Lateral Vibration Analysis Of High Speed Train Under The Air Pressure Wave

With the rapid development of China’s high-speed railway and train speed increasing, the aerodynamic effect exacerbated. Air dynamic load has brought new challenges to safety and stable operation of train With the increase of train speed, aerodynamic problems are becoming more and more important. In the tunnel across, especially in the trains intersection, dynamic loaded on the train at high speed became very obvious. It caused that the air pressure on the train intersection side surface changed very quickly. The huge impact brought adverse effect on train body structure, side windows and train body strength and train lateral stability. To solve above problems, this paper takes a certain type of CRH high speed train as the research object, analyzed the lateral vibration of train through computational fluid dynamics simulation and multi-body dynamics simulation train caused by pressure wave. The main research content of the following aspects:1. The pressure data were processed and analyzed that are measured in different conditions in the test, such as train passing through a tunnel, trains intersection in tunnel or on open track at different speed.2. The1:1model was established in Pro/E. Then the model was divided into all hexahedron meshes in ANSYS ICEM. Finally the pressure data on the train surface were calculated in ANSYS FLUNET. The calculated pressure values were compared to the real test pressure in our experiment. And repeated the second and third step until the calculated pressure values were in acceptable error range. Finally, simulation results and experimental results within6%error. The force and moment on the train were solved through compiling program UDF in Fluent,based on the verification of simulation accuracy.3. Train multi body dynamics model was established in UM software. The force and moment results calculated in (2) were used as the train dynamics model of aerodynamic load input, compared the train lateral vibration under only track irregularity and considering the aerodynamic force and moment at the same time two situations. The results show that:there is a significant increase in the influence of the train lateral acceleration and lateral stability than just with the track irregularity. In both of the intersection on open track and in the tunnel, the acceleration amplitude has a certain increase in the low frequency range below10Hz.This paper studied the lateral vibration of high-speed train under pressure wave, through the analysis of the tested pressure and the simulation. Theoretical analysis and simulation results showed that:there is a significant increase in the influence of the train lateral acceleration and lateral stability than just with the track irregularity. But in different conditions, the impact on the head train and tail train are more serious. The aerodynamic load was mainly distributed under lOHz. The research methods of this paper brings new ideas and solutions on train lateral vibration characteristics through combining train aerodynamics and train multi-body dynamics.