Research on Lateral Vibration Coupling Mechanism of a High-Speed Train Based on Singular Coefficients

The lateral vibration coupling mechanism is the basic law describing the current vibration behavior of a high-speed train. The main reason is that there are design defects in the ICE3 bogie prototype. Therefore, the passenger dedicated line is not a necessary and sufficient technical condition for ensuring the stability and safety of high-speed railway operation. Based on the previous research, this article further develops theoretical demonstration and experimental verification of the lateral vibration coupling mechanism of the high-speed train. According to the concept of system stiffness and the statistical characteristics of Gaussian process, a new concept of singular coefficient is proposed to describe non-stationary and non-Gaussian processes. Combined with the quality vibration tracking test of a high-altitude vehicle, the conclusions obtained are in good agreement through the experimental testing and the dynamic simulation. The application of the singular coefficient further gives three conditions for determining the lateral vibration coupling mechanism of the high-speed train, namely, sufficient excitation energy, vibration transmission medium, and possibility of coupling resonance. Aiming at the influence of high-order modal interception and residual force of flexible body, the new concept of singular coefficient is applied. The rigid-flexible coupling simulation reflects the main statistical characteristics of non-stationary and non-Gaussian processes and reveals the current lateral vibration coupling mechanism of the high-speed train.