• 제목/요약/키워드: Hull

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Study on the Development of an Optimal Hull Form

  • Cho Hee-Jong;Lee Gyoung-Woo;Youn Soon-Dong;Chun Ho-Hwan
    • 한국항해항만학회지
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    • 제29권7호
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    • pp.603-609
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    • 2005
  • This paper presents the method for developing an optimum hull form with minimum wave resistance using SQP( sequential quadratic programming) as an optimization technique. The wave resistance is evaluated by a Rankine source panel method with non-linear free surface conditions and the ITTC 1957 friction line is used to predict the frictional resistance coefficient. The geometry of the hull surface is represented and modified using NURBS(Non-Uniform Rational B-Spline) surface patches. To verify the validity of the developed program the numerical calculations for Wigley hull and Series 60 Cb=0.6 hull are performed and the results obtained after the numerical calculations are compared with the initial hulls.

고속 소형 어선의 기본선행 개발 (Hull form development of the high speed small fishing boat)

  • 이귀주;좌순원
    • 수산해양기술연구
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    • 제44권1호
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    • pp.68-74
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    • 2008
  • This study is concerned with the development of the basic planing hull form of small fishing boat in 25 knots high speed. A series of model test to determine the optimum performance hull form of actual fishing boat with 10 gross tonnage was carried out for 5 models made available planing hull form in the circulation water channel. Model test was performed with the resistance test to study the hydrodynamic characteristics of model ships and the sinkage and trim measurement to investigate the stability of model ships and also the wave pattern observation to analyze the effectiveness of model ships. As the result, the planing hull form of P-4 with deep V type bow can be derived as the best hull form with good performance especially in ship's resistance efficiency showing less residual resistance and sinkage and trim and the spray effect, etc..

뉴로 퍼지 모델링을 이용한 초기 주요요목 결정 및 선형 생성 (The Determination of Initial Main Particulars and a Hull Form generation Using a Neurofuzzy Modeling)

  • 김수영;김현철;이충렬
    • 한국해양공학회지
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    • 제12권3호통권29호
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    • pp.103-111
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    • 1998
  • This paper describes the initial hull form design process which generate a hull form using a neurofuzzy modeling. Neurofuzzy system is to combine the merits of fuzzy inference system and neural networks. Therefore it has structured knowledge representations as well as adaptive capacities. Initial hull form design stage is the process which generate an adoptable hull form from the limited design information and multi-decidions condidering correlations with design factors. It can be assidted efficiently by neurofuzzy system. This paper suggests two methods of an initial hull form generation using the neurofuzzy modeling and B-spline theory. and examines the usefulness of suggested method through its application examples.

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스마트 Hull 구조물의 모달 해석 및 진동 제어 (Modal Analysis and Vibration Control of Smart Hull Structure)

  • 손정우;최승복
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2008년도 춘계학술대회논문집
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    • pp.299-304
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    • 2008
  • Dynamic characteristics of smart hull structure are investigated and active vibration control performance is evaluated. Dynamic model of smart hull structure with surface bonded Macro-fiber Composite (MFC) actuators is established by analytical method. Equations of motion of the host hull structure are derived based on Donnell-Mushtari equilibrium equations for a thin cylindrical shell. A general model for the interaction between hull structure and MFC actuator is included in the dynamic model. Modal analysis is then conducted and mode shapes and corresponding natural frequencies are investigated. After constructing of the optimal control algorithm, active vibration control performance of the proposed system is evaluated. It has been shown that structural vibration can be reduced effectively with proper control input.

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스마트 Hull 구조물의 모달 해석 및 진동 제어 (Modal Analysis and Vibration Control of Smart Hull Structure)

  • 손정우;최승복
    • 한국소음진동공학회논문집
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    • 제18권8호
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    • pp.832-840
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    • 2008
  • Dynamic characteristics of smart hull structure are investigated and active vibration control performance is evaluated. Dynamic model of smart hull structure with surface bonded macro-fiber composite(MFC) actuators is established by analytical method. Equations of motion of the host hull structure are derived based on Donnell-Mushtari equilibrium equations for a thin cylindrical shell. A general model for the interaction between hull structure and MFC actuator is included in the dynamic model. Modal analysis is then conducted and mode shapes and corresponding natural frequencies are investigated. After constructing of the optimal control algorithm, active vibration control performance of the proposed system is evaluated. It has been shown that structural vibration can be reduced effectively with proper control input.

