STUDY ON VIBRATIONAL CHARACTERISTICS OF RAILWAY BOGIE WHEN ROLLING-STOCK RUNNING THROUGH A SWITCH

Three general models, coupling high-speed rolling stock and track system running through a switch, are established considering the elasticity of track foundation and bogie frames. The motions between wheelset and rail and the dynamic loads acting on the elastic frames are simulated in the three models. With a postprocessor code, these loads were transformed back to the FE-code, in which the stress distributions for the whole bogie frame were simulated by means of the ANSYS-code, high stressed locations were indicated, and time histories for the stresses at the locations were simulated. According to above-mentioned researching results, the simulating results of the three models are analyzed and compared, and the time histories for the simulating stresses of the bogie frame are compared with the stresses tested in the real field test. The frequency spectrums of the dynamic stresses are investigated and analyzed. Results show that ignoring the elasticity of track foundation causes the dynamic stresses result larger than the real one. However, it is inadvisable to make the model considering the elasticity of track foundation too complex. In addition, when running through a crossing vee of switch, the oscillatory frequency of the dynamic stresses in bogie frame mostly focuses between 5Hz and 17Hz. The elasticity of track foundation widens the bandwidth of oscillatory frequency of dynamic stresses in bogie frame.