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CFD SIMULATIONS FOR TRAJECTORY PREDICTION OF AN UNDERWATER GLIDER UNDER THE INFLUENCE OF ocean CURRENTS

Journal of Taiwan Society of naval Architects and Marine Engineers 2023年第3期42卷 129-137页

作者： Chen, H.-C. Liu, T.-L. Pan, K.-C. Master Program of Naval Architecture and Ocean Engineering CCIT National Defense University Taiwan Department of Power Vehicle and Systems Engineering CCIT National Defense University Taiwan

The Autonomous Underwater Glider (AUG) is equipped with a self-adjusting buoyancy engine, allowing it to modify its buoyancy and center of gravity. Through this capability, the AUG can control its motion and achieve both ascending and descending movements. The theoretical mechanism employed by the AUG for adjusting its depth is based on this motion control. However, as an energy-efficient underwater vehicle, the AUG primarily relies on ocean currents for propulsion, which significantly impacts its trajectory in terms of direction and speed. Therefore, trajectory planning plays an indispensable role in the AUG's mission of collecting oceanographic data, highlighting its critical importance. To address this issue, this research aims to apply Computational Fluid Dynamics (CFD) numerical simulations to predict the glider's trajectory under the influence of ocean currents. This analysis will help construct an appropriate operational mode for the underwater glider in various oceanic environments. Regarding the application of CFD to predict the underwater glider's trajectory influenced by ocean currents, the preliminary flow field simulation analysis and feasibility study have been completed. From the simulation results, it is evident that variations in ocean current velocity will have a substantial impact on the glider's initial motion attitude, horizontal speed, as well as the distance covered during each diving and ascending phase. The research findings are expected to significantly contribute to the design and development of a new domestic underwater glider. © 2023 Taiwan Society of naval Architects and Marine Engineers. All rights reserved.

关键词： ocean currents

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Structural Assessment Review of Type-C Independent Tank in LNG Bunkering Ship 1

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6th International Conference and Exhibition on Sustainable Energy and Advanced Materials, ICE-SEAM 2019

作者： Muttaqie, Teguh Lee, Seung Geon Cho, Sang-Rai Sohn, Jung Min Department of Naval Architecture and Marine System Engineering Pukyong National University Busan48513 Korea Republic of Jakarta10340 Indonesia School of Naval Architecture and Ocean Engineering University of Ulsan Ulsan Korea Republic of Interdisciplinary Program Marine Convergence Design Pukyong National University Busan48513 Korea Republic of

ISBN: (数字)9789811544811

ISBN: (纸本)9789811544804

In recent years, Liquefied Natural Gas (LNG) becomes one of the most suitable solutions to fulfil world primary eco-friendly energy demand. Consequently, bunkering ship is designed to charge liquefied gas with the increasing need for natural gas. Due to the extremely dangerous and cryogenic cargo, the design of LNG bunkering ship requires very high-level structural design/analysis technologies rather than conventional ships. Therefore, this paper describes a general procedure of the structural safety assessment for the independent type C tank of LNG bunkering ship. It aims to present a complete procedure for strength evaluation of independent type C tank including hull strength assessment. © 2020, Springer Nature Singapore Pte Ltd.

关键词： FE analysis LNG bunkering ship LNG type C tank Structural assessment review

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STUDY ON ROBUST DESIGN FOR UNDERWATER IDENTIFICATION OF MULTI-FUNCTIONAL SMALL SURFACE VEHICLES

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Journal of Taiwan Society of naval Architects and Marine Engineers 2022年第3期41卷 131-139页

作者： Lin, C.-C. Hung, C.-H. Huang, S.-H. Chang, K.-C. Department of Power Vehicle and Systems Engineering CCIT National Defense University Taiwan Master Program of Naval Architecture and Ocean Engineering CCIT National Defense University Taiwan

