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Resistance Analysis of a Semi-SWATH Design Concept in Shallow Water

Journal of Marine Science and Application 2017年第2期16卷 182-189页

作者： Arifah Ali Adi Maimun Yasser M. Ahmed Rahimuddin Marine Technology Center Department of Aeronautics Automotive & Ocean Engineering Universiti Teknologi MalaysiaSkudai 81310 UTM Malaysia Department of Naval Architecture and Marine Engineering Faculty of Engineering Alexandria University Alexandria 21526 Egypt Program Studi Teknik Sistem Perkapalan Universitas Hasanuddin Makassar 90245 Indonesia

Resistance analysis is an important analytical method used to evaluate the hydrodynamic performance of High Speed Craft (HSC). Analysis of multihull resistance in shallow water is essential to the performance evaluation of any type of HSC. Ships operating in shallow water experience increases in resistance because of changes in pressure distribution and wave pattern. In this paper, the shallow water performance of an HSC design concept, the semi-Small Waterplane Area Twin Hull (semi-SWATH) form, is studied. The hull is installed with fin stabilizers to reduce dynamic motion effects, and the resistance components of the hull, hull trim condition, and maximum wave amplitude around the hull are determined via calm water resistance tests in shallow water. These criteria are important in analyzing semi-SWATH resistance in shallow water and its relation to flow around hull. The fore fin angle is fixed to zero degrees, while the aft fin angle is varied to 0o, 5o, 10o, and 15o. For each configuration, investigations are conducted with depth Froude numbers (FrH) ranging from 0.65 to 1.2, and the resistance tests are performed in shallow water at the towing tank of UTM. Analysis results indicate that the resistance, wave pattern, and trim of the semi-SWATH hull form are affected by the fin angle. The resistance is amplified whereas the trim and sinkage are reduced as the fin angle increases. Increases in fin angle contribute to seakeeping and stability but affect the hull resistance of HSCs.

关键词： resistance wave height semi-SWATH shallow water fin stabilizers

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Dynamic response control of a jacket platform using MR dampers based on an inverse dynamic model

Dynamic response control of a jacket platform using MR dampe...

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作者： Yu, Xiaochuan Kang, Hooi-Siang Huang, Liqing Xie, Yonghe Zhai, Qiang Chen, Guojian Ocean Engineering Program Department of Civil Engineering Texas A and M University College Station TX United States School of Naval Architecture and Civil Engineering Zhejiang Ocean University Zhoushan Zhejiang China Department of Mechanical Engineering University of Wisconsin Milwaukee Milwaukee WI United States School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781880653968

The magnetorheological (MR) dampers have been used to reduce the vibration in truck seats in the auto industry, to minimize the damage to civil engineering structures due to seismic loads, and etc. Recently some researchers introduce MR dampers into the offshore industry, mainly focusing on the dynamic response control of jacket platforms and its potential application in the riser system of floating offshore platforms. In this paper, a newly proposed inverse dynamic model of MR dampers is initially applied to a one-story building under the El-Centro earthquake. This model can be employed to predict the voltage/current of MR dampers to track the optimal/desired damping force by the Linear Quadratic Regulator (LQR) method. Different weighting factors (Q, R) for LQR method are selected to study MR damper's performance, assuming that the structures are exposed to various earthquake loads. Further, the dynamic response control of a jacket platform using the 20-ton large-scale MR dampers is also investigated. Both the earthquake loads and ice loads are considered. The inversely identified evolutionary variables are estimated to study the hysteretic behavior of MR fluids. Overall, MR damper can mitigate the dynamic responses of this platform to a considerable degree when it undergoes strong excitations. Copyright © 2011 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Dynamic response

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Safety of caisson transport on a floating dock

Safety of caisson transport on a floating dock

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作者： Kang, H.Y. Kim, M.H. Seok, J. Park, J.C. Kang, Y.K. Ocean Engineering Program Dept. of Civil Engineering Texas A and M University College Station TX United States Dept. of Naval Architecture and Ocean Engineering Pusan National University Busan Korea Republic of Civil Engineering Team Samsung C and T Corporation Seoul Korea Republic of

