• 제목/요약/키워드: Large Container Ship

검색결과 163건 처리시간 0.018초

초대형 컨테이너선박 방향타의 캐비테이션 수치계산 및 검증 (Numerical Calculation and Validation for Rudder Cavitation of a Large Container Ship)

  • 김건도;문일성;김경열;반석호;이창섭
    • 대한조선학회논문집
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    • 제43권5호
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    • pp.568-577
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    • 2006
  • With the increase of ship size and speed, the loading on the propeller is increasing, which in turn increases the rotational speed in the propeller slipstream. The rudder placed in the propeller slip stream is therefore subject to severe cavitation with the increased angle of attack due to the increased rotational induction speed of the propeller. In the present paper the surface panel method, which has been proved useful in predicting the sheet cavitation on the propeller blade, is applied to solve the cavity boundary value problem on the rudder. The problem is then solved numerically by discretizing the rudder and cavity surface elements of the quadrilateral panels with constant strengths of sources and dipoles. The strengths of the singularities are determined satisfying the boundary conditions on the rudder and cavity surfaces. The extent of the cavity, which is unknown a priori, is determined by iterative procedure. Series of numerical experiments are performed increasing the degree of complexity of the rudder geometry and oncoming flows from the simple hydrofoil case to the real rudder in the circumferentially averaged propeller slipstream. Numerical results are presented with experimental results.

컨테이너 터미널 선석길이 산정에 관한 실증 연구 (An Empirical Study on Berth-Length Calculation of Container Terminal)

  • 송용석;남기찬;연정흠;김정은
    • 한국항해항만학회지
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    • 제27권2호
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    • pp.179-184
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    • 2003
  • 부산항의 시설 능력 부족 문제를 해결하기 위하여 건설 중인 부산 신항만은 8,000 TEU급 대형선박의 입항이 가능한 환적항으로 개발되고 있다. 이러한 대형 항만의 경우 간선 항로를 운항하는 모선과 지선 항로를 운항하는 피더선이 동시에 입항하며, 터미널 설계 시 이러 한 상황을 반영하여 하역 능력, 운영계획, 장비 사양 등을 결정할 필요가 있다. 그러나 부산 신항만은 선석당 30만 TEU를 기준으로 터미널이 설계되었기 때문에 기존 주요 항만에 입항하는 다양한 규모의 선박을 고려하여 하역 능력을 검토할 필요가 있다. 따라서 본 논문에서는 선박 접안 능력의 관점에서 실제 두개의 터미널에 접안하는 선박의 규모별 적ㆍ양하량, 선박 길이 등을 반영해서 선석길이 및 선석 수를 산정하고 기존 터미널 개발계획과 관련하여 시사점을 제시하였다.

비선형 탄성 다점지지 베어링 요소를 이용한 선미관 베어링의 유효지지점 검증 (Verification of Effective Support Points of Stern Tube Bearing Using Nonlinear Elastic Multi-Support Bearing Elements)

  • 정준모;최익흥;김규창
    • 대한조선학회논문집
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    • 제42권5호
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    • pp.479-486
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    • 2005
  • The final goal of shift alignment design is that the bearing reaction forces or mean pressures are within design boundaries for various service conditions of a ship. However, it is found that calculated bearing load can be substantially variable according to the locations of the effective support points of after sterntube bearing which are determined by simple calculation or assumption suggested by classification societies. A new analysis method for shaft alignment calculation is introduced in order to resolve these problems. Key concept of the new method is featured by adopting both nonlinear elastic and multi-support elements to simulate a bearing support Hertz contact theory is basically applied for nonlinear elastic stiffness calculation instead of the projected area method suggested by most of classification societies. Three loading conditions according to the bearing offset and the hydrodynamic moment and twelve models according to the locations of the effective support points of sterntube bearings are prepared to carry out quantitative verifications for an actual shafting system of 8000 TEU class container vessel. It is found that there is relatively large difference between assumed and calculated effective support points.

