• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 추계학술대회 논문집
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• pp.115-116
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• 2012

• 대한조선학회논문집
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• 제34권4호
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• pp.61-71
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• 1997

본 연구에서는 일정속도로 자유수면상을 항주하는 수중익쌍동선의 저항성능을 모형시험 및 수치계산에 의하여 해석하였다. 대상선형은 Wigley선형을 변형한 비대칭형 트랜섬(transom) 선미의 단동체(demihull)를 갖는 수중익쌍동선으로서 전진속도 Fn = 0.2 ~ 1.0의 범위 및 수중익의 입사각도를 $0.0^{\circ}$에서 $3.0^{\circ}$까지 변화시켜 가며 실험과 계산을 수행하였다. 실험은 인하대학교의 선형시험수조에서 수행되었으며, 수치계산은 유한차분법(Finite Difference Method)에 의하여 수행되었다. 모형시험 및 수치계산결과는 포일(foil)을 부착하지 않았을 때의 결과와 비교, 검토되었다. 수치계산결과와 실험결과는 정성적으로 일치함을 보였으며, 포일의 형태와 각도에 따라 항주자세와 저항성능의 변화를 확인하였다.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2012년도 전기공동학술대회 논문집
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• pp.191-191
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• 2012

• 대한조선학회논문집
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• 제51권4호
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• pp.291-299
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• 2014

In the design process of ship or its comprising components, the key to the successful design is how to guarantee the structural safety satisfying the international standard and regulation, which sometimes is not clear enough to cover the detail designs. This study deals with the design procedure for submersible viewing window installed in catamaran. As the window material, the Plexiglass, a type of reinforced plastic, is considered to satisfy the design requirements of international standard. Window thickness is calculated using geometric nonlinear finite element analysis, in order to take into account possible large deformation due to low stiffness of the Plexiglass, and the results are compared with those determined by the procedure specified in ISO12216. Finally, for the validation of proposed design, the pressure test had been carried out following the procedure specified in the standard, and structural safety was checked.

• International Journal of Ocean System Engineering
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• 제1권4호
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• pp.198-204
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• 2011

Recently, several problems have occurred in the space, infra-structure, and facility of the contiguity of existing harbors due to the trend of enlarged container vessels. In this regard, the Mobile Harbor has been proposed conceptually in this study as an effective solution for these problems. The concept is that of a transfer loader that transfers containers from a large container ship to the harbor on land, and is a catamaran type floating barge. The catamaran-type vessel is well known for its advantage in maneuverability, resistance, and effectiveness for working on board. For the safe and effective operation of the two floating bodies (a container ship and the mobile harbor in the near sea detached from the quay), robot arms, novel crane systems, and pneumatic fenders are specially devised with an additional mooring facility or DP (dynamic positioning) system. In this study, this concept is to be verified through comparison and simulation studies under various environmental conditions. It is shown that the proposed concept is in general feasible but there are several areas for further investigation and improvement.

• 대한조선학회지
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• 제19권4호
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• pp.39-45
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• 1982

A floating rig, which has been used to develop the ocean resources has a common characteristics with the catamaran ship that it is composed of the two simple hulls. So the motion responses of the floating rig can be predicted theoretically with the aid of the strip method as those of the catamaran. And for the strip method, the two-dimensional hydrodynamic coefficients are the most important inputs to predict the results accurately. In this report, a theoretical method is proposed for calculating two-dimensional hydrodynamic forces and moments acting upon arbitrary shaped twin-hull cylinders, which are forced to make a heaving, swaying and rolling oscillation about their mean position on the free surface of a finite depth water. The theoretical results by making use of the singularity distribution method are presented. The accuracy of the coefficients was confirmed to be reasonable by the comparison with the Ohkusu's results for two circular cylinders in an infinite depth water. The depth effects on two-dimensional hydrodynamic coefficients for two circular cylinders are also checked. In some range of wave numbers, large differences in the behavior of hydrodynamic coefficients between for a finite depth and for an infinite depth are shown.

