首页 | 本学科首页   官方微博 | 高级检索  
     

漏磁检测信号轴向分量和径向分量的选择
引用本文:杜志叶,阮江军,余世峰.漏磁检测信号轴向分量和径向分量的选择[J].无损检测,2010(7):480-484.
作者姓名:杜志叶  阮江军  余世峰
作者单位:[1]武汉大学电气工程学院,武汉430072 [2]国网直流建设分公司,北京100052
摘    要:缺陷漏磁场的径向分量和轴向分量是漏磁检测中经常检测的物理量,两者之间如何选择,至今尚无定论。采用等效面偶极子模型分析了缺陷漏磁场的空间分布特点,解释了径向分量比轴向分量衰减更快的原因。结合有限元方法,研究了不同深度、宽度的二维矩形槽和不同倾角的梯形槽缺陷的漏磁场分布,分析了径向分量与轴向分量的变化特点,总结了缺陷参数变化时临界点的变化趋势。从探头设计的角度,考察了探头提离值以及缺陷参数对缺陷漏磁场信号轴向和径向分量幅值的影响,提出利用临界点作为检测分量的选取原则。

关 键 词:漏磁检测  轴向分量  径向分量  临界点

Selection of Radial and Axial Components from Magnetic Flux Leakage Signals
DU Zhi-Ye,RUAN Jiang-Jun,YU Shi-Feng.Selection of Radial and Axial Components from Magnetic Flux Leakage Signals[J].Nondestructive Testing,2010(7):480-484.
Authors:DU Zhi-Ye  RUAN Jiang-Jun  YU Shi-Feng
Affiliation:1. School of Electrical Engineering, Wuhan University, Wuhan 430072, China; 2. State Grid DC Project Construction Company, Beijing 100052, China)
Abstract:Both radial component and axial component are the favorite testing factors in the magnetic flux leakage testing( MFLT). Equivalent magnetic dipole model was taken to analyze the distribution feature of magnetic flux leakage of defects, demonstrating the fact that radial component decays more rapidly than axial component. The flux leakage due to steel pipe defects with various defect depth( 10% to 40%) and width(0. 5 mm to 20 mm) was calculated using finite element method. The sharpness angle of the notch was also taken into consideration in the calculation. The critical point, where the amplitude of radial component is equal to that of axial component, transits with various parameters of defects. The tendency of shift of critical point is discussed for the different cases. The effects of lift-off of sensor and defect parameters on amplitude of components of flux leakage were studied from sensor design. The conclusion is drawn that critical point can be used to determine which component would be pick out by one dimensional sensor in designing MFLT equipments.
Keywords:Magnetic flux leakage testing  Axial component  Radial component  Critical point
本文献已被 维普 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号