Following with the age of technology, many advanced continuous developing the multi-functional small sur-face boats, and applied to the real-time monitoring of the near-shore environment, salvage and search operations, and marine disaster early warning and other livelihood purposes. The field of military operations includes intelligence reconnaissance, offshore reconnaissance and patrol, protecting the fishing vessels, and anti-terrorism tasks, anti-mine warfare and target ships for shooting training and other related military fields. In this study, the unmanned surface vehicle is the catamaran that equipped with single-beam sonar system, and used the Taguchi experimental design method, analysis of variance to discuss the effect of each controllable factor on the identification ability under water. The difference analysis is helpful to improve the underwater identification ability of unmanned surface vehicles. In addition, based on this study results, the best factor-level combination is A1B3 (such as low ship’s speed and located the sonar device near free-surface). To achieve the robust design, the dynamic navigation time of un-manned surface vehicles and enhance the underwater identification performance, it can provide reference for other units. © 2022 Taiwan Society of naval Architects and Marine Engineers. All rights reserved.

关键词： Sonar

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Toward green and sustaianable ship recycling industry in Indonesia 6

Toward green and sustaianable ship recycling industry in Ind...

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6th International Conference on Ship and Offshore Technology - Indonesia: Developments Marine Design, Construction and Operation, ICSOT Indonesia 2019

作者： Sunaryo Djatmiko, E.B. Kurt, R.E. Naval Architecture and Marine Engineering Study Program Universitas Indonesia Indonesia Department of Marine Engineering Institut Teknologi Sepuluh Nopember Indonesia Department of Naval Architecture Ocean and Marine Engineering University of Strathclyde United Kingdom

ISBN: (纸本)9781713830368

The main aim of this project is to develop a sustainable, safe & environmentally sound ship recycling industry in Indonesia. As the world's largest archipelago state, it is essential for Indonesia to maintain a large fleet of ships to ensure sufficient sea transportation. However, after completing their operational life, all these ships are required to be dismantled. Currently, there is no proper understanding & infrastructure for 'Ship Recycling' in Indonesia yet. This lack of understanding causes serious contamination of the sea which results in harming the environment. Furthermore, the working conditions are extremely poor because the yards are not fit for purpose and workers are exposed to many hazards. Referring to International Maritime Organization’s Hong Kong Convention a project is carried out to preparing the process of establishing green and sustainable ship recycling industry in Indonesia by conducting gap analyses and proposing environmentally friendly ship recycling yard concept. © 2019: The Royal Institution of naval Architects.

关键词： Ships

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Critical Success Factors of the Brazilian Offshore Support Vessel Industry: A Flexible Systems Approach

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Global Journal of Flexible Systems Management 2020年第1-Sup期21卷 33-48页

作者： Queiroz, Maciel M. Mendes, André Bergsten Postgraduate Program in Business Administration Universidade Paulista - UNIP R. Doutor Bacelar 1212 São Paulo 04026-002 Brazil Department of Naval Architecture and Ocean Engineering University of Sao Paulo Av. Prof. Mello Moraes 2231 São Paulo 05508-030 Brazil

The offshore support vessel (OSV) industry is essential to the successful exploration and production of oil and gas at sea. Understanding the factors that dictate this industry’s success is crucial and can indicate the actions that must be taken by industry players to survive in this market. Despite the Brazilian OSV industry being part of an extensive supply network, decision-makers operating in this industry still do not know what the critical success factors (CSFs) are, which has implications for the flexibility of companies in this industry. In this context, this paper is devoted to the identification of the CSFs of the OSV industry in Brazil, a country that obtains 95% of its oil production from the sea and that has faced economic and political turbulence in recent years. In this study, nine macro CSFs and 25 micro CSFs were identified through a mixed-methodology approach. This study provides insights both for scholars and practitioners involved in not only the OSV industry but the entire oil and gas supply chain. © 2020, Global Institute of Flexible Systems Management.

