Prediction of metro train-induced low frequency vibration responses in far field

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (4) : 198-202.

SUN Xiaojing1,YUAN Yang2,MA Meng1,LIU Weining1

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Abstract

Since the micro vibration in low frequency range has significant influence on precision instrument,to predict the low frequency vibration impact induced by metro trains becomes a challenge problem.
Taking the case of Beijing Metro Line 16 passing below Peking University as an example,quantitative prediction of metro train-induced low frequency vibration responses in far field was researched in this paper by using a two-position calibration method. In the research,the simulated train loads were firstly obtained by frequency-hold transforming with the measured rail acceleration. Then,the FEM model of Beijing Metro Line 4 was established,and the input load and parameters were calibrated by compared with the measured data collected from tunnel wall and ground surface. Finally,the FEM model of Line 16 was established to predict low frequency vibration effects. The results show that (1) the simulated train loads and the FEM model can provide sufficient prediction accuracy in low frequency range. (2) in the case of Beijing metro line 16 passing below Peking Laboratory Building,the steel-spring-floating-slab is able to provide great vibration isolation performance,which can meet the required limit of instrument in the range of 10-20 Hz,but in the range of 0-10 Hz,the vibration is just under the VC-C limited standard; therefore,in the range of 0-10 Hz,extra treatments are needed on buildings and instruments.

Key words

low frequency vibration / far field vibration / two-position calibration method / dynamic finite element / train load

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SUN Xiaojing1,YUAN Yang2,MA Meng1,LIU Weining1. Prediction of metro train-induced low frequency vibration responses in far field[J]. Journal of Vibration and Shock, 2017, 36(4): 198-202

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