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检索条件"机构=Department of System Engineering and Naval Architecture"

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A Simplified Nonlinear Analysis Procedure for the Flexible Risers in Subjected to Combined Loading Effects 14th

A Simplified Nonlinear Analysis Procedure for the Flexible R...

引用

14th International Symposium on Practical Design of Ships and Other Floating Structures, PRADS 2019

作者： Kim, Jeong Du Jang, Beom-Seon Department of Naval Architecture and Ocean Engineering Seoul National University Seoul Korea Republic of Research Institute of Marine System Engineering Department of Naval Architecture and Ocean Engineering Seoul National University Seoul Korea Republic of

ISBN: (纸本)9789811546792

A dynamic analysis of flexible risers in large-scale domain remains the offshore industrys most challenging problems. The cross section of flexible risers, consisting of multiple metallic and plastic layers, experiences inter-layer slippage during cyclic bending. This results in nonlinear and hysteretic bending behavior with rapid dissipation of energy. For the dynamic analysis for flexible risers in the large scale domain, this study replaces all layers of risers with simple beam elements with a nonlinear beam model. This simplified beam model traces the curvature to bending moment relation and captures the variation of stiffness due to the onset of slippage. The suggested methods formulate both the change of configuration due to large deflection and contact between risers and seabed, therefore more realistic and effective analysis can be achieved. In the current study, the details of the analysis method are described. Main formulation methods of the total Lagrangian framework and the interaction between risers and seabed are described as well as the nonlinear bending model for flexible risers. The validity of the developed method is examined through some case studies, and the results show how the bending nonlinearity of flexible risers affects the overall behavior of riser systems during its operation. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Stiffness

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A fundamental study on the ship handling simulation of tug-barge and pusher-barge systems for river service

A fundamental study on the ship handling simulation of tug-b...

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International Conference on Ship and Offshore Technology, ICSOT India 2015

作者： Sano, Masaaki Hasegawa, Kazuhiko Department of transportation and environmental system Hiroshima University Japan Department of naval architecture and Ocean engineering Osaka University Japan

ISBN: (纸本)9781510822962

Mahakam River in Indonesia has been famous for coal transport by tug-barge system (TBS) and many ships come and go in the narrow waterway. Since the number of ships is predicted to increase as the coal mining becomes more active, there is a big concern about the navigation safety in the heavier traffic situation in near future. Pusher-barge system (PBS) which has better maneuverability and easier handling rather than TBS is worthy of consideration as an alternative transport way. This mean of transport would be more suitable for the serpentine and congested river and the smoother and safer traffic flow could be expected. This study s still in the first stage. In this paper, assuming TBS and PBS sailing aS-shaped bend in Mahakam River, the maneuvering motions and handling techniques of them are discussed. Meeting and overtaking simulations are also run to investigate the behavior of collision avoidance of each system. Authors aim to make a fundamental study on the difference of the navigation state by the different way of transport. © 2015: The Royal Institution of naval Architects.

关键词： Barges

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Modeling for impact sound insulation of raised access floors

Modeling for impact sound insulation of raised access floors

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40th International Congress and Exposition on Noise Control engineering 2011, INTER-NOISE 2011

作者： Cheng, Chieh-Yuan Wang, Wei-Hui Liou, Der-Yuan HanSound Technology Inc. Taiwan National Taiwan Ocean University Department of System Engineering and Naval Architecture Taiwan

ISBN: (纸本)9781618392800

The prediction model of the impact noise insulation by using the experimental modal analysis(EMA) and the transfer mobility theory together with the four-pole parameter method is established in this paper. The raised floors can be decomposed into a number of resilient units arranged in series. The transfer mobility function from the force input end to the sound receiving end can be characterized by the mobility function of individual resilient unit. Thus, it is possible to utilize this model for selecting appropriate resilient units to reach the required FIIC at an early stage. An design application example of FIIC 72 raised floor is also illustrated and discussed.

关键词： Floors

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Broadband noise prediction of a pump-jet propeller for submarine using wall pressure spectrum 24

Broadband noise prediction of a pump-jet propeller for subma...

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24th International Congress on Acoustics, ICA 2022

作者： Kim, Min-Hyeok Hong, Suk-Yoon Song, Jee-Hun Park, Il-Ryong Kim, Min-Jae Department of Naval Architecture and Ocean Engineering Seoul National University Korea Republic of Institute of Engineering Research Seoul National University Korea Republic of Department of Naval Architecture and Ocean Engineering Chonnam National University Korea Republic of Department of Naval Architecture and Ocean Engineering Dongeui University Korea Republic of Naval System R&D Institute Agency for Defense Development Korea Republic of

