Process design of onboard membrane carbon capture and liquefaction systems for LNG-fueled ships

Abstract This study proposes an onboard membrane carbon capture and liquefaction system for LNG-fueled ships to satisfy the IMO’s 2050 greenhouse gas reduction targets. The exhaust gas from a natural gas ship has a low CO2 fraction (∼3%) and high O2 fraction (∼16%) compared to the flue gas from power plants. Herein, considering the above distinguishing features, a membrane […]

Object Detection Method for Ship Safety Plans Using Deep Learning

Abstract During the safety inspection of a ship, there is a stage confirming whether the safety plan is designed in accordance with the regulations. In this process, an inspector checks whether the location and number of various objects (safety equipment, signs, etc.) included in the safety plan meet the regulations. Manually converting the information of […]

Numerical method to determine the cavitation inception speed of a submarine propeller based on the noise obtained from bubble dynamics

Abstract Cavitation is accompanied by increased hull vibrations, reduced propulsion performance, and increased radiated noise. This can be particularly fatal for warships and submarines. Hence, navies worldwide introduced and managed a propeller performance index called cavitation inception speed (CIS). Among the many types of propeller cavitation, the first to occur is tip vortex cavitation (TVC). In this paper, the CIS decision procedure of TVC […]

A method to generate a pipe model to compensate for low congestion level of 3D geometry available at the early stage of detailed design

Abstract For a recent explosion risk assessment, a CFD (computational fluid dynamics)-based simulation has been widely employed using a 3D geometry model for a gas dispersion and an explosion simulation. For an accurate determination of explosion design loads, extensive scenarios covering various leak locations, leak directions, leak rate, wind directions and so on are treated in the simulation. In […]

Compressive Underwater Sonar Imaging with Synthetic Aperture Processing

Abstract Synthetic aperture sonar (SAS) is a technique that acquires an underwater image by synthesizing the signal received by the sonar as it moves. By forming a synthetic aperture, the sonar overcomes physical limitations and shows superior resolution when compared with use of a side-scan sonar, which is another technique for obtaining underwater images. Conventional […]

The Effect of High Glass Fiber Content and Reinforcement Combination on Pulse-Echo Ultrasonic Measurement of Composite Ship Structures

Abstract Ship structures made of glass fiber-reinforced polymer (GFRP) composite laminates are considerably thicker than aircraft and automobile structures and more likely to contain voids. The production characteristics of such composite laminates were investigated in this study by ultrasonic nondestructive evaluation (NDE). The laminate samples were produced from E-glass chopped strand mat (CSM) and woven […]

Optimal Process Design of Small Scale SMR Process for LNG Vessel

Abstract Recently, due to regulations on emissions of vessels, fuel is changing to liquefied natural gas (LNG). When using LNG as fuel, it is advantageous in terms of fuel saving and boil-off gas control if a small-scale liquefaction process is installed on the ship. However, due to the limited space, the small-scale liquefaction process for […]

Hybrid NHPSO‐JTVAC‐SVM Model to Predict Production Lead Time

Abstract In the shipbuilding industry, each production process has a respective lead time; that is, the duration between start and finish times. Lead time is necessary for high-efficiency production planning and systematic production management. Therefore, lead time must be accurate. However, the traditional method of lead time management is not scientific because it only references […]

Source Type Classification and Localization of Inter-Floor Noise with a Single Sensor and Knowledge Transfer between Reinforced Concrete Buildings

Abstract A convolutional neural network (CNN)-based inter-floor noise source type classifier and locator with input from a single microphone was proposed in [Appl. Sci. 9, 3735 (2019)] and validated in a campus building experiment. In this study, the following extensions are presented: (1) data collections of nearly 4700 inter-floor noise events that contain the same noise […]