随着铁路列车速度与运量的增加, 对钢轨检测速度的要求也不断提高, 原有静态条件下的缺陷识别方法需要加以改进。为此研究了钢轨漏磁检测的速度效应。首先通过公式推导, 从理论上讨论了检测速度对漏磁信号的影响; 然后以有限元方法为基础, 在Ansoft软件中建立了研究模型, 仿真分析了不同检测速度时的信号差异, 总结得出了一些有意义的结论; 最后以裂纹的深度和宽度检测为例, 研究了检测速度对特征信号的影响规律。

With the increase of train speed and traffic density, high speed inspection for rail cracks is in great demand in these years, and the former flaw recognition methods based on static condition need to be improved. Based on the background mentioned above, the speed effect on rail magnetic flux leakage(MFL) inspection was researched. Firstly, the effect of the testing speed on the MFL signals was discussed theoretically by formulation; Secondly, the research model was established in Ansoft software by finite element method(FEM). The signal differences under various testing speeds were discussed, and some significant conclusions were summarized accordingly. Lastly, the influence rules of the testing speed on the characteristic signals were researched by the simulation examples of the depth and width recognition of the rail cracks.