Vortex-induced vibration analysis of flexible suspended riser based on wake oscillator model
To analyze the vortex-induced vibration response characteristics of flexible riser in deep-sea mining,an efficient treatment method for special boundaries is proposed.Based on the Euler beam model and the wake oscillator model,combined with the finite difference method,the effects of different boundary conditions,in-termediate silo mass and ocean current shear parameters on the vortex-induced vibration of deep-sea mining ris-ers are systematically studied.The results show that the bottom of the suspended riser will produce a large dis-placement.Compared with the traditional hinged riser at both ends,the suspended riser will excite a higher-or-der vibration mode under the same excitation,from the original 5-order mode to the 6-order mode.As the mass of the intermediate silo increases,the dominant mode of the riser vibration will decrease.Under the same mode,the bottom displacement of the suspended riser gradually decreases from 0.460 to 0.405.When the mode is converted,the root mean square of the bottom displacement will increase rapidly from 0.405 to 0.413.The bottom displacement shows a fluctuating trend with the increase of uniform flow velocity.In a certain range of flow velocity,the displacement changes linearly with the flow velocity.As the shear parame-ter increases,the displacement at the bottom of the riser gradually decreases in the same mode.When the mode is converted,the bottom displacement will increase.
deep-sea miningflexible suspended riservortex-induced vibrationwake oscillator model
万方数据
维普
