Deep-water Riser Hydrodynamic Analysis And Suppression

In recent years,with the amount of land and shallow water oil decline,People have to pay attention to deep-sea mining.Riser system is an important and weakest component in the marine engineering.How to design deep-water risers to meet the requirements for deep water exploration is the primary problem to solve.The thesis is divided into five parts to introduce and analysis the deep water riser.The first part is mainly from the need for study deep water risers,the mechanical problem of deep water risers and Research of deep water risers at home and abroad to carry out a general introduction.The second part is from the basic wave theory to discuss the basic equation and its derivation of the linear and stokes wave theory.It is introduce calculating wave forces method of small and medium-sized marine engineering components.While calculating of wave,we introduce the Morison equation and the selection of wave theory and drag and inertia coefficient.The third part introduce the dynamic response probl.era solving of TTR with wave and current from the theory.Through the establishment of the mechanical model and equations and the use of vibration mode superposition method complete the solution.The fourth part use ABAQUS/AQUA analysis the dynamic of fop tensioned riser with different depth water.With 1500m water depth we add buoys on the top tensioned riser and assess the effects with different tension ratio and diameter of buoys.Finally we give reasonable ratio and diameter of buoys.Partâ…¤use the ABAQUS/AQUA analysis expansion bend of JZ93W platform,and propose need to install the bending component for the existence mechanical issues of flexible joints.Through evaluation the effect of bending component,and ultimately prove capable of bending component that can reduce the stress concentration and eliminate the over-bending phenomenon of flexible joint.