关键词： Critical success factors Latin America Offshore support vessels Oil and gas Supply network

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The role of social influence in blockchain adoption: The Brazilian supply chain case

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IFAC-PapersOnLine 2019年第13期52卷 1715-1720页

作者： Wamba, Samuel Fosso Queiroz, Maciel M. Toulouse Business School - TBS Information Operations and Management Sciences ToulouseCO31068 France Paulista University - UNIP Postgraduate Program in Administration São PauloCO04026-002 Brazil University of São Paulo Naval Architecture and Ocean Engineering São PauloCO05508-030 Brazil

The aim of this study is to understand the blockchain adoption behaviour in Brazilian supply chains. Specifically, the study aims to unlock the potential of social influence; taking into consideration workers from the Brazilian supply chains. We proposed a model using constructs from a unified theory of acceptance and the use of technology (UTAUT). The models were analysed using partial least squares structural equation modelling (PLS-SEM) and the findings indicated the power of social influence in predicting other UTAUT constructs. In addition, this study shows the mediation effect of effort expectancy and the facilitating conditions in the relationship between social influence and the behavioural intention to adopt blockchain. Finally, our findings bring essential theoretical and managerial implications. © 2019, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Economic and social effects

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Ultimate Strength Assessment of Steel-Welded Hemispheres under External Hydrostatic Pressure

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Journal of Marine Science and Application 2020年第4期19卷 615-633页

作者： Sang-Rai Cho Teguh Muttaqie Seung Hyun Lee Jaewoo Paek Jung Min Sohn Ulsan Lab Inc.UlsanSouth Korea School of Naval Architecture and Ocean Engineering University of UlsanUlsanSouth Korea Department of Naval Architecture and Marine Systems Engineering Pukyong National UniversityBusanSouth Korea Agency for the Assessment and Application of Technology Center of Technology for Defense and Security Industries-BPPTJakartaIndonesia Hyundai Mipo Dockyard UlsanSouth Korea Hyundai Heavy Industries UlsanSouth Korea Interdisciplinary Program of Marine Convergence Design Pukyong National UniversityBusanSouth Korea

This paper focusses on steel-welded hemispherical shells subjected to external hydrostatic *** experimental and numerical investigations were performed to study their failure *** model was fabricated from mild steel and made through press forming and *** therefore considered the effect of initial shape imperfection,variation of thickness and residual stress obtained from the actual *** hemisphere models designed with R/t from 50 to 130 were tested until *** to the test,the actual geometric imperfection and shell thickness were carefully *** comparisons of available design codes(PD 5500,ABS,DNV-GL)in calculating the collapse pressure were also highlighted against the available published test data on steel-welded ***,the nonlinear FE simulations were also conducted to substantiate the ultimate load capacity and plastic deformation of the models that were *** dependence of the level of sphericity,varying thickness and residual welding stresses were also numerically considered in the benchmark *** structure behaviour from the experiments was used to verify the numerical *** this work,both collapse pressure and failure mode in the numerical model were consistent with the experimental model.

关键词： Steel-welded hemisphere Collapse pressure Experiment Nonlinear FEA Ultimate strength formulation

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Computational investigation into resistance characteristics of a full-scale pusher-barge system

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AIP Conference Proceedings 2022年第1期2543卷

作者： Ahmad Fitriadhy Nur Amira Adam Raja Noor Syaheeda Faisal Mahmuddin Suandar Baso Mohd Azlan Musa Anuar Abu Bakar Mohd Asamudin A. Rahman Mohd Hairil Mohd 1)Program of Naval Architecture Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu 21030 Kuala Terengganu Terengganu Malaysia 2)Program of Boat Making Technology Department of Mechanical Kolej Vokasional Pasir Gudang Johor Malaysia 3)Department of Marine Engineering Faculty of Engineering Hasanuddin University Jalan Poros Malino km. 6 Bontomarannu 92172 Gowa Sulawesi Selatan Indonesia 4)Department of Naval Architecture Faculty of Engineering Hasanuddin University Jalan Poros Malino km. 6 Bontomarannu 92172 Gowa Sulawesi Selatan Indonesia

