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Study on the seawater cooled PRHRS of a nuclear propulsion ship with the upper heat exchanger for driving force and the seawater heat exchanger as an ultimate heat sink Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2024-03-14 Yong Hwan Yoo, Han Koo Jeong, Wooseong Park, Soo Hyoung Kim, Yong Hoon Jeong, Hag Tae Kim
As international maritime trade among countries increases, great efforts are being made to reduce the amount of greenhouse gases emitted from ships using conventional fossil fuels. A variety of environment-friendly power sources for ships are being considered, and nuclear energy is one of them. The research described in this paper focuses on elemental technologies related to nuclear-powered ships rather
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Real-time prediction of wave-induced hull girder loads for a large container ship based on the recurrent neural network model and error correction strategy Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2024-02-25 Qiang Wang, Pengyao Yu, Mingdong Lv, Xiangcheng Wu, Chenfeng Li, Xin Chang, Lihong Wu
Real-time acquisition of wave-induced hull girder loads of a sailing ship will help the captain make reasonable decisions, which is of great significance for improving the safety of the ship's navigation. This paper investigates the real-time prediction method of hull girder loads based on the Recurrent Neural Network (RNN) model and error correction strategy. Firstly, taking the vertical bending moment
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Method for anti-collision path planning using velocity obstacle and A* algorithms for maritime autonomous surface ship Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2024-02-04 Donghun Yu, Myung-Il Roh
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Experimental validation on structure-borne underwater radiated noise transfer function analysis for marine structure Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2024-01-22 Joo-Yeob Lee, Dae-Seung Cho, Kookhyun Kim, Sung-Ju Park
In this paper, an experimental validation of a numerical procedure for estimating the structure-borne underwater radiated noise (URN) transfer function (TF) of a marine structure based on the SEA theory has been performed. For the purpose, the structure-borne URN TF of a central point-excited one-side fluid-loaded four-edge stiffened plate in a reverberant water tank has been measured and compared
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Whale optimized routing path selection and 128 bit secured key management for maritime safety Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2024-01-18 Maharajan Arumugam, Kumar Parasuraman
The critical aspect in advancing global trade lies in ensuring security across marine trading systems. This research significantly contributes to monitoring ships by assessing operational performance parameters. These parameters are sensed through ship-attached sensors, and further transmitted to the cloud via an Internet of Things (IoT) Module. To optimize the efficiency of this data transfer to the
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Assessment of ship-block stacking status based on images obtained from drone and geographic information system data Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2024-01-17 Young-Soo Han, Kyungho Lee, Byeongwook Nam, Yang Ouk Kim, Youngsu Kim, Hyeon-Bin Yeo
Ships are constructed using the shipbuilding method, which involves several blocks. Every block produced in each unit process features a different production speed depending on the block shape, number of members used, and process complexity. Consequently, the blocks produced in one process is stored in the stockyard for the next process operation. As the number of blocks stacked in the stockyard increases
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Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2024-01-12 So-Won Jeong, Van-Duyen Pham, Byoung-Kwon Ahn, Bu-Geun Paik
In this study, physical aspects of a ventilated supercavity behind different cavitator geometries such as the hydrodynamic characteristics, distribution of pressure within the cavity, hysteresis phenomenon, and gas leakage mechanism were qualitatively and quantitatively investigated using experimental and numerical methods. For the simulation and tunnel tests, we employed five cavitators, each with
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Linear diffraction and radiation theory of water waves by a truncated vertical circular cylinder with heave plate in deep and shallow drafts Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2024-01-03 Seung-Yoon Han, Benjamin Bouscasse, Vincent Leroy, David Le Touzé
A first-order analytical theory on a truncated and surface-piercing vertical circular cylinder with a circular plate mounted at the bottom of the cylinder was generalized to solve the linear wave diffraction and radiation problems based on potential flow and the hypothesis of small wave and motion amplitudes. The domain was decomposed, and the linearized velocity potentials were derived in each subdomain
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Natural language processing-based approach for automatically coding ship sensor data Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-29 Yunhui Kim, Kwangphil Park, Byeongwoo Yoo
