Modification of friction block connection for improving the tribological behavior of high-speed train braking interface

Abstract

This work aims to improve interface tribological behavior by modifying the friction block connection. The effectiveness of this approach and its underlying mechanisms are evaluated through friction braking test and finite element analysis (FEA). A finite element model (FEM) was established based on the main structure and material parameters of the high-speed train braking performance simulation test setup. The Achard wear formula was used to adequately run-in the friction block. Using a restart analysis to inherit the model post run-in, complex eigenvalue analysis (CEA) and implicit dynamic analysis (IDA) were conducted. Results indicate that the disc spring deformation significantly affects tribological behavior and friction-induced vibration and noise (FIVN) via regulating the contact state at the braking interface. Inappropriate deformation of the disc spring can lead to severe eccentric wear of the friction block, exacerbating the tribological behavior at the braking interface and inducing the brake system to generate high-intensity FIVN. Therefore, rational design of disc spring connection is an effective strategy for improving interface tribological behavior, but the disc spring connection design must provide it appropriate deformation capability. This is essential to ensure that the braking interface exhibits favorable contact state, thereby improving tribological behavior.