ISBN: (纸本)9781880653968

When caissons are mounted on a floating transportation barge and towed by a tug boat in waves, the motion of the floating dock creates inertia-gravity induced slip force on the caisson. If its magnitude exceeds the corresponding friction force between the two surfaces, a slip may occur, which can lead to an unwanted accident. In oblique waves, both pitch and roll motions occur simultaneously and their coupling effects for separation and friction forces become more complicated. With the presence of strong winds, the separation force can significantly be increased to make the situation worse. In this regard, the safety of the transportation process of a caisson mounted on a floating dock for various wind-wave conditions is investigated. The analysis is done by both frequency-domain approach and time-domain approach and their differences as well as pros-cons are discussed. It is seen that the time-domain approach is more direct and accurate and can include nonlinear contributions and viscous effects, which are typically neglected in the linear frequency-domain approach. Copyright © 2011 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Time domain analysis

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Numerical predictions of hydrofoil sheet cavitation noise using CFD analysis

Numerical predictions of hydrofoil sheet cavitation noise us...

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39th International Congress on Noise Control engineering 2010, INTER-NOISE 2010

作者： Kim, Jong-Do Hong, Suk-Yoon Rhee, Shin-Hyung Lee, Hee-Bum Song, Jee-Hun Department of Naval Architecture and Ocean Engineering Seoul National University Seoul 151-742 Korea Republic of Program of Naval Architecture and Ocean Engineering College of Marine Technology Chonnam National University 386 Mipyeongro Yeosu Chonnam 550-749 Korea Republic of

ISBN: (纸本)9781617823961

Underwater radiated noises from marine vehicles are mostly due to the propulsion systems. Recently, the propeller noise problems are becoming crucial issues in terms of habitability of passenger ships. Especially in military area, propeller noise is directly related to thesurvivability of submarines and warships, and thus propeller noise analysis and reductions are very important. Generally, propeller noise can be classified into non-cavitation noise and cavitation noise which is dominant. In this paper, analysis of sheet cavitation noise of hydrofoil is studied as a beginning work for the propeller cavitation noise study using Computational Fluid Dynamics (CFD), and theory and numerical method are presented. Theflow field is analyzed with the Fluent system, and time dependent sheet cavitation noise is simulated assuming volume variation of cavitation as moving monopole.

关键词： Computational fluid dynamics

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Hydrodynamic interactions between container ship and mobile harbor with spm-buoy station

Hydrodynamic interactions between container ship and mobile ...

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20th International Offshore and Polar engineering Conference, ISOPE-2010

作者： Kim, M.H. Kang, H.Y. Bae, Y.H. Kim, Y.B. Ocean Engineering Program Dept. of Civil Engineering Texas AandM University College Station TX United States Dept. of Naval Architecture Ocean and IT Engineering KyungNam University Masan Korea Republic of

ISBN: (纸本)9781880653777

As the size of container ships increases, not many existing harbors can host the super-container ship with its increased draft, and the continual effort of dredging requires huge budget. In addition, the minimization of waiting and offloading time is the most important factor in harbor competitiveness in this kind of global economy. In this regard, mobileharbor concept has been developed in Korea to effectively solve the problem. In developing the concept, one of the most important elements is the operability of crane between two large floating bodies in side-byside arrangement. The container ship is to be stationed through hawser lines to a SPM (Single-Point Mooring) buoy station at an offshore site with the depth allowing its large draft. The mobile harbors with cranes are berthed to the side of its hull for container loading/offloading and transportation. The relative motions between the two floating bodies with proper hawser connection have to be within allowable range for the crane operability. Therefore, the reliable prediction of the relative motions of the three floating bodies with hawser/mooring is essential for the safe and cost-effective design of such a system. Time-domain multi-hull-mooring coupled dynamic analysis program is used to assess the global performance of the moored system and hydrodynamic interactions among the three floating bodies. Copyright © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).

关键词： Cost effectiveness

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Development of product model management system for naval shipbuilding

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Journal of Ship Production 2008年第2期24卷 82-91页

作者： Oh, Dae Kyun Jeong, Yeon Hwan Kim, Yong Gyun Shin, Jong Gye Yeo, Yong Hwan Ryu, Cheolho Department of Naval Architecture and Ocean Engineering Seoul National University Seoul Korea Republic of LTCD Republic of Korea Navy Jinhae Korea Republic of Xinnos Co. Seoul Korea Republic of Research Institute of Marine Systems Engineering Department of Naval Architecture and Ocean Engineering Seoul National University Seoul Korea Republic of CDMR Korea Defense Acquisition Program Administration Office Republic of Korea Navy Seoul Korea Republic of Department of Naval Architecture and Ocean Engineering Inha University Incheon Korea Republic of

