Fatigue Lifeprediction Of Random Vibration For Bogie Suspension Parts

Antenna beam as an important of the locomotive bogie suspension parts, have played an important role in carrying the locomotive vehicle signal, the vibration fatigue strength directly affects the vehicle safety. Existing research on the fatigue life reliability of railway vehicle accessory structure has two ways: one is the experiment on the vehicle, the second is using the experiment or the finite element analysis based on the standard (such as EN61373-2010). Due to the limitation of test conditions, this article USES the finite element analysis method to the antenna beams life prediction. In the operation of the standards specified in the incentive and antenna Liang Shiji motivated by obviously not consistent, therefore, to carry out the antenna beam vibration fatigue life analysis under random excitation is of great significance to the design of the antenna beam.In this paper, using the inverse Fourier transform method on the Germen track spectrum was simulated, the feasibility and validity of this method was through comparative analysis. The comparative analysis by using the Welch method was conducted between German railway spectra of high irregularity and low irregularity and the United States sixth level spectrum and the actual measurement track irregularity spectra of Wuguang and Jingjin Railway.In this paper, the calculation was based on the whole model, establishing the finite element model of frame and beam antenna, the wheel was instead of the beam element. Applied the track irregularity auto-power spectrum and cross-power spectrum with three direction on the four wheels. The fatigue of antenna beam under the random vibration excitation was calculation by using the fatigue analysis software combine with the S-N curve.In this paper, considering the fatigue life of antenna beam under the track irregularity excitation which form the Wuguang and Jingjin Railway, and the German railway spectra of high irregularity and low irregularity and the United States sixth level spectrum. Comparative analysis of the difference between track irregularity and the influence on the fatigue life of antenna beam. Then considering the fatigue life of antenna beam under the same track irregularity excitation but with the different speed level.This study shows that, the frequency domain method can predict the vibration fatigue of antenna beam structure good, provides an effective method for railway vehicle structural fatigue life.