Fatigue Lifetime Estimation of Rail Vehicle Equipment Based on Inductive Method of Random Vibration Environment

Abstract:

Aimed at the characteristics of complex vibration environment when estimating the fatigue life of rail vehicle equipment, an inductive method of random vibration environment suitable for rail vehicle equipment is proposed, and a fatigue life estimation process of rail vehicle equipment is solved based on the inductive method. Combining the vibration environment data in the parameter hypothesis test, the upper tolerance limit of the sample is estimated, and the measured spectrum and the normalized spectrum are obtained. Taking the fatigue fracture of the axle box lug of a certain type of subway vehicle as an example, the measured stress is statistically analyzed, and the measured spectrum and the normalized spectrum are used as excitation to simulate the fatigue life of the lug. The results show that compared with the fatigue result at the measured stress, the relative errors of the simulation results of the measured spectrum and the normalized spectrum are 1.8% and 4.1%, respectively, which proves that the proposed vibration environment inductive method and the fatigue life estimation method are highly reliable and can provide references for practical engineering applications.