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손상된 선박의 구난 기술 및 안전 예항에 관한 연구(4)
손경호(K.H. Sohn),이상갑(S.G. Lee),최경식(K.S. Choi),김용기(Y.K. Kim) 한국항해항만학회 1998 한국항해항만학회 학술대회논문집 Vol.2 No.2
This paper presents a brief outline of dynamic stability of damaged ship in rough, beam wind and waves. The one degree-of-freedom, linear roll equation is adopted with the effects of damage fluid and external forces, but without the effect of sloshing. We evaluate the dynamic stability in terms of capsizing probability based on energy balance mechanics and risk analysis, the method of which was proposed by Umeda [2] to the high speed crafts. As a result, we can predict the dynamic stability quantitatively according to sea state, operating and damage conditions.
액체 화물창내의 SLOSHING 고유주기 산정에 관한 연구
신장용(J.R. Shin),최경식(K.S. Choi),강신영(S.Y. Kang),김현수(H.S. Kim) 한국해양공학회 1994 韓國海洋工學會誌 Vol.8 No.2
Recently in the design of super tankers or LNG carriers which transport a large amount of liquid in the cargo holds, the structural damage due to liquid sloshing becomes an important problem. The impact pressure from sloshing is most violent when the liquid motion of a partially filled tank is in resonance with the motion of a ship. In this paper the sloshing natural periods in liquid cargo tanks are estimated for partially filled tanks with various geometries. Especially the sloshing periods of baffled tanks which are often installed to reduce liquid motion and sloshing forces are calculated. A variational method is adopted to analyze the baffled tank of arbitrary filling depth of liquid. In this approach the liquid domain is divided into several subdomains in which the analytic solutions are presented. In consideration of abrupt shape change due to baffles, the kinetic and potential energy are calculated from the velocity potentials in each subdomain. By minimizing the Hamilton's functional, the sloshing natural periods are estimated and the results are compared with experimental and numerical results.