• 제목/요약/키워드: Hull-form design

검색결과 295건 처리시간 0.024초

Analysis of the dynamic characteristics for the change of design parameters of an underwater vehicle using sensitivity analysis

  • Jeon, Myungjun;Yoon, Hyeon Kyu;Hwang, Junho;Cho, Hyeon Jin
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제10권4호
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    • pp.508-519
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    • 2018
  • In order to design the hull form of an underwater vehicle in the conceptual design phase, the dynamic characteristics depending on the hull form parameters should be identified. Course-keeping stability, turning ability, yaw-checking ability, and mission competence are set to be the indices of the dynamic characteristics, and the geometric parameters for the bare hull and rudder are set to be the hull form design parameters. The total sensitivity of the dynamic characteristics with respect to the hull form parameters is calculated by the chain rule of the partial sensitivity of the dynamic characteristics with respect to the hydrodynamic coefficients, and the partial sensitivity of the hydrodynamic coefficients with respect to the hull form parameters. Based on the sensitivity analysis, important hull form parameters are selected, and those optimal values to satisfy the required intercept time of mission competence of a specific underwater vehicle and turning rate are estimated.

점성저항을 고려한 선형의 초기설계에 관한 연구 (A Study on the Preliminary Design of Hull Form considering Viscuous Resistance)

  • 이경도
    • 한국해양공학회지
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    • 제14권2호
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    • pp.112-116
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    • 2000
  • To determine a preliminary hull form with a minimum viscous resistance this study considers the systematic variations of full form and calculations of the viscous resistance for varied hull forms. A preliminary hull form can be determined from a parametric study of viscous resistance.

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Form Parameter Design 을 이용한 선형최적화 (Hull Form Optimization Based on From Parameter Design)

  • 이연승;최영복
    • 대한조선학회논문집
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    • 제46권6호
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    • pp.562-568
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    • 2009
  • Hull form generation and variation methods to be mainly discussed in this study are based on the fairness optimized B-Spline form parameter curves (FOBFC). These curves can be used both as indirect modification function for variation and as geometric entities for hull form generation. The flexibility and functionality of geometric control technique play the most important role for the success of hull form optimization. This study shows the hydrodynamic optimization process and the characteristics of optimum design hull forms of a 14,000TEU containership and 60K LPG carrier. SHIPFLOW has been used as a CFD solver and FS-Framework as a geometric modeler and optimizer.

Form Parameter 방법과 신경망을 이용한 초기 선형 설계 (Preliminary Hull Form Design Using Form Parameter Method and Neural Networks)

  • 박원;신성철;김수영;장현재
    • 한국해양공학회지
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    • 제13권4호통권35호
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    • pp.174-181
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    • 1999
  • A form parameter method compounds the form parameters which define the hull geometric characteristics. This method can transform a hull form by changing the form parameters. The form parameter method is a hull define method without utilization of mother ships. However it is difficult to determine these form parameters. Thus, we are complemented the form parameter method using the neural networks. It is found that the form parameter method using the neural networks is efficient in hull form design by consideration of application examples.

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조선 CIM을 위한 선형 설계 시스템에 관한 연구 (A Study on the Hull Form Design System for CIM In Shipbuilding)

  • 우일국;이원준;조학종;윤덕영;최영복
    • 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.

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순차적 설계기법에 의한 DWT 75,000 정유운반선의 선형설계 (Stepwise Hull Form Design of DWT 75,000 Product Oil Carrier)

  • 박연석;박세라;정요한;최정규;유재훈
    • 대한조선학회논문집
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    • 제53권6호
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    • pp.456-464
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    • 2016
  • To design the modified hull form with relatively unfavorable dimensions and constraints than the parent ship the stepwise design was applied. In each design step the resistance characteristics was estimated by numerical calculations using CFD programs as Wavis 1.4, Wavis 2.1 and Fluent 12.1. The wave profiles along hull surface by potential flow calculations were investigated to improve wave resistance by modifying the bow shapes. To improve the stern shapes with a point of viscous form resistance the pressure distributions on hull surface and the limiting streamlines are investigated by viscous flow calculations. The design objectives such as shortening the LBP, enlarging the propeller tip clearance, moving forward of the LCB location and increasing the displacement were applied by stepwise to develop the new hull form of DWT 75,000 product oil carrier. Finally a new hull form was developed without the resistance performance loss compared with the parent ship.

