Acoustic Transmission Loss of a Cylindrical Silencer Filled with Multilayer Poroelastic Materials Based on Mode-Matching Method

Abstract The efficacy of silencers in reducing piping noise is contingent upon the specific installation and operating environment. Among the various forms of silencers, the acoustic characteristics of dissipative silencers with sound-absorbing materials attached internally exist in an area that is difficult to explain by existing theories. This is dependent upon the specific type and […]

Hydrate management strategies for CO2 injection into depleted gas reservoirs

Abstract Sequestering CO2 in depleted gas reservoirs using carbon capture, utilization, and storage technologies has emerged as a viable strategy for mitigating global carbon emissions. However, CO2 hydrate formation during injection processes is challenging and poses a risk to the operational integrity and efficiency of sequestration projects. This study investigated CO2 hydrate formation dynamics within silica gel environments […]

Advancing the Hydrate-Based CO2 Separation Process by Implementing Spectroscopic Analysis and Process Simulation

Abstract The quest for environmentally sustainable solutions for CO2 recovery and purification has led to the development of innovative separation techniques, which are crucial for carbon capture, utilization, and storage (CCUS) applications. Moreover, refrigerant recovery techniques have been widely developed after the implementation of stringent global regulations on hydrofluorocarbon (HFC) emissions. This study explores the separation […]

A hybrid tracking method for maritime obstacles using sensor data

Abstract Safe navigation of ships depends on the accurate recognition and tracking of nearby maritime obstacles as detected by various sensors. Challenges arise in tracking maritime obstacles from sensor data because of sensor noise and incomplete sensor data. Traditionally, tracking algorithms such as the EKF (Extended Kalman Filter) have been applied to track the state […]

Ship route planning for collision avoidance based on the improved isochrone method

Abstract If ship navigators could access precise collision risk data and guidance for avoidance, safer navigation would be feasible. This study introduces a method for devising avoidance routes based on quantitative collision risk assessment. In particular, we propose an improved isochrone method, a cell-free approach akin to real ship navigation routes. The method uses a […]

Multi-vessel target tracking with camera fusion for unmanned surface vehicles

Abstract With the decreasing availability of sailors, there has been an increasing focus on the development of autonomous ships. Among the various components of autonomous ships, automatic recognition systems that can replace human vision are a crucial area of research. While ongoing studies utilize traditional perception sensors such as RADAR (RAdio Detection And Ranging) and […]

ANN-assisted prediction of wave run-up around a tension leg platform under irregular wave conditions

Abstract This study proposes a novel prediction method for nonlinear wave run-ups around a TLP by combining the linear diffraction method with deep learning techniques. Initially, the linear diffraction method evaluates relative wave motion around the platform based on measured incident waves and frequency domain analysis. Subsequently, an artificial neural network (ANN) predicts the peak values of nonlinear wave run-ups, utilizing incident wave data […]

Numerical PMM test in finite depth

Abstract This study conducted a numerical planar motion mechanism (PMM) test for a containership, considering the effects of finite depth. An OpenFOAM-based computational fluid dynamics (CFD) approach was employed to conduct the simulations. Before conducting a series of numerical computations, uncertainty analysis for the grid size and time step was performed to ensure the reliability […]