管道多单元磁轭法轴向磁化有限元分析和设计

利用有限元方法对局部管道、磁轭法磁化结构及外围空气进行了三维实体建模,通过求解计算,定量分析了线圈安匝数、铁芯截面积以及接触面气隙对管道磁化场的影响;求解了有柱状缺陷和周向缺陷时,缺陷漏磁场的分布情况。研究结果表明:磁化器安匝数越大,铁芯截面积越大,接触面气隙越小,管道磁感应强度越大;磁感应强度在缺陷处出现极值和方向变化。

FEM Simulation and Design for Pipeline Multi-Magnetizer Axial Magnetization Using Yoke Method

The 3D models of partial pipe,magnetization structure of the magnet yoke magnetization method and outer air are built using the finite element method.Through calculation,the effects of coil ampere turns,sectional area of iron core and the air gap of the contact surface to the distribution of magnetic induction field in pipe wall were quantitatively analyzed.When there were columnar defects and interstitial defects,the distribution of the magnetic leakage field was solved.The research results indicate that the more of the ampere turns,the more of the sectional area of iron core and the less of the air gap,the bigger of the magnetic flux density in pipe wall.There is a peak and change of direction in the magnetic induction field of the defects.