The digital transformation of ship systems requires the coding and management of large amounts of Input/Output (IO) data generated by various pieces of equipment during ship operation. In this study, we investigated a method that recognizes the text of the IO description of a ship to automatically code IO data. Accordingly, the characteristics of the IO descriptions were extracted using Term Frequency-Inverse
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Editorial Board Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-23
Abstract not available
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A numerical study on the optimization of the slit shape of a jet injection propeller Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-23 Jun-Hee Lee, Ju-Han Lee, Myeong-Min Kim, Dohan Oh, Kwang-Jun Paik
The shape of the slit that injects the jet from the surface of the propeller was optimized through numerical computations. The high-pressure drop on the propeller surface caused by jet injection could be improved by modifying the hydrofoil geometry of the propeller. As the cover length increased and the slit was located at the center of the propeller, the volume of jets leading to the trailing edge
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Method for collision avoidance based on deep reinforcement learning with path-speed control for an autonomous ship Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-22 Do-Hyun Chun, Myung-Il Roh, Hye-Won Lee, Donghun Yu
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Experimental and numerical study on the high-speed ship hydrodynamics influenced by an interceptor with varied angle of attack Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-21 Arfis Maydino Firmansyah Putra, Hiroyoshi Suzuki
Efforts to improve the hydrodynamic performance of high-speed ships have been underway for a long time. There are different approaches, one of which is to take advantage of an interceptor. Conventionally, the interceptor blades are mounted vertically on the ship's bottom transom, oriented at a zero-degree angle of attack (AoA). This study comprehensively explores high-speed ships' hulls with and without
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Evaluation of subgrid scale models in turbulent large eddy simulations of pumpjet propulsor Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-19 Lin Ke, Jinming Ye, Wei He
To assess the effectiveness of subgrid scale (SGS) models on the prediction results of unsteady loads and turbulent fluctuation of pumpjet propulsors equipped with both front and rear stators, a pumpjet propulsor computational model with attached parts at the model scale is developed using a fully structured mesh, and large eddy simulations are conducted. The computational results of the different
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A fundamental study on structural strength assessment of U-bolts for expanded application to shipbuilding and offshore piping systems Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-10 Minsung Chun, Jinyoung Kim, Kangho Kim, Daseul Jeong, Deokyeon Lee, Sungkuk Wi, Byeonghwa Kim, Cheonghak Kim, Chun-Sik Shim
The currently defined Safe Working Load (SWL) of the U-bolt has been determined excessively conservatively. To address this issue, this study conducted structural tests and numerical analysis on round type U-bolts of various sizes. The structural tests were conducted using a 2.5 MN actuator at the SURF R&D center, and the strain was measured through a uniaxial strain gage. The test showed the failure
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A novel formula for predicting the ultimate compressive strength of the cylindrically curved plates Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-15 Do Kyun Kim, Andy Ming King Wong, Jinha Hwang, Shen Li, Nak-Kyun Cho
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A numerical study of added resistance performance and hydrodynamics of KCS hull in oblique regular waves and estimation of resistance in short-crested irregular waves through spectral method Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-12 Soon-Hyun Lee, Cheolho Kim, Kwang-Jun Paik, Hyeongjun Kim, Jangho Chun
Research on multidirectional waves is increasing as studies on added resistance advance. In this study, the added resistance of the multidirectional regular waves of the KCS hull was estimated by numerical analysis. The direction of the grid was changed according to the heading angle to consider waves in multiple directions. In addition, the method in which the entire domain moved along the movement
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A numerical study on the feasibility of predicting the resistance of a full-scale ship using a virtual fluid Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-10 Kwan-Woo Kim, Kwang-Jun Paik, Soon-Hyun Lee, Jun-Hee Lee, Soo-Yeon Kwon, Dohan Oh
In general, the resistance of a real ship is estimated using an extrapolation method after doing experimental tests or numerical simulations with a model scale ship. Since the only Froude similarity is applied in the model test and simulation, the flow characteristics between the model and real ships could be different due to the inconsistency of Reynolds number. However, in the Computational Fluid
