| Simplified Prediction Model for Vortex-Induced Vibrations of Top Tensioned Risers |
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| 作者姓名： | 薛鸿祥 唐文勇 张圣坤 |
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| 作者单位： | State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University，State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University，State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University，Shanghai 200030 China，Shanghai 200030 China，Shanghai 200030 China |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | According to the characteristics of deepwater top tensioned risers, a simplified model is presented to predict the multi-modal response of vortex-induced vibration （VIV） in non-uniform flow based on energy equilibrium theory and the exporimental data from VIV self-excited and forced oscillations of rigid cylinders. The response amplitude of each mode is determined by a balance between the energy fed into the riser over the lock-in regions and the energy dissipated by the fluid damping over the remainders. Compared with the previous prediction models, this method can take fully account of the intrinsic nature of VIV for low mass ratio structures on lock-in regions, added mass and nonlinear fluid damping effect, etc. Moreover, it is the first time to propose the accurate calculating procedure for VIV amplitude correction factor by solving energy equilibrium equation and a closed form solution is presented for the case of a riser of uniform mass and cross-section oscillating in a uniform flow. The predicted values show a reasonable agreement with VIV experiments of riser models in stepped and sheared currents.
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| 关 键 词： | 顶部拉伸立管 旋涡感应振动 预测模型 海洋工程 |
Simplified Prediction Model for Vortex-Induced Vibrations of Top Tensioned Risers |
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| XUE Hong-xiang,TANG Wen-yong,ZHANG Sheng-kun.Simplified Prediction Model for Vortex-Induced Vibrations of Top Tensioned Risers[J].China Ocean Engineering,2008,22(2):291-302. |
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| Authors: | XUE Hong-xiang TANG Wen-yong ZHANG Sheng-kun |
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| Institution: | State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China |
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| Abstract: | According to the characteristics of deepwater top tensioned risers, a simplified model is presented to predict the multi-modal response of vortex-induced vibration (VIV) in non-uniform flow based on energy equilibrium theory and the experimental data from VIV self-excited and forced oscillations of rigid cylinders. The response amplitude of each mode is determined by a balance between the energy fed into the riser over the lock-in regions and the energy dissipated by the fluid damping over the remainders. Compared with the previous prediction models, this method can take fully account of the intrinsic nature of VIV for low mass ratio structures on lock-in regions, added mass and nonlinear fluid damping effect, etc. Moreover, it is the first time to propose the accurate calculating procedure for VIV amplitude correction factor by solving energy equilibrium equation and a closed form solution is presented for the case of a riser of uniform mass and cross-section oscillating in a uniform flow. The predicted values show a reasonable agreement with VIV experiments of riser models in stepped and sheared currents. |
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| Keywords: | top-tensioned riser vortex-induced vibration lock-in simplified prediction model |
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