Comparative Study on Time-Frequency Characteristic of the Vibration Induced by Underground Subway and Road Vehicle

A field test is carried out at a site where the vibration signal of both metro and road vehicles can be detected. Analyzing the vibration response in the respect of time-frequency of effective fre- quency band and effective duration, studying the attenuation law in the reference of RMS and time-frequency energy, this article highlights the differences between the two references in vibra- tion signal analysis. Out of the results, the time-frequency characteristic of the vibration induced by metro and road vehicle differs sharply; in the respect of attenuation law, the amplification of vibration induced by road vehicle during propagating is not so obvious but that of vibration in- duced by metro is clear, which reaches 6.5 in the reference of time-frequency energy; further more, this also demonstrates time-frequency energy method improves the deficiencies of RMS (root- mean-value) which is an average of the total energy on the whole history.