G/T 190톤급 한국 대형선망 본선의 저항저감에 대한 연구 (A Study on the Resistance Reduction of G/T 190ton Class Main Vessel in Korean Large Purse Seiner Fishing System)

  • 박애선;이영길;김두동;유진원;하윤진;진송한
    • 대한조선학회논문집
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    • 제49권5호
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    • pp.367-375
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    • 2012
  • In this study, hull form of main vessel of Korean large purse seiner fishing industry is developed for the improvement of resistance performance as well as for the satisfaction to the Standard of Fishing Convention, ILO. Through the modification of reference hull form parameters and local characteristics, the hull form development is carried out. The optimum hull form parameters are searched by Sequential Quadratic Programing(SQP) method with the power estimation method of Holtrop & Mannen. To minimize the wave resistance, bulbous bow parameters are determined by the bulbous bow design method of Alvarino. The plasmatic curve is redesigned from that of the reference hull by using Lackenby method. The resistance performances of the reference and designed hull forms are estimated by using numerical simulation method. Also, the judgment of seakeeping ability and the estimation of intact stability for the designed hull form is carried out. As a result, the optimum hull form is proposed. To verify the improvement of resistance performance, model tests are carried out in towing tank. The results show that the resistance of the designed hull form is about 14% smaller than that of the reference hull from at design speed. A new hull form proposed in this study can contribute to the development of the main vessel hull form of Korean large purse seiner fishing system.

고속 대형여객선의 선형특성에 대한 연구 (Review on the Hull form Characteristics of a High-Speed Large Passenger ferry)

  • 장학수;이화준;주영렬;전호환
    • 대한조선학회논문집
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    • 제40권4호
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    • pp.1-7
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    • 2003
  • Large Passenger Ferry has been delivered with a tendency of high speed since 1990´s. More than 50 ferries that exceed 25 knots in service speed are operating or under construction these days. Therefore, the hull form development for the large size ferry should be carefully carried out with some design points such as high service speed, severe criteria for stability, and complex design of appendages. This paper reviewed principal particulars and hull form characteristics of a high-speed large passenger ferry. It is also suggested the optimization method of hull form and appendages in point of resistance & propulsion performance. Finally, it is also introduced a high-speed large passenger ferry developed by Samsung Heavy Industries Co., Ltd., the key design points in hull form development.

Hull Form Design for Baltic Ice Class Aframax Tanker

  • Park Kyung-Duk;Son Jin-Soo
    • Journal of Ship and Ocean Technology
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    • 제9권2호
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    • pp.29-36
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    • 2005
  • A hull form of Baltic ice class IA Aframax tanker has been developed taking into consideration of powering performance in brash ice channels based on IA class rules. Speed performance of the ship hull form in normal seagoing has been validated through model tests in a towing tank. The hull form design developed in this work has demonstrated good speed performance in normal seagoing although the ship design is entitled to ice class IA.

유한수심(有限水深)에서의 선형계획(線型計劃) (A Study on the Characteristics of wave Resistance and Hull Form obtained at Finte Water Depth)

  • 김효철;서정천
    • 대한조선학회지
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    • 제17권1호
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    • pp.19-24
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    • 1980
  • From the singularity distribution which obtained by minimum wave resistance condition, optimum hull form is obtained by stream line trancing method as Inui and Pien did. Thus obtained hull form has a extruded bottom along a keel line. Therefore the hull form must be modified to have flat bottom. This modification process is conducted by putting a fictitious bottom. It is found out that the wave resistance does not significantly alter at design speed even though the hull form has remarkably changed at the bottom. Therefore flattening the bottom by the effect of depth may be more rational for practical hull form design than ordinary manual hull-form modification.

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