Suggestions for the competitiveness of the Port-Logistics industry in Busan port area - Focus on the port transport industry and port transport related industry -

  • Lim, Dong-Seok;Kwak, Kyu-Seok;Nam, Ki-Chan
    • 한국항해항만학회지
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    • 제35권7호
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    • pp.597-604
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    • 2011
  • An environment of world marine port today is rapidly changing. Importance of a hub port is being maximized along with appearance of a large container ship, and Busan port is also growing with the goal as a hub port of Northeast Asia. Busan port currently has competitive power as the 5th top port in the world, but increase rate of transportation quantity, is low compared to Shanghai port in China and other ports in Northeast Asia. For a port to obtain competitiveness, investment on infrastructures of a port is necessary and also it has close relation with an intraregional port logistics industry. However, a port logistics industry in Busan area has a hard time avoiding a small size due to the government support on major companies. Therefore, this study will analyze difficulties of small port logistics companies and the related companies as to vitalize port logistics industry in Busan area in hopes to help vitalizing regional economy.

Development of Korea-China Train Ferry System An Example of Short Sea Shipping in Northeast Asia

  • Lee, Jae-Wook;Lee, Seung-Hee;Kang, Young-Jin
    • Journal of Ship and Ocean Technology
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    • 제10권3호
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    • pp.36-48
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    • 2006
  • The train ferry, accommodating trains roll on and off, is often called as 'Railway on the Sea' or 'Blue High-way' since she can connect the railways or roads segregated by the sea and improve the accessibility and continuity of land transport systems. The ferry is especially appropriate to the intermodal transport routes mostly passing through the land but have relatively short sea segment. As the train ferry can considerably reduce the cost and time for cargo handling and modal shift and unnecessitates excessive initial investment on infrastructures such as large harbor cranes or vast container yards, introduction of train Ro-Ro ferries lessen the total transport cost for door-to-door transportation with full exploitation of the existing railway system. All the ports placed in Shandong, Liaoning and Jiangsu provinces of China are connected to the hinterlands via well developed railway and road systems. Therefore, realization of the Incheon-Yantai train ferry system will link Korea railways to TCR and the 4,131-kilometer-long Longhai-Lanxin Railway, along the famous Eurasian Continental Bridge. In the present paper, the Incheon-Yantai train ferry will be introduced as a good example of an efficient multimodal short sea shipping system for Northeast Asia.

Numerical Simulation for the Rudder in order to Control the Cavitation Phenomena

  • Boo, Kyung-Tae;Song, In-Hang;Soochul Shin
    • Journal of Ship and Ocean Technology
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    • 제8권1호
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    • pp.42-50
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    • 2004
  • In these ten years, the cavitation and erosion phenomena in the rudder have been increased for high-speed container ships. The cavitation in the rudder blades which is injurious to rudder efficiency is mainly caused by the main flow with a large angle of attack induced by propellers, and the erosion which occurs as a result of repeated blows by shock wave that cavitation collapse may produce was observed in the gap legion of the rudder. However, gap cavitation is not prone to occur in model experiments because of low Reynolds number. So, the viscous effect should be considered for solving the flow of the narrow gap. In order to predict the cavitation phenomena and to improve the performance of the rudder, the analysis of the viscous flow in the rudder gap is positively necessary. In this study, numerical calculation for the solution of the RANS equation is applied to the two-dimensional flow around the rudder gap including horn part and pintle part. The velocity and pressure field are numerically acquired according to Reynolds number and the case that the round bar is installed in the gap is analyzed. For reduced the acceleration that pressure drop can be highly restrained numerically and in model experiment, the cavitation bubbles can be reduced.