소형 해양조사 부이 Hull에 대한 설계 (Hull Structure Design of a small scale Oceanographic Buoy)

  • 손나나;박수홍
    • 한국전자통신학회논문지
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    • 제6권1호
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    • pp.123-128
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    • 2011
  • 소형스케일용 해양부이를 위한 hull설계부분을 소개한다. hull구조설계와 부이의 모든 부분을 연결하는 설계부분에 대하여 연구하였으며, 주로 부이의 hull설계내용을 순차적으로 소개한다. 전체적인 강도와 충돌저항력을 향상시키는 방법으로 부이를 지지하는 2층 및 반지름방향의 주요구조와 함께 내벽을 이용하여 설계를 수행하였다.

무리함수와 선형 특성 곡선들을 이용한 고속연안어선의 선형생성에 관한 연구 (A Study about Hull Form Generation of High-Speed Coastal Fishing Vessel using Irrational Function and Hull Form Characteristic Curves)

  • 김수영;김현철;백준명;이충렬
    • 대한조선학회논문집
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    • 제34권3호
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    • pp.96-103
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    • 1997
  • 본 연구는 고속연안어선의 선형을 전산기 내에서 효율적으로 표현하는 방법을 나타낸다. 즉, 선형을 특징짓는 선형 특성 곡선들(Hull form characteristic curves)로부터 무리함수를 사용하여 선형을 전산기 내에서 표현하였다. 그리고 선형 특성 곡선을 NURBS 곡선으로 표현하여 선형 변환을 수행하는 방법을 제시하였다.

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스마트 Hull 구조물의 동적 모델링 및 능동 진동 제어 (Dynamic Modeling and Vibration Control of Smart Hull Structure)

  • 손정우;김흥수;최승복
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2006년도 춘계학술대회논문집
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    • pp.650-655
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    • 2006
  • Dynamic modeling and active vibration control of smart hull structure using Macro Fiber Composite (MFC) actuator is conducted. Finite element modeling is used to obtain equations of motion and boundary effects of smart hull structure. Modal analysis is carried out to investigate the dynamic characteristics of the smart hull structure, and compared to the results of experimental investigation. Negative velocity feedback control algorithm is employed to investigate active damping of hull structure. It is observed that non-resonant vibration of hull structure is suppressed effectively by the MFC actuators.

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도토리와 밤 외피의 항산화 성분 및 활성 (Antioxidative Constituents and Activities of Acorn hull and Chestnut Hull)

  • 차배천;이혜원;임태진
    • 약학회지
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    • 제47권4호
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    • pp.212-217
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    • 2003
  • We have carried out the antioxidative activity of nuts species for the development of antioxidant from natural products. From our previous report, EtOAc and n-BuOH extracts of acorn hull and chestnut hull were found to have a strong antioxidative activity in various antioxidant experiment. In the continuous study, we isolated several compounds from EtOAc and n-BuOH extracts of acorn hull and chestnut hull by fractionation using column chromatography. The structures of isolated compounds were identified as catechin, naringenin and ellagic acid on the basis of their spectroscopic properties and by comparison of their physical and spectra data with published value. Antioxidative activities of catechin, naringenin and ellagic acid were measured by DPPH, ferric-thiocyanate and Rancimat method.

스마트 Hull 구조물의 동적 모델링 및 능동 진동 제어 (Dynamic Modeling and Vibration Control of Smart Hull Structure)

  • 손정우;김흥수;최승복
    • 한국소음진동공학회논문집
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    • 제16권8호
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    • pp.840-847
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    • 2006
  • Dynamic modelingand active vibration control of smart hull structure using Macro Fiber Composite (MFC) actuators are conducted. Finite element modeling is used to obtain equations of motion and boundary effects of smart hull structure. Modal analysis is carried out to investigate the dynamic characteristics of the smart hull structure, and compared to the results of experimental investigation. Negative velocity feedback control algorithm is employed to investigate active damping of hull structure. It is observed that non-resonant vibration of hull structure is suppressed effectively by the MFC actuators.