Comparisons between beam and continuum models for modelling wheel-rail impact at a singular rail surface defect

Abstract A singular rail or wheel surface irregularity, such as a squat, insulation joint flat, can cause large wheel-rail impact force. Both the magnitude and frequency content of force need to be correctly modelled because they are closely related formation, deterioration detection irregularities. In this paper, we compare two types commonly used wheel-track interaction models for problems, i.e., beam continuum finite element model. We first reveal differences between forces predicted by due typical squat using time-frequency analysis. Subsequently, identify causes evaluating effects different model assumptions, well parameters. Results show that consists forced vibration peak M1 followed free oscillations with three dominant frequencies: f1 (340 Hz), f2 (890 Hz) f3 (1120 Hz). Compared model, Hertzian contact spring overestimates The discrepancy reduced Winkler bedding For track is comparable up about 800 Hz, beyond which damping starts deviate. As result, above 500 dominate at while Finally, more accurate than comparing field observations. stress wave propagation on also discussed.