Research on Embedded Track System Vibration Transmission

Abstract

Objective Embedded tracks have relatively high damping, providing good vibration and noise reduction performance. Therefore, it is necessary to study the vibration reduction mechanism of embedded track system. Method Taking Guangzhou Metro Line 14 as example, static and dynamic vibration tests are conducted on both embedded and conventional fastener-based track systems. Based on the track structure frequency response functions and longitudinal attenuation rates obtained from field tests, the vibration reduction characteristics of embedded track system are analyzed. Result & Conclusion Embedded track system exhibits a distinct operational frequency band in vertical vibration reduction. In most frequency bands, the vibration acceleration amplitude of embedded tracks is smaller than that of conventional fastener-based tracks. When the vibration frequency is between 550 and 1 200 Hz, the polymer damping materials and the elastic pad shock-absorbing systems of embedded tracks exhibit good vibration absorption capabilities in this frequency band. Embedded tracks, like frequency-adjustable rail dampers, have a fixed adjustment frequency band, typically around 400 Hz. Compared to the track structure form by discrete support, the track structure form by continuous support shows better rail vibration attenuation rates in frequency bands above 750 Hz.

Keywords

• metro
• embedded track system
• vibration transmission