Research on the mechanism of rail corrugation of steel spring floating slab track on metro

Abstract

Steel spring floating slab track (SSFST) is an effective vibration and noise reduction measure, which is gradually used in urban rail transit in recent years. In order to better solve the problems of vibration noise and abnormal rail corrugation on metro lines, the dynamic model of vehicle-track system including metro vehicle and track structure is established by using the simulation software. The relationship between the passing frequency of vehicle and the vibration frequency of track structure, as well as the resonance characteristics of the elastic track structure are analyzed so as to obtain cause of rail corrugation on SSFST. The results show the following: (1) It is a more obvious resonance phenomenon between the inner rail and the floating slab at the vibration frequency of 116 and 161 Hz (R300 m), 262 Hz (R1000 m) and 320-387 Hz (R1500 m), and the simulation of rail corrugation wavelength is closer to field measured data. (2) Comparing the vibration frequency distribution of ordinary track and SSFST under the same curve radius, the rail corrugation is related to the natural vibration characteristics of track structure. (3) The vibration characteristics of the track structure and the periodic wear characteristics of the rail are the key factors for the formation of rail corrugation.