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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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CRASHWORTHINESS ASSESSMENT OF THIN-WALLED BOTTOM STRUCTURES DURING POWERED-HARD GROUNDING ACCIDENTS 37

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37th ASME International Conference on Ocean, Offshore and Arctic Engineering

作者： Prabowo, Aditya Rio Sohn, Jung Min Bae, Dong Myung Setiyawan, Agus Pukyong Natl Univ Interdisciplinary Program Marine Convergence Desi Busan 48513 South Korea Pukyong Natl Univ Dept Naval Architecture & Marine Syst Engn Busan 48513 South Korea Univ Rhode Isl Dept Environm Sci & Management Kingston RI 02881 USA

ISBN: (纸本)9780791851333

Advance development in engineering and technology has been massively triggered by establishment of the free market memorandum between countries across the globe. Explicitly, this agreement affects ship and offshore industries, where stakeholder and investor demand a wide range of accidental damage assessment. Achievement of this objective is highly influenced by sustainable research on maritime accidents. Ship grounding is categorized in impact phenomena, and record has evidenced grounding as the most risky accident. Since it is capable to evoke massive losses, estimation of structural performance and limit under grounding is required. This work aims to evaluate crashworthiness of a thin-walled tanker structures in encountering ship grounding. A series of benchmark simulations based on pioneer experimental test is re performed as calibration of numerical configuration for grounding analysis. Several scenarios are designed in this stage by varying mesh sizes on the idealized test geometry. Preparation for the grounding analysis is presented in the next stage. Considering its characteristic as impact load, powered hard scenario is taken into account as the worst possible damage on the structures. It is assumed that grounding happens suddenly when the tanker is in a voyage and interacts with a hard object. A medium-carbon steel is embedded with the Det Norske Veritas - Germanischer Lloyd (DNVGL) fracture criterion. In this study, an oceanic obstruction is defined as seabed reef geometry with the properties are adopted based on data of ocean crustal seismology. Varieties of location, angle and elevation are applied to accidental grounding scenarios. The assessment of structural crashworthiness brings an insight into the effect sensitivity of the parameters on the double bottom behavior. Brief recommendation for grounding simulation is provided in final conclusion to give adequate references in applying numerical input and configuration, especially using the finite eleme

关键词： Accidents Crashworthiness

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Parametric Method using Grasshopper for Bulbous Bow Generation 1

Parametric Method using Grasshopper for Bulbous Bow Generati...

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1st IEEE International Conference on Computing, Electronics and Communications Engineering (iCCECE)

作者： Zhang, Yongxing Kim, Dong-Joon Bahatmaka, Aldias Pukyong Natl Univ Interdisciplinary Program Marine Convergence Desi Busan South Korea Pukyong Natl Univ Dept Naval Architecture & Marine Syst Engn Busan South Korea Pukyong Natl Univ BK21 Plus MADEC Human Resource Dev Grp Busan South Korea

ISBN: (纸本)9781538649046

Green ship technology is increasingly important in different areas of ship design. Hydrodynamic optimization shape design is an integral part of the overall fuel economy design. To get the optimal design, the geometry modification of ship takes extremely important place in an optimization loop. A conventional non-parametric approach has numerous disadvantages because the geometry is typically generated by low-level entities. In this study, a new bulbous bow modification method was developed for automatic generation and modification of a bulbous bow. A bulbous bow represented by the Non-Uniform Rational B-Spline (NURBS) surfaces. The generated bulbous bow can be automatically modified. In this study, Grasshopper is applied to generate and reconstruct a parametric bulbous bow. And attach the generated bulbous bow to a fixed hull automatically.

关键词： Parametric Design Grasshopper Bulbous Bow NURBS

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Structural Analysis of the Double Bottom Structure During Ship Grounding by Finite Element Approach

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LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES 2017年第6期14卷 1106-1123页

作者： Prabowo, Aditya Rio Cao, Bo Bae, Dong Myung Bae, Sung Yong Zakki, Ahmad Fauzan Sohn, Jung Min Pukyong Natl Univ Interdisciplinary Program Marine Convergence Desi Busan South Korea China Shipbldg Ind Corp Econ Res Ctr Beijing Peoples R China Pukyong Natl Univ Dept Naval Architecture & Marine Syst Engn Busan South Korea Diponegoro Univ Dept Naval Architecture Semarang Indonesia

Possibility of a water-transportation mode to experience numerous accidental loads is predicted limitless and always demand sustainable analysis. Impact phenomenon raises as main reason of environmental damage, for instance, grounding contributes in form of short-time impact and produces massive damage on the bottom structure of a marine vessels, e.g. ship. In this work, a series of numerical experiment is conducted with considering contribution of several parameters, namely impact location and seabed topology on the bottom structure of a tanker ship. The initial stage is conducted to obtain validation of the numerical method and configuration using impact test to ensure reliability of the present methodology which considers the finite element approach. In the second stage, proposed scenarios are calculated and overall evaluation of the damage extent is performed to observe resistance and behaviour of the bottom structure. Structural condition after grounding, rupture energy and crushing force are presented to observe history of grounding process. Contribution of the numerical parameter in form of meshing size is presented to provide adequate consideration in both of physical and numerical parameters. Finally, tendency of the target structure is summarized to provide prediction of further behaviour during the bottom structure experiences grounding with various scenarios. An alternative solution in respecting time cost is proposed and can be considered for other impact simulation and analysis.

