Proceedings of the Korean Institute of Navigation and Port Research Conference (한국항해항만학회:학술대회논문집)
- 2009.10a
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- Pages.239-240
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- 2009
Study for the Nonlinear Rolling Motion of Ships in Beam Seas
- Long, Zhan-Jun (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
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Lee, Seung-Keon
(Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
- Jeong, Jae-Hun (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
- Lee, Sung-Jong (Dept. of Naval Architecture and Ocean Engineering, Pusan National University)
- Published : 2009.10.22
Abstract
Vessels stability problems need to resolve the nonlinear mathematical models of rolling motion. For nonlinear systems subjected to random excitations, there are very few special cases can obtain the exact solutions. In this paper, the specific differential equations of rolling motion for intact ship considering the restoring and damping moment have researched firstly. Then the partial stochastic linearization method is applied to study the response statistics of nonlinear ship rolling motion in beam seas. The ship rolling nonlinear stochastic differential equation is then solved approximately by keeping the equivalent damping coefficient as a parameter and nonlinear response of the ship is determined in the frequency domain by a linear analysis method finally.