Since the concept of integrated product development environment (IPDE) was introduced from the US Department of Defense, the Korean navy has made efforts to apply the concept to its naval design and production. Recently, the Korean navy has supported a project for naval shipbuilding to achieve the advanced defense acquisition program. This project focuses on the integration of naval shipbuilding information. The Product Model Management System (PMMS) for Korean naval acquisition was a partial result of the project. The architecture of PMMS and the product structure of a naval ship are proposed in this paper. Also, the data acquisition process among acquisition program administration offices and contractors is defined for the construction of three-dimensional naval ship product models in PMMS. By constructing the product model on previous Korean naval ships, the PMMS was confirmed to a suitable innovative acquisition strategy. PMMS is on the leading edge of new product and process innovations in the Korean naval shipbuilding.

关键词： Product design

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A statistical analysis of engineering project risks in the Korean shipbuilding industry

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Journal of Ship Production 2007年第4期23卷 223-230页

作者： Lee, Eunchang Shin, Jong Gye Park, Yongtae Graduate Program in Technology and Management Seoul National University Seoul Korea Republic of Department of Naval Architecture and Ocean Engineering Seoul National University Seoul Korea Republic of Department of Industrial Engineering Seoul National University Seoul Korea Republic of

Risk management in shipbuilding projects is important in practice, but there have been few studies about risk assessment in the shipbuilding industry. The purpose of this study is to identify critical risks in shipbuilding projects and to examine the relationships among them, according to the ship production phases. A survey analysis was conducted with 248 experts from 10 major Korean shipbuilders in April 2007, and association rule mining was used as the research methodology. Twenty-six different risks are deduced. At the beginning stage of shipbuilding, it was discovered that design and financial risks were related, and human resource risks in ship design had relatively more influence but financial risks did not. At the block manufacturing stage, important risk factors were management of production equipment, supply of raw materials and labor, and quality management. Financial, technical, and managerial risks all had an important influence at this phase. At the erection stage, technical risks such as changes in design and managerial risks such as exceeding time and budget limits proved to be important. At the project finalization, phase risks were exchange rates, interest rates, timeline, fulfilling specifications, and natural disasters. The research results could be valuable for industrial participants to understand the shipbuilding risks in each construction stage.

关键词： Shipbuilding

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Offshore technology: Introduction

Proceedings of the International Conference on Offshore Mech...

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Proceedings of the International Conference on Offshore Mechanics and Arctic engineering - OMAE 2007年 1卷 1-2页

作者： Chakrabarti, Subrata Bernitsas, Michael M. Boote, Dario Brekke, James N. Chatjigeorgiou, Ioannis K. Chitrapu, Murthy Ertekin, R.C. Falzarano, Jeffrey M. Fernandes, Antonio C. Huang, Shan Kinoshita, T. Larsen, Carl Martin Leira, Bernt Mavrakos, Spyros A. Mekha, Basim B. Morrison, Denby Grey Moros, Thanos Myrhaug, Dag Niedzwecki, John M. Pesce, Celso Pupo Riggs, Ronald Ryu, Sam Schellin, Thomas E. Schofield, Paul J. Skourup, Jesper Song, Ruxin Suzuki, Hideyuki Teigen, Per Thiagarajan, Krish P. Zimmermann, Charles-Alexandre Dept of Naval Arch and Marine Eng. University of Michigan 2600 Draper Road Ann Arbor MI 48109-2145 United States Dipartimento di Ingegneria Navale e Tecnologie Marine University of Genoa Via Montallegro no.1 16145 Genova Italy Global Marine Development Corp. 777 N. Eldridge Parkway Houston TX 77079-4493 United States P.O. Box 4379 Houston TX 77210-4379 United States Offshore Structure Analysis Inc. 13613 Capista Drive Plainfield IL 60544-7966 United States National Technical University of Athens School of Naval Architecture and Marine Engineering Zografos Campus 9 Heroon Polytechniou Ave. GR15773 Athens Greece CSC/Advanced Marine Center 1201 M Street SE Washington DC 20003 United States Dept. of Ocean and Resources Engineering Univ. of Hawaii at Manoa Holmes Hall 402 2540 Dole St. Honolulu HI 96822 United States University of New Orleans School of Naval Architecture and Marine Engineering New Orleans LA 70148 United States COPPE/UFRJ Ocean Engineering Dept. Cidade Universitaria Centro de Tecnologia Bloco C - Caixa Postal 68508 21945-970 - Rio de Janeiro - RJ Brazil Department of Naval Architecture and Ocean Engineering University of Glasgow Glasgow G12 8QQ United Kingdom Institute of Industrial Science University of Tokyo 7-22-1 Roppongi Minato-Ku Tokyo 106 Japan 7491 Trondheim Norway 7491 Trondheim Norway School of Naval Architecture and Marine Engineering National Technical University of Athens 9 Heroon Polytechniou Ave. GR-157 73 Zografou Athens Hellas Greece INTEC Engineering Partnership Ltd. 15600 JFK Boulevard Houston TX 77032 United States Shell EP Projects Shell Woodcreek 200 N. Dairy Ashford Houston TX 77001-0576 United States BP Exploration Deep Water Projects 501 Westlake Park Blvd. Houston TX 77079 United States NTNU Marin Hydrodynamikk N-7034 Trondheim-NTH Norway 301 Wisenbaker Engineering Research Center Engineering Program Office Texas A and M University College Station TX 77843-3126 United States Department of