Since submarines generally operate in non-cavitating conditions and the use of a Pump-Jet Propeller (PJP) instead of a conventional single propeller can decrease tone noises, contributions of mid-to-high frequency broadband noise to radiation noise become significant. PJP consists of a decelerating duct, a fixed stator adjusting flow direction, and a rotating rotor generating flows. In this paper, broadband noise from trailing edges was analyzed to predict the radiation noise at multiple observation points, and the contribution of each component was compared. Since noise sources up to high frequency are obtained from small eddies in turbulent boundary layers, Wall Pressure Spectrum (WPS) was used with input data given by Computational Fluid Dynamics (CFD) simulation with Reynolds-averaged Navier-Stokes(RANS) turbulence model. Thin airfoil theory was used to predict distributions of acoustic pressure on blades. Noise radiation from trailing edges to far-field observation points was calculated by applying duct green's function through PJP and free-field green's function after its exit. By comparing the contribution, it can be identified which parts need to be redesigned to reduce the noise, and decreasing the radiation noise in all directions can be achieved. © ICA *** rights reserved

关键词： Broadband noise Pump-jet propeller Wall pressure spectrum

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Simulation-based performances analysis for naval ships at the initial design stage 26

Simulation-based performances analysis for naval ships at th...

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26th Annual International Ocean and Polar engineering Conference, ISOPE 2016

作者： Jeong, Dong-Hoon Roh, Myung-Il Ham, Seung-Ho Choi, Woo-Young Lee, Chan-Young Seo, Kyung-Min Lee, Dong-Chul Department of Naval Architecture and Ocean 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 Naval System R and D Department Daewoo Shipbuilding and Marine Engineering Seoul Korea Republic of

ISBN: (纸本)9781880653883

The design and the construction of naval ships take a very long time and a huge cost. Therefore, simulation-based performance analysis for naval ships can be useful. In this study, a simulation framework is proposed to simulate the performance of the naval ships at the initial design stage. The simulation framework consists of three components: virtual battlefield, combat object models, and space model. It is applied to predict and analyze the maneuver performance and the detection performance of the naval ships. © Copyright 2016 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Vehicle performance

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New concept of solar- Powered catamaran fishing vessel 7

New concept of solar- Powered catamaran fishing vessel

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7th International Conference on Asian and Pacific Coasts, APAC 2013

作者： Utama, I.K.A.P. Santosa, P.I. Chao, R.-M. Nasiruddin, A. Department of Naval Architecture and Shipbuilding Engineering ITS Surabaya60111 Indonesia Department of Mechatronics and Marine System Engineering National Cheng Kung University Tainan Taiwan

ISBN: (纸本)9789795301257

It has been considered that the availability of fossil fuels is getting rare and hence becoming more expensive. Its exploration has moved from onshore to offshore together with advanced technology involved thus causing higher cost to the fuels to be ready to use. This fact has caused (in particulars) the fishermen cannot afford to buy the fuel so that they are vulnerable to live in poverty. Recent survey shows that more than 50% of fishing boats, owned by traditional and low economic income of Indonesian fishermen, has been grounded. In addition, the use of fossil fuels has caused the increase of green house gas (GHG) effects thus its continuous use is not environmentally friendly. The current paper describes the development of catamaran fishing vessel as a part of academic contribution to help the Indonesian fishermen. Earlier work proposed the design of catamaran fishing (cat-fish) vessel using the conventional diesel engine, whilst the new design introduces the use of combination of diesel engine together with the use of solar power. Discussion includes the explanation of lay out arrangement, ship stability and seakeeping characteristics, and energy index due to the use of two power system. The later item has now become a serious matter under IMO (International Maritime Organization) regulation in order to reduce GHG effect. Economic review of the possible development of the novel concept is also taken into consideration because the investment cost of the solar powered boat is predicted to be more expensive than the diesel powered vessel but its operational cost is cheaper hence it is promising in long-term use. © APAC *** rights reserved.

关键词： Greenhouse gases

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The chamber design of the L-shaped oscillating water column using artificial neural network 15th

The chamber design of the L-shaped oscillating water column ...

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15th European Wave and Tidal Energy Conference, EWTEC 2023

作者： Lin, C.-C. Chow, Y.-C. Nguyen, D.T. Department of mechanical and mechatronic engineering and Center for Ocean Energy System National Taiwan Ocean University Keelung202301 Taiwan Department of systems engineering and naval architecture and Center for Ocean Energy System National Taiwan Ocean University Keelung202301 Taiwan Department of systems engineering and naval architecture National Taiwan Ocean University Keelung202301 Taiwan

Among the various wave energy converters available, the oscillating water column (OWC) shows several advantages in implementation and maintenance. In dealing with the survivability issues, incorporating OWCs into reinforced concrete constructions, like breakwaters, is more cost-effective and can endure the effects of seawater impact and erosion. This paper focuses on optimizing the chamber design of a novel OWC type, the L-shaped OWC, by establishing a general design procedure to achieve higher power-capturing efficiency. The performance of the OWC is influenced significantly by the OWC’s geometry under a specified wave condition. It is found that the dimension of the air chamber and water duct is critical in determining OWC’s performance. We develop the chamber design procedure based on the artificial neural network approach by establishing a collection of two-dimensional RANS simulations as the training database. In the end, the performance of the optimal design is compared with the design of a previous paper. The result shows that the capture factor of the present optimized chamber geometry of the L-shaped OWC is 60% more than a former design. © 2023 European Wave and Tidal Energy Conference. This paper has been subjected to single-blind peer review.

