• 한국군사과학기술학회지
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• 제21권4호
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• pp.429-436
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• 2018

The RCS value of maritime ship is indicator of ship's stealth performance and it should be particularly measured for navy ship to ensure survivability on the battlefield. In the design phase of the navy ship, a RCS prediction should be performed to reduce RCS value and achieve ROC(Required Operational Capability) of the ship through configuration control. In operational phase, the RCS value of the ship should be measured for verifying the designed value and obtaining tactical data to take action against enemy missile. During the measurement of RCS for the ship, ship motion can be affected by roll and pitch in accordance with sea state, which should be analyzed into threat elevation from view point of enemy missile. In this paper, we propose a method to measure and analyze RCS of ship in 3-dimensions using a ship motion measuring instrument and a fixed RCS measurement system. In order to verify the proposed method, we conducted a marine experiment using a test ship in sea environment and compared the measurement data with RCS prediction value which is carried by prediction SW($CornerStone^{TM}$) using CAD model of the ship.

• 대한조선학회논문집
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• 제35권4호
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• pp.98-108
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• 1998

중앙 단면도 등의 선박의 초기 구조설계는 여러 가지 이유로 2차원으로 설계되어 다른 설계부서에 도면으로 전달되고 있다. 본 연구에서는 기능이 서로 다른 여러 가지 컴퓨터 시스템사이의 데이터 교환을 위한 예제로, AutoCAD로 작성된 2차원의 초기 구조 설계 데이터를 구조해석(FEM) 시스템이나 상세설계 시스템(AutoDef)등의 다른 시스템에서 사용할 수 있는 데이터를 생성해 보았다. 이를 위해 STEP 제품모델의 방법에 따라 데이터가 정의 되었으며 2D 형상이나 3D 와이어프레임, 솔리드 모델등 다양한 형상을 다룰 수 있는 복합다양체 모델링 형상 도구인 ACIS가 사용되었다.

• 한국CDE학회논문집
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• 제7권3호
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• pp.157-169
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• 2002

In the initial stages of ship design, designers represent geometry, arrangement, and dimension of hull structures with 2D geometric primitives such as points, lines, arcs, and drawing symbols. However, these design information(‘2D geometric primitives’) defined in the drawing sheet require more intelligent translation processes by the designers in the next design stages. Thus, the loss of design semantics could be occurred and following design processes could be delayed. In the initial design stages, it is not easy to adopt commercial 3D CAD systems, which have been developed f3r being used in detail and production design stages, because the 3D CAD systems require detailed input for geometry definition. In this study, a semantic product model data structure was proposed, and an initial structural CAD system was developed based on the proposed data structure. Contents(‘product model data and design knowledges’) of the proposed data structure are filled with minimal input of the designers, and then 3D solid model and production material information can be automatically generated as occasion demands. Finally, the applicability of the proposed semantic product model data structure and the developed initial structural CAD system was verified through application to deadweight 300,000ton VLCC(Very Large Crude oil Carrier) product modeling procedure.

• 대한조선학회논문집
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• 제55권4호
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• pp.361-369
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• 2018

The ship surveyor makes a scheme of reasonable ship operation by examining whether the ship has been properly constructed in accordance with the rule of classification societies and international conventions or whether the facilities of the ship in operation meet the standard stipulated by law. Even though the ship surveyors of classification society generally consist of people who have the skill of design or operation of a ship, it takes a long time to train a surveyor to the maturity level. This paper describes the development of survey simulator based on virtual ship environment that enables the surveyor minimize trial and errors to survey the ships. By using VR(Virtual Reality) based survey simulator, surveyors possibly achieve improvement of competence in survey quality by means of safe and immersive training environment. In order to improve the usability and utility of the VR simulator, the ship 3D model has been generated using 3D CAD model for design and production in shipyard. Through this, we suggested the possibility of consistent use of 3D model as the digital twin of a ship.

• International Journal of Ocean System Engineering
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• 제2권3호
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• pp.170-175
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• 2012

Currently, most logistics use containers. The construction of new port and high speed medium size container ship for the transportation of merchandise have become very important. The problem of ship stability is also important because of its direct influence on the loss of human life, ships, and merchandise. The stability of a container ship during its operation is not a large problem because it is well considered in the design process. However, the assessment of ship stability during container loading/unloading in port still depends on the expertise of experienced personnel. In this paper, a model based simulation system is introduced, which is able to assess ship stability during container loading/unloading, using ENVISION, a general purpose simulation system.

