim, Myung-Il Roh, Yong-Tai Kim, Minkyu Park, Mun-gwan Choi, Jin-Hyeok Kim, "A Nonlinear Methodology for the Sloshing Assessment in the Membrane-type LNG Cargo Containment System", accepted for publication in Ocean Engineering, 2025.12.29
Hyun Soo Kim, Myung-Il Roh, "Data-driven Model for Predicting Tank Pressure of an LNG Carrier Considering Environmental Effects", International Journal of Naval Architecture and Ocean Engineering, Vo.l. 18, 2026.01.01
Seong-Won Choi, Myung-Il Roh, In-Chang Yeo, Won-Chul Yoo, Seon-Do Han, "A Route Planning Method for Small Ships Based on Historical AIS Data", Ocean Engineering, Vol. 343, Part 3, 123372, 2026.01.15
