| Analysis of Dynamic Characteristics of Submarine Free Spanning Pipelines by Complex Damping Method |
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| 作者姓名： | 傅强 郭海燕 杨新华 |
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| 作者单位： | CollegeofEngineering,OceanUniversityofChina,Qingdao266071,China |
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| 基金项目： | ThisprojectwasfinanciallysupportedbytheNationalNaturalScienceFoundationofChina (GrantNo .5 0 3 790 5 0 ) |
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| 摘 要： | Considering the effect of the internal flowing fluid and the external marine environmental condition, the differential equation for the vortex-induced vibration (V1V) of the free spanning pipeline is derived and is discretized by the Hermit interpolation function. The free vibration equation with the damping term is solved by the complex damping method for the natural frequency, and then the effect of fluid damping on the natural frequency of the free spanning pipeline is analyzed.The results show that fluid damping has a significant influence on the damped natural frequency of the free spanning pipeline in the lock-in state, while it has little influence when the pipeline is out of the lock-in state. In the meantime,the change of the free span length has the same effect on the damped natural frequency and the undamped natural frequency.
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| 关 键 词： | 动力学分析 自由生成管道 流动性 微分方程 人工旋涡 隐函数 |
Analysis of Dynamic Characteristics of Submarine Free Spanning Pipelines by Complex Damping Method |
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| FU Qiang,GUO Hai yan and YANG Xin hua College of Engineering,Ocean University of China,Qingdao ,China.Analysis of Dynamic Characteristics of Submarine Free Spanning Pipelines by Complex Damping Method[J].China Ocean Engineering,2004,18(3):485-491. |
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| Authors: | FU Qiang GUO Hai yan and YANG Xin hua College of Engineering Ocean University of China Qingdao China |
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| Institution: | FU Qiang,GUO Hai yan 1 and YANG Xin hua College of Engineering,Ocean University of China,Qingdao 266071,China |
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| Abstract: | Considering the effect of the internal flowing fluid and the external marine environmental condition, the differential equation for the vortex induced vibration (VIV) of the free spanning pipeline is derived and is discretized by the Hermit interpolation function. The free vibration equation with the damping term is solved by the complex damping method for the natural frequency, and then the effect of fluid damping on the natural frequency of the free spanning pipeline is analyzed. The results show that fluid damping has a significant influence on the damped natural frequency of the free spanning pipeline in the lock in state, while it has little influence when the pipeline is out of the lock in state. In the meantime, the change of the free span length has the same effect on the damped natural frequency and the undamped natural frequency. |
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| Keywords: | free spanning pipelines natural frequency complex damping fluid damping |
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