Previous predictions of barge motions in head seas are extended to include forces and moments on cylindrical legs in order to analyze wave-induced motions of jackup drill rigs in the transition phase while the legs are being lowered. Predicted motions for a typical jackup drill rig in head seas with legs up, half down and full down (but not touching the ocean bottom) are shown to be in good agreement with corresponding scale model test results. It was found that the major effect of the legs is to modify the inertia of the vehicle while the damping effect of the legs is small and for practical purposes can be represented by the theoretical motion-induced damping force and moment. (Author)


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    Title :

    Motions of Jackup Drill Rigs in Head Seas


    Contributors:
    C. H. Kim (author) / F. Chou (author)

    Publication date :

    1971


    Size :

    44 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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