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Feasibility study of shell element-based elastic FE approach for welding-induced thermal distortion prediction in HDPE welded structures Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-12-05 Jae-Min Lee
High-density polyethylene (HDPE) is considered an eco-friendly material for boat construction worldwide. However, managing thermal distortion in HDPE welding is challenging, impacting productivity. Traditional steel shipbuilding has established methods to predict welding-induced thermal distortion, but HDPE lacks comprehensive studies and standards. This research explores applying the elastic Finite
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A study on PID controlled self-propulsion and turning simulations based on the URANS CFD free running approach Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-11-17 ChangSeop Kwon, SeongMo Yeon, Dong-Jin Kim, Kunhang Yun, Yeon-Gyu Kim, SeungHyun Hwang
In this study, the proportional, integral, and differential control constants for a self-propulsion point search were investigated using free running Computational Fluid Dynamics (CFD) simulations. The experimental data obtained using a 1/100 scale model of KVLCC2 were used to verify the calculation results. A range of initial propeller rotational speeds from 30% to 140% of the self-propulsion point
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Comparison of structural design and future trends in composite hulls: A regulatory review Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-11-12 Zhiqiang Han, Jaewon Jang, Jean-Baptiste R.G. Souppez, Hyoung-Seock Seo, Daekyun Oh
Recently, the International Organization for Standardization (ISO) standards associated with composite hull-structure design, including the method for estimating the mechanical properties of laminates necessary for design, have been revised. This study reviews the revisions concerning materials and analyzes the design trend of composite hull structures by comparing eight related rules, including classification
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Research on self-propulsion simulation of a polar ship in a brash ice channel based on body force model Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-11-07 Chang Xie, Li Zhou, Shifeng Ding, Mingfeng Lu, Xu Zhou
Main engine power prediction is important for polar ships operating in brash ice channels, which is one of the most important concerns of shipowners. Self-propulsion simulation is an efficient method to predict the developed power. At present, such models as the discretized propeller model (DPM) and the body force model (BFM) are used for self-propulsion simulation. However, these models are often
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Computational analysis of strut effects on a BB2 submarine at drift angle 0, 6, and 12° Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-10-26 Junyoung Park, Woochan Seok
Struts are attached to a submarine to maintain its submerged depth when conducting the model tests. While previous studies have mentioned that the attachment of the struts has a negligible effect on the performance of a submarine, it is difficult to find studies that clearly explain the effects of the struts. The present study examines the effect of struts with a circular cross-section on the resistance
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Model-free adaptive discrete-time full-order sliding mode constrained control for path following of unmanned surface vessels Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-10-21 Shuang Gao, Hongli Hu, Yulong Tuo, Wei Liang, Zhongyi Huang
Considering the dynamic uncertainty, input saturation, and the discrete characteristics of digital control, a practical path following method is proposed for unmanned surface vessels (USV). Online identification for the heading model with uncertainty is presented based on a data-driven technique. Further, a constrained full-order terminal sliding manifold is constructed based on an auxiliary system
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Applicability and reliability of an experimental method measuring underwater acoustic radiation efficiency of floating box-type plate structures in a reverberant water tank Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-10-02 Joo-Yeob Lee, Kookhyun Kim, Sung-Ju Park, Dae-Seung Cho
This paper aims to investigate the applicability and reliability of an experimental method measuring the underwater acoustic radiation efficiencies of floating plate structures in a reverberant water tank. For the purpose, an experimental method for estimating the acoustic power of a source in a reverberant sound field has been introduced and applied to measure the acoustic radiation efficiencies of
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Wave attenuation by inclined porous plates using dual boundary element method Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-09-22 Hyunju Han, Il-Hyoung Cho
In this study, the wave attenuation by the inclined porous plates has been evaluated through a numerical approach. As a numerical method, we used the dual boundary element method (DBEM) that solves two distinct boundary integral equations (singular and hyper-singular) derived at the coincident source points on each side of the degenerate plate boundary. A quadratic velocity model with the porosity-dependent
