Research on Coupling Mechanism of Multi-field Source Random Excitation of Deep-water Steel Catenary Riser
Precise analysis of the motion state of marine risers is a significant research direction in marine resource development and ocean engineering.Previous studies primarily concerned about the dynamic performance of marine risers under floating body excitation,ignoring the effect of wave loading.In view of this,a two-dimensional dynamic mathematical model was firstly estab-lished for the use of the calculation and analysis of steel catenary riser.Random wave force was numerically obtained based on JONSWAP wave spectrum and Longuet-Higgins model,while the top floating body excitation was simplified to harmonic excitation.The dynamic analysis was car-ried out on the riser applying harmonic excitation and random wave force at the same time.The results show that the effect of floating body excitation on the dynamic response of the riser is dominant than random wave force in the vast majority of cases;meanwhile,the dynamic response of the riser can be significantly increased by the wave force with high and low periods.
steel catenary riserrandom wave forcefloating body excitation
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