Abstract
Flexible risers and hoses are some of the most important components in floating production units for oil and gas.Hence, comprehensive research efforts are going on in order to understand the nature of the dynamic response of such components. Some important mechanisms in this context, are the cross-section formulations including bending stiffness and structural damping. A common analysis approach is the application of a stiffness proportional global damping matrix (Rayleigh damping). In the present paper also refined damping models are applied. The nonlinear bending stiffness of the riser and the internal friction between the different layers in the pipe structure are more realistically described in a hysteresis model. An enhanced Rayleigh damping model is also supplied where the contributions from axial- torsion- and bending-responses are separated. This shows a significant improvement of the simulation results which were compared to full scale measurements undertaken at the production and test ship “Petrojarl 1” while operating at the Oseberg and Troll Fields in the North Sea at 110 m and 330 m water depths respectively.
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