• 대한조선학회논문집
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• 제33권1호
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• pp.182-188
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• 1996

선형 설계는 concurrent ship design의 첫단계로서, 조선 CIM 시스템 구축을 위해 매우 중요하다. 본 논문에서는 이러한 인식하에 CIM 개념에 입각한 초기 설계 단계에서의 선형 설계 업무와 기능에 대하여 정리하였다. 그리고, 상용 3D-CAD 시스템을 이용한 선형 설계 시스템(DWHULL)을 개발하였다. 결론 부에서는 향후 개발 방향 및 시스템 보완 사항을 제시하였다.

• 한국CDE학회논문집
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• 제4권4호
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• pp.381-390
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• 1999

In this study, a pseudo ship structure data model for the :.hip cargo hold structure based on STEP is proposed. The proposed data model is based on Application Reference Model of AP218 Ship Structure which is the model that specifies conceptual structures and constraints used to describe the information requirements of an application. And the proposeddata model refers the Ship Common Model framework for the model architecture which is the basis for ongoing ship AP development within the ISO ship-building group and the ship product definition information model of CSDP research project for analyzing the relationship between ship structure model entities. The proposed data model includes Space, Compartment. Ship Structural System, Structural Part and Structural Feature of cargo hold. To generate this data model schema in EXPRESS format, ‘GX-Converter’was used which enables user to edit a model in EXPRESS format and convert schema file in EXPRESS format. Using this model schema, STEP physical file containing design data for ship cargo hold data structure was generated through SDAI programming. The another STEP physical file was also generated containing geometry data of ship cargo hold which was extracted and calculated by SDAI and external surface/surface intersection program. The geometry information of ship cargo hold can be then transferred to commercial CAD system, for example, Pro/Engineer. Examples of the modification of the design information are also Presented.

• Journal of Ship and Ocean Technology
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• 제9권3호
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• pp.23-32
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• 2005

Ship STEP(Standard for the Exchange of Product Model Data) which is composed of AP 215 (Ship Arrangement), AP 216(Ship Hull Form), AP 218 (Ship Structure), has been developed more than last 10 years and it is now at the stage just before IS(International Standard). It is expected that ship STEP would be used for the seamless data exchange among various CAD/CAM/CAE systems of shipbuilding process. In this paper the huge and complicated data structure of ship STEP is briefly reviewed at the level of ARM(Application Reference Model) and some abstract test cases which will be included as part of the standards are introduced. Basically ship STEP has common data model to be used without losing compatibility among those three different ship AP's, and it is defined as the modeling framework. Typical cases of data exchange during shipbuilding process, such as hull form data exchange between design office and model basin, midship structure data between shipbuilding yard and classification society are reviewed and STEP physical data are generated using commercial geometric modeling kernel. Test cases of ship arrangement at initial design stage and hydrodynamic data of crude oil carrier are also included.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 춘계학술대회
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• pp.223-226
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• 2011

건축이나 조선소에서는 도면 설계를 위하여 캐드 프로그램을 활용하여 작업을 수행하고 있다. 그리고 작업 현장에서 설계를 참조하기 위하여 출력된 도면을 휴대하고 있다. 그러나 현장 환경이 열악하기 때문에 출력 도면은 훼손되기 쉽고 관리가 어려운 단점이 있다. 이 논문에서는 스마트 운영체제를 사용하고 있는 스마트 기기에서 캐드 도면을 출력하고 관리하기 위한 시스템 설계를 제안한다. 제안한 시스템에서는 화면 출력 속도를 개선하기 위하여 고정 그리드 파일 색인에 기반한 색인 파일을 사용하였다.

• 대한조선학회논문집
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• 제33권1호
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• pp.173-181
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• 1996

본 논문은 조선공업에 동시공학 개념을 적용하기 위한 것으로 선박 구조설계 및 모델링을 대상으로 한 것이다. 본 연구에서는 선박의 구조부재를 모델링하기 위한 방법으로서 범용 CAD시스템의 사용자 정의 언어(PPL, Parametric Programming Language)를 이용하는 방법과 이를 이용한 parametric macro를 이용하는 것을 제안하였다. 한편 모델링의 효율성 및 그 결과의 활용성을 고려하여 모델링 절차에 대하여 검토하였으며 각각의 모델링 절차들이 갖는 장단점을 비교하였다. 마지막으로 구조부재의 모델링 결과를 어떻게 활용하는가에 대하여 간략히 설명하였다.