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管道是能源输送的重要手段,一旦出现损坏发生泄漏等事故会对生态和社会造成严重的后果。针对传统交流漏磁方法检测到的一维漏磁信号对缺陷识别度不高的问题,提出三轴交流漏磁检测方法,利用Ansoft Maxwell软件对管道缺陷交流漏磁检测进行三维有限元仿真,并研究其趋肤效应和提离效应。结果表明:增加漏磁场检测分量对缺陷的识别有很大的提高,当励磁频率大于1KHz时,趋肤深度达到一个稳定值,继续增加励磁频率对检测没有很大的提高。对提离效应进行分析,得到传感器提离值和磁化器提离值的对应关系,并且当传感器提离值比磁化器提离值高出0~1mm时,缺陷漏磁信号的检测比较稳定。
Piping is an important means of energy transmission. Once an accident such as a leak occurs, it will have serious ecological and social consequences. Aiming at the problem that the onedimensional MFL signal detected by traditional AC magnetic flux leakage method is not high in defect recognition, a threeaxis AC magnetic flux leakage detection method is proposed. Ansoft Maxwell software is used to simulate the threedimensional finite element analysis of AC magnetic flux leakage in pipeline defects. Study its skin effect and lift off effect. The results show that increasing the leakage magnetic field detection component greatly improves the recognition of defects. When the excitation frequency is greater than 1KHz, the skin depth reaches a stable value. Continuing to increase the excitation frequency does not greatly improve the detection. The lift-off effect is analyzed to obtain the corresponding relationship between sensor lift-off value and magnetizer lift-off value. When the lift-off value of sensor is 0 ~ 1mm higher than the lift-off value of magnetizer, the detection of flaw magnetic flux leakage signal is relatively stable.