Time-domain Structural Analysis During Block Turnover and Lifting Using 2D Flexible Multibody Dynamics
Abstract Ship construction involves the assembly of several blocks on a dock. When a block is lifted using a crane, it undergoes deformation. Until now, structural analysis has been applied in a few cases to evaluate the stress on such blocks. Therefore, this study proposes an evaluation method for time-domain stress using 2D flexible multibody […]
Dynamic Flooding Analysis Method for Intermediate Flooding Process of a Ship
Abstract To guarantee the safety of a ship by preventing accidents, various regulations, including those related to the ship design, must be followed. Despite these efforts, accidents may occur. Personnel injury or oil spill are highly probable during an accident. Therefore, this study proposes a method for analyzing the intermediate state of flooding to predict […]
Block Erection Simulation Considering Frictional Contact with Wire Ropes
Abstract In shipyards, block erection operations are generally conducted by several cranes to transport and vertically rotate blocks. During such operations, potentially risky situations such as interferences between hoisted bodies and crane wire ropes, overloading, and collisions could arise, resulting in major damage. To mitigate the occurrence of these incidents, it is proposed that the […]
Design of a Wreck Removal Method Considering Safety and Economy
Abstract Selecting a proper lifting method for wreck removal is one of the most important procedures when planning a salvage operation. For this, both the safety and economy should be considered to prevent accidents and reduce time and cost. We propose an evaluation and verification method considering the safety and economy. A simulation based on […]
Performance Degradation of the Monoethylene Glycol Regeneration Process in the Presence of Electrolytes: Pilot-Scale Experiments and Dynamic Simulations
Abstract Safe production of natural gas from offshore gas fields would rely on the injection and regeneration of monoethylene glycol (MEG) to inhibit hydrate formation as well as corrosion and scale issues in subsea flowlines. In this study, we investigated the solubilities of NaCl and the vapor pressure of aqueous MEG solutions experimentally with a […]
CFD modelling of the influence of particle loading on erosion using dense discrete particle model
Abstract The present study aims at modelling erosion using Dense Discrete Particle Model (DDPM). The numerical model is based on Eulerian-Eulerian-Lagrangian approach which has been developed for modelling both dilute and dense particulate flows. In this approach, the continuous phase is modelled on a fixed Eulerian grid and particles are tracked by using Lagrangian model. […]
Integrated analysis of flow-induced noise from submarine under snorkel condition
Abstract Accurate evaluation of the underwater radiated noise under the snorkel operating condition is critical as submarines are frequently exposed to danger under this condition. In this article, the procedures of an integrated simulation to estimate the flow-induced noise considering the submarine operating condition are described. These procedures evaluate both the bubble noise from breaking […]
Prediction of Ocean Weather Based on Denoising AutoEncoder and Convolutional LSTM
Abstract The path planning of a ship requires much information, and one of the essential factors is predicting the ocean environment. Ocean weather can generally be gathered from forecasting information provided by weather centers. However, these data are difficult to obtain when satellite communication is unstable during voyages, or there are cases where forecast data […]
ISO 15016:2015-based Method for Estimating the Fuel Oil Consumption of a Ship
Abstract Recently, interest in the design and construction of smart ships has been widely increasing. Optimal route planning is a widely studied essential aspect of smart ship technology. Planning an optimal route requires an accurate estimation of the fuel oil consumption of a ship. Various studies have suggested methods for theoretically estimating the fuel oil […]
A study on effects of slug flow on dynamic response and fatigue damage of risers
Abstract A slug flow (a series of liquid slug separated by a gas pocket) is a flow pattern that often occurs in a multiphase oil and gas riser system. Dynamic and structural responses of a riser can be increased by time varying forces of the slug flow. In this paper, a methodology has been developed […]
