Decay rate of rail with egg fastening system using tuned rail damper

Abstract In order to study the decay rate of the rail in some section of Beijing metro using the egg fastening system, a cellular rail model based on the spectral element method is established. In combination with Bloch theorem, the decay rate of the rail with the egg fastening system is hereby studied. On this basis, the influence of tuned rail damper (TRD) on the decay rate of the rail is analyzed. At present, the decay rate of the rail with the egg fastening system is relatively low, in the frequency range from 200 Hz to 400 Hz. The influence of the egg fastening system on the decay rate of the rail is mainly reflected in the frequency range below 450 Hz. TRD can greatly increase the decay rate of the rail in the vicinity of its operating frequency. Moreover, TRD damping can increase the decay rate of the rail, which is beneficial in controlling rail vibration. Rail vibration can be better controlled by increasing the weight of TRD when the operating frequency is constant. The installation position of TRD also affects the decay rate of the rail. Appropriate adjustment of this position can more effectively suppress rail vibrations over a wider frequency range.