Prediction of Ground Vibration Generated by Vertical Track Irregularity Using 2.5D FEM

摘要

The track irregularities have been coupled into 2. 5D finite element model in the wave-number domain. At present ,the smooth r track could only be calculated but the track irregularities en -danger the running safety and stability of the trains. The r car body has been simplified into four mu -tual independence wheels with secondary suspension in the Car -track-ground model. r The embankment and ground were presented by employing a 2. 5-dimensional finite element method. As an external force, the r dynamic wheel -rail forces will be eliminated for stiffness matrixes coupled in the wave-number domain. The dynamic response r of the ground surface in the wave -number domain will be translated into time domain by IFFT. Frequency of track r irregularities was a dominant frequency for train vibration and it would be greater as the speed grows.