Vibration analysis of running wheel for straddle monorail vehicles

Abstract This article is based on the tire six component force test and wheel hub fatigue test of a certain type of straddle monorail vehicle, and analyzes the reasons for the abnormal phenomenon of the vehicle's wheel hub. Firstly, the vehicle connecting rod was calibrated in the laboratory to obtain the "force strain" coefficient of the connecting rod under tension and compression conditions. The accuracy of this calibration was verified by comparing it with the experimental results; Subsequently, the dynamic displacement of the vehicle and the strain of the connecting rod were obtained by installing displacement sensors at different positions, and the six component force data of the tire was obtained; Finally, based on the IIW standard, the fatigue strength of the wheel hub under AW0 and AW3 operating conditions was evaluated, and the dynamic stress of the wheel hub during emergency braking, the dominant frequency of the dynamic stress of the wheel hub, and the influence of polygonal wear on the dynamic stress of the wheel hub were analyzed. The results show that the maximum dynamic loads of the vertical force of the running wheel, the lateral force of the guide wheel, and the lateral force of the stabilizing wheel are all within the limit load range, and there is a certain safety margin to ensure safe operation; Under the IIW standard, there are 1 point and 3 points on the wheel hub under AW0 and AW3 working conditions that do not meet the fatigue strength criterion requirements, and there are no abnormalities in the other indicators; During emergency braking, there was no abnormal change in the dynamic stress of the wheel hub, and the polygonal wear of the tire shoulder had little effect on the dynamic stress of the wheel hub. This explains the abnormal phenomenon of the vehicle's wheel hub and provides an important reference for subsequent wheel hub design.