No abstract available

ISBN: (纸本)0791842673

No abstract available

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Experimental study on sloshing for large LNGC design

Experimental study on sloshing for large LNGC design

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15th International Offshore and Polar engineering Conference (ISOPE 2005)

作者： Lee, YB Sim, IH Kim, YS Jung, JH Park, JS Kwon, SH Jang, TS Daewoo Shipbuilding and Marine Engineering Co. Ltd. South Korea Naval Architecture and Ocean Eng. Dept. Pusan National University Busan South Korea Ocean Engineering Program Civil Engineering Department Texas A and M University United States

ISBN: (纸本)1880653648

This study presents results of an experimental study on three-dimensional sloshing phenomenon. The experimental facility used in this study was driven by six 15kw electric motors. The maximum load including dynamic load for this platform was estimated 4 tons. Six degrees of freedom of ship motion can be simulated with this platform. The 1/70 model of a 138,000 m3 LNG carrier was used to get the results. Single and coupled motion tests were carried out. The 17 pressure gauges were installed on the model. Each test was lasted for 5 minutes. The maximum pressure, mean pressure, the mean of 1/10 highest pressure, and the mean of 1/3 highest pressure for 17 locations were presented in this paper. The experimental results showed that this sloshing platform is very reliable to get the desired data for design of LNG carriers.

关键词： LNG tank sloshing

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Operating speed profiles and the ship design cycle

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naval ENGINEERS JOURNAL 2005年第3期117卷 79-85页

作者： Surko, S Osborne, M CDR. Stephen W. Surko USN (ret.) is serving as a principal member of the technical staff of Noesis Inc. He graduated with distinction from the United States Naval Academy in 1982 with a bachelor of science in ocean engineering. Serving as a division officer aboard USS Elliot (DD 967) he enjoyed two WESTPAC deployments and qualified as a surface warfare officer. He completed postgraduate studies at the Massachusetts Institute of Technology in 1988 receiving master of science degrees in naval architecture and marine engineering and mechanical engineering. He earned his professional engineer's license in 1989. Subsequent tours of duty have included: personnel exchange program with Canada's Directorate General Maritime Engineering and Maintenance Philadelphia Naval Shipyard Naval Surface Warfare Center Carderock Division Ship Systems Engineering Station Naval Sea Systems Command Chief of Naval Operations Land Attack Warfare Division and Naval Surface Warfare Center Carderock Division. Steve Surko is an active member of the U.S. Naval Institute and ASNE

One key, but little documented and empirically supported, input in the ship design cycle is the expected operating speed profile. This real-world constraint affects many decisions regarding bull form and power systems, from fuel tanks to main propulsion and ship's service machinery selection and operation. These decisions, in turn, ripple through the design of a ship in ways that are often bard to discern, but clearly impact acquisition and life cycle costs. Recent studies of DDG 51 operating speed profiles demonstrate that the Navy regularly operates with speed profiles considerably different than used to design the ship. In general, warships operate in standard engine order telegraph increments (e.g., Ahead 2/3) and at lower speeds than designed for.

关键词： Ships

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