• 제목/요약/키워드: Propeller Arrangement

검색결과 11건 처리시간 0.019초

공기부양선의 추진기 고찰 (A Study of Aero for Hovercraft)

  • 강동우;이인선
    • 대한조선학회 특별논문집
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    • 대한조선학회 2008년도 특별논문집
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    • pp.62-67
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    • 2008
  • The hovercraft is the amphibious hovercraft. Design and manufacturing companies of the aero propeller exist rarely in the world. Hence the propeller has beef designed and manufactured by manufacturing companies which make aero propeller mainly. In this paper, the hovercraft propeller of similar, which is building and designing by HHIC, is considered the type of aero propeller, rotational speed, diameter, number of blades, Open air propeller efficiency. As the result of check, hovercraft which is necessary huge static thrust is needed the ducted propeller in order to improve climbing capacity. However, the number of blades and turning direction almost do not affect.

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가변추진기 추진축계시스템의 설계 (제 I 보 : 외형설계 ) (Design of Propulsion Shafting System for Controllable Pitch Propeller (I : Latout Design with Sizing))

  • 김기인;전효중;박명규;김정렬
    • 한국마린엔지니어링학회:학술대회논문집
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    • 한국마린엔지니어링학회 2002년도 춘계학술대회논문집
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    • pp.129-134
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    • 2002
  • This study is focused on the layout design with sizing for the main propulsion shafting with controllable pitch propeller system. For appropriate design and successful manufacturing of controllable pitch Propeller system, it is based on specifications to be required from the customer as well as the stresses calculation and analysis of main propulsion system for hollow shafting. And it must be performed according to the U.S military specifications MIL-STD-2189(SH) with drawing of NAVSHIPS 803-2145807, and also the stress analysis by applying safety factor. The results are as follows : 1. For the main propulsion system with controllable pitch propeller, it is designed the following items propeller diameter, hub diameter, dimensions of oil distribution or actuating unit based on shaft mounting type, diameters of propeller and intermediate shaft, dimension of split muff coupling, coupling flange thickness and of coupling bolt diameter. 2. As the results, we can get complete our own design ability for the main propulsion shafting with controllable pitch propeller system with critical data which are necessary to establish shafting arrangement from the ship building companies.

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크루즈선의 횡동요 제어시스템에 미치는 포드 각속도의 영향 (The Effect of the Turning Rate of the Pod Propeller on the Roll Control System of the Cruise Ship)

  • 이성균;이재훈;이기표;최진우
    • 대한조선학회논문집
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    • 제49권1호
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    • pp.14-25
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    • 2012
  • Recently, the application and installation of the pod propeller to the cruise ship is dramatically increased. It is because pod propulsion system allows a lot of flexibility in design of the internal arrangement of a ship. To reflect this trend, many researches have conducted to use the pod propeller for the roll stabilization of a ship. In the paper, a roll stabilization controller is designed by using fins and pod propellers as the control actuators for cruise ships. Two kinds of control algorithms are adopted for the roll control system; LQR (Linear Quadratic Regulator) algorithm and frequency-weighted LQR algorithm. Through the numerical simulation, the effect of the turning rate of the pod propeller on the roll control system is analyzed. Analysis of the simulation results indicated that the turning rate of the pod propellers is one of the important parameters which give the significant effects on the roll stabilization.

스테레오 PTV와 스테레오 PIV에 의한 선박프로펠러 후류측정 (Measurements of a Ship's Propeller Wake with Stereoscopic-PIV and Stereoscopic-PTV)

  • 도덕희;황태규;이상준
    • 한국가시화정보학회지
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    • 제5권2호
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    • pp.26-32
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    • 2007
  • Stereoscopic PTV and Stereoscopic-PIV measurements have been carried out for the studies of the wake of a ship's propeller. Stereoscopic photogrammetry based on a 3D-PTV principle was introduced using two high-definition cameras(1k x 1k, 30Hz). The arrangement of the two cameras was based on angular position. The pair-matching of the three-dimensional velocity vectors were based on Genetic Algorithm based 3D-PTV technique. The results obtained by both measurement systems have been compared at the advance ratio J=0.88(290 rpm, d=54 mm). Turbulent properties have also been compared each other at the same condition.

워터제트 추진 모형시험에 대한 연구 (A Study on the Waterjet Propulsion in Model Scale)

  • 최균일
    • Journal of Advanced Marine Engineering and Technology
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    • 제21권5호
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    • pp.474-481
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    • 1997
  • Waterjet propulsion generally refers to propulsion of ships by internally mounted pumps with proper ducting. This arrangement of the actuator component of the system leads to the fundamental differences with respects to screw propeller system. In this paper, the basic hydrodynamic characteristics of waterjet propulsion was outlined to clarify the application consideration and proposal for carrying out model self-propulsion tests with waterjet propelled models was presented. The results of model self-propulsion tests carried out in the Hyundai Maritime Research Institute towing tank with catamaran ship were presented.

