标题:
地铁与地面车辆引发振动的时频特征比较研究Comparative Study on Time-Frequency Characteristic of the Vibration Induced by Underground Subway and Road Vehicle
作者:
李广振, 宗刚, 张斌, 任晓崧
关键字:
地铁, 地面交通, 时频特征, 场地振动Subway, Road Vehicle, Time-Frequency Characteristic, Field Vibration
期刊名称:
《Hans Journal of Civil Engineering》, Vol.4 No.1, 2015-01-13
摘要:
在同一场地同时测得地铁和地面卡车两类振源引发场地振动的加速度响应，从时频角度统计信号有效频段、有效持时，其次分别以有效值、时频能量为参考量就振动沿距离衰减规律对两种振动进行比较分析。从分析结果来看，地铁与地面车辆引发振动在有效频段和有效持时方面差别显著；在衰减规律方面，地面交通引发振动在传播过程中放大现象不明显，而地铁引发振动在传播过程中放大现象则相对明显，且以时频能量为评价指标时，最大放大倍数为6.5倍，从这一方面也说明时频能量改善了有效值计算中对信号能量平均化处理的不足。
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.