海洋立管的模态及参数敏感性分析

为分析海洋立管受不同形式的轴向张力作用时的模态求解问题,用哈密尔顿原理建立理论模型,讨论模态的计算方法,并分析相关参数对结果的影响。结果表明,在相同的张力因子下,随着立管长度增大其固有频率主要受张力的控制;在深水中因表观重力引起的沿轴向张力的线性变化不可忽略,对频率和振型都有重要影响,张力因子的增大使频率提高,这种影响对结构长度变化敏感;频率随附加水质量系数的增大而降低。

Modal and Parameter Sensitivity Analysis of Risers in Deepwater

To solve the vibration modals of risers with different axial tension,Euler-Bernoulli beam theory was used to model risers,the calculate method was developed and the parameter sensitivity was discussed.Numerical results illustrate that the frequency of slender risers is mainly controlled by axial tension;linear changed tension caused by apparent gravity along the axial is not negligible,and it has an important influence on the modal;the frequency is increased with the larger tension factor,and this impact is sensitive to the length;the frequency is reduced with the increase of additional water mass coefficient.