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16th International Conference on Fracture and Damage Mechanics, 2017

作者： Prabowo, Aditya Rio Sohn, Jung Min Byeon, Jung Hoon Bae, Dong Myung Zakki, Ahmad Fauzan Cao, Bo Interdisciplinary Program of Marine Convergence Design Pukyong National University Busan48513 Korea Republic of Department of Naval Architecture and Marine Systems Engineering Pukyong National University Busan48513 Korea Republic of Department of Naval Architecture Diponegoro University Semarang50268 Indonesia China Shipbuilding Industry Corporation Economic Research Center Beijing100012 China

ISBN: (纸本)9783035711684

Demand to increase safety for water transportation, namely ship is continuously rising as various accidental loads may threat condition of target structure, i.e. ship. Several possibilities of impact scenario can occur with various indenters, for example stranding to a grounded ice. In this work, a study of structural behaviour accounting for interaction between the ship structure and indenter is conducted. Numerical simulation is performed using finite element method to estimate damage extent of the double bottom. In analysis, the indenter for grounding scenario is applied by characteristic of the ice properties to obtain estimated response of the structure in experiencing impact on polar territory. Impact scenario is defined into three different locations, namely girder and space between two girders. Finally, tendency of the damage per destroyed component is summarized. © 2017 Trans Tech Publications, Switzerland.

关键词： Ice

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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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Gas Dispersion Analysis on the Open Deck Fuel Storage Configuration of the LNG-Fueled Ship 1

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

作者： Nubli, Haris Prabowo, Aditya Rio Sohn, Jung Min Interdisciplinary Program of Marine Convergence Design Pukyong National University Busan48513 Korea Republic of Department of Mechanical Engineering Universitas Sebelas Maret Surakarta57126 Indonesia Department of Naval Architecture and Marine System Engineering Pukyong National University Busan48513 Korea Republic of

ISBN: (数字)9789811544811

ISBN: (纸本)9789811544804

The LNG (Liquefied Natural Gas) fueled ship is one of the solution to solve the emission of SOx and NOx in conventional maritime fuel. Despite the advantages, the LNG fuel is more dangerous due to their low flash point. The leakage of gas fuel is one of the threat of LNG-fueled vessel, due to its explosive characteristic. This study aims to establish the exclusion zone due to LNG dispersion. The analysis contained the potential leakage and gas dispersion along to the exposed area. A verified Computational Fluid Dynamics (CFD) analysis based on the time accuracy assumption using KFX software was performed to simulate the dynamic behavior of the vapor dispersion. The scenarios were categorized by the leak size, leak location, and mass flow rate. The required environment parameters, e.g., wind speed and wind directions were also considered. It is found that the behavior of dispersed vapor was strongly depending on the leak location and mass flow rate. Surprisingly, the environment parameter has slightly affected the distance of the vapor dispersion. According to these findings, to deliver risk mitigation in a gas leakage accident, the exclusion zone was provided. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Computational fluid dynamics Exclusion zone Gas dispersion analysis LNG-fueled ship

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Detection and Segmentation of Underwater Archaeological Sites Surveyed with Stereo-Vision Platforms

Detection and Segmentation of Underwater Archaeological Site...

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Oceans MTS/IEEE Washington (Conference)

作者： Katherine A. Skinner Matthew Johnson-Roberson Robotics Program University of Michigan Department of Naval Architecture and Marine Engineering University of Michigan

ISBN: (纸本)9781467393744

This paper proposes a method for automating detection and segmentation of archaeological structures in underwater environments. Underwater archaeologists have recently taken advantage of robotic or diver-operated stereo-vision platforms to survey and map submerged archaeological sites. From the acquired stereo images, 3D reconstruction can be performed to produce high-resolution photo-mosaic maps that are metrically accurate and contain information about depth. Archaeologists can then use these maps to manually outline or sketch features of interest, such as building plans of a submerged city. These features often contain large rocks that serve as the foundation to buildings and are arranged in patterns and geometric shapes that are characteristic of human-made structures. Our proposed method first detects these large rocks based on texture and depth information. Next, we exploit the characteristic geometry of human-made structures to identify foundation rocks arranged along lines to form walls. Then we propose to optimize the outlines of these walls by using the gradient of depth to seek the local minimum of the height from the seafloor to identify the ground plane at the base of the rocks. Finally, we output contours as geo-referenced layers for geographic information system (GIS) and architectural planning software. Experiments are based on a 2010 stereo reconstruction survey of Pavlopetri, a submerged city off the coast of Greece. The results provide a proof-of-concept for automating extraction of archaeological structure in underwater environments to produce geo-referenced contours for further analysis by underwater archaeologists.

