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在海底悬跨管道安装和操作过程中会产生的高轴向力和高压力,功能载荷对管道涡激振动的影响不可忽略.本文首先基于Hamilton原理,推导并求解了简单支撑的输液张力管道自由运动方程,在此基础上利用DNV-RP105规范评估悬跨涡激振动响应,对悬跨管道受不同功能载荷(特别是有效轴向力和内流流速)进行计算.结果显示功能载荷通过改变管道的固有频率来影响涡激振动响应,而且由于实际内流流速一般不高,其影响较有效轴向力要弱.结果可以为悬跨管道的许用长度选取提供参考.
The high axial force and high pressure which will be produced during installation and operation of subsea suspended pipeline can not neglect the effect of functional load on the vortex induced vibration of the pipeline.In this paper, based on the principle of Hamilton, the simple support of the free-flowing tension pipe is derived and solved Based on this, DNV-RP105 is used to evaluate the vortex-induced vibration response of suspended span, and the calculated load on the suspended span (especially the effective axial force and internal flow velocity) is calculated. The results show that the functional load is changed by changing the pipe The natural frequency is affected to the vortex-induced vibration response, and because the actual flow velocity is generally not high, the effect is weaker than the effective axial force.The results can provide reference for the selection of the allowable length of the suspended pipeline.