Stick-Slip Characteristic Analysis of High-Speed Train Brake Systems: A Disc-Block Friction System with Different Friction Radii

Inspired by the difference in the friction radii of the pads from the high-speed train brake system, stick-slip experiments for a disc-block friction system with different friction radii were carried out via a test device. Based on the test results, the stick-slip vibration characteristics of the disc-block friction system with variation in the friction radius were analyzed, and the corresponding Stribeck model parameters in exponential and fractional forms were identified. The experimental results show that with an increase in the friction radius the vibration amplitude first increased and then decreased and the frequency of stick-slip vibration increased. The identified Stribeck model parameters show that the decay factors increased, the static friction coefficient decreased, and the dynamic friction coefficient decreased first and then increased as the friction radius increased. Moreover, the identified Stribeck model in an exponential form can more accurately reflect the stick-slip characteristics of a disc-block friction system than the model in a fractional form. It can be further applied in the investigation of the dynamic behaviors of high-speed train brake systems.

Automated summary

Stick-slip experiments were conducted on a disc-block friction system with different friction radii using a test device. The results analyzed the vibration characteristics and identified the corresponding Stribeck model parameters. The results showed that the vibration amplitude initially increased and then decreased with an increase in the friction radius, while the stick-slip vibration frequency increased. The identified Stribeck model parameters indicated an increase in decay factors, a decrease in static and dynamic friction coefficients with an increase in the friction radius. Furthermore, the exponential form of the Stribeck model accurately reflected the stick-slip characteristics of the disc-block friction system compared to the fractional form. This study has significant implications for the investigation of high-speed train brake systems.