Research on lateral vibration coupling mechanism of high-speed train based on singular coefficients

Abstract

The lateral vibration coupling mechanism is the basic law of the current vibration behavior of high-speed train. The main reason is that there are design defects in the prototype of ICE3 bogie. 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 the theoretical demonstration and experimental verification of the lateral vibration coupling mechanism of 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 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 high-speed train, namely sufficient excitation energy, vibration transmission medium and coupling resonance possibility. 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 high-speed train.