关键词： Ship grounding bottom structure seabed topology finite element (FE) method structural behaviour

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Effects of the rebounding of a striking ship on structural crashworthiness during ship-ship collision

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THIN-WALLED STRUCTURES 2017年第Jun.期115卷 225-239页

作者： Prabowo, Aditya Rio Bae, Dong Myung Sohn, Jung Min Zakki, Ahmad Fauzan Cao, Bo Cho, Joung Hyung Pukyong Natl Univ Interdisciplinary Program Marine Convergence Desi Pusan South Korea Pukyong Natl Univ Dept Naval Architecture & Marine Syst Engn Pusan South Korea Diponegoro Univ Dept Naval Architecture Semarang Indonesia China Shipbldg Ind Econ Res Ctr Beijing Peoples R China

The purpose of this paper is to study the rebounding phenomenon of a striking ship and its effect on the structural crashworthiness of the struck ship. Pioneer works on ship collision and mathematical formulations to assess energy after collision are described to summarize the behaviour of the ship structure under collision between ships in various scenarios. A benchmark study is conducted using laboratory tests of the resistance to penetration of a stiffened plate to validate the methodology of the present work, which uses finite element methods to model a series of dynamic collision scenarios. The setting and configuration of a full-scale collision analysis is introduced, along with the configurations of the defined scenarios. External and internal ship collision parameters are considered as parameters that will affect structural behaviour prior to and after ruptures. The results of the evaluation indicate that in the event of a side collision, the striking ship can either fully stuck or rebounding phenomena. These phenomena produce significant differences in term of internal energy and crushing force, which are included as crashworthiness criteria. The type of striking ship, as well as its velocity, significantly affects the rebounding of the striking ship and behaviour of the struck ship. A notable gap between medium and high-carbon steels is not found during observations of the structural crashworthiness accounting for structure materials. Finally, other criteria for assessing the mechanisms and effects of rebounding during a collision are summarized, i.e. kinetic energy, acceleration, and extent of damage.

关键词： Ship collision Bow-side interaction Structural crashworthiness Striking ship's rebounding Resistance to penetration Finite element experiment

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Analysis of Structural Crashworthiness and Estimating Safety Limit Accounting for Ship Collisions on Strait Territory

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LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES 2017年第8期14卷 1594-1613页

作者： Prabowo, Aditya Rio Bae, Dong Myung Cho, Joung Hyung Sohn, Jung Min Pukyong Natl Univ Interdisciplinary Program Marine Convergence Desi Busan South Korea Pukyong Natl Univ Dept Naval Architecture & Marine Syst Engn Busan South Korea

A series of analyses are carried out to predict the structural crashworthiness of a ship during a collision. The numerical configuration is verified by structural simulations based on a laboratory experiment wherein a penetration test is considered as the experimental reference. Comparative observations of structural behaviour are carefully conducted to ensure the reliability of the present method for conducting large-scale collisions. At this stage, the proper procedure and configuration for structural calculations subject to accidental loads are determined. The second stage addresses the calculations for various side collision scenarios. The simulations consider a double hull Ro-Ro passenger ship being struck at various locations, and the overall behaviour of the side hull along the longitudinal axis is observed. The main study considers the target location and striking speed to obtain adequate data related to crashworthiness criteria, i.e. the internal energy and extent of damage. Finally, the criteria of various scenarios are summarized. Further calculations comparing the results with a safety factor are presented together with a consideration of structural behaviour to estimate the safety limit within the confines of strait territory.

关键词： Collision phenomenon penetration test target location striking velocity crashworthiness criteria speed limit

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The Effectiveness of Thin-Walled Hull Structures Against Collision Impact

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LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES 2017年第7期14卷 1345-1360页

作者： Prabowo, Aditya Rio Baek, Seung Jun Cho, Hyun Jin Byeon, Jung Hoon Bae, Dong Myung Sohn, Jung Min Pukyong Natl Univ Interdisciplinary Program Marine Convergence Desi Busan South Korea Pukyong Natl Univ Dept Naval Architecture & Marine Syst Engn Busan South Korea

The impact phenomenon is one of many subjects that is interesting and has become an inseparable part of naval architecture and ocean engineering fields. Limitless possibilities in cause and scenario make the demand to understand the physical behavior of ship structures due to impact phenomenon is increasing. In present work, a series of virtual experiment is performed by finite element method to solve several defined collision scenarios. Two involved ships are classified as the striking ship which penetrates the target and struck ship as the target. Hull arrangement of the struck ship is considered as main parameter which single and double hull configurations are proposed to be assessed. An observation of the damage extent on struck ship subjected to collision loads are presented. The results indicate that the internal arrangement of the struck ship provides significant effects to resistance capability and structural failure after collision process. Finally, an analysis regarding the extent of the damage is summarized with a statistical calculation to provide distribution of crash-worthiness criteria of the defined scenarios.

