CAJ | 학술논문

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小可忽略.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.RPl05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.
재해저현과관도안장화조작과정중회산생적고축향력화고압력,공능재하대관도와격진동적영향소가홀략.본문수선기우Hamilton원리,추도병구해료간단지탱적수액장력관도자유운동방정,재차기출상이용DNv.RPl05규범평고현과와격진동향응,대현과관도수불동공능재하(특별시유효축향력화내류류속)진행계산.결과현시공능재하통과개변관도적고유빈솔래영향와격진동향응,이차유우실제내류류속일반불고,기영향교유효축향력요약.결과가이위현과관도적허용장도선취제공삼고.
During the operation and installation of offshore pipelines, high axial forces and pressures are experienced, and their effects cannot be neglected. In this article, the effect of internal flow velocity and functional loads on vortex-induced vibration (VIV) response is investigated. On the basis of the Hamilton principle, a differential equation was derived to describe the motion of a pinned-pinned tensioned spanning pipeline conveying fluid. The VIV response was calculated according to DNV-RP-F105 under different functional loads. The results showed that functional loads influence free spanning pipeline VIV response by changing the natural frequency. Internal flow velocity was found less important for VIV response than other functional load factors, such as effective axial force, because the speed in reality is not high enough to be significant. The research may provide a reference for sensitivity studies of the effect of functional loads on allowable free span lengths.