Study on the non-linear vibration and impact characteristics of composite structure of embedded track

The embedded track composite structure, composed of various polymer composites, is a specialized type of vibration- and noise-reducing track whose parameters and composition critically influence the vibration and impact dynamics experienced by trains. However, the complexity of the embedded track's structural configurations and material properties presents significant challenges for its design, modeling, and analytical processes. To address these challenges, this study first designed the embedded track structure based on stress-strain criteria and subsequently analyzed the influence of individual components on system parameters. A simulation-based predictive model was then constructed and validated through both material and system-level testing, with results verifying the model's accuracy. The calibrated model was then employed to predict the nonlinear vibration and impact behaviors of the embedded track composite structure. Key findings include: (1) the embedded track structure can be effectively divided into strain and compression strain zones, enhancing the system's modal damping ratio; (2) preloading has a limited effect on the stiffness of the embedded composite track but shows a positive correlation with the fundamental frequency range of system damping, which can be represented using Rayleigh damping; (3) the high damping characteristics of the embedded track substantially attenuate high-frequency vibrations and wheel-rail impacts, particularly improving long-wavelength effects.