Impacts of carbon corrosion, freeze/thaw, and acidic solution immersion accelerated stress tests on the durability degradation of the membrane electrode assembly
Abstract The proton exchange membrane fuel cell (PEMFC) consists of key components, including the membrane electrode assembly (MEA), gas diffusion layer (GDL), and flow channels. The MEA, which plays a central role in electrochemical reactions, comprises a proton-conducting membrane and a catalyst layer (CL) made of ionomer and platinum/carbon (Pt/C). While extensive research has focused […]
Exergy analysis for solid oxide fuel cell integrated hybrid desiccant cooling system
Abstract A numerical study on the residential solid oxide fuel cell (SOFC)-hybrid desiccant cooling (HDC) system has been proposed in our previous study. It has been established that only energy analysis cannot determine the optimal operating scenario. Since the SOFC operates at high temperatures, exergy analysis should be conducted to establish optimal system design by […]
Modeling and simulation of thermodynamic behavior of an LNG fuel tank by using artificial neural network based on operational data
Abstract As marine environmental regulations have been strengthened, the use of LNG (Liquefied Natural Gas) as a marine fuel is increasing. In an LNG tank under cryogenic condition, boil-off gas is generated due to heat ingress, and the pressure and temperature of the tank continuously change. For safe and efficient operation of LNG fueled ships, […]
Simulation-based deep reinforcement learning for multi-objective identical parallel machine scheduling problem
Abstract In the shipbuilding industry, traditional optimization studies based on linear programming and constraint programming have been conducted to solve mid-term or long-term scheduling problems. However, due to the extensive computational time, these methods face limitations in addressing short-term scheduling problems for the unit production systems of shipbuilding processes, where various environmental uncertainties must be […]
Review of ship arrangement design using optimization methods
Abstract This study presents a comprehensive review of various research efforts aimed at optimizing ship arrangement design. A detailed comparative analysis was conducted on studies that approached ship arrangement design from an optimization perspective. Therefore, the fundamental components of an optimization problem (design variables, objective functions, and constraints) were systematically summarized. Ship arrangement design problems […]
An Updated Design Formula for Predicting the Compressive Strength of Plate: Elastic Buckling and Ultimate Compressive Strength
Abstract In the present study, a simplified and useful design formula is proposed to predict the ultimate strength of a plate under longitudinal compression. The shape of the elastic buckling strength (𝜎𝑥𝐸) equation is utilised and adjusted to predict the ultimate compressive strength of the plate. In total, 600 cases of reasonable plate scenarios are […]
Condition assessment of primary barriers in LNG cargo containment systems under multifaceted loadings: tension, compression, shear and pressure
ABSTRACT This study investigates the structural integrity of the GTT Mark III membrane-type Liquefied Natural Gas Cargo Containment System (LNG CCS), focusing on the 1.2 mm SUS304L stainless steel primary barrier. Using an advanced material model for finite element analysis, the research evaluates the barrier’s response to critical loads, including tension, compression, shear, and internal […]
Development of Application Customization Toolkit (ACT) for 3D Thermal Elastic-Plastic Welding Analysis
Abstract A 3D thermal elastic-plastic welding analysis ACT (Application Customization Toolkit) was developed in ANSYS, making welding analysis more accessible. The welding analysis was performed using a decoupled method, separated into thermal and structural analyses. To validate the results, comparisons were made with previous studies for two types of welding: T-joint fillet welding and butt […]
HOBEM Computations for Wave-Induced Motion Responses and Connector Loads of a Modular Floating Island
Abstract Modular floating islands are a promising option for ocean space utilization, offering affordability and sustainability. In this study, the motion response and connector load of a modular floating island in waves were numerically investigated based on potential flow theory. Numerical analysis was performed by adopting a Higher-order Boundary Element Method with the wave Green […]
Experimental observation on violent sloshing flows inside rectangular tank with flexible baffles
Abstract In this study, a series of sloshing model tests were conducted to observe the effects of an internal baffle in a rectangular tank and to secure basic data for future numerical calculations or applications to similar phenomena. The sloshing flows and flexible motions of two different baffles with hyper-elastic properties were observed and the […]