• 한국해양공학회지
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• 제27권6호
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• pp.1-6
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• 2013

A 25ft class fishing leisure boat is developed, and the resistance performances are investigated by a model test in a high-speed circulating water channel. The design speed of the developed ship is 25 knots using a 150 ps outboard engine. A catamanan type hull form using a planing section is adopted considering the Froude number and large deck area. The effect of a center body attached on the bottom of the cross deck is studied under various conditions. Wave patterns are observed to make clear the relationship between the resistance performance and the wave characteristics. The results show that the shape of the center body and the position of the chine line can have a strong effect on the resistance performance in a certain velocity range.

• 대한조선학회논문집
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• 제30권3호
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• pp.1-15
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• 1993

국내외적인 여건 변화와 향후 초고속선 해상 수송시대에 대비한 세계 각국의 초고속선 개발에 대처하기 위하여 당사 선박해양연구소에서는 3단계 고속선 개발계획을 수립한 바 있다. 그 1단계 사업으로 300인 이상의 승객을 태우고 최고 속도 40노트 이상으로 왕복 800해리의 장거리를 운항할 수 있는 "장거리 고속 수중익 쌍동여객선"을 개발하여 건조하게 되었다. 본 장거리 고속 수중익 쌍동여객선의 설계과정을 통하여 국내에서는 최초로 기능별 최적화와 성능확인을 위한 방대한 양의 이론적 분석과 모형시험이 체계적으로 이루어졌다.

• International Journal of Naval Architecture and Ocean Engineering
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• 제12권1호
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• pp.38-47
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• 2020

The partial air cushion supported catamaran (PACSCAT) is a novel Surface Effect Ship (SES) and possesses distinctive resistance performance due to the presence of planing bottom. In this paper, the design of PACSCAT and air cushion system are described in detail. Model tests were carried out for Froude numbers ranging from 0.1 to 1.11, the focus is on the influence of air cushion system on resistance characteristics. Drag-reducing effect of air cushion system was proved by means of contrast tests in cuhionborne and non-cushionborne mode. Wave-making characteristics reflect that the PACSCAT would eventually enter planing regime, in which the air could just escape under the seals and the hull body could operate in a steady state. To acquire different air cushion pressure, air flow rate and leakage height were adjusted during tests. Experimental results show that the resistance performance in planing regime would decrease evidently as the increased air flow rate, however, the scheme with medium leakage height presents the best resistance performance in the hump region.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2017년도 추계학술대회
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• pp.232-233
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• 2017

본 연구에서는 선미 터널을 적용한 비대칭 고속 쌍동선을 수치해석 기법을 통해 선체의 유체동역학적 성능을 평가하였다. 선미터널 형상은 터널 출구 형상에 경사각에 따라 구분하였으며, 총 3가지 형상($0^{\circ}$, $3^{\circ}$, $6^{\circ}$)을 사용하였다. 결론적으로, 저항성능의 경우, 전 속도 구간에서 $0^{\circ}$ 경사각의 선미터널은 기존 대비 4.8-17.9% 감소한 것을 확인하였다. 하지만 $3^{\circ}$와 $6^{\circ}$경사각을 가진 선미터널은 각각 기존대비 5-14%와 5-29%의 저항이 증가하는 것을 확인하였다. 이와 달리, 트림각의 경우, $0^{\circ}$경사각은 전 속도구간에서 기존선형과 유사한 경향을 보였으나, $3^{\circ}$와 $6^{\circ}$경사각의 경우 각각 FnV=1.54이후에서 평형상태 유지 및 계속적인 감소 형태를 보였다. 이와 같은 형상은 터널 출구 영역에 경사각을 증가하는 것이 저항성능 측면에서 다소 악영향을 발생하지만 운항성능 측면에서는 기존대비 개선됨을 보여준다.