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    Combined Statistics of First and Second Order Motions of Semi-submersibles

    Authors
    Dallinga, R.P.D., Huijsmans, R.H.M. and Pinkster, J.A. (MARIN)
    Date
    Jan 1, 1988

    Modern design methods for offshore structures are based on statistical concepts; the economy of the structure is weighed against the calculated risk of operational downtime or structural damage. These methods derive design values for the geometry and strength from a theoretical distribution of extreme values and an accepted risk level by means of statistical techniques. In the present work attention is paid to the nature of the distributions underlying the behaviour of a semi-submersible platform in irregular beam seas. Design aspects considered are the mooring loads, the roll motions and relative wave elevation under the main deck. Applying contemporary concepts for the description of the behaviour of floating structures in irregular waves the work is based on an analysis of the various frequency components in the motion response I and mooring loads. The individual components are considered with special attention to the distribution of extreme values; their overall magnitudes are compared with the results of available theoretical prediction methods. After consideration of the individual components attention is payed to the nature of the distribution of the amplitudes of the total motion response.

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    TAGS

    Manoeuvring and Nautical Studies Stability, Seakeeping and Ocean Engineering Waves, Impacts and Hydrostructural CFD Development CFD/Simulation/Desk Studies Measurements and Control Data Science Safe Operations and Human Factors Time-domain Simulations Renewables Oil and Gas Infrastructure Marine Systems Life at Sea Model Testing loads and responses motions operability simulation waves offshore engineering

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