【摘要】 为了研究油气管道缺陷与其他漏磁参数对磁化特征的影响及永磁铁退磁的可行性,建立了基于Maxwell的仿真模型与响应面分析模型,设计了一种管内退磁机构,并开展了永磁铁退磁试验。研究结果表明:当缺陷深度一定时,半径越大,其X方向与Z方向磁通量密度也越大;当缺陷半径一定时,深度越大,其X方向与Z方向磁通量密度也越大;衬铁高度与缺陷深度对缺陷中心磁场强度有显著影响;随着外部磁场增大,钢板两端切向磁通与法向磁通极性有增强的趋势;用永磁铁退磁对钢板两端极性有一定的削弱作用,达到了较好的退磁效果。研究结果可为油气管道退磁方法研究提供参考。更多还原

【Abstract】 To study the influence of pipeline defects and other magnetic flux leakage parameters on the magnetization characteristics and the feasibility of permanent magnet demagnetization,the Maxwell-based simulation model and response surface analysis model are established. An in-pipe demagnetization mechanism is designed.Demagnetization test by permanent magnet is developed. The results show that given the same defect depth,larger defect radius results in higher magnetic flux density in the X and Z directions. Given the same defect radius,larger defect depth results in higher magnetic flux density in the X and Z directions. The height of iron liner and defect depth have significant influence on the magnetic field strength of the defect center. As the external magnetic field increases,the polarities of the tangential magnetic flux and the normal magnetic flux at both ends of the steel plate have a tendency to increase. Demagnetization using permanent magnet has a certain weakening effect on the polarities at the ends of the steel plate,and better demagnetization performance is achieved. The study can provide references for the study of pipeline demagnetization methods.更多还原