水中管道悬跨节段涡激力下的动力响应分析

Dynamic Response Analysis of Vortex-Induced Vibration of Suspended Section of Submerged Floating Pipeline

海流流经水中管道悬跨节段而形成涡激振动,涡激振动是趋向于增加悬浮管道应力数值、引起管道失稳、决定管道使用寿命的主要因素。将水中悬跨管段简化为简支梁并建立计算模型,在考虑流固耦合作用的基础上建立动力响应方程;利用ANSYS软件模拟水中管道的悬跨节段,分析不同模态阶数、悬跨长度和管道置水深度对管道动力响应的影响。结果表明,第一阶模态对振动位移的影响较大;管道的振动位移随着悬跨节段长度的增加而逐渐增大,随着管道置入水深的增加而逐渐减小。研究结果为水中管道的安全监测和悬跨节段的设计提供科学理论依据。

The suspended section of submerged floating pipeline is vortex-induced vibration under the effect of currents waves,which is main factor of tend to increase stress numerical,instability and service life of the pipeline. The simplified to beam and calculation model for suspended section of submerged floating tunnel is presented,on the basis of considering fluid-structure interaction,dynamic response equation is established. With the aid of ANSYS software,the finite element calculation model of the suspended section of the submerged floating pipeline is established and analysis of different modal order,suspended span length and pipeline water depth influence on dynamic response of pipeline. The results show that the first order modal is bigger influence on the vibration displacement; Pipeline vibration displacement increased with the increase of suspended span section length gradually increase,decreases gradually with the increase of pipeline in the depth of the water. Study results for submerged floating pipeline safety monitoring and design of the suspended span section provides scientific theory basis.