Recursive thoughts on the simulation of the flexible multibody dynamics of slender offshore structures

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    Abstract

    In this work, the floating frame of reference formulation is used to create a flexible multibody model of slender offshore structures such as pipelines and risers. It is shown that due to the chain-like topology of the considered structures, the equation of motion can be expressed in terms of absolute interface coordinates. In the presented form, kinematic constraint equations are satisfied explicitly and the Lagrange multipliers are eliminated from the equations. Hence, the structures can be conveniently coupled to finite element or multibody models of for example seabed and vessel. The chain-like topology enables the efficient use of recursive solution procedures for both transient dynamic analysis and equilibrium analysis. For this, the transfer matrix method is used. In order to improve the convergence of the equilibrium analysis, the analytical solution of an ideal catenary is used as an initial configuration, reducing the number of required iterations.
    Original languageEnglish
    Article number012029
    JournalIOP Conference Series: Materials Science and Engineering
    Volume276
    DOIs
    Publication statusPublished - Dec 2017
    EventFirst Conference of Computational Methods in Offshore Technology 2017 - Stavanger, Norway
    Duration: 30 Nov 20171 Dec 2017
    Conference number: 1
    http://www.ux.uis.no/COTech/

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