当深海立管自身的固有频率与由立管的顶张力、自重以及波浪共同作用下产生的振动频率相近时，立管会发生耦合共振，导致立管的损伤甚至失效。采用数值模拟的方法研究了立管的边界条件、本身物理参数和顶端张力等因素对立管固有频率的影响。在Abaqus软件中建立了简化的立管模型，并比较、分析了立管在3类不同边界条件下的立管振动特性。然后，在第3类边界条件的基础上，分析了上述因素对立管1阶固有频率的影响。最后，基于上述研究工作，得出结论。
Deep-sea risers work in a complex marine environment. Vortex-induced vibration occurred when the vibration frequency gets close to the riser's natural frequency, it would caused risers' damage or even failure. By using the numerical simulation method, the effects of different factors (such as boundary condition, physical parameters of risers and top tension) on natural frequency of risers were researched. Firstly, a simplified riser model was established in the finite element software-Abaqus, and the vibration characteristics of risers' under three kinds of different boundary conditions were analyzed. Then based on the third boundary condition, the effects of above factors on natural frequency of risers were considered. At the end of this paper, based on the above research work, some meaningful conclusions were drawn.
2018,(): 70-74,113 收稿日期：2017-02-20
DOI：10.3404/j.issn.1672-7649.2018.01.012
分类号：P751
基金项目：浙江省自然科学基金资助项目（Y14E090034，Y13F020140）；上海交通大学海洋工程国家重点实验室开放课题资助项目（1516）；卫星海洋环境动力学国家重点实验室开放基金资助项目（SOED1706）
作者简介：孔令滨(1992-),男,硕士研究生,主要从事海洋工程流体力学及海洋计量技术研究
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