Estimation of Rolling Motion of Ship in Random Beam Seas by Efficient Analytical and Numerical Approaches
M. Salai Mathi Selvi , L. Rajendran , Marwan Abukhaled
Journal of Marine Science and Application ›› 2021, Vol. 20 ›› Issue (1) : 55 -66.
Estimation of Rolling Motion of Ship in Random Beam Seas by Efficient Analytical and Numerical Approaches
A steady-state roll motion of ships with nonlinear damping and restoring moments for all times is modeled by a second-order nonlinear differential equation. Analytical expressions for the roll angle, velocity, acceleration, and damping and restoring moments are derived using a modified approach of homotopy perturbation method (HPM). Also, the operational matrix of derivatives of ultraspherical wavelets is used to obtain a numerical solution of the governing equation. Illustrative examples are provided to examine the applicability and accuracy of the proposed methods when compared with a highly accurate numerical scheme.
Nonlinear damping / Steady-state roll motion / Ultraspherical wavelets / Homotopy perturbation method / Analytical solution
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