Dragged surge motion of tension leg platforms and strained elastic tethers

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Dragged surge motion of tension leg platforms and strained elastic tethers

Hsien Hua Lee / Wang, P.W. / Lee, C.P.

An analytical solution is presented for the dynamic behavior of both the platform and tethers in the tension leg platform system when the platform is subjected to the wave-induced surge motion and the flow-induced drag motion. Along with the analysis the coupling problem of a two-dimensional tension leg platform interacting with a monochromatic linear wave train in an inviscid and incompressible fluid is being considered. The scattering problem and radiation problem are first solved independently and then combined together to resolve for all unknowns. The dynamic behavior of the platform and tethers was further solved based on these solutions. The material property and the dimensional effect for the tether incorporated in the tension leg platform system are both taken into account in the analytical analysis. Corresponding to the variation of material properties and tether dimensions, it was found that the dynamic behavior of both the tether of tension leg platform and the platform itself is closely related to the material property and the dimension of the tether.