• 대한조선학회논문집
• /
• 제59권4호
• /
• pp.251-251
• /
• 2022

• 해양환경안전학회지
• /
• 제28권2호
• /
• pp.394-405
• /
• 2022

본 논문은 CFD 해석법을 이용한 단일선체 및 이중선체 선박의 손상에 따른 기름 유출량 추정 결과를 소개한다. 수치해석 기법으로 다상유동 해석법을 사용하고 기름 유출 유동에 대한 다양한 수치해석적 조건의 변화에 대한 영향을 조사하였다. 좌초 또는 충돌에 의한 다양한 손상 조건에서의 기름 유출량의 변화를 해석하였으며 실험 결과를 통해 검증하였다. 본 논문의 수치해석 결과는 단일선체와 이중선체의 기하학적 특성을 따라 실험 결과와 잘 일치하였다. 특별히 물과 기름의 복잡한 상호작용이 나타나는 이중선체의 기름 유출 상황도 실험과 동일하게 타당하게 예측하였다. 본 연구를 통해 사고 선박의 기름 유출량 추정에 필요한 CFD기법을 정립할 수 있었다.

• 대한조선학회논문집
• /
• 제56권5호
• /
• pp.447-456
• /
• 2019

In the early stage of ship design, the rapid prediction of resistance of hull forms is required. Although there are more accurate prediction methods such as model test and CFD analysis, statistical methods are still widely used because of their cost-effectiveness and quickness in producing the results. This study suggests the prediction formula for the residual resistance coefficient (Cr) of the low-speed full ships. The formula was derived from the statistical analysis of model test results in KRISO database. In order to improve prediction accuracy, the local variables of hull forms are defined and used for the regression process. The regression formula for these variables using only principal dimensions of hull forms are also provided.

• 시스템엔지니어링학술지
• /
• 제7권2호
• /
• pp.31-37
• /
• 2011

Korean Naval Ship acquisition processes are very complicate. There are 4 phases, Feasibility Study, Concept Design, Basic Design, Detail Design and Construction. A number of organizations and support groups exist to acquire naval war ships. Thus, It is very important how to establish traceability about requirements. This work has investigated how to improve traceability about requirements using Shipboard Work Breakdown Structure.

• 대한조선학회논문집
• /
• 제48권3호
• /
• pp.281-287
• /
• 2011

This paper explains the basic theory and a new development of for the residual strength prediction program of the asymmetrically damaged ships, being capable of searching moment-curvature relations considering neutral axis mobility. It is noted that moment plane and neutral axis plane should be separately defined for asymmetric sections. The validity of the new program is verified by comparing moment-curvature curves of 1/3 scaled frigate model where the results from new algorithm well coincide with experimental and nonlinear FEA results for intact condition and with nonlinear FEA results for damaged condition. Applicability of new algorithm is also verified by applying VLCC model to the newly developed program. It is proved that reduction of residual strengths is visually presented using the new algorithm when damage specifications of ABS, DNV and IMO are applied. It is concluded that the new algorithm shows very good performance to produce moment-curvature relations with neutral axis mobility on the asymmetrically damaged ships. It is expected that the new program based on the developed algorithm can largely reduce design period of FE modeling and increase user conveniences.

• 해양환경안전학회지
• /
• 제10권2호
• /
• pp.23-27
• /
• 2004

1970년대의 해기사들의 선박의 안전에 대한 비판과 연구에서 문제를 제기한 후, 오늘날 국제해사기구(IMO)를 비롯하여 선박안전 평가 방법의 개발과 소개가 활발히 이루어지고 있다. 선박안전의 상당부분이 인적과실에 기인하여 이에 대한 고려 요구가 높아지고 있다. 본 연구에서는 선박안전평가 방법의 개요를 살피고 인적과실의 구조 인식을 통한 문화적, 교육적 영향인자에 대해 고찰함으로써 선박안전성 제고에 기여하고자 한다.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제6권4호
• /
• pp.1041-1063
• /
• 2014

Some results on the hydroelasticity of ultra large container ships related to the beam structural model and restoring stiffness achieved within EU FP7 Project TULCS are summarized. An advanced thin-walled girder theory based on the modified Timoshenko beam theory for flexural vibrations with analogical extension to the torsional problem, is used for formulation of the beam finite element for analysis of coupled horizontal and torsional ship hull vibrations. Special attention is paid to the contribution of transverse bulkheads to the open hull stiffness, as well as to the reduced stiffness of the relatively short engine room structure. In addition two definitions of the restoring stiffness are considered: consistent one, which includes hydrostatic and gravity properties, and unified one with geometric stiffness as structural contribution via calm water stress field. Both formulations are worked out by employing the finite element concept. Complete hydroelastic response of a ULCS is performed by coupling 1D structural model and 3D hydrodynamic model as well as for 3D structural and 3D hydrodynamic model. Also, fatigue of structural elements exposed to high stress concentration is considered.

• 대한조선학회논문집
• /
• 제42권6호
• /
• pp.698-709
• /
• 2005

This research analyzes the design work and construction work, which might be arising out of or during the procurement process of naval ships of the Korean Navy. This research also suggests the applicable information methodology driven out by utilizing PLM/POM tool, which could be one of practical solutions to the problems arising from the outcome of this analysis. As to the procedure and methodology of information technology of design and construction work of the ship, IPPD was adopted. Before its actual application, main contents of the IPPD were introduced in this research. And it's real application and subsequent concrete surroundings of IPDE were defined. In addition, addition, several detailed and necessary works to be fulfilled were defined, mainly focused on the application of IPDD for the design and construction stages of the ships suitable for the Korean Navy, And also, this analysis defines the main functions to be secured by adopting the PLM/POM tool and obtained the relevant functions partially herewith.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제7권2호
• /
• pp.364-374
• /
• 2015

The purpose of this research is to compare and analyze the advanced speed of ships with different rudder controller in wavy condition by using a simulation. The commercial simulation tool named AQWA is used to develop the simulation of ship which has 3 degree of freedom. The nonlinear hydrodynamic force acting on hull, the propeller thrust and the rudder force are calculated by the additional subroutine which interlock with the commercial simulation tool, and the regular wave is used as the source of the external force for the simulation. Rudder rotational velocity and autopilot coefficients vary to make the different rudder controller. An advanced speed of ships depending on the rudder controller is analyzed after the autopilot simulations.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제11권1호
• /
• pp.33-43
• /
• 2019

A comparison between sea trial measurements and full-scale CFD results is presented for two self-propelled ships. Two ships considered in the present study are: a general cargo carrier at Froude number $F_n=0:182$ and a car carrier at $F_n=0:254$. For the general cargo carrier, the propeller rotation rate is fixed and the achieved speed and trim are compared to sea trials, while for the car carrier, the propeller rotation rate is adjusted to achieve the 80% MCR. In addition, three grids are used for each ship in order to assess the grid refinement sensitivity. All simulations are performed using the Naval Hydro pack based on foam-extend, a community driven fork of the OpenFOAM software. The results demonstrate the possibility of using high-fidelity numerical methods to directly calculate ship scale flow characteristics, including the effects of free surface, non-linearity, turbulence and the interaction between propeller, hull and the flow field.