| Reel-lay can achieve efficient installation of pipelines which diameter are less than 20 in,so it is widely used in deep-water oil and gas pipeline installation.But during Reel-lay process pipeline will withstand the cyclic bending load,resulting in large plastic deformation which may lead to local buckling.So it is important to analyze the dynamic response of the pipeline through numerical simulation.In addition,the safety of the pipeline may be affected by the existence of mechanical properties discontinuities because of welding and initial defects in geometric discontinuities.Previous studies lacked in-depth analysis of such problems,so a finite element numerical simulation of Reel-lay installation will be carried out in this paper in order to study the changes of pipeline performance.It is essential for a more comprehensive consideration of the safety and effectiveness during reeling.The main work of this paper is as follows:1.A numerical simulation of the installation process of reeling is done to analyze the contact between the pipeline and the installation equipment,and the influence of environmental loads and hull movement on the dynamic response of the pipeline has been studied.2.A local model of reeling is established and the mechanical properties of the welded part of the pipe are simulated.Numerical simulations of reeling is carried out to analyze the influence of welding on the pipe strength.3.The pipeline with geometric discontinuities is taken as the initial model,and the dynamic simulation analysis of reeling is carried out.The influence of the initial defect on the performance of the pipeline is studied,and the control variable method is used for the parameter sensitivity analysis. |
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