Comparative Study on Time-Frequency Characteristic of the Vibration Induced by Underground Subway and Road Vehicle
Abstract: 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 frequency 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 induced 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.
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