Hydroelastic Response Analysis of Very Large Floating Structures Including the Hydrodynamic Forces due to Elastic Motions in Waves

J. Ocean Eng. Technol. 2006;20(6):101-107.

Kim, Chuel-Hyun;Lee, Chang-Ho;Lee, Seung-Chul;Goo, Ja-Sam;

Department of Naval Architecture and Marine Systems Engineering, PuKyong National University;Department of Naval Architecture, Tongmyong University;Department of Naval Architecture and Marine Systems Engineering, PuKyong National University;Department of

탄성거동에 의한 유체력을 고려한 초대형 부유식 구조물의 유탄성응답 해석

김철현;이창호;이승철;구자삼;

부경대학교 조선해양시스템공학과;동명대학교 조선공학과;부경대학교 조선해양시스템공학과;부경대학교 조선해양시스템공학과;

Keywords: Very large floating structure, Hydroelastic response, Three dimensional source distribution method, Elastic motion

핵심용어: 초대형부유식 구조물, 유탄성 응답, 3차원 특이점 분포법, 탄성거동

Abstract

Recently, with the increase in requirements for marine development, a marine urbanism is being visualized, with more and more huge-scale structures at the scope of the ocean space utilization. In particular, a pontoon-type structure has attracted attention, since The Floating Structures Association of Japan proposed a new concept as the most suitable one of floating airports. The Very Lage Floating Structure (VLFS) is considered a flexible structure, for a quite large length-to-breadth ratio and its geometrical flexibility. The main objective of this study is to makean exact and convenient prediction about the hydro-elastic response on very large offshore structures in waves. The numerical approach for the hydro-elastic responses is based on the combination of the three dimensional source distribution method and the dynamic response analysis method, which assumed a dividing pontoon type structure, as many rigid bodies connected elastic beam elements. The established hydo-elastic theory was applied to the radiation forces caused by motions of a whole structure, formulated using the global coordinate system, which has the origin at the center of the structure. However, in this paper, we took radiation forces, occurred by individual motions of floating bodies, into consideration. The calculated results show good agreement with the experimental and calculated results by Yago.