Rail Roughness Monitoring in a Test Section Using Tuned Rail Damper to Control Rail Corrugation Growth

摘要

Based on the comprehensive understanding of the rolling noise excitation mechanism, rail roughness associated with rolling noise excitation. As squeal noise due to rail corrugation was found in the sections where Egg fastening system was installed as one of vibration isolation track structures in Beijing metro. In order to control the development of rail corrugation, tuned rail damper (TRD) was selected as a possible solution to optimize the train/track dynamic resonance frequencies by shifting the dynamic property of track structure. Frequency response function (FRF) and decay rate (DR) of vibration along the rail, as two important parameters to analysis the dynamic behavior of the track system, were measured by exciting the rail using an instrumented impact hammer. After that, rail roughness monitoring campaign was conducted during a period of more than 400 days. Measurement results shows TRD was demonstrated with remarkable performance on suppressing the growth of rail corrugation.