In the presence of hydrodynamic motion interference between pusher and multiple barge configurations, a reliable investigation allowing an accurate prediction of her total resistance is obviously required. To achieve such objective, the Computational Fluid Dynamics (CFD) approach is then proposed to predict the total ship’s resistance of a pusher-barge system in the calm water condition. The various barge’s configurations incorporated with various Froude numbers (Fr) have been considered in the computational simulation incorporated with the full-scale dimension of the pusher-barge. In general, the CFO results revealed that the total resistances of the various configurations of the pusher-barge system had a qualitatively good agreement with the experimental model test results. Merely, the increase of Froude number (Fr=0.128 to 0.308) was proportional to the magnitude of total resistance. In addition, the pusher-barge system of the 33BP configuration provides the highest resistance as compared to others. It should be noted here that the pusher-barges configurations led to the susceptible effect to the total ship’s resistance which resulted in remarkable increase of the effective power values as the substituting their arrangements from the longitudinal configurations and to the lateral ones. This finding provides a very valuable insight aimed at selecting the proper pusher-barge configurations towards reducing the total ship’s resistance.

关键词：

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Estimation model of energy efficiency operational indicator using public data based on big data technology 28

Estimation model of energy efficiency operational indicator ...

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28th International ocean and Polar engineering Conference, ISOPE 2018

作者： Park, Sung-Woo Roh, Myung-Il Oh, Min-Jae Kim, Seong-Hoon Lee, Won-Joon Kim, In-Il Kim, Chang-Yong Interdisciplinary Program in Offshore Plant Engineering Seoul National University Seoul Korea Republic of Department of the Naval Architecture and Ocean Engineering Research Institute of Marine Systems Engineering Seoul National University Seoul Korea Republic of Research Institute of Marine Systems Engineering Seoul National University Seoul Korea Republic of Department of Naval Architecture and Ocean Engineering Seoul National University Seoul Korea Republic of R and D Institute Daewoo Shipbuilding and Marine Engineering Seoul Korea Republic of

ISBN: (纸本)9781880653876

This study proposes a model to calculate EEOI (Energy Efficiency Operational Indicator) using only public data without any actual operating data which are measured during ship operation. EEOI is usually calculated using the measured information, but since the information is not available except the ship operator, we propose a model using only public data. The public data is including AIS (Automatic Identification System) data and marine environment data. Since the public data mentioned above have a large capacity, it is difficult to estimate the energy efficiency by existing data processing method. Therefore, in this study, big data technology was studied and applied to utilize the large capacity of public data effectively. The proposed model was applied to the example ship to estimate the ship energy efficiency indicator, and the effectiveness of the model was evaluated by comparing the actual results. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Energy efficiency

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Analysis of pipeline installation in unplanned flooding condition

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Marine Systems and ocean Technology 2017年第3期12卷 187-195页

作者： Ribeiro, Luiz Fellipe F. A. Vaz, Murilo Augusto Department of Naval Architecture and Ocean Engineering Federal University of Rio de Janeiro Rio de Janeiro Brazil Ocean Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil

During installation of subsea pipelines contingencies may occur, compromising their structural integrity. Therefore, it is important to predict the consequences to the pipe integrity during unplanned flooding scenario, which may result from pipeline fracture from overbend if the laying vessel loses position or if valves are accidentally installed open or leak. This paper evaluates the global static configuration and the capability of a subsea pipeline to resist to combined loading consisting of hydrostatic pressure, bending moment, and tension, using two catenary equations, considering one cable segment heavier than the other one to represent the flooded part. In addition, in order to evaluate the viability of laying a pipeline in unplanned flooding condition, DNV limit equations are employed. The developed methodology might be used as a conceptual design guidance given its simplicity and reasonable accuracy. © 2017, Sociedade Brasileira de Engenharia naval.

关键词： Conceptual design

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