关键词： Rocks Image segmentation Image reconstruction Dictionaries Training Three-dimensional displays Buildings

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Using simulation to determine the maneuvering performance of the WAGB-20

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naval ENGINEERS JOURNAL 1998年第1期110卷 171-188页

作者： Lecourt, EJ E.J. Lecourt Jr. is a graduate of the USCG Academy. Received MS degrees from MIT in Electrical Engineering and Naval Architecture and Marine Engineering. Currently Program Manager at PDI Division of Bird-Johnson Companey. Forty years experience in research design analysis and testing of marine engineering systems with perarticular emphasis on electric propulsion systems. While in the USCG served two years aboard a turbo-electric ship and two years aboard a diesel-electric ship. Member ASNE and SNAME.

The WAGB-20 is a U. S. Coast Guard polar icebreaker with an integrated diesel-electric propulsion system. Power is generated by four main diesel engines driving AC generators. Two main 15,000-HP AC synchronous propulsion motors are directly coupled to the port and starboard propellers. Two cycloconverters provide variable-voltage, variable-frequency power for controlling each propulsion motor. The simulation of the electric propulsion system is being developed to analyze the steady-state and transient performance of the system during open water and icebreaking operations. The objectives of the analysis are to support propulsion plant design, aid in the integration of system components, develop control system algorithms, predict system performance, and determine the requirements for dynamic braking resistors. The analysis consists of mathematical models for the ship, shaft systems, propellers, AC synchronous propulsion motors, motor controllers, cycloconverters, generators, generator exciters, voltage regulators, diesel engines, and engine governors. These models are based on actual machinery data. The WAGB-20 specification requires the propulsion system to have the capability of going from full power ahead to full power astern in open water in 25 seconds or less. This paper presents the simulation results which show that by controlling the regenerative power the crash astern maneuver can be performed to meet this requirement without the need for dynamic braking resistors.

关键词： Icebreakers

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The Effect of Air Cavity on Water Resistance of a High-Speed Ferry with a Several-Stepped Hull 33rd

The Effect of Air Cavity on Water Resistance of a High-Speed...

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33rd International Ocean and Polar engineering Conference, ISOPE 2023

作者： Anggriani, Andi Dian Eka Mutsuda, Hidemi Nakashima, Takuji Ardianti, Andi Baso, Suandar Transportation and Environmental System Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima-shi Higashihiroshima Japan Transportation and Environmental Systems Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima-shi Higashihiroshima Japan Naval Architecture Study Program Hasanuddin University South Sulawesi Gowa Indonesia

ISBN: (纸本)9781880653807

A planing hull high-speed ferry with a stepped hull becomes a well-liked mode of water transportation for archipelago countries. On the other hand, the shape of steps on the bottom hull has not been recently taken into explicit consideration regarding the speed requirement and hydrodynamic properties. In this study, the step W shapes, were adopted to find the improved hydrodynamic performance in the planing conditions. To provide a more precise prediction of the pressure, velocity fields, and void fraction, the CFD was applied the Finite Volume Method (FVM) and coupled with Volume of Fluid Method (VOF) to capture air cavity The numerical conditions of the planing hull were trimmed by the stern with 2, and 3 degrees. This study discussed the air cavity that occurred behind the stepped area that can affect the hydrodynamic behaviour. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Finite volume method

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Low cost underwater acoustic localization 173

Low cost underwater acoustic localization

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173rd Meeting of Acoustical Society of America, Acoustics 2017 and 8th Forum Acusticum

作者： Ruland, Eduardo Alexander Iscar Shree, Atulya Goumas, Nicholas Johnson-Roberson, Matthew Naval Architecture and Marine Engineering University of Michigan Ann ArborMI48109 United States Robotics Program University of Michigan Ann ArborMI48109 United States University of Michigan Ann ArborMI48109 United States

Over the course of the last decade, the cost of marine robotic platforms has significantly decreased. In part this has lowered the barriers to entry of exploring and monitoring larger areas of the earth's oceans. However, these advances have been mostly focused on autonomous surface vehicles (ASVs) or shallow water autonomous underwater vehicles (AUVs). One of the main drivers for high cost in the deep water domain is the challenge of localizing such vehicles using acoustics. A low cost one-way travel time underwater ranging system is proposed to assist in localizing deep water submersibles. The system consists of location aware anchor buoys at the surface and underwater nodes. This paper presents a comparison of methods together with details on the physical implementation to allow its integration into a deep sea micro AUV currently in development. Additional simulation results show error reductions by a factor of three. © 2018 Acoustical Society of America.

