弱磁检测漏磁信号影响因素实验与仿真研究
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摘要
弱磁检测能够有效地发现钢筋、钢绞线等铁磁构件因锈蚀产生的结构受损;但是这些铁磁材料会因所在地点、所受地磁场磁化时间的不同,从而使其在弱磁检测中所受的地磁场强度与自身磁化程度也不同。所以,为了探究地磁场与自身磁化对采集到的漏磁信号是否存在影响,在此通过磁屏蔽与退火的方法控制地磁场与自身磁化强度两个变量,进行漏磁信号检测对比实验。为了进一步分析实验结果,采用COMSOL软件对实验进行仿真模拟。结果表明:地磁场对漏磁信号只存在数值上的影响,不会明显改变漏磁信号的变化规律;而自身磁化才是影响漏磁信号规律的主要因素。与此同时,仿真结果也与实验结果保持一致。
Weak magnetic field detection can effectively discover the structural damage caused by corrosion of ferromagnetic components such as steel bars and steel strands. However,the ferromagnetic materials will be different due to the magnetic time of the site and the geomagnetic field. Also,that will make the magnetic field intensity and the degree of magnetization different in the weak magnetic field detection. Therefore,the purpose is to explore whether the magnetic field and its own magnetization will influence the magnetic flux leakage signals. The contrast experiments of magnetic signal detection were carried out by the magnetic shielding and annealing method to control the two variables,the geomagnetic field and the demagnetizing field. To analyze the experimental results further,COMSOL software is used to simulate the experiment. The experimental results show that the geomagnetic field will not obviously influence the changing the rules of MFL( magnetic flux leakage) signal. But the self-magnetization is the main factor affecting the MFL. Meanwhile,the simulation results are also consistent with the experimental results.
Weak magnetic field detection can effectively discover the structural damage caused by corrosion of ferromagnetic components such as steel bars and steel strands. However,the ferromagnetic materials will be different due to the magnetic time of the site and the geomagnetic field. Also,that will make the magnetic field intensity and the degree of magnetization different in the weak magnetic field detection. Therefore,the purpose is to explore whether the magnetic field and its own magnetization will influence the magnetic flux leakage signals. The contrast experiments of magnetic signal detection were carried out by the magnetic shielding and annealing method to control the two variables,the geomagnetic field and the demagnetizing field. To analyze the experimental results further,COMSOL software is used to simulate the experiment. The experimental results show that the geomagnetic field will not obviously influence the changing the rules of MFL( magnetic flux leakage) signal. But the self-magnetization is the main factor affecting the MFL. Meanwhile,the simulation results are also consistent with the experimental results.
引文
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11古映莹,邱小勇,胡启明,等.电磁屏蔽材料的研究进展.材料导报,2005;19(2):53-56Gu Yingying,Qiu Xiaoyong,Hu Qiming,et al.Development of electromagnetic shielding material.Materials Review,2005;19(2):53-56
12刘兴民.关于退磁方法的讨论.宇航计测技术,2002;22(5):13-15Liu Xingmin.Discussion about demagnetization method.Journal of Astronautic Metrology and Measurement,2002;22(5):13-15
13任波.浅述退磁技术的原理及方法.洛阳理工学院学报(自然科学版),2011;21(2):64-67Ren Bo.Brief discussion on the principles and method of demagnetization technology.Journal of Luoyang Institute of Science and Technology(Natural Science Edition),2011;21(2):64-67
2郭鹏.基于弱磁探伤的钢丝绳无损检测技术试验研究.秦皇岛:燕山大学,2011Guo Peng.Experiment research on nondestructive testing for wire ropes based on weak magnetic flaw detection.Qinghuangdao:Yanshan University,2011
3刘红光,张卫民,袁俊杰,等.二维弱磁检测传感器及其应用.传感器与微系统,2007;26(5):67-69Liu Hongguang,Zhang Weimin,Yuan Junjie,et al.Two-dimension allow intensity field detecting transducer and its application.Transducer and Microsystem Technologies,2007;26(5):67-69
4刘博,刘斌,杨理践,等.管道弱磁检测技术的有限元仿真.油气储运,2015;34(7):719-722Liu Bo,Liu Bin,Yang Lijian,et al.Finite element simulation of weak magnetic detection technology for pipelines.Oil&Gas Storage and Transportation,2015;34(7):719-722
5李亚梅,唐东林,赖欣,等.储罐罐壁缺陷的低速漏磁检测研究.科学技术与工程,2016;16(15):154-158Li Yamei,Tang Donglin,Lai Xin,et al.Research on low-speed MFL testing to tank wall.Science Technology and Engineering,2016;16(15):154-158
6杨理践,耿浩,高松巍.长输油气管道漏磁内检测技术.仪器仪表学报,2016;37(8):1736-1746Yang Lijian,Geng Hao,Gao Songwei,et al.Magnetic flux leakage internal detection technology of the long distance oil pipeline.Chinese Journal of Scientific Instrument,2016;37(8):1736-1746
7刘鹏,任毅.卧式储罐漏磁内检测技术影响因素与实验分析.科学技术与工程,2014;14(14):202-205Liu Peng,Ren Yi.Horizontal tank leakage detection technology in the influence factors and experimental analysis.Science Technology and Engineering,2014;14(14):202-205
8 Wu D,Liu Z,Wang X,et al.Composite magnetic flux leakage detection method for pipelines using alternating magnetic field excitation.NDT&E International,2017;91:148-155
9 Suresh V,Abudhahir A,Daniel J.Development of magnetic flux leakage measuring system for detection of defect in small diameter steam generator tube.Measurement,2017;95:273-279
10 Liu B,He L,Zhang H,et al.The axial crack testing model for long distance oil-gas pipeline based on magnetic flux leakage internal inspection method.Measurement,2017;103:275-282
11古映莹,邱小勇,胡启明,等.电磁屏蔽材料的研究进展.材料导报,2005;19(2):53-56Gu Yingying,Qiu Xiaoyong,Hu Qiming,et al.Development of electromagnetic shielding material.Materials Review,2005;19(2):53-56
12刘兴民.关于退磁方法的讨论.宇航计测技术,2002;22(5):13-15Liu Xingmin.Discussion about demagnetization method.Journal of Astronautic Metrology and Measurement,2002;22(5):13-15
13任波.浅述退磁技术的原理及方法.洛阳理工学院学报(自然科学版),2011;21(2):64-67Ren Bo.Brief discussion on the principles and method of demagnetization technology.Journal of Luoyang Institute of Science and Technology(Natural Science Edition),2011;21(2):64-67