Research on Inversion Arithmetic of Crack Shape in Alternating Current Field Measurement
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摘要: 针对交流电磁场检测(ACFM)智能可视化虚拟样机开发的需要，考虑到感应线圈测量精度和电磁场的分布特性，选取了裂纹反演的特征信号，确定了描述裂纹外形信息的样本特征向量，分析了裂纹尺寸反演的计算方法，采用数值模拟方法弥补了由于试验条件限制而无法对大量任意形状裂纹进行试验研究的不足，对多种不规则裂纹上方的磁场分布情况进行了仿真计算，分析了缺陷外形对于检测信号的影响，在此基础上提出了磁场信号与裂纹形状之间的相似性，研究了相似性内在机理并利用相似性建立了裂纹外形反演算法，经试验证明该算法是有效的。Abstract: To meet the need of developing the smart visualized virtual machine about alternating current field measurement technique, the characteristic signals of the electromagnetism are picked up among those disturbing electromagnetic signals. The information of the longth and depth of crack is described by three characteristic vectors. The numerical simulation is presented as the complement of experiments. Many kinds of distributions of the magnetic field above the arbitrary shape cracks are achieved by the simulating calculation. The influence of cracks shape on the precision in crack sizing is analyzed on the basis of those calculaion results, and the similarity in shape between the magnetic field signal and the crack is also detected by the simulating calculation. Furthermore, the inversion arithmetic of crack shape is proposed by studying the principle of the comparability, which has been proved by the experiment.
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