关键词： Impact phenomena ship-ship collision single and double hull structures internal energy damage extent

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Dynamic behaviour of a two-microbubble system under ultrasonic wave excitation

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ULTRASONICS SONOCHEMISTRY 2018年 43卷 166-174页

作者： Huang, Xiao Wang, Qian-Xi Zhang, A. -Man Su, Jian Harbin Engn Univ Coll Shipbldg Engn Harbin 150001 Heilongjiang Peoples R China Univ Binningham Sch Math Ring Rd N Birmingham B15 2TS W Midlands England Dalian Univ Technol Sch Naval Architecture Dalian 116024 Peoples R China Univ Fed Rio de Janeiro COPPE Nucl Engn Program CP 68509 BR-21941972 Rio De Janeiro Brazil

Acoustic bubbles have wide and important applications in ultrasonic cleaning, sonochemistry and medical ultrasonics. A two-microbubble system (TMS) under ultrasonic wave excitation is explored in the present study, by using the boundary element method (BEM) based on the potential flow theory. A parametric study of the behaviour of a TMS has been carried out in teens of the amplitude and direction of ultrasound as well as the sizes and separation distance of the two bubbles. Three regimes of the dynamic behaviour of the TMS have been identified in terms of the pressure amplitude of the ultrasonic wave. When subject to a strong wave with the pressure amplitude of 1 atm or larger, the two microbubbles become non-spherical during the first cycle of oscillation, with two counter liquid jets formed. When subject to a weak wave with the pressure amplitude of less than 0.5 atm, two microbubbles may be attracted, repelled, or translate along the wave direction with periodic stable separation distance, depending on their size ratio. However, for the TMS under moderate waves, bubbles undergo both non-spherical oscillation and translation as well as liquid jet rebounding.

关键词： Microbubble dynamics Ultrasonic wave Boundary element method

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Performance assessment on a variety of double side structure during collision interaction with other ship

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CURVED AND LAYERED STRUCTURES 2017年第1期4卷 255-271页

作者： Prabowo, Aditya Rio Sohn, Jung Min Bae, Dong Myung Cho, Joung Hyung Pukyong Natl Univ Interdisciplinary Program Marine Convergence Desi Busan South Korea Pukyong Natl Univ Dept Naval Architecture & Marine Syst Engn Busan South Korea

The main goal of the present paper was to study the physical response of a double side skin (DSS) structure under impact load in a collision event between two ships. Collision energy and damage extent (size and location) during the collision process were observed together with damage patterns on side structure. The ships were modeled after a Ro-Ro passenger ship and cargo reefer which were involved in a ship collision on the Sunda Strait while the analyses were performed using non-linear simulations FEM to produce virtual simulation data. Several cases were proposed to be investigated in this work with involvement of parameters i.e. penetration location and ship materials which were embedded on the structure model. A series of material experiments and testing was conducted to obtain detailed material properties which were to be deployed in simulation. It was shown that, after penetration at the transition location, the striking ship was successfully deforming and forming tears to the inner skin. On the other hand, with identical structure and identical mass of construction, the use of high-strength low-alloy (HSLA) steel as the repair material offered considerably better capacity in absorbing the impact load than plain-carbon steel.

关键词： Ship-ship collision field survey material testing virtual experiment double side skin (DSS) collision energy damage characteristic

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Numerical simulation of dam breaking and the influence of sloshing on the transfer of water between compartments

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OCEAN ENGINEERING 2017年 146卷 125-139页

作者： Celis, M. A. C. Wanderley, J. B. V. Neves, M. A. S. Univ Fed Pernambuco Dept Mech Engn Naval Architecture Grp Recife PE Brazil Univ Fed Rio de Janeiro Program Ocean Engn BR-21941 Rio De Janeiro RJ Brazil

Dam breaking and sloshing are hydrodynamic phenomena of great importance in the assessment of progressive flooding of ships and offshore platforms. Recent experimental tests have generated more data with different configurations of openings and flooded compartments. The internal geometry of the compartments is important on the behavior and impact of the flooded water on the vessel motion. In this paper, a computational code is validated to simulate dam breaking and sloshing with two different configurations. Numerical results were obtained for recent experiments on transfer of water between connected neighboring compartments with two configurations of openings. The comparison with experimental data validated the numerical code and showed some important details of the flow field. The two configurations of sloshing are excited in sway motion, where certain amount of water flows from one side to the other through an opening and the other way round. The implemented numerical scheme is based on the finite difference method, where the Euler equations are solved using an upwind total variation diminishing scheme with a structured computational mesh.

关键词： Dam breaking Sloshing CFD FDM TVD Acoustic waves

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