Study on the Wide-Frequency Tuned Mass Damper Inhibiting Rail Corrugation and Noise in Floating Slab Track

In order to solve the rail corrugation in the curved section of the steel spring floating slab track in Qingdao metro, a new type wide-frequency tuned mass damper (WTMD) was developed, which integrated the labyrinth restraint damping plate and TMD's technology. The track tests of the rail corrugation, rail vibration, interior noise, trackside noise were conducted before and after the WTMDs installation. After the study, the following three conclusions can be drawn: (1) Three times corrugation track tests show that the corrugation develops slowly at 1 month and 4.5 months after the installation of WTMD, and the corrugation is invisible. (2) After installing WTMD, the vertical and lateral vibration of the rail are 10% of the original, and the total rail vibration level will be reduced by 8.1 dB and 10.7 dB respectively. (3) The trackside noise, the passenger interior noise and the driver interior equivalent A-weighted noise overall levels decrease by 9.0, 7.7, and 5.8 dBA, after the WTMDs installation. It can be seen that, the installation of WTMDs can effectively reduce the rail vibration, inhibit the rail corrugation, and also play a good role in reducing the trackside noise and the interior noise.