地磁作用下油气管道力磁耦合仿真分析与实验研究

Simulation Analysis and Experimental Study of Stress and Magneto Coupling of Oil and Gas Pipeline under Geomagnetic Effect

选取X80输油气管道作为研究对象,建立相应的磁力学模型,通过理论与实验的方法,研究地磁场环境下复杂应力-磁通量的变化规律。首先,通过COMSOL有限元仿真软件建立了X80管道模型,用Mises应力表征输油气管道不同内压荷载作用下的应力值,设置地磁场强度为50μT的背景磁场,对输油气管道模型施加不同的内压荷载,通过软件计算分析,得出输油气管道壁上磁通量信号的分布情况。然后,通过对地磁场环境下输油气管道应力-磁通量耦合实验进行分析,得出管道壁上磁通量信号随复杂应力的变化情况,并对实验数据进行分析处理。结果表明:在地磁场环境下,输油气管道的复杂应力在增大的过程中,其对应的磁通量信号也在增强,两者呈线性相关。同时,通过实验进一步验证了理论模型与仿真结果的可靠性。

Selecting X80 oil and gas pipeline as the research object,the paper established the corresponding magnetic model,and stud-ied the variation law of complex stress-magnetic flux in geomagnetic field environment by theoretical and experimental methods.Firstly,X80 pipeline model was established by COMSOL finite element simulation software.Mises stress was used to characterize the stress val-ue of oil and gas pipeline under different internal pressure loads.Different internal pressure loads were applied to the oil and gas pipe-line model by setting the background magnetic field with a strength of 50μT.The distribution of magnetic flux signal on the wall of oil and gas pipeline was obtained from the software calculation analysis.Then,through the analysis of stress-magnetic flux coupling test of oil and gas pipeline under geomagnetic field environment,the variation of magnetic flux signal on pipeline wall with complex stress was obtained,and the experimental data were analyzed and processed.The results show that in the geomagnetic field environment,with the increase of the complex stress of oil and gas pipeline,the corresponding magnetic flux signal is also enhanced,both showing linear cor-relation.At the same time,the reliability of theoretical model and simulation results is further verified by experiments.