Simulation on high speed rail magnetic flux leakage inspection

摘要

Based on the background of high speed rail, this paper researches the speed effect on rail magnetic flux leakage (MFL) inspection and the recognition of rail oblique cracks by the finite element method (FEM). Firstly, the effect of the testing speed on the MFL signals is discussed theoretically by formulation; secondly, the research model is established in Ansoft software; thirdly, the numerical analyses are performed detailedly, which include the effects of testing speeds on MFL signals, the recognition of depth and width of rectangle crack with speed effect, the MFL signal differences between oblique crack and rectangle crack, the recognition of depth and width of oblique cracks, the recognition of several parallel oblique cracks, etc. The simulation conclusions could provide guidance for the further experimental research.