Empirical formulations for prediction of permanent set evolution of steel plates due to repeated impulsive pressure loadings induced by slamming
Abstract While in service, marine structures can be damaged due to repeated impact pressures induced by slamming. This paper presents empirical formulations for prediction of permanent set evolution of steel plates used in marine applications under repeated impulsive pressure arising from slamming. The applied numerical computation methodology was developed using the nonlinear finite element commercial […]
Fatigue damage prediction of top tensioned riser subjected to vortex-induced vibrations using artificial neural networks
Abstract The ongoing reduction in extent and thickness of sea ice in the Arctic might result in an increase of oil spill risk due to the expansion of shipping activity and oil exploration shift towards higher latitudes. This work assessed the response of two oil-in-ice surface drift models implemented in an open-source Lagrangian framework. By considering […]
Operational optimization of a hybrid desiccant cooling system for building air conditioning system
Abstract Hybrid desiccant cooling system has a higher electric coefficient of performance than that of electric heat pump system because evaporative cooler highly contributes to diminishing the cooling load. An abundant waste heat must be secured because of a thermal requirement for regenerating a desiccant rotor. However, the cooling capability of the evaporative cooler is […]
Prediction of sloshing pressure and structural response of LNG CCS
Abstract Sloshing pressure that has a short rising time and a large peak value can cause structural damage to the primary membrane or insulation panel of the LNG cargo containment system (LNG CCS). Several experimental and numerical approaches have been suggested to estimate the design sloshing pressures used in the LNG CCS design stage. In […]
Numerical investigation on hopf bifurcation problem for nonlinear dynamics of a towed vessel in calm water and waves
Abstract In this study, the Hopf bifurcation problem with regard to the nonlinear dynamics of a towed vessel was numerically investigated. A time-domain simulation method based on three degrees-of-freedom maneuvering equations of motion was applied to study the nonlinear dynamic responses of a towed vessel in calm water, wind and waves. In the towing operation, […]
Real-time Digital Twin for Ship Operation in Waves
Abstract This paper introduces a real-time digital twin for ship operations in seaways. The concept of the digital twin is becoming popular, and it is adopted for ship operation systems in this study. In particular, this paper introduces a new and innovative concept of the digital twin to predict ocean waves and hydrodynamic performances, such […]
Time series prediction of hydrate dynamics on flow assurance using PCA and Recurrent neural networks with iterative transfer learning
Abstract Preventing gas hydrate formation is critical in offshore gas and oil production systems. Several models can predict hydrate formation, however, these empirical approaches have limitations due to dependency on geometries and fluid characteristics of the systems. The trends of hydrate formation or risk are considered statistical, which means there is no definite model […]
Fast and Versatile Feature-Based LiDAR Odometry via Efficient Local Quadratic Surface Approximation
Abstract We present a fast and versatile feature-based LiDAR odometry method using local quadratic surface approximation and point-to-surface alignment. Unlike most feature-based methods, our approach approximates the local geometry of the LiDAR scan as a quadratic surface to mitigate performance degradation caused by the inconsistency between the feature class and the map's local geometry. For […]
Turbulence structure under the free-surface wave around an advancing surface-piercing cylinderical body
Abstract Free-surface wave effects on the turbulent boundary layer and wake of a surface-piercing slender body are investigated by measuring the flow and free-surface elevation around the model in three different Froude number (Fr) conditions—0.126, 0.282, and 0.400. The flow is measured by a towed underwater stereoscopic particle image velocimetry system. At the lowest Fr of 0.126, […]
Sloshing Phenomenon Occurring in the Foremost Two Tanks of LNG Carrier
Abstract Herein, to predict the sloshing pressure for the No. 1 and No. 2 tanks of a liquefied natural gas carrier, a series of sloshing model tests were performed and the obtained results were analyzed. By statistically approaching the experimentally measured pressure, the differences by position in each tank were analyzed. At this time, the […]
