• Journal of the Society of Naval Architects of Korea
• /
• v.41 no.5
• /
• pp.63-69
• /
• 2004

This study contains the CFD analysis to predict the flow in engine room and utilize the results as a reference for arranging smoke detectors. FLUENT, a commercial CFD code is adopted because of its good application experience in DSME(Daewoo Shipbuilding & Marine Engineering Co.. Ltd.). The target is the engine room of VLCC. which was delivered in 2002. The model for analysis includes main structure elements, ventilation ducts, main engine and other big size equipment. From the analysis results, the internal flow pattern can be observed and some guidelines for the position of smoke detectors cane be presented.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.3 no.S1
• /
• pp.55-73
• /
• 1997

It is well known that simulation study in the preliminary design stage of harbors or berths is of great use, since it can provide helpful informations to the designer from the view point of ship navigations. In this paper, a brief review is made in the safety assessment of ship navigation for a 320,000 DWT VLCC entering Yecocheon harbor area, which is carried out by shiphandling simulator system. The geographic data base for the harbor as well as the mathematical models of the ship and environmental effects are designed and developed. Based in the on-site inspections and interviews with pilots in Yeocheon area, basic maneuvering plans and consistence with real operation conditions. Berthing and deberthing maneuvering simulations as well as approaching and departing simulations are carried out by 3 experienced navigators according to the maneuvering plans and environmental scenarios. The simulation results are analysed in various ways to evaluate the quantitative and qualitative maneuvering difficulties and thereby to assess the safety of ship navigation in that area.

• Journal of Ship and Ocean Technology
• /
• v.5 no.4
• /
• pp.19-28
• /
• 2001

A comparative study of the new flexible double hull structure is presented as a collision energy absorbing system, which is constructed with mixed stringers comprising slant and straight stringers for the double hull tanker, The dimension and disposition of this mixed stringers are selected to give the maximum absorbing energy. From the viewpoint of collision energy absorbing efficiency, this structural system is compared with three other types of the double hull constructions with trapezoidal stiffener, stringer type and standard type of VLCC, 310K DWT, Based on the constant hull weight, the proposed double hull structure with mixed stringers shows a improved crashworthiness as the results.

• Journal of Ship and Ocean Technology
• /
• v.3 no.1
• /
• pp.12-26
• /
• 1999

A new concept of collision energy absorbing system for ;he New Oil-tankers with Advanced Double Hull Structure(NOAHS and NOAHS II) are presented through the joint-research pro-gran between Inha and Hamburg-Harburg University. A comparative study on col vision resistance of these proposed side structures with standard double hull structure of 310K DWT class VLCC, is carried out. The fatigue investigation of structural detail parts is also included. It contains a comparative fatigue study based on pertinent regulations of Classification Societies.

• International Journal of Naval Architecture and Ocean Engineering
• /
• v.7 no.2
• /
• pp.390-398
• /
• 2015

Energy-saving devices for 317K VLCC have been developed from a propulsion standpoint. Two ESD candidates were designed via computational tools. The first device WAFon composes of flow-control fins adapted for the ship wake to reduce the loss of rotational energy. The other is WAFon-D, which is a WAFon with a duct to obtain additional thrust and to distribute the inflow velocity on the propeller plane uniform. After selecting the candidates from the computed results, the speed performances were validated with model-tests. The hydrodynamic characteristics of the ESDs may be found in improved hull and propulsive efficiencies through increased wake fraction.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
• /
• 2002.10a
• /
• pp.51-55
• /
• 2002

End of July. 2002 Hyundai Heavy Industries Co. Ltd. Offshore Division is successfully completed Load-out & Float-off work of "AMENAM KPONO/FSO Project" similar to 300K VLCC size. The AMENAM FSO hull and topside module built at the HHI Offshore yard using "On-Ground Building Method" developed by HHI. Various methodologies/techniques like Flexi-built FPSO Hull. Topside module erection method. Load-out Float-off methodology etc. are combined to develop a successful on-ground building method. In this paper, we described the "Hull Structural Strength Analysis Methodology" using 3-D Finite Element Analysis and results. This analysis is performed to verily the structural integrity or the AMENAM FSO hull during the main load-out on two semi-submersible barges combined together.

