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.
Effects of mooring line drag damping on response statistics of vessels excited by first- and second-order wave forces
Einfluß des Strömungswiderstands des Ankertaus auf die Dämpfung der seegangsbedingten Schwingungsbewegung einer Boje
Ocean Engineering ; 27 , 6 ; 667-686
2000
20 Seiten, 11 Bilder, 19 Quellen
Article (Journal)
English
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