A novel vehicle-track coupled dynamics model with disc brake systems: modelling and validation

This study established a novel vehicle-track coupled dynamics model (VTCDM) considering the disc brake system of a high-speed train (HST). The structure parameters of each friction block are applied to compute the non-linear friction forces and torques. This more elaborate model enables detailed investigations on the coupled mechanical system excited by the brake sliding friction, wheel-rail rolling friction and track irregularity. Further, it is validated by comparing with the experimental results from the aspects of time domain, frequency domain, Poincare map and phase plane. Results indicate that the brake system substantially influences the vehicle-track system (VTS) and causes strong non-linear characteristics. Furthermore, this model can be used for tribological and dynamics-related assessment, like braking squeal and friction-induced vibration.

Automated summary

This study presents a novel vehicle-track coupled dynamics model (VTCDM) that incorporates the disc brake system of a high-speed train (HST). By considering the structure parameters of each friction block, the model accurately calculates the non-linear friction forces and torques, allowing for detailed investigations on the coupled mechanical system and its response to brake sliding friction, wheel-rail rolling friction, and track irregularity. The model is validated through comparisons with experimental results, and it is found that the brake system significantly affects the vehicle-track system (VTS) and exhibits strong non-linear characteristics. Additionally, the model can be employed for tribological and dynamics-related assessments, such as braking squeal and friction-induced vibration.