Many ship accidents and casualties are caused by large freak ocean waves. Traditionally, the strength of ships against freak waves is assessed by means of ultimate strength evaluation, assuming quasi-static conditions, but the nonlinear dynamic structural response of ships to freak waves should be considered as well. This paper describes how the strength of a ship can be evaluated in terms of its nonlinear vertical bending moment (VBM). Linear dynamic VBM of a ship, which is derived from hydrodynamics, is calculated using a time-domain strip theory code under freak wave conditions, and the nonlinear dynamic VBM, which is dependent on structural nonlinearity, is calculated using a combination of quasi-static and dynamic nonlinear analyses based on the finite element method (FEM). The nonlinear and linear VBMs are then compared to assess how they differ. Then, the influence of freak wave height and wave speed on the VBMs and deformation is studied.
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February 2015
Research-Article
Nonlinear Dynamic Response and Structural Evaluation of Container Ship in Large Freak Waves
Weiqin Liu,
Weiqin Liu
1
Department of Systems Innovation,
School of Engineering,
e-mail: liuweiqin_123@sina.com
School of Engineering,
The University of Tokyo
,7-3-1 Hongo
,Tokyo 113-8656
, Japan
e-mail: liuweiqin_123@sina.com
1Corresponding author.
Search for other works by this author on:
Katsuyuki Suzuki,
Katsuyuki Suzuki
Department of Systems Innovation,
School of Engineering,
e-mail: katsu@race.u-tokyo.ac.jp
School of Engineering,
The University of Tokyo
,7-3-1 Hongo
,Tokyo 113-8656
, Japan
e-mail: katsu@race.u-tokyo.ac.jp
Search for other works by this author on:
Kazuki Shibanuma
Kazuki Shibanuma
Department of Systems Innovation,
School of Engineering,
e-mail: shibanuma@struct.t.u-tokyo.ac.jp
School of Engineering,
The University of Tokyo
,7-3-1 Hongo
,Tokyo 113-8656
, Japan
e-mail: shibanuma@struct.t.u-tokyo.ac.jp
Search for other works by this author on:
Weiqin Liu
Department of Systems Innovation,
School of Engineering,
e-mail: liuweiqin_123@sina.com
School of Engineering,
The University of Tokyo
,7-3-1 Hongo
,Tokyo 113-8656
, Japan
e-mail: liuweiqin_123@sina.com
Katsuyuki Suzuki
Department of Systems Innovation,
School of Engineering,
e-mail: katsu@race.u-tokyo.ac.jp
School of Engineering,
The University of Tokyo
,7-3-1 Hongo
,Tokyo 113-8656
, Japan
e-mail: katsu@race.u-tokyo.ac.jp
Kazuki Shibanuma
Department of Systems Innovation,
School of Engineering,
e-mail: shibanuma@struct.t.u-tokyo.ac.jp
School of Engineering,
The University of Tokyo
,7-3-1 Hongo
,Tokyo 113-8656
, Japan
e-mail: shibanuma@struct.t.u-tokyo.ac.jp
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received October 25, 2013; final manuscript received August 27, 2014; published online October 3, 2014. Assoc. Editor: Thomas E. Schellin.
J. Offshore Mech. Arct. Eng. Feb 2015, 137(1): 011601 (9 pages)
Published Online: October 3, 2014
Article history
Received:
October 25, 2013
Revision Received:
August 27, 2014
Citation
Liu, W., Suzuki, K., and Shibanuma, K. (October 3, 2014). "Nonlinear Dynamic Response and Structural Evaluation of Container Ship in Large Freak Waves." ASME. J. Offshore Mech. Arct. Eng. February 2015; 137(1): 011601. https://doi.org/10.1115/1.4028506
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