The drag-induced damping in a mooring cable due to combined first- and second-order wave excited motion of a moored vessel has been determined by statistical linearisation. A dynamic stiffness approach developed elsewhere is used to deal with the dynamics of the mooring cables. The power spectral densities of low- and wave-frequency responses are obtained which clearly show the influence of mooring line damping. The non-Gaussian probability density functions (pdf) and expected crossing rates of vessel responses and dynamic cable tensions are determined using the Kac-Seigert technique, and the influence of drag damping is highlighted.The drag-induced damping in a mooring cable due to combined first- and second-order wave excited motion of a moored vessel has been determined by statistical linearisation. A dynamic stiffness approach developed elsewhere is used to deal with the dynamics of the mooring cables. The power spectral densities of low- and wave-frequency responses are obtained which clearly show the influence of mooring line damping. The non-Gaussian probability density functions (pdf) and expected crossing rates of vessel responses and dynamic cable tensions are determined using the Kac-Seigert technique, and the influence of drag damping is highlighted.

Additional Metadata
Keywords Cable dynamics, Drag force, Equivalent linearisation, Floating platform, Mooring line, Non-Gaussian response, Second-order wave
Persistent URL dx.doi.org/10.1016/S0029-8018(99)00014-1
Journal Ocean Engineering
Citation
Sarkar, A, & Eatock Taylor, R. (R.). (2000). Effects of mooring line drag damping on response statistics of vessels excited by first- and second-order wave forces. Ocean Engineering, 27(6), 667–686. doi:10.1016/S0029-8018(99)00014-1