Abstract:Arranging buoyancy modules is an important way to reduce top tension remand of deep-sea riser and reduce vortex-induced vibration fatigue damage, so vortex-induced vibration response of riser with buoyancy modules is studied here to provide a reference for theory and practical engineering application. Based on the experimental data of two-degree-of-freedom forced vibration of a rigid cylinder and the principle of energy conservation, a frequency domain prediction model of vortex-induced vibration of a top-tensioned riser with buoyancy modules was established to study effects of different buoyancy module coverage on vortex-induced vibration. In order to suppress fatigue damage caused by vortex-induced vibration, layout of buoyancy modules was studied. It is found that staggered distribution of buoyancy modules can effectively reduce the riser fatigue damage, while full coverage of buoyancy modules will increase fatigue damage. Vortex-induced vibration response of riser should be controlled by both the riser and the buoyancy modules to reduce vibration and fatigue damage, or it should be controlled by the buoyancy modules to reduce response mode order. Meanwhile, coverage of buoyancy module in high velocity region should be reduced to control the structure energy input to avoid excessive displacement response.
Keywords:Top-tensioned Riser; Buoyancy Module; Vortex-Induced Vibration; Cross-flow and In-line Direction; Frequency Domain Prediction
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