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Streamlined semi-automatic data processing framework for ship performance analysis Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-09-14 Prateek Gupta, Young-Rong Kim, Sverre Steen, Adil Rasheed
The hydrodynamic performance of a sea-going ship can be analyzed using data from different sources, like onboard recorded in-service data, AIS data, and noon reports. Each of these sources is known to have its inherent problems. The current work highlights the most prominent issues, explained with examples from actual datasets. A streamlined semi-automatic approach to processing the data is finally
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Ship collision avoidance route planning using CRI-based A∗ algorithm Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-09-09 Chanhee Seo, Yoojeong Noh, Misganaw Abebe, Young-Jin Kang, Sunyoung Park, Cheolhyeon Kwon
This study presents a novel ship route planning algorithm that takes into account both operational economy and safety by integrating the A∗ algorithm with a collision avoidance algorithm that evaluates the Collision Risk Index (CRI) between the own ship and the target ship. The CRI-based A∗ algorithm defines a penalty zone, allowing the own ship to explore safe routes based on the International Regulations
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Parameter space exploration for the probabilistic damage stability method for dry cargo ships Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-09-07 Bas Milatz, Roy de Winter, Jelle D.J. van de Ridder, Martijn van Engeland, Francesco Mauro, Austin A. Kana
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Dieless bulging and nonlinear buckling of longan-shaped pressure hull Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-08-28 Rui He, Jian Zhang, Sakdirat Kaewunruen, Ming Zhan, Ping Liu
In this study, the dieless bulging and nonlinear buckling behaviours of a stainless longan-shaped pressure hull were investigated. According to the Cassini oval equation, the longan shape has a shape index of 0.1. The lengths of the major and minor axes of the designed longan-shaped pressure hull were approximately 400 and 396 mm, respectively. The wall thickness of this pressure hull was 1 mm. The
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Development of transporter training simulator based on virtual reality and vehicle dynamics model Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-08-26 Kwang-Phil Park, Seung-Ho Ham, Woo-Yong Lee, Byeong-Woo Yoo
A transporter is a means of transportation that is widely used in heavy industries to move heavy loads called blocks. Because the transporter has a more complex operating system compared to the regular car, it takes a lot of time to become familiar with its operation. However, it is not easy to find a proper place and a transporter for training operators. As a result, the number of accidents caused
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Performance analysis of a fuel cells integrated system utilizing Liquified Natural Gas as fuel for a green shipping target Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-08-19 Phan Anh Duong, Bo Rim Ryu, So Soon Kyu, Hyeonmin Jeon, Hokeun Kang
In this study, a system integrating Solid Oxide Fuel Cells (SOFC) fueled by Liquefied Natural Gas (LNG) for marine vessels is proposed and analyzed. The system comprises Proton Exchange Membrane Fuel Cells (PEMFC), Organic Rankine Cycle (ORC), Gas Turbine (GT), Steam Rankine Cycle (SRC), and Waste Heat Boiler (WHB) combined with the SOFC system to enhance power generation and system performance. The
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Application of stochastic risk simulation to increase depth of production planning Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-08-12 Peter Burggräf, Tobias Adlon, Richard Minderjahn, Niklas Schäfer, Torge Fassmer
This paper presents a procedure model that allows for a systematic analysis of execution risk in ship production by using stochastic risk simulation. Hence, planners can increase the depth of production planning to reduce disruptions and delays even with insufficient information density. The derived four-step model was then applied to the planning process at a German shipyard. Effects and probabilities
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Dynamic responses and robustness performance to moving boundary of double-stepped cable during deep-sea mining Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-08-12 Yilun Li, Shuangxi Guo, Yucheng Guo, Xiaoqi Yu, Weimin Chen, Jixiang Song
As the exploration and exploitation of deep-sea oil and gas, along with promising polymetallic nodule&sulfides mining, have been developing toward ultra-deep waters, some innovative concepts of marine cable configuration suitable for ultra-deepwater are proposed, such as stepped cable, hybrid cable and double-stepped cable. For deep-water cables with complex configurations, the structural responses
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Wave height measurement scheme using wave detector based on convolutional neural network and PPM calculator with ocean wave images Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-08-05 Il-Kyu Hwang, Minkyu Lee, Junsub Han, Jeeun Choi
