环境载荷下漂浮软管的疲劳寿命分析

摘要

The bonded floating hose is a key equipment for the floating production storage and o?oading unit (FPSO).The hose has a very complex structure,floating on the sea surface,subjected to wind,wave and current load. First of all,ABAQUS is used to build a finite element model,and a case under the bending moment and the internal pressure is analyzed. Secondly, the modified horizontal Morison equation and the wind load are used to describe the complex load condition. The above static analysis results are used by the FE-Safe fatigue analysis software as the input. The load spectrum is acquired by multiplying the node stress results with the corresponding load ratio. Then the life distribution contour of the hose is obtained. The calculated minimum fatigue life meets the engineering requirements. Finally, the effect of the internal pressure on the fatigue life is considered. The results show that the certain internal pressure can improve the fatigue performance of the hose.%海上漂浮软管是浮式生产储卸油装置上外输系统的关键设备.漂浮软管结构复杂且常年漂浮于海面上,极易受到风、浪、流等环境载荷的作用产生疲劳破坏而造成原油泄漏.首先,采用 ABAQUS 软件,建立了软管的有限元模型,得到了漂浮软管在弯矩和内压作用下的有限元结果;其次,采用水平方向的Morison方程和风载荷来描述漂浮软管在海面上复杂的载荷情况;再次,将静力学分析结果导入到FE-Safe疲劳分析软件中,将节点应力结果作为时间载荷历程,乘以相应的载荷倍数,得到疲劳分析的载荷谱,载入此载荷谱计算,得到了漂浮软管的寿命分布云图,其最小寿命满足工程要求;最后,分析了内压对疲劳寿命的影响,结果表明,一定大小的内压能提高软管的疲劳性能.