Stability and Dynamic Response of Railroad Tracks under Stochastic Loads. Volume 2. Dynamic Response

摘要

A simple five degree freedom lumped-mass train model is used with a three dimensional rail finite element to develop a train/track interaction model. The model is used to study the dynamic response of the railroad track under moving loads. The resistance of the track components is included in the model by linear elastic springs. A numerical procedure is used to solve the resulting equation of motion. The train/track interaction model presented here provides flexibility by allowing the comparison of response under different loading conditions. Reasonable results can be obtained for the vertical response of the track and the stress distribution in the track at operating speeds. The effect of track irregularities and defects can also be investigated with the model. These defects have been shown to cause larger deformations of the track and higher contact stresses than other causes of track degradation.