Among compliant platforms, the tension leg platform (TLP) is a hybrid structure. With respect to the horizontal degrees of freedom, it is compliant and behaves like to a floating struture, whereas with respect to the vertical degrees of freedom, it is stiff and resembles a fixed structure and is not allowed to float freely. The greatest potential for reducing costs of a TLP in the short term is to go through previously applied design approaches, to simplify the design and reduce die conservatism that so far has been incorporated in the TLP design to accommodate for the unproven nature of this type of plattform. Dynamic analysis of a triangular model TLP to regular waves is presented, considering the coupling between surge, sway, heave, roll, pitch and yaw degrees of freedom. The analysis considers various nonlinearities produced due to change in the tether tension and nonlinear hydrodynamic drag force. The wave forces on the elements of the pontoon structure are calculated using Airy' s wave theory and Morison's equation, ignoring the diffraction effects. The nonlinear equation of motion is solved in the time domain using Newmark's beta integration scheme. Numerical studies are conducted to compare the coupled response of a triangular TLP with that of a square TLP and the effects of different parameters that influence the response are then investigated.


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    Title :

    Dynamic behaviour of square and triangular offshore tension leg platforms under regular wave loads


    Additional title:

    Das dynamische Verhalten von quadratischen und dreieckigen Offshore-Zugseilverankerten-Plattformen unter regulären Wellenlasten


    Contributors:

    Published in:

    Ocean Engineering ; 29 , 3 ; 279-313


    Publication date :

    2002


    Size :

    35 Seiten, 22 Bilder, 8 Tabellen, 13 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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