深海阀门管线悬跨长度及湿模态涡激振动分析

Analysis of Deep Sea Valve Pipe Suspended Span Length and Wet-mode Vortex-induced Vibration

为防止发生涡激振动确定了深海阀门管线的悬跨段长度,采用ANSYS Workbench软件,利用声固耦合和流固耦合2种方法对阀门管线系统进行了模态分析,对比2种湿模态频率后发现低阶下2种方法的计算值偏差较小,高阶下具有一定的差异。为研究海流力能否引起涡激振动现象,对管线系统进行二维瞬态绕流并得到FFT转换后的升力频域曲线,在提取管线系统固有频率并进行分析后发现在一定条件下管线系统没有发生涡激振动的危险。

Considering avoiding that the vortex-induced vibration determines the length of the suspended span section of the deep sea valve,the ANSYS Workbench software is used,and acoustic-structure coupling and fluid-structure coupling are used to carry out modal analysis to the valve piping system.After comparing the two wet-mode frequencies,it finds that the calculated value of the two methods under low order is relatively small,while there’s a certain difference under high order.To research that whether ocean current force is able to cause to vortex-induced vibration,two-dimensional transient streaming is carried out the pipeline system,and lift force frequency domain carve is gained after FFT transaction.After extracting and analyzing the natural frequency of the pipeline system,it finds that there’s no risk of vortex-induced vibration in the pipeline system under certain conditions.