A track geometric irregularity reproduced method and its application based on 6DOF vibration test bench

It is considered to reproduce the track random irregularity on a test bench to simulate the vibration environment of the train and to test the vibration response of the whole or parts of a vehicle system. Combined with the characteristics of track geometric irregularity and the structure of the vibration test bench, a motion control method of the test bench and a method to reproduce track geometric irregularity on the test bench were studied. Based on the full-scale virtual prototype model of the test bench, the measured irregularity signals of the high-speed railway from Wuhan to Guangzhou were successfully reproduced. On this basis, the rigid flexible coupling dynamic model of a certain type of train bogie under the condition of servicing was established. Modal analysis of the bogie frame was carried out with track geometric irregularity reproduced by a virtual test bench as excitation. The analysis shows that under the excitation of track irregularity, the corresponding modes of 18 Hz, 67 Hz, 85 Hz, and 97 Hz of the bogie frame will be excited when the bogie runs at 250 km/h. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.