Study on Hydroelastic Responses of Membrane-Type LNG Cargo Containment Structure under Impulsive Sloshing Loads of Different Media
Abstract Owing to the increasing g lobal demand for natural gas, the construction of liquefied natural gas (LNG) carriers has become a key trend in the shipbuilding market. In the design of membrane-type LNG carriers, a sloshing analysis is crucial for cargo containment systems (CCSs). In this study, structural responses due to impulsive sloshing loads […]
A method for the profile optimization of the primary barrier of a membrane-type LNG tank using surrogate modeling
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 […]
Digital twin model of in-line inspection systems for low-pressure, low-flow natural gas pipelines
Abstract In-line inspection (ILI) of natural gas pipelines is currently performed by an intelligent pipeline inspection gauge (PIG) using the differential pressure of the fluid in pipelines. The ILI robotic system is driven by the pressure difference between the front and rear parts of the robot, and the sensor system collects data about pipeline integrity. […]
Comprehensive analysis of polysulfone membrane humidifier in hydrogen fuel cell vehicles: Experimental and theoretical approaches
Abstract This study performed a comprehensive experimental and theoretical analysis of a shell-and-tube type gas-to-gas humidifier module in a 95 kW class hydrogen fuel cell vehicle. The humidifier module features a polysulfone hollow fiber membrane characterized by its hydrophilic and non-fluorinated properties. Experimental investigations were conducted to understand the impacts of the inlet temperature, relative humidity, […]
Development of optimal energy management strategy for proton exchange membrane fuel cell-battery hybrid system for drone propulsion
Abstract Drones powered by fuel cells have been developed to ensure long flight distances. Due to the low dynamic responsiveness of proton exchange membrane fuel cell (PEMFC) systems, they must be integrated with batteries to fully meet the power demand profiles of drones. In this study, a dynamic model of a PEMFC-battery hybrid system for […]
Advanced techniques for residual stress measurement and data processing in fatigue crack growth rate tests of FH36 and 9% Ni steel at cryogenic temperatures
Abstract Safety assessment of cryogenic temperature liquefied gas storage tanks is one of the crucial technologies for reducing CO2 emissions. Residual stresses (RS) in welded structures can significantly impact their structural integrity. Measuring RS in cryogenic environments and studying the impact on crack propagation is essential for safety assessments. Studies have proposed methods for measuring […]
Early Detection and Prevention of Two-Phase Flow-Induced Vibrations in CO2 Transport Pipelines Using a Flow Control System Coupled with a Neural Network Model
Abstract This study addresses the challenge of two-phase flow-induced vibrations (FIVs) in CO2 transport pipelines, which are crucial for safe operation of the pipelines and processing facilities for carbon capture and storage (CCS) projects. The formation of two-phase flow due to phase changes may induce vibrations of pipelines, especially in riser sections of offshore platforms. Conventional […]
In-situ analysis of water transport properties through a reinforced composite membrane in polymer electrolyte membrane fuel cells
Abstract This study presents a comprehensive in-situ analysis of water transport properties through an expanded polytetrafluoroethylene (ePTFE)-reinforced composite membrane, representing a notable advancement over previous studies that primarily focused on Nafion membranes. The membrane water content was measured using dynamic vapor sorption (DVS) isotherms, and the temperature dependence of sorption was investigated using a new […]
Numerical study for slamming loads on the bow of a ship-type FPSO model under breaking waves
Abstract Numerical analyses were performed to investigate the characteristics of the slamming impact loads on the bow-flare of a ship-type floating production storage and offloading (FPSO) model under breaking waves. To estimate the slamming impact load, a series of breaking wave simulations was performed. From 2D wave flume tests, the grid aspect ratio, convection scheme, turbulence model, effect of surface […]
Experimental study of characteristics of sidewall green water event for a ship-type FPSO under irregular wave conditions
Abstract This study conducted an experimental investigation into the characteristics of the sidewall green water problem of a ship-type floating production storage and offloading (FPSO) under irregular waves. The study applied three different irregular waves and two different heading angles. Relative wave elevations were measured using 12 wave probes on the deck and side of the FPSO […]
