Among the compliant platforms, the tension leg platform (TLP) is a vertically moored structure with excess buoyancy. The TLP is designed to behave in the same way as any other moored structure in horizontal plane, at the same time inheriting the stiffness of a fixed platform in the vertical plane. Dynamic response analysis of a TLP to deterministic first order wave forces is presented, considering coupling between the degrees-of-freedom surge, sway, heave, roll, pitch and yaw. The analysis considers nonlinearities produced due to changes in cable tension and due to nonlinear hydrodynamic drag forces. The wave forces on the elements of the pontoon structure are calculated using Airys wave theory and Morisons equation ignoring diffraction effects. The nonlinear equation of motion is solved in the time domain by Newmarks beta integration scheme. The effects of different parameters that influence the response of the TLP are then investigated.
Nonlinear coupled response of offshore tension leg platforms to regular wave forces
Ocean Engineering ; 24 , 7 ; 577-592
1997
16 Seiten, 9 Bilder, 2 Tabellen, 13 Quellen
Aufsatz (Zeitschrift)
Englisch
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