Field tests on track vibrations in a subway tunnel, indoor vibrations, and secondary structure noise in nearby buildings were conducted. Vibrations and noise levels before and after speed reduction were evaluated and com-pared. The results show that tunnel vibrations, indoor vibrations, and secondary structure noise varied significantly be-tween trains, displaying notable dispersion. After speed reduction, overall vibrations decreased, but dispersion increased, significantly influenced by train conditions. Vibrations in the 40-80Hz frequency range are the main sources of indoor vibrations and secondary structure noise. Post-speed reduction, indoor vibrations and secondary structure noise levels decreased overall, but the impact duration extended, potentially increasing the total exposure to vibration and noise. Speed reduction is less effective for trains with poor wheel conditions. Wheel re-profiling is recommended to improve wheel-rail interaction and reduce vibrations and secondary structure noise. Time-segmented speed limits and wheel-rail improvements can inform enhancements in subway vibration and noise control.
Key words
rail transit /
speed limit operation /
building vibration /
secondary structural noise /
experimental study
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