关键词： Tidal power

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Development of reliability-centered maintenance system for equipment of FLNG 27

Development of reliability-centered maintenance system for e...

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27th International Ocean and Polar engineering Conference, ISOPE 2017

作者： Yoo, Seung-Yeol Lee, Su-Bong Lee, Soon-Sup Department of System Engineering Graduate School Gyeongsang National University Tongyoung Korea Republic of Department of Naval Architecture and Ocean Engineering Gyeongsang National University Tongyeong Korea Republic of

ISBN: (纸本)9781880653975

The main cause of offshore platform accidents is the breakdown of topside equipment. CBM (Condition Based Maintenance) predicts the operational lifetime of an equipment and the maintenance frequency. It helps the user to avoid accidents and the associated unplanned downtime, by providing an early warning of deterioration before a failure. Recently, CBM research is being carried out to maintain individual pieces of equipment. In FLNG (Floating Liquid Natural Gas), however, the topside processes are modularized with four systems. It is more efficient to focus on the maintenance of the modularized systems. In this paper, a reliability-centered maintenance system is developed for the FLNG topside equipment. The developed methodology begins with analyzing the process systems and identifying target systems. And then, the targets are analyzed by using the SRA (system Reliability Analysis) technique to assess associated risks. Finally, a system for optimized maintenance plans can be developed. Copyright © 2017 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Risk assessment

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Experimental and numerical investigation of ship-ice interactions in pack ice 24

Experimental and numerical investigation of ship-ice interac...

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24th International Conference on Port and Ocean engineering under Arctic Conditions, POAC 2017

作者： Kim, Hyoil Im, Namkyun Sawamura, Junji Department of Naval Architecture and Ocean Engineering Osaka University Japan Division of Marine Transportation System Mokpo Maritime University Jeonnam Korea Republic of

Ship-ice interaction in pack ice is important issue for safe ship operation in ice-covered water. This paper presents an investigation of ship-ice interaction when an ice-going ship turns and moves straight in pack ice. Free-running model tests were conducted to elucidate ship-ice interaction in pack ice. A 1/100 scale ship model and disk-shaped synthetic ice floes were used in a free-running model test. The model ship, propelled with a constant engine RPM at full loading condition, had a GPS and a motion sensor installed onboard to measure the ship's trajectory and motion. Ice removal was measured using a vision inspection technique. In free-running tests, the model ship passed through pack ice of three ice concentrations (10%, 20%, and 30%) with no rudder action. In turning circle tests, the model ship passed through pack ice with 7.2% ice concentration. The authors proposed a numerical model to calculate ice loads and ship motions in pack ice based on Discrete Element Method. To validate the numerical model, ship motions and ice removal in the model tests were compared with the simulations. Numerical results showed good agreement with experimental test results. The effects of ice concentration on ship-ice interactions were investigated experimentally and numerically.

关键词： Numerical methods

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Determination of the optimal operating condition of the dual mixed refrigerant cycle at the pre-FEED stage of the LNG FPSO topside liquefaction process

Determination of the optimal operating condition of the dual...

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作者： Lee, Kyu-Yeul Cha, Ju-Hwan Lee, Joon-Chae Roh, Myung-Il Hwang, Ji-Hyun Department of Naval Architecture and Ocean Engineering Seoul National University Seoul Korea Republic of Department of Ocean System Engineering Mokpo National University Mokpo Korea Republic of School of Naval Architecture and Ocean Engineering University of Ulsan Seoul Korea Republic of

ISBN: (纸本)9781880653968

The dual mixed refrigerant (DMR) cycle, which pre-cools natural gas with the mixed refrigerants and then liquefies the natural gas with another set of mixed refrigerants, is well known for having the highest efficiency among the liquefaction cycles. Its possible application to LNG FPSO is also extensively investigated. In this study, the optimal operating conditions, such as the equipment's flow rate, pressure, temperature, and refrigerant composition per flow of the DMR cycle, were determined in consideration of power efficiency. To determine the optimal operating conditions, a mathematical model was formulated based on the mathematical model of the single mixed refrigerant (SMR) cycle with additional consideration of tees, phase separators, and common headers. In the mathematical model, the 227 operating conditions were defined as unknowns and 196 equality constraints related to the thermodynamics for the equipment were formulated. Further, the 15 given variables related to the natural gas, compressor efficiency and seawater coolers were used. This mathematical model can be regarded as the optimization problem, in which the number of unknowns is larger than the total number of equality constraints and given variables. To obtain the optimal operating conditions, the minimization of the required power for the compressors at the cycle was defined as an objective function. Moreover, set as design variables were the 16 operating conditions, such as flow rate, pressure, temperature and composition of the main and precooling refrigerant, natural gas temperature after precooling, and flow rate ratio for the tee. In addition, the temperature conditions for the equipment's operation were used as inequality constraints. The optimal operating conditions were then obtained by using a hybrid optimization method that consists of the genetic algorithm (GA) and sequential quadratic programming (SQP). The calculation results show that the required power at the obtained conditions w

关键词： Refrigerants

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