This paper introduces a study on ship performance in waves to consider the effects of added resistance in the early stage of hull-form design. A ship experiences a loss of speed in actual seaways, hence this study proposes the overall procedure of a new design concept that takes into account the hydrodynamic performance of ship in waves. In the procedure, the added resistance is predicted using numerical methods: slender-body theory and Maruo's far-field formulation, since these methods are efficient in initial design stage, and an empirical formula is adopted for short waves. As computational models, KVLCC2 hull and Supramax bulk carrier are considered, and the results of added resistance and weather factor for test models are discussed. The computational results of vertical motion response and added resistance of KVLCC2 hull are compared with the experimental data. In addition, the sensitivity analysis of added resistance and weather factor for KVLCC2 hull to the variations of ship dimensions are conducted, and the change of the added resistance and propulsion factors after hull form variations are discussed.
최근 선박이 대형화됨에 따라서 일반적인 해상상태에서의 배 길이에 비해 상대적으로 파장이 짧은 영역으로 집중되는데, 단파장 영역에서의 부가저항은 기존의 수치해석 기법으로는 정확하게 계산하는 데에 한계
이러한 파랑 중 부가저항 문제에서 어려운 부분은 단파장 영역에서의 부가저항 해석이다. 최근 선박이 대형화됨에 따라서 일반적인 해상상태에서의 배 길이에 비해 상대적으로 파장이 짧은 영역으로 집중되는데, 단파장 영역에서의 부가저항은 기존의 수치해석 기법으로는 정확하게 계산하는 데에 한계가 있다. 이러한 문제를 보완하기 위해서 Fujii and Takahashi (1975)는 실험을 통한 보정계수를 도입하여 수직 원기둥에 가해지는 표류력에 대한 식을 선박에 적용할 수 있도록 수정하였다.
불규칙파 중에서의 소비 마력 증가를 규칙파 중에서의 모형시험 자료를 사용하여 실험적으로 예측하기 위한 절차 (ITTC, 2011)를 제시
최근에는 선박의 운항효율에 대한 해석 절차가 여러 국제기구에 의해 제시되고 있다. ITTC(International Towing Tank Conference)는 불규칙파 중에서의 소비 마력 증가를 규칙파 중에서의 모형시험 자료를 사용하여 실험적으로 예측하기 위한 절차 (ITTC, 2011)를 제시한바 있다. 그리고 IMO 산하의 해양환경보호위원회(Marine Environment Protection Committee, MEPC)는 기상보정계수를 추정하기 위한 가이드라인 (IMO, 2012)을 제시하였고, 국제표준화기구(International Organization for Standardization, ISO)는 선박의 시운전 결과를 사용하여 선박의 속도 저감을 평가하는 가이드라인 (ISO, 2015)을 제시하였다.
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선박의 파랑 중 운항성능을 고려한 초기 선형설계에 대한 연구
大韓造船學會 論文集 = Journal of the Society of Naval Architects of Korea
v.54 no.3 = no.213
, 2017년, pp.171 - 186
(서울대학교 조선해양공학과 )
( 서울대학교 조선해양공학과 )
( 서울대학교 조선해양공학과)