脉冲漏磁检测中的涡流效应  

Eddy Current Effect in Pulsed Magnetic Flux Leakage Testing

作　　者：费骏骉[1,2] 左宪章[1] 田贵云[3] 张云[1] 张韬[1] 

机构地区：[1]军械工程学院电气工程系 [2]77159部队 [3]纽卡斯尔大学电气电子与计算机工程学院

出　　处：《无损检测》2012年第2期5-10,共6页Nondestructive Testing

基　　金：河北省自然科学基金资助项目(E2008001258)

摘　　要：为了解脉冲漏磁检测中涡流效应的特点,奠定进一步分析脉冲漏磁检测信号的基础,建立了脉冲漏磁检测的有限元仿真模型,观察了检测中瞬态磁场和感生涡流的分布,分析了感生涡流特征量的特点及影响因素。结果表明,脉冲漏磁检测中,瞬态磁场和感生涡流总体上符合集肤效应并相互影响,其中感生涡流具有渗透深度浅、感应强度大的特点,涡流密度峰值时间在深度方向上有较强的分辨率。电导率和磁导率影响感生涡流的渗透深度和密度峰值时间在深度方向上的分辨率;脉冲激励上升时间常数只影响感生涡流的渗透深度,而和密度峰值时间在深度方向上的分辨率无关。In order to comprehend the characteristic of eddy current effect in pulsed magnetic flux leakage testing, this paper lays the foundation to further analyze pulsed magnetic flux leakage testing signal, builds simulating model of finite element in pulsed magnetic flux leakage testing, observes the distribution of transient magnetic field and induced eddy current in the test and analyzes and studies the features of characteristic quantity of induced eddy current and influential factors. The result shows that transient magnetic field and induced eddy current overall correspond with skin effect and affect each other in pulsed magnetic flux leakage testing. Induced eddy current has the feature of shallow penetrating depth and strong induction. Peak time of eddy current density has relative stronger resolution on depth direction. Electrical conductivity and magnetic conductivity affect the penetrating depth of induced eddy current and resolution of peak time of density on depth direction; pulsed stimulating ascendant time constant only affects the penetrating depth of induced eddy current, not relevant to resolution of peak time of density on depth direction.

关 键 词：脉冲漏磁检测 有限元仿真 瞬态磁场 涡流效应 感生涡流特征量 

分 类 号：TG115.28[金属学及工艺—物理冶金]