Friction-induced vibration and noise performance of high-speed train friction braking under the evolution of residual height of friction block.

The friction block height of high-speed trains decreases with service time. However, the influence of height on friction-induced vibration and noise (FIVN) is unclear. Therefore, we conducted friction braking tests of blocks with different heights. A finite element model and a numerical model were established to evaluate the structure and motion characteristics of the block and the effects of its height on FIVN. The results show that blocks with greater height exhibit greater eccentric wear, resulting in stronger FIVN. The block inclined state causes contact pressure to concentrate at the leading edge, which is the main cause of eccentric wear. The block height, the inclination angle, and the resulting eccentric wear significantly affect the braking system stability and FIVN characteristics. [ABSTRACT FROM AUTHOR]