Jisang Ha, "Optimal Arrangement Method of Equipment and Pipes in the Engine Room of a Ship", Ph.D. Thesis, Seoul National University, 2023.08.29
Ph.D. Thesis
2023.10.23 10:49
Jisang Ha, "Optimal Arrangement Method of Equipment and Pipes in the Engine Room of a Ship", Ph.D. Thesis, Seoul National University, 2023.08.29
조회 수 73
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| Abstract | The arrangement design of a ship’s engine room must consider various factors, including interference from equipment and pipe located in the engine room, design rules, previous ship data, and expert knowledge. The arrangement design process for ships with many complex and customary areas relies on previous ship data and experts’ design experience or know-how. During the pipe routing design process, pipe routing relies on experts’ design experience and know-how. In order to complement the pipe routing of ships that rely on experts, this study propose a pipe routing optimization method by constructing an expert system that can systematize expert knowledge and combine it with optimization techniques. An Arrangement Template Model is constructed to represent the data structure, and an Arrangement Evaluation Model is used to evaluate the expert knowledge of real experts and computerize it systematically. The optimal arrangement results evaluated by the Arrangement Evaluation Model are used as the objective function of the optimization problem. For deriving an optimized design proposal by reviewing multiple designs in a short time, the optimization technique is combined with the expert system, and the optimization problem is formulated using it. This study proposes a two-stage optimization method to perform the optimal arrangement design for the engine room effectively. The 1st stage performs the optimal arrangement of the deck's height and the equipment's location and orientation. In the 1st stage, objective functions are set to minimize the volume occupied by the equipment arranged in the engine room, minimize the length and bends of pipes and ducts, maximize the space availability, and maximize the feasibility of expert knowledge. In particular, to consider the results of the pipe routing design in the 1st stage, the optimal arrangement method is proposed that can consider pipe routing results together during the equipment arrangement stage of the ship. In addition, to effectively utilize the expert's knowledge and experience in the arrangement design, an expert system is used to calculate the feasibility of the expert's knowledge. As constraints, the installation availability of the equipment and a subset of the expert knowledge are considered. Various global optimization methods were compared for the optimization algorithm, and the most suitable algorithm to perform the optimal arrangement was selected. The 2nd stage optimizes the routing of the pipes and ducts connecting the arranged equipment. In each step, the objective function is set to minimize the volume occupied by the equipment arranged in the engine room, minimize the length and bends of pipes and ducts, maximize the space availability, and maximize the feasibility of expert knowledge. As a route generation algorithm in the 2nd stage, various route generation algorithms were examined, and the Jump Point Search (JPS) algorithm was utilized to perform pipe routing in this study. To verify the effectiveness of the proposed method, the optimal layout of the engine room of a 320,000-ton deadweight very large crude carrier (VLCC) was performed. The results showed that the proposed method could derive the optimal arrangement for the decks, equipment, and pipes inside the ship’s engine room. In future work, to improve the limitations of this study, which considers only major equipment, additional arrangement designs for equipment other than the major equipment will be considered. In the pipe routing process, various optimization methods and route generation methods will be evaluated to improve the calculation time. In addition, pipe routing methods that consider various bending angles will be studied, and additional expert knowledge that considers the characteristics of each pipe (flow rate, branch pipes, etc.) will be further developed. Keywords: Engine room arrangement, optimal arrangement, pipe routing, expert system, optimization technique, pathfinding algorithm |
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| Publication Date | 2023-08-29 |