• Journal of Hydrospace Technology
• /
• v.1 no.1
• /
• pp.89-110
• /
• 1995

The enactment of OPA90 (Oil Pollution Act of 1990) in the USA and the consequent moves by IMO(International Maritime Organization) to introduce new Regulations for the design of oil tankers led the oil transportation industry to undergo a period of big change. This resulted in the introduction of double hull tankers. This paper introduces the design for the 300, 000 DWT double hull VLCC of World-Wide Shipping Agency Pte Ltd. in Hong Kong, which is the first of this type constructed by Daewoo Shipbuilding & Heavy Machinery Ltd.(DSHM). The characteristics of the compartment and structural arrangement of this vessel are briefly described, and the scope of structural analysis is illustrated. In addition, the merits/demerits of different crosstie arrangements are described in the appendices.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2020.11a
• /
• pp.108-110
• /
• 2020

본 연구의 목적은 딥러닝 기법의 하나인 인공신경망 모델을 활용하여 선박의 가치평가 모델을 개발하는 것이다. 선박의 가치는 해운시장 변화와 밀접한 관계가 있으며, 경기 변동성이 크고 시장 민감성이 높은 해운시장의 특성상 가치의 불확실성 역시 높게 나타나고 있다. 이러한 선박가치의 중요성에도 불구하고 국내외적으로 선박가치평가의 체계 개선 및 평가모델의 객관성과 신뢰성을 제고시키기 위한 연구는 부족한 실정이다. 따라서 본 연구에서는 딥러닝 방법을 통해 선박의 가치를 산출하는 새로운 평가모델을 제시하고자 한다. 가치평가의 대상은 중고 VLCC선이며, 선행연구를 통해 선박의 가치 변화를 유발하는 주요 요인들을 선별하여 변수를 설정하고 2010년 1월부터 현재까지의 해당 데이터를 확보하였다. 교차검증을 통해 파라미터들을 추정하여 인공신경망의 최적 구조를 식별하고 이에 대한 객관성과 신뢰성을 검증한 결과 인공신경망 모델의 가치평가 정확성이 우수함을 확인하였다. 본 연구는 선박가치평가의 전통적 방법론에서 탈피하여 기계학습 기반의 딥러닝 모델을 활용한 측면에서 독창적인 의미가 있다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2022.11a
• /
• pp.155-155
• /
• 2022

유조선 우이산호 부두시설 접촉사고는 광양항 원유 2부두에 접근 중 과도한 속력 등 도선사의 부적절한 도선으로 좌회두를 적절하게 통제하지 못해 발생한 사고이다. 광양항 원유 2부두에 접안하고자 하는 VLCC는 부두 법선을 감안하여 약 10도 이내의 경사각으로 서서히 속력을 감속하면서 부두 전면 해상으로 접근하여 부두로부터 선폭의 약 2~3배 거리에 정선시킨 다음 예선의 도움을 받아 접안 예정 선박을 횡방향으로 5~10 cm/s 속도로 평행 이동시켜 부두에 계류시키는 것이 통상적인 접안 방법이다. 하지만, 우이산호의 부두 접근 시 속력을 살펴보면, 부두 1마일 전에서 8.4노트, 부두 0.5마일 전에서 7.1노트, 그리고 부두 0.2마일 전에서 5.2노트로 정상적인 타 선박의 속력보다 2~3배 빠른 속력으로 부두에 접근하면서 예선을 사용하였음에도 속력제어에 실패하여 부두와 접촉한 사고이다.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.3 no.S1
• /
• pp.53-53
• /
• 1997