关键词： Travel time

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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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The road to Impeccable -: An uncommon approach to ship acquisition

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naval ENGINEERS JOURNAL 1999年第3期111卷 245-255页

作者： Shen, TWT Proctor, BL Saha, D Mr. Terry Shen:is the Assistant Project Manager for the Ocean Surveillance Ship (T-AGOS 23) Acquisition Project at Naval Sea Systems Command (NAVSEA). He is responsible for the program management of the large SWATH (Small Waterplane Area Twin Hull) ship construction in the Gulf region. Mr. Shen has over 14 years of experience in ship acquisitions and has co-authored several technical papers published by the Association of Scientists & Engineers the Society of Naval Architects & Marine Engineers and the American Society of Naval Engineers. He is a graduate of the University of Maryland with a BS in aerospace engineering and a BA in speech communication a 1986 graduate of the DSMC Program Management Course and a 1991 graduate of the Virginia Polytechnic Institute with an MBA in business administration. Mr. Barry Proctor:is NAVSEA's Ship Design Manager for the T-AGOS 23 program. He has held this position since March 1997. Prior to that time he was NAVSEA's Ship Design Manager for the T -AKR 300 class vessels. He has over 18 years of experience as a Naval Architect for NAVSEA (O3D). He has a BS in civil engineering from the University of Maryland and an MS in naval architecture and marine engineering from the University of Michigan. Mr. Deepak Saha:provides design support to NAVSEA's Program Office and Ship Design Manager on the T -AGOS 23 ship acquisition. His involvement with the program started at the time the first shipbuilder declared bankruptcy. He is Manager of the Commercial Ship Design Group at M. Rosenblatt & Son Inc. (MR&S) Arlington Branch. He has over 26 years of experience as a marine engineer and naval architect. He obtained a BS in marine engineering from Calcutta India in 1972 and a BSE in naval architecture from the University of Michigan in 1983. He also holds a Chief Engineer's License (Unlimited Horsepower Diesels).

The road to the acquisition of the USNS Impeccable (T-AGOS 23) has seen a few uncommon and challenging twists and turns, resulting in delays and disruption to the program. The saga began in 1993, when the original shipbuilder, facing financial difficulties, filed for Chapter XI bankruptcy protection. For two more years the program was stalled before the Navy was able to warrant the work that had been done up to that point. In 1995 the contract was reassigned to another shipbuilder to complete the vessel and obtain the necessary certificates to comply with all the applicable requirements of the American Bureau of Shipping (ABS). This unprecedented approach put the Navy in the unique situation of being responsible for two of the most controversial issues in a ship construction process, i.e., detail design and equipment warranties. This paper gives the status of the program, discusses how various technical issues and production demands are being addressed, and describes the future hurdles that need to be overcome before delivery of the vessel.

关键词： Ships SPT/ADA/Gcn5 Acetyltransferase Road Navy Shipyards

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A NEW GENERATION OF HIGH-PERFORMANCE PLANING CRAFT

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naval ENGINEERS JOURNAL 1985年第4期97卷 234-247页

作者： JONS, OP KOELBEL, J SHELDON, R Otto Jons:is vice president of engineering at Advanced Marine Enterprises Inc. He received a Diplom Ing. from the Technical University of Hannover W. Germany and an M.S. in naval architecture and marine engineering from the Massachusetts Institute of Technology in 1976. He then joined Litton Ship Systems to work on the DD-963 and LHA programs. He was principal research scientist at Hydronautics and technical director with Designers and Planners before forming in 1976 together with S. Glatz and J. Drewry Advanced Marine where he is responsible for engineering and technical matters on behalf of the corporation. Joseph Koelbel: a senior naval architect at Advanced Marine Enterprises Inc. has for many years specialized in the design of high-speed rough-water boats including a record-setting race boat passenger boats and patrol boats such as the CPIC and the PBM. He received special recognition for his contributions to and editing of the Planing Concept Volume of the Advanced Naval Vehicles Concept Evaluation Study. He is a member of ASNE SNAME (past chairman planing boats panel of the Hydrodynamics Committee) and ABYC. He is the author of a number of published papers on small-craft design. Ray Sheldon:is the head of computer applications at Advanced Marine Enterprises Inc. where he directs activities in computer-aided ship design software development and ship performance prediction. Previously at the Hydronautics Ship Model Basin he was involved in nearly all aspects of ship hydrodynamics and the development and refinement of test methodologies and equipment. Mr. Sheldon is a 1973 graduate of Webb Institute of Naval Architecture (B.S. naval architecture and marine engineering) a member of ASNE and an associate member of SNAME. He is the author of several published papers concerning ship design and experimental methods.

Key aspects of the design development of a capable yet affordable high performance craft are addressed. These aspects include the development of mission requirements, the rationale for major design decisions, performance capabilities, and system and subsystem selection. The superior performance of the design, as demonstrated by an extensive model test program, led to the decision to develop a family of advanced fast patrol boat concepts. Selected family members are also briefly introduced. The paper, furthermore, demonstrates the successful integration of many major computer-aided design (CAD) programs currently in use for U.S. Navy ship design.

关键词： naval VESSELS

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