• Journal of the Society of Naval Architects of Korea
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• v.30 no.2
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• pp.123-131
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• 1993

Since the years of oil tanker production in the 70's, the concern of marine enviromental protection is worldwidely increased, at last it is compulsorily ruled to product the double hull tanker by International Maritime Organization(IMO). Throughout these informative years Daewoo Shipyard has developed the double hull VLCC for a future vessel. The paper presents hull design for 300K double hull VLCC which was carried out to satisfy with statutory requirement of it, focused the structural arrangement and direct calculation in cargo hold area.

• Journal of KSNVE
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• v.12 no.1
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• pp.27-34
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• 2002

• Bulletin of the Society of Naval Architects of Korea
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• v.32 no.4
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• pp.48-51
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• 1995

본 고에서는 실제 선박의 진동 양상을 근간으로 하여 최근의 초대형 유조선 및 콘테이너 운반 선의 선박진동에 대해서 개략적으로 고찰하여 보았다. 최근의 선박 진동 양상은 선박의 대형화와 고출력 및 고효율기관이 선박에 적용됨에 따라 프로펠러보다는 주기관에 의한 진동이 많이 발생 되므로 주기관으로 발생되는 종 기진력 및 선체에의 전달 메카니즘에 대해서 중점적으로 연구할 필요가 있다. 선박 진동은 현재의 추진기관 시스템이 선박에 적용되는 한 피할 수 없는 문제 이고 또한 최근에 거주성 및 작업성 향상을 위한 저진동 선박에 대한 요구도 점차 높아지고 있 으므로 진동 관계자들은 지속적인 관심을 갖는 것이 요구된다.

• Journal of the Society of Naval Architects of Korea
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• v.31 no.1
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• pp.1-13
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• 1994

Procedures for the development of a preswirl stator-propulsion system for a VLCC 300K are described in this paper. The preswirl stator-propulsion system is one of the compound propulsor systems, which is used for the purpose of recovering propeller slipstream rotational energy by locating a stator in front of the propeller. The preswirl stator-propulsion system can be considered as a most reliable energy saving device because of its simple mechanism. Five stators are designed for the existing hull form and propeller, and their effects are verified by model tests. Open-water test result of the preswirl stator-propulsion system at the cavitation tunnel show $4{\sim}6%$ increase of open-water efficiency compared to that of a propeller without stators. Maximum 6.5% decrease of delivered power at the design speed(15.5knots) is expected with the designed stator based on the analysis results of resistance and self-propulsion test at the towing tank.

• Bulletin of the Society of Naval Architects of Korea
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• v.30 no.2
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• pp.17-30
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• 1993

세계 조선소 중 최근에 single hull VLCC를 가장 많이 건조한 경험을 바탕으로 4척의 double side VLCC를 성공리에 인도하여 선주측으로부터 호평을 받고, 나아가 전 세계 최초로 double hull VLCC의 2척 동시 진수라는 성과를 거둘 수 있었던 것은, 각 type의 특성을 고려한 최적의 구\ulcorner/생산설비 및 작업환경 등을 고려한 개선사항을 설계에 적극 반영한 결과로 나타난 것이다. 최근에 신규 수주 상담이 진행되고 있는 double hull VLCC 선주들의 대부분은 당사에서 single hull VLCC를 건조한 경험이 있는 선주들로서, 그동안 고객 만족을 위한 운항, 보수, 점검, 통해, 안전 및 편의성 등 선박 성능향상 측면에서 노력한 결과로 볼 수 있으며, 여기에서 만족하지 않고 당사의 Motto인 VOF( Vessel do the First Class) 구현을 이루고자 최선을 다하고져 한다.

• Journal of the Society of Naval Architects of Korea
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• v.30 no.4
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• pp.61-73
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• 1993

In the present study, sloshing problem is analyzed by the application of Finite Difference Method. SOLA-SURF scheme is applied to the analysis of fluid motion considering free surface. Especially, the concept of impact buffer zone is introduced for the prediction of more realistic impact pressure on tank. Numerical computation is carried out for the typical three models, and the computed results show good agreement with experimental data. The computation is also performed for 300,000 tons VLCC as a real-ship application. From the present study, it is proved that this numerical technique is quite practical to the prediction of sloshing impact pressure.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2003.05a
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• pp.32-36
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• 2003

This paper deals with a theoretical method for the design of a biased asymmetric preswirl stator propulsion system which has been used to increase efficiency by the recovery of a propeller slipstream rotational energy by the counter rotating flow of a stator. In the case of full slow-speed ship, the upward flow is generated at the propeller plane by the after body hull form. The generated upward flow cancells the rotating flow of the propeller at the starboard part while it increases at port part. A biased asymmetric preswirl stator propulsion system consists of three blades at the port and one blade at the starboard which can recover the biased rotating flow effectively. This paper provides the design concept which gives more simple and a high degree of efficiency. The model tests for the designed compound propulsion system will be carried out later.

• Journal of the Society of Naval Architects of Korea
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• v.34 no.2
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• pp.64-74
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• 1997

The necessity and importance of fatigue failure to variable load has been appreciated as the structural design technique develops and use of high tensile steel is increasing. This is much more appreciated for a large ship such as VLCC. The rigorous fatigue analysis and safety assessment should be, hence, carried out at the design stage to avoid the possibility of fatigue failure and to achieve the design result having a sufficient structural safety to fatigue strength. This paper deals with an efficient spectral fatigue analysis of ship structures by introducing the concept of stress influence coefficient. In the process included are probabilistic loading analysis, evaluation of long-term distribution of stress range and estimation of fatigue life applying the spectral fatigue analysis. An integrated computer program has been developed in which reliability analysis to fatigue strength is also included and has been applied to D/H VLCC.

• Journal of Korea Port Economic Association
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• v.32 no.4
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• pp.15-28
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• 2016

Port of Busan is Korea's largest trading port processing over 18,000 TEU a year. This rapid growth causes air pollution problems in Busan. Ship emissions are significant air pollution sources and port area is relatively close to the business district, therefore it may have serious effects to the health of local people and environment. In this study, ship emissions are estimated, especially on hotelling large vessels. As a result, Port of Busan has 50,686, 48,842 ship calls and 2,343,037 and 2,297,118 tons of ship emissions in 2011 and 2012 respectively. Also, the environmental cost in Port of Busan is approximately 1.2 trillion won per year. This study emphasizes the necessity of ship emissions regulation, hence, it is expected to make a significant contribution in setting up ship emission management system.

• Journal of Navigation and Port Research
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• v.36 no.1
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• pp.21-26
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• 2012

Recently, vessel hijacking by pirates has been a big issue around the world. For example, the hostages of VLCC "SAMHO Dream" were released for a large sum of ransom. On January 20, 2011 "SAMHO Jewelry" succeeded releasing all of the 21 crews on the vessel by attacking the pirates in international waters for the first time since the founding of the Naval Force. Furthermore, the "HANJIN Tianjin" crews evacuated to the Citadel promptly and were rescued by the navy. As hijacking of Korean vessels by pirates is increasing, various safety measures must be implemented. As a matter of fact, the standard for ship's facilities has been partially revised and setting up an evacuation shelter on all vessels sailing dangerous zone has been reinforced. This research aims to discuss crew Citadel installation on vessels intended for long haul. In addition, it will look at measures against potential gas flow in the event of pirate armed attacks and fire outbreak onboard a vessel. It will also assess the optimal number of crew Citadels theoretically. Lastly, the optimal number of shelters in the event of fire outbreak will be discussed based on an FDS simulation.