An Analysis Method for Deepwater TTR Coupled Vibration of Parameter Vibration and Vortex-Induced Vibration

The long slender cylinder often suffers the high Reynolds number in ocean environment, and its dynamic characters and vortex shedding modes vary with a number of mechanical, physical and fluid–solid parameters.Considering the vertical vibration, caused by floating platform, of top tensioned riser (TTR), an analysis method for the coupled vibration of parameter excited vibration and vortex-induced vibration is presented in this paper. With the section rotation and shear deformation due to the bending large displacement of TTR, a coupled vibration model of parameter excited vibration and vortex-induced vibration is put forward. And the vortex-induced vibration (VIV) of a TTR for 1500m water depth is analyzed based on the model. The results show that the vertical vibration caused by floating platform increases transverse vibration displacement of TTR,especially in in-line direction.