• Title, Summary, Keyword: Tanker ship

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Comparison Study on the Resistance Characteristics of an Arctic Tanker and a General Tanker (쇄빙 유조선과 일반 유조선의 저항특성 비교연구)

  • Kim, Hyun-Soo;Ha, Mun-Keun;Ahn, Dang;Chun, Ho-Hwan
    • Journal of the Society of Naval Architects of Korea
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    • v.43 no.1
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    • pp.43-49
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    • 2006
  • The hull form of icebreaking tanker depends on the trade route and ice characteristic. The hull form has to be designed for icebreaking concept if the vessel is operating in heavy ice and also the hull from has to be optimized for general tanker when the ship is operating in ice-free ocean. This paper presents comparison of ship resistance in pack ice, level ice and open water. Four ships are used to compare the resistance characteristic. One is conventional tanker and three ships are icebreaking tankers. The ice model test was carried out at the IOT (Institute for Ocean Technology, Newfoundland, Canada) and open water test was performed at 55MB (Samsung Ship Model Basin). The ice resistance of conventional tanker was predicted by Colbourne's method. The resistance of open water, pack ice and level ice are compared and discussed. The best hull form of icebreaker is not good in open water performance compare to conventional tanker. This result explains that the hull form of icebreaker and normal tanker have to compromise when the ship is operated in ice and ice-free condition. The result of this paper gives a guide for icebreaking tanker design.

Hull Form Design for Baltic Ice Class Aframax Tanker

  • Park Kyung-Duk;Son Jin-Soo
    • Journal of Ship and Ocean Technology
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    • v.9 no.2
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    • pp.29-36
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    • 2005
  • A hull form of Baltic ice class IA Aframax tanker has been developed taking into consideration of powering performance in brash ice channels based on IA class rules. Speed performance of the ship hull form in normal seagoing has been validated through model tests in a towing tank. The hull form design developed in this work has demonstrated good speed performance in normal seagoing although the ship design is entitled to ice class IA.

Comparative Study of Full-Scale Propeller Cavitation Test and LCT Model Test for MR Tanker (MR Tanker 실선 프로펠러 캐비테이션 시험 및 LCT 모형시험과 비교연구)

  • Ahn, Jong-Woo;Paik, Bu-Geun;Seol, Han-Shin;Park, Young-Ha;Kim, Gun-Do;Kim, Ki-Sup;Jung, Bo-Jun;Choi, Sung-Jun
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.3
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    • pp.171-179
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    • 2016
  • In order to study correlation of the propeller cavitation performance between a full-scale ship and a model ship for the MR Tanker, the full-scale ship and the model tests were conducted. The full-scale ship test is composed of cavitation observation, pressure fluctuation and noise measurements, which are conducted using 2 observation windows and 8 pressure transducers installed inside the full-scale ship above the propeller. The model test in the Large Cavitation Tunnel(LCT) was conducted at the same conditions as that of the full-scale ship and its results are compared with those of the full-scale ship. Through the model-ship correlation analysis, it is considered that the experimental technique for the MR Tanker class ship was verified in LCT.

A Study on the Minimum Weight and/or Cost Design of a Midship Structure of Oil Tanker (최소중량(最小重量) 및 건조비(建造費)를 위한 유조선(油槽船) 중앙단면(中央斷面) 설계(設計)에 관한 연구(硏究))

  • Z.G.,Kim;M.W.,Eo;J.G.,Shin
    • Bulletin of the Society of Naval Architects of Korea
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    • v.20 no.2
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    • pp.21-26
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    • 1983
  • In this light of economical engineering, the optimal configurations of ship structure that can save weights, production costs and operation costs should be investigated. This paper presents the general method of optimization based on non-linear programming and its application to weight and/or cost minimization of ship structure. Oil tanker is chosen as a ship type because of simple layout and easy calculation of stress. With the data of 16,200 DWT oil tanker built by KSEC 1980, this paper shows the procedure mentioned above by means of SUMT combined with two selected search methods. Then the differences between original and redesigned tanker structures are discussed.

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Application of Algebraic Stress Model to the Calculation of the Viscous Flow around a Ship (대수응력 난류 모델의 선체주위 점성유동해석에의 적용)

  • Oh K. J.;Choi J. E.
    • Journal of computational fluids engineering
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    • v.5 no.1
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    • pp.22-26
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    • 2000
  • The flow around a ship is complex, especially, at the stern region of a full ship, where highly curved streamlines, hook-shaped iso-velocity contours, and strong secondary flow exist. To resolve this complex flow, an Algebraic Stress Model(ASM) is applied. The calculations are performed for the HSVA Tanker. The results are improved comparing with those of standard k-ε turbulence model, but still show a little difference from the experiments.

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An optimization of crude oil tanker scheduling problems (유조선의 최적 운항일정계획)

  • 주재훈;김기석
    • Korean Management Science Review
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    • v.8 no.1
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    • pp.91-108
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    • 1991
  • This paper presents an efficient optimization algorithm for the crude oil tanker scheduling problem. The algorithm consists of two stages. In stage one, all the potentially optimal schedules (called 'candidate schedules') are generated from feasible schedules for each ship. In the second stage, a multiple ship scheduling problem is formulated as 0-1 integer programming problem considering only the those candidate schedules. The efficiency of the suggested algorithm was improved by exploiting the special structure of the formulation. The algorithm was illustrated by a numerical example and tested on practical ship scheduling problems.

