深水细长柔性立管涡激振动响应形式判定参数研究

Study on the parameters for determining response types of long flexible riser undergoing vortex-induced vibration in deepwater

利用有限元数值模拟方法研究了深水细长柔性立管在正弦形式涡激升力作用下的动响应,并通过量纲分析结合函数拟合方式给出了判定立管涡激振动响应形式的无量纲参数的表达式和临界值,该参数与系统阻尼(包括流体阻尼和结构阻尼)、结构模态阶数及结构长度等有关。在实际海洋工程中,当设计或监测人员在预测立管的涡激振动响应时,可以先利用本文方法判定振动响应形式,然后根据响应形式选择合适的预报模型。

The dynamic response of long flexible riser undergoing vortex-induced vibration is studied by using finite element numerical simulation,and provide the expression and critical value of dimensionless parameters for determining response types of long flexible riser undergoing vortex-induced vibration in deepwater.The parameter is correlated with system damp（including liquid damp and structure damp）,structure modal order number and structure length.In practice of offshore engineering,the designer could confirm vortex-induced vibration response through selecting an appropriate prediction model based on the response types determined by above method.