• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.40 no.2
• /
• pp.149-154
• /
• 2004

Results of a numerical simulation of a flowing of the underwater vehicles hull with the pump-jet nozzle are presented. It was calculate velocity distributions coefficients of the lift force the longitudinal moment of the hull with the pump-jet nozzle and isolated hull for some values of angle of attack. It was shown that the area of the influence of the nozzle on the velocities distribution of the hull and character of changing of coefficients of the lift force and the longitudinal moment and their derivatives depending on angle of attack.

• Journal of the Korean Institute of Navigation
• /
• v.8 no.2
• /
• pp.43-50
• /
• 1984

When the static load is applied to the ship's hull the deflection due to the bending moment from longitudinal direction has not been considered in the usual calculation of maximum bending moment. In fact, however, the deflection of ship's hull must be affected by the above-stated bending moment, and in this case the value of the maximum bending moment would be lessened in comparision with the result of usual calculation. In this paper, the author at first calculated the difference between the two values in case of rectangular barge, and suggested a practical criterion of longitudinal strength.

• Journal of the Society of Naval Architects of Korea
• /
• v.52 no.4
• /
• pp.349-355
• /
• 2015

Through the recent accident, the checking of ultimate hull girder capacity for container ship should be needed. Smith’s method is well known as the only simplified method to access rapidly for ultimate hull girder capacity except very expensive nonlinear F.E approach. This simplified method, however, is admitted to apply only to bulker and tanker in accordance with Classification Rules up to now. The targets of this study are to verify effectiveness of the simplified method for container ship’s ultimate hull girder strength and to propose the safety factor considering the local bending in double bottom structures due to out of plane loads through the nonlinear F.E analyses. Two different sized ships and three loading conditions which are pure bending, homo-loading and one-bay empty condition were used for this study. Based on the F.E results, the present study showed that CSR’s simplified method is available for the ultimate hull girder strength of container ship and over 1.2 of safety factor should be applied to consider the local bending effect in double bottom structures due to out of plane loads such as sea pressure an cargo.

• KOREAN ASSOCIATION OF OCCUPATIONAL HEALTH NURSES
• /
• v.1 no.1 s.1
• /
• pp.76-81
• /
• 1994

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
• /
• 2000.04a
• /
• pp.95-95
• /
• 2000

• Journal of the Korean Institute of Navigation
• /
• v.7 no.1
• /
• pp.63-81
• /
• 1983

A vessel encountered heavy weather is face to two kinds of danger ; the danger of upset due to the lack of stability and the lack of the longitudinal strength. Generally a small vessel is face to the former and the large vessel to the latter. Most of people do not consider the danger of upset by the latter but the former. But many ships missed at sea, the exact causes being not known. This pper investigated and analyzed the causes of accidents. The result was that the lohgitudinal strength of the hull is not enough to cope with heavy weather, and the particular cautions are needed to handle a ship in heavy weather.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1993.04b
• /
• pp.242-246
• /
• 1993

설계경험이 적은 설계자를 지원하기 위하여, 범용 전문가시스템 쉘인Nexpert을 이용하여, 선체구조설계를 위한 전문가 시스템을 구현하였다. 지식베이스를 구축하기 위하여, 선급협회의 규정집과 실제로 설계실무에 이용되고 있는 기존의 선박구조 설계프로그램으로 부터 지식을 추출하였으며, 객체지향 개념을 이용하여 이 지식들을 조직 화 하였다. 또한, 공학설계 작업을 위해 추가로 요구되는 기능들을 접속하여 시스템을 구성하였다. 추가된 기능은, 종강도의 계산, 실적선 데이타베이스, 그래픽 사용자 인터페이스와 설계결과를 가시화하는 부분이다. 이 연구를 통해 범용전문가 시스템이 선박설계에 이용될수 있는 가능성을 보였으며, 그 추구해야할 방향을 설정할수 있었다. 특히, 어떤 설계결정에 이르는데 관여한 규칙들을 보여주는 기능의 유용성과, 개발된 시스템이 자주 개정되는 선급규정에 맞추어 쉽게 수정될수 있음이 관찰되었다.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2004.10a
• /
• pp.254-261
• /
• 2004

Until now, there are different kinds of design and evaluation method criteria for ship hulls and ship strength based on allowable stress design using past experiences. But for many sinking accidents of large ships in operation, it has also a doubt about allowable stress design. It is recognized that structural plastic collapse caused by large external force is a main cause of that accidents. Therefore, there is the need for new design criteria based on ultimate limit state with a consideration about progressive collapse behavior as a safety assessment of ship hulls. Also many aluminum alloy ships is built for the purposes of lightweight of ship hulls, with that, a developing of criteria based on ultimate limit state should be made. In this study, the ultimate strength characteristics of aluminum ship hull are investigated by the ALPS/USAS program using already developed design formula for aluminum plate and stiffened panel.

• Journal of the Society of Naval Architects of Korea
• /
• v.34 no.4
• /
• pp.84-90
• /
• 1997

The paper is mainly concerned with the applications tn develop an optimum structural design procedure for hatchcoverless container ship. L.R rules are applied to determine the scantlings of the longitudinal members. As for an object function of midship section design, the total sectional area of all the longitudinal members for midship section is selected. The SUMT procedure combined with direct search method is applied to the solution of nonlinear optimum design problem to find a optimum midship section arrangement. The results of optimization study show that the weight of model ship may be saved about 8.0% per unit length.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.4 no.2
• /
• pp.35-42
• /
• 1998

Marine casuality causes not only loss of lives and ships, but also severs damages to marine environment and related economic activities such as fishing industry, sea farming, and tourist industry. Basically, the great effort should be made to prevent the occurrence of maritime accidents by any means. However, once accident has occurred, the salvage works should be done rapidly and properly based on theoretical and technical informations, which could minimize the risk during salvage operation and the overall damage from the maritime accidents. Generally, to calculate accurate hydrostatics of a stranded ship, a large amount of input data is needed. But, an availability and a reliability of input data cannot be guaranteed in most situations, and the adequate time required for preparing all input data is not allowed to perform the timely operations of salvage. In this paper, the development process of simple computer program for salvage operation using limited input data is introduced and its application example is presented. This program was developed to provide technical support for planning salvage operations in the grounding accident.