The measurement of wave height is essential for weather analysis, safe navigation of ships, and ship design. This study proposes a low-cost and direct method for measuring wave height using ocean wave images. The proposed scheme comprises a Wave Detector based on Convolutional Neural Networks that takes two-dimensional ocean images as input, and a PPM Calculator that measures the size of an object
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Moored motion prediction of a semi-submersible offshore platform in waves using an OpenFOAM and MoorDyn coupled solver Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-08-05 Wooyoung Jeon, Sunho Park, Seokkyu Cho
In this study, the motions of a moored buoy and its surrounding fluid flow are numerically studied. The solver is developed by coupling the computational fluid dynamics platform, OpenFOAM, with a lumped mass mooring line model, MoorDyn. The time marching interface to transfer the solution variables is developed for the robustness and accuracy of the solver. The developed coupled solver was validated
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Investigation of the effect of adaptive characteristics on non-cavitating noise for flexible propeller in non-uniform flow via the fluid-structure interaction model Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-07-25 Yo-Seb Choi, Suk-Yoon Hong, Jee-Hun Song
When constructing a low-noise submarine, it is crucial to consider the non-cavitating noise from the propeller. Non-cavitating noise reduction is crucial for submarine stealth and survivability. Recently, several studies have been conducted on the use of flexible propellers as a means of reducing non-cavitating noise. However, there are no studies on the use of flexible propellers with adaptive characteristics
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A study on the matching problem of engine, propeller, and ship hull under actual service conditions Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-07-25 Thai Gia Tran, Hyun Cheol Kim
In ship design, the matching of engine, propeller, and hull is an analytical process to establish the optimal operating mode so that the engine works safely with full power and the lowest fuel consumption, and a ship reaches desired speed. In theory, the operating process of the engine, hull, and propeller is usually expressed by their characteristics, and the matching problem is solved by finding
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Fatigue assessment for FPSO hawsers Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-07-20 Vladimir Yakimov, Oleg Gaidai, Fang Wang, Xiaosen Xu, Yuhao Niu, Wang Kelin
Floating Production Storage and Offloading Unit (FPSO) is designed to produce, store and transport hydrocarbon products. FPSO's hawsers may be exposed to both extreme and fatigue loads during operations. Hence prediction of their fatigue life is important for operational safety. During some unloading operations, consistent hawser tensions could develop as a result of internal friction in nylon ropes
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Experimental study on the towing stability of a towed underwater object Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-07-13 Jongyeol Park, Shin Hyung Rhee, Jong-Beom Im, Ba Han Ji, Seung Jin Lee
The towing stability of a towed underwater object was investigated through towing tank model tests. Three types of towing cables were employed, and the attitude of a towed object was measured by an inertial measurement unit. The towed object's geometry and the position of the towing point were fixed. The lower center of gravity enabled the positive pitch moment due to the increased moment arm and reduced
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Establishment of empirical formulae for hydrodynamic derivatives of submarine considering design parameters Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-07-02 Thi Loan Mai, Myungjun Jeon, Anh Khoa Vo, Hyeon Kyu Yoon, Seonhong Kim, Jooho Lee
The hydrodynamic derivatives are necessary for assessing the dynamic characteristics, such as dynamic stability and maneuverability which are crucial in evaluating navigation safety and operational efficiency. Hence, it is required to compute the hydrodynamic derivatives precisely. This study nominates the new empirical formulae for predicting the hydrodynamic derivatives of a submarine. The proposed
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A numerical experiment on a new piston-type wavemaker: Shallow water approximation Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-06-17 Jinsoo Park, Daeseung Cho, Taeksoo Jang
In this paper, we present a numerical experiment on a new piston-type wavemaker using a recently proposed piston-type wavemaker theory. The theory was primarily derived from the classical Boussinesq equation, based on the Pseudo-parameter Iteration Method (PIM). We first use the new theory to observe low amplitude propagating solitary waves and cnoidal waves, whereby we see the workability and validity
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Prediction of cavitation dynamics and cavitation erosion around a three-dimensional twisted hydrofoil with an LES method Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-06-17 Pengpeng He, Ziru Li, Qian Liu, Xiaowang Zhang, Wei He
The Large Eddy Simulation (LES) method coupled with a Schnerr and Sauer cavitation model was adopted to simulate the unsteady cavitating flow around a Delft Twist 11 (Twist11) hydrofoil. We proposed a novel aggressiveness indicator to predict the risk of cavitation erosion on the hydrofoil surface by utilizing LES simulations as input. The proposed aggressiveness indicator introduces the time-averaged
