[1]YU Haiying,ZHU Da,ZHOU Baofeng,et al.Environmental Vibration Noise Measurement and Reduction of the Harbin Metro[J].Journal of Seismological Research,2020,43(01):166-175.
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Environmental Vibration Noise Measurement and Reduction of the Harbin Metro
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
43
Number of periods:
2020 01
Page number:
166-175
Column:
Public date:
2020-01-30
- Title:
- Environmental Vibration Noise Measurement and Reduction of the Harbin Metro
- CLC:
- P315.9
- DOI:
- -
- Abstract:
- Considering the impact of environmental vibration noise induced by current urban subways on the identification of seismic signals of earthquake alert system of future urban subway,we select the upline heads and tails of 4 subway stations of the Harbin Metro Line 1 whose types of site soil include both type Ⅱ and type Ⅲ as the observing points to carry out the measurement and reduction analysis of environmental vibration noise caused by the urban underground.Firstly,we use statistical methods to analyze the data collected from the testing stations,and the analytical result shows that the amplitudes of vertical vibration of the subway train are greater than that of the horizontal vibration and the amplitudes of tangential vibration are greater than that of the radial vibration among the tri-axial train vibration signals of subway train.Secondly,based on the moving average method,we propose an empirical method for determining the bandwidth of the Parzen Window,that is,lue.It shows that when the bandwidth is set as 0.4 Hz,the dominant frequency component of the Fourier spectrum of the ground pulsation signal is salient after the ground pulsation signal are smoothed and filtered.Besides,there are clear corresponding relationships between the predominant frequency of the filtered ground pulsation signal and the type of site soil.In other words,the correlation between the predominant frequency of horizontal ground pulsation signal and the type of site soil is better,while the predominant frequency of vertical ground pulsation signal has a larger error.Finally,based on the empirical method mentioned above,we determine the filtering frequency band of P-wave earthquake early warning system pertaining to the Harbin Metro and then compare it with the filtering frequency band designed for both the Japan Meteorological Agency's instrumental intensity and the Shinkansen earthquake early warning system. And we find that when the filtering frequency band is set between 0.3 Hz and 10 Hz,the P-wave earthquake early warning system of the Harbin Metro can better filter out the frequency components belonging to the environmental vibration noise of the urban subway among the mixture of seismic signal and vibration noise and meet the requirements of the earthquake alert system for the signal-to-noise ratio of the seismic record.
- References:
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Last Update:
2020-01-30