Polygonal Wear Mechanism of High-Speed Train Wheels Based on Lateral Friction Self-Excited Vibration

• Published in: Machines (Basel) 2022-08, Vol.10 (8), p.608
• Main Authors: Dong, Yahong, Cao, Shuqian
• Format: Article
• Language: English
• Subjects: Analysis; Friction; friction self-excited vibration; High speed rail; High speed trains; Hopf bifurcation; mechanism; polygonal wear of wheel; Polygons; Railroad wheels; Velocity; Vertical forces; Vibration; Wear mechanisms; Wheels
• ISSN: 2075-1702; 2075-1702
• DOI: 10.3390/machines10080608

This work details research on the formation mechanism of wheel polygonalization in high-speed trains and its effect factors by numerical modeling in order to prevent the increasingly prevalent problem of wheel polygonal wear. The lateral self-excited vibration model of a wheel was developed using the LuGre friction model and self-excited vibration theory. The properties of wheel self-excited vibration and the crucial condition of Hopf bifurcation were investigated; the process of wheel polygonal wear was simulated and the results were validated using field tracking data. The results demonstrated that periodic self-excited vibration generated by Hopf bifurcation is a required condition for polygonal wheel attrition at a given speed. The wheel’s polygonal wear has the following characteristics: “Constant speed—Self-excited—Fixed frequency—Divisible.” The order of the polygon is determined by the ratio of the wheel lateral self-excited vibration frequency to its rotational frequency. Wheel polygonal wear was caused by the vertical dynamic force of the wheel rail. The findings of the study can serve as a theoretical foundation for the prediction and reduction of wheel polygonal wear.