Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Tune of Hydrodynamic Coefficients Based on Empirical Formula by Using Manoeuvring Performance Indices of a Ship

선박 조종성능지수를 활용한 경험식 기반 유체력 미계수의 보정

  • Kim, Dong Jin (Korea Research Institute of Ships and Ocean Engineering) ;
  • Kim, Yeon Gyu (Korea Research Institute of Ships and Ocean Engineering)
  • 김동진 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 김연규 (한국해양과학기술원 부설 선박해양플랜트연구소)
  • Received : 2020.08.04
  • Accepted : 2020.08.18
  • Published : 2020.12.20
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Abstract

Ship's hydrodynamic coefficients in manoeuvring equations are generally derived by captive model tests or numerical calculations. Empirical formulas have been also proposed in some previous researches, which were useful for practical predictions of hydrodynamic coefficients of a ship by using main dimensions only. In this study, ship's hydrodynamic coefficients based on empirical formulas were optimized by using its free running test data. Eight manoeuvring performance indices including steady turning radius, reach in zig-zag as well as well-known IMO criteria indices are selected in order to compare simulation results with free runs effectively. Sensitivities of hydrodynamic coefficients on manoeuvring performance indices are analyzed. And hydrodynamic coefficients are tuned within fixed bounds in order of sensitivity so that they are tuned as little as possible. Linear and nonlinear coefficients are successively tuned by using zig-zag and turning performance indices. Trajectories and velocity components by simulations with tuned hydrodynamic coefficients are in good agreements with free running tests. Tuned coefficients are also compared with coefficients by captive model tests or RANS calculations in other previous researches, and the magnitudes and signs of tunes are discussed.

Keywords

Acknowledgement

본 연구는 선박해양플랜트연구소의 주요사업인 "첨단운송체의 항내 운항성능향상을 위한 축척효과를 고려한 운항제어원천기술 개발(2/5)"에 의해 수행되었습니다 (PES3410). SIMMAN 2020 Workshop에 공시선형 KVLCC2의 모형시험 데이터를 제공해주신 현대중공업과 MARIN에 감사드립니다.

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