• 한국해양공학회지
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• 제13권1호통권31호
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• pp.79-87
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• 1999

As it is well appreciated plate forming by line heating takes an important role in ship production process. The paper deals with the development of line heating simulator which can produce the resultant deformation due to line heating in a few minute adn with which user can see the result graphically. For the present purpose mechanical modelling is adopted which can explicitly represent the physical resultant of line heating. In developing the present line heating simulator several program modules are integrated by adopting GUI concept such that the simulator can produce resultant deformation with keeping high accuracy. Application example is illustrated for the twisted shape surface which can be frequently seen in ship and offshore structures.

• Journal of Ship and Ocean Technology
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• 제1권1호
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• pp.48-56
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• 1997

This paper deals with the energy dissipation of ductile metal plate due to cutting. By using nondimensional analysis, we present that the dissipation energy of tearing behaviour can be formulated as a function of slenderness ratio expressed by cutting length, yield stress, plate thickness and elastic modulus. The validity of the proposed formula for Al-alloy, copper and mild steel is demonstrated by comparing the proposed formula with experimental results, which are shown in good agreements except for thick mild steel plate.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 춘계학술대회 논문집
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• pp.23-24
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• 2008

• 대한조선학회논문집
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• 제31권1호
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• pp.42-49
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• 1994

조선 CIM 시스템은 제품 모델을 중심으로 한 정보의 통합화를 중점적으로 추구하여야 하므로, 이 제품 모델을 기능 모델과 형상 모델로 구분하였다. 조선을 위한 제품 모델의 근간이 되는 형상 모델을 오일러 조작을 기초로 하는 비다양체 모델의 자료 구조를 이용하여 각각 구획 배치, 구조 설계 및 공정 계획의 입장에서 이용하는 방법에 대하여 연구하였다.

• 소성∙가공
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• 제19권2호
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• pp.120-126
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• 2010

The line array roll set(LARS) process, as one of many kinds of incremental forming processes, is a continuous process in which a flat metal plate is formed into a singly or doubly curved plate through successive passes of forming rolls. It was found that the curvature level of the formed plates in the previous study was well over the curvature required in shipyards. This fact shows that the LARS method has good potential for shipbuilding applications. The major purpose of the present study is to estimate experimentally the general applicability of the line array roll set process for the manufacture of ship hull plates. In this study, the target shapes are selected through investigation of the shape classification of ship hull plates that comprise a certain vessel. Forming processes for twisted shapes are analyzed with the finite element method(FEM) and the results of experimental work are presented. On the basis of the experimental and numerical results, the LARS process is applied to the production of real outer hull plates of a small patrol ship.

• 대한조선학회논문집
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• 제40권3호
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• pp.29-36
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• 2003

In rough seas, bow-flare regions of the fine ships (container ship and PCC) are subject to high impact pressures due to the bow-flare slamming. And many ships suffer structural damages in that region, even though they were built under the bow structure strengthening rules of the ship classes. So, a new design method for bow-flare structure is highly required. In this paper, a new prediction method of the bow-flare impact pressure (in terms of equivalent static pressure) acting on the fine ships' bow is presented. This method is based on the 11 fine ships' damage analysis and the mechanisms of water entry impact and breaking wave impact. Calculation results of the bow-flare impact pressure and the shell plate thickness are shown and discussed. Through the example calculations, it was found that the present method is useful for the structure design of the fine ships' bow.

• 한국컴퓨터정보학회논문지
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• 제16권6호
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• pp.165-178
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• 2011

선박 건조공정의 초기 단계인 강재적치처리공정에서는 입수한 강재를 어느 선박블록을 제작하는데 사용될 것인가에 따라 수십 개의 적치장을 이용하여 분류한다. 이 과정에서 강재를 잘못된 적치장에 적치하는 적치 오류, 무거운 강재를 다루는데 수반되는 작업자 안전 취약성, 각 적치장의 강재 정보 관리의 미비로 인한 작업 계획의 불확실성 등으로 인하여 생산성이 크게 저하된다. 이러한 문제점을 해결하기 위하여 상황인식 컴퓨팅 기술을 적용하여 지능형 강재적치처리시스템을 구축하였다. 연구의 효율성을 위하여 강재적치처리 작업과정을 보여줄 수 있는 시뮬레이터를 제작하였으며, 센서, RFID 태그, 실시간 위치추적시스템과 같은 기술을 활용하여 공간 내에 있는 객체들의 위치 및 작업 처리 상태 등, 상황정보를 실시간으로 획득할 수 있도록 유비쿼터스 컴퓨팅 공간을 구축 하였다. 본 연구는 유비쿼터스 컴퓨팅 기술을 적용한 선박 건조 생산성 제고는 물론 대규모 생산현장에 IT를 적용하는 제조IT 융합연구의 새로운 모델을 제시하였다는데 의미가 크다고 할 수 있다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2004년도 가을 학술발표회 논문집
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• pp.254-261
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• 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.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2004년도 학술대회지
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• pp.408-413
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• 2004

High speed planning boats also have been required more and more the rational strength analysis and evaluation for the optimal structural design in respect of the structural lightness according to the high speed trend. Even though the suggestion of the simple type equation for the equivalent dynamic pressure is reasonable to design the scantling of ship structure conveniently, many research activities for more reasonable improvement of the simple design pressure, have been continued to suggest the more accurate equivalent static description of tire structural response such as the deflection and stress of hull structure. In this research, we focus on the aluminum bottom stiffened plate structure in which structural scantling is mainly depend on the local loads such as dynamic or impact pressure without other load effects and structural response for the simple dynamic equivalent pressure was investigated through the structural analysis. In order to investigate the structural response of the bottom stiffened plate structure subjected to the dynamic equivalent design pressure, linear and nonlinear structural analysis of the bottom stiffened plate structure of 4.3 ton aluminum planning boat was performed based on the equivalent static applied loads which were derived from the KR regulation and representative one among various dynamic equivalent pressure equations. From above analysis results, we found that the response such as deflection and stress of plate member was similar with the response results of one plate member model with fixed boundary, which was published previous paper and in case of KR design loading, all response of stiffened plate structure were within elastic limit. Through the nonlinear analysis, nearly elastic behavior including the slight geometrical nonlinear response was dominant but plastic local zone was appeared at $85\%$ limit load. Therefore, we can say that through tire linear and nonlinear analysis, this stiffened plate member has no structural strength problem based on the yield criteria in case within $60\%$ limit load except the other strength point of view such as the fatigue and buckling problem.

• 한국항해항만학회지
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• 제26권1호
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• pp.50-54
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• 2002

선박은 박판으로 이루어진 상자형구조물이기 때문에 선박이 황천항해를 하게 되면 선체의 상갑판과 선저판에는 호깅이나 새깅이 반복적으로 일어나므로 선테판에는 인장력과 압축력이 반복적으로 작용하게 된다 이 중에서도 압축력이 작용하는 경우가 선박의 종강도상에 치명적인 결과를 가져올 수 있다. 따라서, 본 본문에서는 선체판중에서 종횡비가 1.4인 판을 대상으로 하여 탄소성유한요소해석을 통하여 압축하중을 계속적으로 증가시켜 좌굴과 함께 탄소성대변형거동을 밝힘과 동시에 2차좌굴과 탄소성거동과의 메카니즘을 규명하여 압축하중을 받는 선테판의 탄소성대변형거동을 규명하였다.