Ray-based blind deconvolution with maximum kurtosis phase correction

Abstract Ray-based blind deconvolution (RBD) is a method that estimates the source waveform and channel impulse response (CIR) using the ray arrival in an underwater environment. The RBD estimates the phase of the source waveform by using beamforming. However, low sampling, array shape deformation, and other factors can cause phase errors in the beamforming results. […]

Is electric battery propulsion for ships truly the lifecycle energy solution for marine environmental protection as a whole?

Abstract This paper was inspired to answer the fundamental question on whether electric battery powered ships can ultimately be a promising solution for future maritime environmental protection. The overall process was designed to demystify the holistic environmental benefits and harms of 14 primary energy sources for electricity production in consideration of the national-specific cases of 33 countries. […]

Life cycle cost analysis of CO2 compression processes coupled with a cryogenic distillation unit for purifying high-CO2 natural gas

Abstract Novel compression processes coupled with a cryogenic distillation unit are designed in this study to purify high-CO2 natural gas or biogas before injection into the reservoir. Four different designs are evaluated to achieve the required injection pressure and minimize both the capital and operation costs. Depending on the pressure–temperature pathway for the compression of the top and bottom products of the distillation unit, […]

Wave data prediction with optimized machine learning and deep learning techniques

Abstract Maritime Autonomous Surface Ships are in the development stage and they play an important role in the upcoming future. Present generation ships are semi-autonomous and controlled by the ship crew. The performance of the ship is predicted using the data collected from the ship with the help of machine learning and deep learning methods. […]

Uncertainty assessment of outdoor free-running model tests for maneuverability analysis of a damaged surface combatant

Abstract The present study concerns test uncertainty analysis of outdoor free-running model tests for assessing the maneuverability. The Office of Naval Research Tumblehome surface combatant model with a damaged compartment on the bow was used for outdoor free-running model tests. The random and systematic standard uncertainty was assessed from repeated maneuvering tests and comparison with indoor free-running model […]

Prediction model of LNG weathering using net mass and heat transfer

Abstract In an liquefied natural gas (LNG) storage tank, the composition of LNG changes with time owing to the boil-off gas (BOG) generation, and it is a crucial characteristic in designing a BOG management system. Until recently, the vapor phase temperature and the heat exchange at the interface have been utilized to predict the non-equilibrium thermodynamic behavior […]

An empirical formula to assess ultimate strength of initially deflected plate: Part 2 = combined longitudinal compression and lateral pressure

Abstract This study proposes an empirical formula to predict the ultimate strength of the initially deflected plate subjected to combined longitudinal compression and lateral pressure. The reliable plate scenarios selected are analysed by the ALPS/ULSAP (= Analysis of Large Plated Structures/Ultimate Limit State Assessment Program) method. In total, 5,600 plate scenarios, including the effects of geometry, […]

An empirical formula to assess ultimate strength of initially deflected plate: Part 1=propose the general shape and application to longitudinal compression

Abstract This study proposes a simplified empirical formulation to predict the ultimate strength of the initially deflected plate subjected to longitudinal compression. The empirical formulation's applicability and accuracy were verified by comparing the nonlinear finite element method (NLFEM). In total, 700 cases of initially deflected plate scenarios by assuming the buckling mode shape were adopted as the input data. For […]

Numerical investigation on hydrodynamic energy conversion performance of breakwater-integrated oscillating water column-wave energy converters

Abstract Various wave energy converters (WECs) have been developed to utilize ocean wave energy resources. Among them, an oscillating water column (OWC) device is a promising wave energy converter that has undergone several pilot tests in the ocean with various prototype devices. Recently, a breakwater-integrated OWC-WEC system was proposed to improve the economic feasibility by reducing the construction and installation costs […]