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181,000 DWT BULK CARRIER 전선 진동해석을 통한 전선진동특성 고찰 (The study of 181,000 DWT BULK CARRIER global vibration characteristic by global vibration analysis)

  • 임구섭;정태석;최영달;석호일
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2008년도 추계학술대회논문집
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    • pp.329-330
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    • 2008
  • The 181,000 DWT Bulk Carrier has a different deck house type, which is not typical for previous bulk carriers, to meet the new international rules for bulk carriers. This new deck house has much smaller transverse breadth than the hull's transverse breath, resulting in large levels of the transverse response of the deck house. In addition, the longitudinal response of the funnel showed rather a large magnitude of vibration, which are excited by the ship's main excitations such as the main engine H-moment and the propeller surface forte when the ship operates at the NCR and the MCR speeds In the ballast condition. To solve these issues, the global forced vibration analysis has been performed for the ship and the ship structure has been modified to reduce the vibration level by increasing the girder depth and adjusting the engine room tank arrangement.

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선박용 프로펠러 주조시 주형 지그 최적화 (Optimization of Flask Fixtures for Marine Propellers Castings)

  • 박상철
    • 한국산학기술학회논문지
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    • 제13권8호
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    • pp.3334-3338
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    • 2012
  • 본 연구는 프로펠러 주조시 사용되는 지그를 개선하기 위하여 수행된 것으로, 주조시 주형을 지지하는 강관 지그에 발생하는 응력을 실험적, 해석적인 방법을 사용하여 평가한 결과 주형의 높이방향 변형을 방지하기 위하여 사용된 수직 지그는 작용하는 응력수준이 낮고 주형 상부 지지대에 추가적으로 하중을 가하고 있기 때문에 주형에 적용할 필요가 없다. 또한 주형의 회전을 방지하기 위하여 수평방향으로 설치한 측면 강관 지그도 작용하는 응력수준이 낮아 부착할 필요가 없으며, 주형 모서리 부분에 설치한 강관 지그는 압축력이 크게 작용하는 상부 주형 강관 지그를 제외하고 하부 주형에 설치된 강관 지그는 적용할 필요가 없다는 것을 알 수 있다.

선미 스케그 주위의 유동 분석에 의한 선미 형상 설계 (The Stern Hull Form Design using the Flow Analysis around Stern Skeg)

  • 박동우
    • 대한조선학회논문집
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    • 제45권4호
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    • pp.361-369
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    • 2008
  • The optimized distance between skegs and angle of the skeg for a standard twin-skeg type LNG carrier were presented using the CFD and model tests. The evaluation method of self-propulsion performance was derived based on the results of CFD and confirmed the validity through model tests. The analyses to assess self-propulsion performance using CFD were shown by flow line patterns on the skeg surface, nominal wake distribution in the propeller plane and the evaluation for flow balance around stern skegs. The optimized ship that was applied to the optimized two design parameters in stern skeg arrangement for target ship was derived in this work. Finally speed performance of mother ship which is existing ship and optimized ship were compared through CFD and model tests. And the usefulness about the evaluation method of self-propulsion performance was reconfirmed.

3m Ferry 모형선의 Crabbing 시험 (Crabbing Test of a 3m Ferry Model)

  • 신현경;이형락
    • 대한조선학회논문집
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    • 제41권1호
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    • pp.40-46
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    • 2004
  • In this paper, one of the harbour manoeuvring tests is described. its goal is to investigate the so-called crabbing performance of ships. By crabbing is meant the ability of the vessel to move sideways with the use of her own manoeuvring devices like propellers, rudders, transverse thruster, etc. The crabbing model tests were carried out in the Ocean Engineering Wide Tank, University of Ulsan(UOU) to measure the transverse forces and yawing moments by the transverse thruster alone and the propeller-rudder arrangement in combination with the bow thruster. The comparison between UOU crabbing test results and data measured at one of foreign research institutes showed a little gap due to different rotating conditions of controllable pitch propellers.

CFD를 이용한 180,000 DWT Bulk Carrier용 Pre-Swirl Duct의 파라메트릭 설계 (Parametric Designs of a Pre-swirl Duct for the 180,000DWT Bulk Carrier Using CFD)

  • 조한나;최정은;전호환
    • 대한조선학회논문집
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    • 제53권5호
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    • pp.343-352
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    • 2016
  • In this study, a pre-swirl duct for the 180,000 DWT bulk carrier has been designed from a propulsion standpoint using CFD. The stern duct - designed by NMRI - was selected as the initial duct. The objective function is to minimize the value of delivered power in model scale. Design variables of the duct include duct angle, diameter, chord length, and vertical and horizontal displacements from the center. Design variables of the stators are blade number, arrangement angle, chord length, and pitch angle. A parametric design was carried out with the objective function obtained using CFD. Reynolds averaged Navier-Stokes equations have been solved; and the Reynolds stress model applied for the turbulent closure. A double body model is used for the treatment of free-surface. MRF and sliding mesh models have been applied to simulate the actuating propeller. A self-propulsion point has been obtained from the results of towing and self-propelled computations, i.e., form factor obtained from towing computation and towing forces obtained from self-propelled computations of two propeller rotating speeds. The reduction rate of the delivered power of the improved stern duct is 2.9%, whereas that of the initial stern duct is 1.3%. The pre-swirl duct with one inner stator in upper starboard and three outer stators in portside has been designed. The delivered power due to the designed pre-swirl duct is reduced by 5.8%.