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Study on Applicability of Ultimate Strength Design Formula for Sandwich Panels - Application Cases of Double Hull Tanker Bottom Structures

  • Kim, Bong Ju
    • Journal of Ocean Engineering and Technology
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    • v.34 no.2
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    • pp.97-109
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    • 2020
  • In this study, ultimate strength characteristics of clamped sandwich panels with metal faces and an elastic isotropic core under combined in-plane compression and lateral pressure loads are investigated to verify the applicability of the ultimate strength design formula for ship structures. Alternative elastomer-cored steel sandwich panels are selected instead of the conventional bottom stiffened panels for a Suezmax-class tanker and then the ultimate strength characteristics of the selected sandwich panels are examined by using nonlinear finite element analysis. The change in the ultimate strength characteristics due to the change in the thickness of the face plate and core as well as the amplitude of lateral pressure are summarized and compared with the results obtained by using the ultimate strength design formula and nonlinear finite element analysis. The insights and conclusions developed in the present study will be useful for the design and development of applications for sandwich panels in double hull tanker structures.

A Study on Cargo Ships Routing and Scheduling Emphasis on Crude Oil Tanker Scheduling Problems (배선 및 선박운항일정계획에 관한 연구 -유조선의 운항일정계획을 중심으로-)

  • Hugh, Ihl
    • Journal of the Korean Institute of Navigation
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    • v.14 no.1
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    • pp.21-38
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    • 1990
  • This paper discusses the various modes of operations of cargo ships which are liner operations, tramp shipping and industrial operations, and mathematical programming, simulation , and heuristic method that can be used to solve ships routing and scheduling problems for each of these operations. In particular, this paper put emphasis on a crude oil tanker scheduling problem. The problem is to achieve an optimal sequence of cargoes or an optimal schedule for each ship in a given fleet during a given period. Each cargo is characterized by its type, size, loading and discharging ports, loading and discharging dates, cost, and revenue. Our approach is to enumerate all feasible candidate schedate schedules for each ship, where a candidate schedule specifies a set of cargoes that can be feasibly carried by a ship within the planning horizon , together with loading and discharging dates for each cargo in the set. Provided that candidate schedules have been generated for each ship, the problem of choosing from these an optimal schedule for each ship is formulated as a set partitioning problem, a set packing problem, and a integer generalized network problem respectively. We write the PASCAL programs for schedule generator and apply our approach to the crude oil tanker scheduling problem similar to a realistic system.

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An Investigation on the Optimal Ship Size for Chemical Tankers by Main Shipping Routes (케미컬 탱커선 운항노선별 최적선형에 관한 연구)

  • Kim, Jae-Ho;Kim, Taek-Won;Woo, Su-Han
    • Journal of Navigation and Port Research
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    • v.39 no.6
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    • pp.439-450
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    • 2015
  • This study objects to find characteristics in chemical tanker markets and to determine optimal chemical tanker size using a total shipping cost in main trading route of asia chemical tankers .Precedent studies of determination of the optimal ship size and case studies about chemical tankers was carried out and tried to introduce a cost model which is applicable to chemical tanker. This study is dependant on numerical analysis and involves scenario analysis to minimize sensitivity of results. This analysis shows as follows. First, 12,000DWT tanker is an optimal size on the 'Far East-Middle East' services, 9,000DWT tanker is a most competitive on the 'Far East-South East Asia' services and 3,000DWT tanker is a most economic size on the 'Inner Far East' services at average market situation. Second, the bigger size of chemical tanker, the more competitive advantage the tanker will obtain when bunker fuel prices rise. Small size ship gets more competitive during bunker prices down. Third, market fluctuation of time charter rate for chemical tanker is less than 20% against its average time charter hire which means less volatile. And tanker's competitiveness per each size is remained mostly same when time charterer rates rise at same proportion. Fourth, bigger size chemical tankers have cost advantages when tanker's quantity of each part cargo increase. And small-sized tanks are more competitive when part cargo scales decrease. For the last, ship's port stay strongly influences on the determination of the optical tanker size. When vessel has shorter port stay, bigger-sized tanker will be more competitive and even can be competitive if applies in short voyage as well.

Effect of corrosion on the ultimate strength of double hull oil tankers - Part II: hull girders

  • Kim, Do Kyun;Park, Dae Kyeom;Park, Dong Hee;Kim, Han Byul;Kim, Bong Ju;Seo, Jung Kwan;Paik, Jeom Kee
    • Structural Engineering and Mechanics
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    • v.42 no.4
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    • pp.531-549
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    • 2012
  • Numerous oil tanker losses have been reported and one of the possible causes of such casualties is caused by the structural failure of aging ship hulls in rough weather. In aging ships, corrosion and fatigue cracks are the two most important factors affecting structural safety and integrity. This research is about effect on hull girder ultimate strength behavior of double hull oil tanker according to corrosion after Part I: stiffened panel. Based on corrosion data of Part I (time-dependent corrosion wastage model and CSR corrosion model), when progressing corrosion of fourtypes of double hull oil tankers (VLCC, Suezmax, Aframax, and Panamax), the ultimate strength behavior of hull girder is compared and analyzed. In case of the ultimate strength behavior of hull girder, when occurring corrosion, the result under vertical and horizontal bending moment is analyzed. The effect of time-dependent corrosion wastage on the ultimate hull girder strength as well as the area, section modulus, and moment of inertia are also studied. The result of this research will be useful data to evaluate ultimate hull girder strength of corroded double hull oil tanker.