Nonlinear Dynamic of Multi-Configuration Multilayer Composite Flexible Risers in Deep Water
In order to explore the mechanical characteristics of flexible risers in offshore platform operations and provide relevant theoretical support for the safe and reliable implementation of practical engineering,based on the multilayer equivalent model and the buoyancy section equivalent optimization theory of OrcaFlex,an eight-layer unbonded carbon fiber flexible riser model is established.The static characteristics,dynamic response characteristics and motion transfer paths of four different configurations of carbon fiber composite flexible risers,including catenary type,steep wave type,slow wave type and double wave type,are compared.The influence of the double-wave flexible riser configuration on the dynamic response of deep-water riser is studied by optimizing the configuration of the buoyant section and the change of the position of the bottom point.The results show that compared with other pipe risers,the double-wave flexible risers can greatly reduce the effective suspension section and the normal motion response of the contact area.Since the total length of the two-wave buoyancy section is constant,the change in the center of gravity position of the total buoyancy section has a significant effect on the effective tension and curvature response of the suspension section and the contact section.The rational use of the double wave structure can greatly reduce the overall tension distribution level and the motion response of the contact point of the riser,thus improving the safety of the whole project and the service life of the riser.
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