Analysis Of High Frequency Vibration Of High-Speed Train

ABSTRACT:Along with the fast development of high-speed railway, problems about high-frequency vibration of the high-speed train are more and more concerned. The high-frequency vibration influences ride comfort, damages components of vehicle-track, has important effect on the security and reliability of high-speed train. This paper studies the high-frequency vibration problem based on vehicle-track coupling dynamics model and numerical integration method.The main content about this paper as the following:1. In order to better characterize the wheel-rail interaction at high-speed train, a vehicle-track coupling dynamics model is developed. In vehicle-track coupling dynamics model, a Timoshenko beam is used to imitate rails. The wheel-rail creep forces are calculated by Shen-Hedrick-Elkins'model. A new numerical integration method is used to simulate the vehicle-track coupling dynamics model.2. For the purpose of simulating high speed train operational aspect, this paper enactment the train running on rail with different rail dipped joint total angle and different speed. The wheel forces, derailment coefficient and reduction rate of wheel load of the train are calculated. The threshold of dipped joint total angle of different speed trains is given. In order to evaluate the influence of the high-frequency vibration on the train, this paper calculated the PSD of the wheel force, wheel acceleration and bogie acceleration.3. Similarly, the threshold of wheel flat length of different speed trains is given. In order to evaluate the influence of the high frequency vibration on the train, this paper calculated the PSD of the wheel force, wheel acceleration, bogie acceleration and car-body acceleration4. In order to get the influence about the track irregularity with short wave-length to the high speed train, a model is built by using SIMPACK. The results suggest that the shorter of the short wave-length, the higher of the car-body acceleration dominant frequency.