钢缆在线检测时,钢缆与检测设备之间相对运动,钢缆中产生的涡流严重影响缺陷定量检测的精度.采用电磁场有限元专业软件,选择二维轴对称柱坐标系,创建钢缆缺陷检测结构的几何实体模型,利用瞬态求解器数值计算了磁路磁力线分布和钢缆截面涡流分布.研究发现:随着速度的增加,磁路磁力线密度逐渐增加,涡流密度先增加后减小,磁力线和涡流的扩散方向与速度方向有关.研究结果与国外发表文献中的实验结果相符合,验证了有限元仿真在钢缆在线检测中的有效性.%when the steel cable is online tested,the cable and detection instrument make relative movement,and the eddy current arising in the cable severely affects the accuracy of the flaw quantitative detection. The professional electromagnetic finite element software is adopted, two-dimensional axisymmetrical pole coordinate is chosen, geomeric full-scale model of the steel cable flaw testing structure is built, and magnetic circuit flux line distribution and eddy current distribution are numerically simulated using the transient solver. The analysis results show that, with the increasing of the velocity, magnetic circuit flux line density adds, the eddy current density first increases and then decreases, and diffusion direction of flux line and eddy current has something to do with the direction of the velocity. Results are in agreement with experiment results of foreign public publication papers,and it proves validity of the application of finite element simulation in steel cable online testing.
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