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A case study for 3D scanning-based quantitative quality control during key stages of composite small craft production Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-06-05 Dong-Kun Lee, Bon-Yeong Park
Composite small crafts are manufactured in a job-shop system that prioritizes delivery times and creates various small-scale products using flexible equipment and worker operations. The process involves layering composite materials onto a mold to form the product through molding. Three intermediate stages must be completed before the final product, including mock-up, mold, and small craft. The stability
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Method for pipe routing using the expert system and the heuristic pathfinding algorithm in shipbuilding Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-05-26 Jisang Ha, Myung-Il Roh, Ki-Su Kim, Jin-Hyeok Kim
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Development and experimental testing of a collaborative design rationale method for early-stage ship layout design Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-05-26 Joan le Poole, Etienne Duchateau, Hans Hopman, Austin A. Kana
Design rationale is a promising way of capturing design decisions and considerations for later retrieval and traceability to improve collaborative design decision-making. To achieve these perceived benefits for early-stage complex ship design, this paper first elaborates on the development of a proof-of-concept design rationale method. The method aims to aid ship designers in the continuous capturing
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Optimal arrangement design of pipeline support by considering safety and production cost Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-05-10 In-Chang Yeo, Myung-Il Roh, Do-Hyun Chun, Seok Ho Jang, Jae Won Heo
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Potential energy savings of air lubrication technology on merchant ships Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-05-01 Young-Rong Kim, Sverre Steen
As the reduction of greenhouse gas emissions has become an important issue, measures and devices to reduce energy consumption are in increasing demand. In this study, the potential energy saving due to the application of air lubrication technology in merchant ships is analyzed. We propose a simplified empirical model, covering three different air lubrication technologies, based on the experimental
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An energy-efficient hierarchical algorithm of dynamic obstacle avoidance for unmanned surface vehicle Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-04-19 Jiaqi Wang, Shixin Li, Boyang Li, Chenyu Zhao, Ying Cui
Most of the existing studies developed and improved local path planning algorithms independently of global planning, i.e., ignoring the global optimal constrains. To meet the requirements of practical applications, this paper presented an energy-efficient hierarchical collision avoidance algorithm for unmanned surface vehicle operating in clustered dynamic environments. For the global level, genetic
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Design optimization of asymmetric wave energy converter using artificial neural network model Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-04-14 Sunny Kumar Poguluri, Dongeun Kim, Yeonbin Lee, Jeong-Heon Shin, Yoon Hyeok Bae
The present study aims to improve the mean extracted power of a Wave Energy Converter (WEC) by mapping the parameters of its ballast weight and position, wave frequency, viscosity, and Power Take-Off (PTO) damping using an Artificial Neural Network (ANN) model. A total of 25 types of WEC rotors are designed with varying ballast weights and positions. The hydrodynamic coefficient and response of each
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CFD study to predict the effect of a passing ship on moored ships in a confined waterway Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-04-14 Chang Seop Kwon, Seong Mo Yeon
This study aims to present a practical practice to obtain a reliable numerical solution based on an Unsteady Reynolds Averaged Navier-Stokes (URANS) Computational Fluid Dynamics (CFD) to estimate the forces acting on moored ships during a passage of a ship in a confined waterway. The motion of the passing ship is implemented using an overset-grid method. The convergence of the numerical solutions depending
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Experimental study on wave motion of partial air cushion supported catamaran Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-04-11 Yang Jinglei, Sun Hanbing, Li Xiaowen, Wu Defeng
To study the performance of partial air cushion-supported catamaran (PACSCAT), which is sailing with a flexible air seal in waves, this paper uses the model tests, and research the motion characteristics of PACSCAT at different wavelengths, by monitoring the boundaries of heave, pitch, acceleration, air cushion pressure. Firstly this paper introduces the test situation of PACSCAT in the towing tank