혼 타 주위의 캐비테이팅 유동 특성에 대한 연구 (Cavitating-Flow Characteristics around a Horn-Type Rudder)

  • 최정은;정석호;김정훈
    • 대한조선학회논문집
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    • 제44권3호
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    • pp.228-237
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    • 2007
  • The flow characteristics around a horn-type rudder behind an operating propeller of a high-speed large container carrier are studied through a numerical method in fully wetted and cavitating flow conditions. The computations are carried out in a small scale ratio of 10.00(gap space=5mm) to consider the gap effects. The Reynolds averaged Navier-Stokes equation for a mixed fluid and vapor transport equation applying cavitation model are solved. The axisymmetry body-force distribution technique is utilized to simulate the flow behind an operating propeller. The gap flow, the three-dimensional flow separation, and the cavitation are the flow characteristics of a horn-type rudder. The pattern of three-dimensional flow separation is analyzed utilizing a topological rule. The various cavity positions predicted by CFD were shown to be very similar to rudder erosion positions in real ship rudder. The effect of a preventing cavitation device, a horizontal guide plate, is also investigated.

회전하는 선박 프로펠러 전방 유입류에 대한 PIV 속도장 해석 (PIV Velocity Field Analysis of Inflow ahead of a Rotating Marine Propeller)

  • 이상준;백부근
    • 대한조선학회논문집
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    • 제41권4호
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    • pp.30-37
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    • 2004
  • Flow characteristics of the inflow ahead of a rotating propeller attached to a container ship model were investigated using a two-frame PIV (Particle Image Velocimetry) technique. Ensemble-averaged mean velocity fields were measured at four different blade phases. The mean velocity fields show the acceleration of inflow due to the rotating propeller and the velocity deficit in the near-wake region. The axial velocity distribution of inflow in the upper plane of propeller is quite different from that in the lower plane due to the thick hull boundary layer. The propeller inflow also shows asymmetric axial velocity distribution in the port and starboard side. As the inflow moves toward the propeller, the effect of phase angle variation of propeller blade on the inflow becomes dominant. In the upper plane above the propeller axis the inflow has very low axial velocity and large turbulent kinetic energy, compared with the lower plane. The boundary layer developed along the bottom surface of stern hull forms a strong shear layer affecting vortex structure of the propeller near-wake.

부유식 인양크레인의 운동응답특성과 구조응답 평가 (A Structural Response Estimation and Response Amplitude Operator of Floating Type Salvage Crane)

  • 오영철;김옥석;이경우;고재용
    • 한국항해항만학회:학술대회논문집
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    • 한국항해항만학회 2013년도 춘계학술대회
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    • pp.132-133
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    • 2013
  • 선박 인양크레인은 선박을 안전하게 인양하기 위한 장비로서 이러한 형태의 크레인은 조선소의 대형 선박이나 항만 컨테이너 등에서 많이 사용되고 있다. 이와 같은 인양크레인은 육상에 설치되어 운용되고 이를 사용하기 위해서는 항만시설이 구축되어야 한다. 이 논문에서는 부유식 인양크레인의 운동응답특성과 파 강제력을 산출하고 부유식 인양크레인의 구조응답 평가를 수행하였다.

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Application of aerospace structural models to marine engineering

  • Pagani, A.;Carrera, E.;Jamshed, R.
    • Advances in aircraft and spacecraft science
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    • 제4권3호
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    • pp.219-235
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    • 2017
  • The large container ships and fast patrol boats are complex marine structures. Therefore, their global mechanical behaviour has long been modeled mostly by refined beam theories. Important issues of cross section warping and bending-torsion coupling have been addressed by introducing special functions in these theories with inherent assumptions and thus compromising their robustness. The 3D solid Finite Element (FE) models, on the other hand, are accurate enough but pose high computational cost. In this work, different marine vessel structures have been analysed using the well-known Carrera Unified Formulation (CUF). According to CUF, the governing equations (and consequently the finite element arrays) are written in terms of fundamental nuclei that do not depend on the problem characteristics and the approximation order. Thus, refined models can be developed in an automatic manner. In the present work, a particular class of 1D CUF models that was initially devised for the analysis of aircraft structures has been employed for the analysis of marine structures. This class, which was called Component-Wise (CW), allows one to model complex 3D features, such as inclined hull walls, floors and girders in the form of components. Realistic ship geometries were used to demonstrate the efficacy of the CUF approach. With the same level of accuracy achieved, 1D CUF beam elements require far less number of Degrees of Freedom (DoFs) compared to a 3D solid FE solution.