水下悬跨输流管道流致振动响应研究

水下输流管道是油气管输的重要组成部分,海床或河床受水流的冲蚀而出现管跨后在内外流的作用下引起振动,造成水下管道的动力破坏。为此,以水下管道悬跨段为研究对象,考虑内外流体与管道间的流固耦合作用,将管跨处理成等截面的直梁模型,两端入土端的约束等效为弹性支承,采用模态叠加法对其进行动态响应研究,通过算例分析了各种参数对涡激振动特性的影响,从计算结果看出,内外流流速、压力、轴向力、管跨结构参数对管跨的动态响应具有重要影响。本文分析方法对水下管跨的动态设计和可靠性分析评估具有参考价值。

Study on dynamic responses of submarine fluid conveying pipeline under eddy stimulation

The pipeline lying on seabed or riverbed is an important part of oil and natural gas transportation.It will vibrate under internal and external flowing fluid action while appearing free span due to external water brushing.This would make the spanning pipe damaged more easily by the periodical force.Taking the spanning pipeline as an object model,simplifying it and making it be a simple beam with elastic supports on two ends,taking the fluid-structures interaction(FSI) into consideration and using the mode s...