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Real-time ship stability evaluation program through deterministic method based on second-generation intact stability Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-04-04 Kwang-phil Park, Jahun Ku, Jaeyong Lee, Namkug Ku
IMO suggests Second-Generation Intact Stability Criterion (SGISC), which consists of five failure modes, because of continuous accidents due to a lack of ship stability. In this study, Level 1 and Level 2 stability of SGISC were evaluated for three stability failure modes (Dead Ship Condition, Surf-riding, and Excessive Acceleration). Level 1 was calculated in the same way as the second-generation
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Comparative analysis of the thermodynamic performances of solid oxide fuel cell–gas turbine integrated systems for marine vessels using ammonia and hydrogen as fuels Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-03-14 Bo Rim Ryu, Phan Anh Duong, Hokeun Kang
To mitigate environmental issues and implement energy management strategies, hydrogen is emerging as the most promising and sustainable energy source to help achieve decarbonization targets and meet world energy demands. However, hydrogen poses significant storage and transportation challenges due to its low volumetric and gravimetric density. Hence, ammonia is a potential candidate for a hydrogen
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Experimental datasets of green water phenomenon on rectangular structure Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-03-11 Gang Nam Lee, Kwang Hyo Jung, Sung Bu Suh, Jaeyong Lee
The experimental dataset is presented for flow kinematics and pressure distribution of green water phenomenon on a rectangular structure. The green water experiments were performed in a 2-D wave flume with a fixed structure varying its flare angle under regular wave conditions. The structure and wave conditions were determined by scaling down with a ratio of 1:125 from the BW Pioneer Floating Production
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Comparative study on ammonia and liquid hydrogen transportation costs in comparison to LNG Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-03-06 Youngjun You, Sewon Kim, Joon Chae Lee
Since ammonia and liquid hydrogen are the optional future shipping cargo and fuels, the applicability was crucial using the current technologies and expectations. Existing studies for the economic feasibility of the energies had limitations: empirical evaluation with assumptions and insufficiency related to causality. A distorted estimation can result in failure of decision-making or policy in terms
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Analytic representation of the propeller thrust for modelling ship manoeuvring within an ice channel behind an icebreaker Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-03-04 Vadim K. Goncharov, Milena R. Kamaletdinova, Natalia Yu Klementieva, Faina I. Trebukh
Navigation of cargo ships using icebreaker assistance is a common tactic in difficult icy conditions. The icebreaker makes the ice channel and the lone cargo ship, or the convoy, sail within the channel it has made. When the icebreaker or the vessel ahead stop before the insuperable ice obstacle, the danger of an emergency appears, namely, the collision with an icebreaker or the ship ahead, if the
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Development of a hydrofoil wake oscillator model based on a near-vortex strength for predicting vortex-induced vibration on a hydrofoil Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-02-28 Hyun-Gyu Choi, Suk-Yoon Hong, Jee-Hun Song, Won-Seok Jang, Woen-Sug Choi
Recently, the evaluation of vortex-induced vibration has emerged as a significantly important issue owing to the development of high-speed and lightweight ships and submarines. To derive an accurate vortex-induced vibration response, it is essential to consider the fluid-structure interaction. Moreover, it is necessary to evaluate the generation of the fluid-structure interaction to effectively prevent
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Improvement of hull form for an 1,800 TEU containership toward reduced fuel consumption under in-service conditions Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-02-22 Yurim Cho, Seung Myun Hwangbo, Jin-Won Yu, Jonghyeon Lee, Yechang Park, Woo-Hyuk Jang, Inwon Lee
In the present study, the hull form of an 1,800 TEU containership was developed to reduce fuel consumption under real operation conditions. Contrary to the conventional hull form design practice in terms of the calm-sea performance, the hull form design in this study was aimed at improving the performance of a ship under in-service condition, which is closely associated with the added resistance due
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Entrance and run angle variations of hull form preserving the prismatic coefficient Int. J. Nav. Archit. Ocean Eng. (IF 2.2) Pub Date : 2023-02-21 Eun-Young Son, Min-Jae Oh, Se-Jin Oh, Myung-Soo Kim, Yoo-Chul Kim
There are several methods of hull form variation that can be used in initial ship design, such as offset variation, line variation, and hull form variable variation. Hull form variations are typically done manually, and different results can be obtained according to the designer's know-how. This study proposes a conversion method that uses the Free-Form Deformation method to vary the entrance angle