Techno-economic analysis and Monte Carlo simulation of green hydrogen production technology through various water electrolysis technologies
Abstract The green hydrogen produced by water electrolysis combined with renewable energy is inevitable for a sustainable and clean energy society. However, the green hydrogen production cost is still more expensive than fossil fuel-based methods such as steam methane reforming and it is the biggest challenge. In this study, to determine the most economical way […]
Weapon compartment layout design method for improving the survivability of a naval ship by considering susceptibility distribution based on radar cross-section analysis
Abstract The survivability of a naval ship refers to its ability to withstand the damage caused by enemy attacks and to maintain their missions and functions. During naval warfare, if the armed space of a naval ship is exposed to the enemy, even a single shot can damage the combat system. Therefore, it is important […]
An experimental study of wave impact pressure on an FPSO bow under head sea conditions
Abstract This experiment was conducted in the ocean engineering basin (OEB) of the Korea Research Institute of Ships and Ocean engineering (KRISO) to investigate the characteristics of wave impact pressure on the floating production storage and offloading (FPSO) of bow. The experiment was conducted in 10-, 50-, 100-, and 1,000-year return period wave conditions. The wave impact pressure was […]
Statistical trajectory-distance metric for nautical route clustering analysis using cross-track distance
Abstract This study presents a novel statistical trajectory-distance metric specialized for nautical route clustering analysis. Based on the dynamic time warping (DTW) metric, one of the most used metrics for trajectory-distance, the statistical trajectory-distance metric was defined by replacing the distance term in DTW with a linear combination of the Jensen–Shannon divergence and Wasserstein distance. […]
Study on Nonlinear Heave and Pitch Motions of Conventional and Tumblehome Hulls in Head Seas
Abstract The broadside of the tumblehome hull is inclined inward, while that of the conventional hulls is inclined outward. As a result of the geometric shape, the tumblehome hull has distinct motion characteristics compared to the conventional hulls. In this study, the nonlinear heave and pitch motion responses of a tumblehome hull are investigated experimentally and […]
Towing Tank Model Tests for Propulsive Performance Analysis of a Waterjet-Propelled Amphibious Vehicle
Abstract The present study concerns a series of model tests in a towing tank on waterjet propulsive performance. The test model was an armored vehicle consisting of a box-shaped hull, two waterjets, a bow flap, and a trim tab. As per the powering prediction procedure of high-speed vessels, resistance tests, waterjet system tests, and self-propulsion […]
A comparison of numerical methods for damage index based residual ultimate limit state assessment of grounded ship hulls
Abstract Considerable efforts have been devoted to developing rapid methodologies for predicting the residual strength of ship hull girders for a given damage scenario (e.g., R–D diagram). This task is usually challenged by the difficulty of a proper definition of damaged scenarios, which is a function of the damage location and extent. The concept of damage index (DI) […]
Quasi-static Flooding Analysis Method of a Damaged Ship Considering Oil Spill and Cargo Load
Abstract When a ship is damaged at sea, it is important to predict its behavior as well as whether it is to sink or not. If the ship comes to an equilibrium, the equilibrium position and time should be estimated; otherwise, the time to sink should be estimated. Furthermore, flooding analysis should be carried out […]
Novel propane-free mixed refrigerant integrated with nitrogen expansion natural gas liquefaction process for offshore units
Abstract The presence of propane inventory in offshore liquefaction processes increases the concerns for platform safety. To address this, we propose a novel liquefaction process that integrates propane-free mixed refrigerant and nitrogen expander cycles (MR-N2). The proposed design adopts the advantages of both nitrogen expander and single mixed refrigerant (SMR) processes. The process was rigorously simulated using Aspen HYSYS, and the […]
Optimization of long-term planning with a constraint satisfaction problem algorithm with a machine learning
Abstract The object of the long-term planning in shipyards is to assign all the ordered vessels to the berths of the shipyard by minimizing the workload deviation along the time. However, there are limitations in establishing an optimized long-term plan because the optimization problem with the workload balancing takes too much time due to the […]
