Abstract
Aiming at the problem that some fatigue cracks occurred in the bogie frame of B-type metro vehicles and based on the actual stress and acceleration time history, it is found through the comparison between time and frequency domains that the main reason resulting in the fatigue cracks is that the low-frequency wheel–rail impact due to rail joints and the exceeded out-of-roundness of wheels excite the natural vibration modes of the frame structure, and produce the high-frequency resonance from the frame transoms, eventually lead to the occurrence of fatigue cracks. Based on this, the suggestions for maintenance of vehicles and track routes are put forward.
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