PREDICTION OF EFFECT ON SENSITIVE INSTRUMENTS DUE TO VIBRATIONS INDUCED BY RUNNING METRO TRAINS

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (8) : 18-23.

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PREDICTION OF EFFECT ON SENSITIVE INSTRUMENTS DUE TO VIBRATIONS INDUCED BY RUNNING METRO TRAINS

LIU Weifeng, LIU Weining, Nie Zhili, WU Zongzhen, LI Kefei

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Abstract

The effect on the sensitive instruments in a building near metro line 8 in Beijing due to vibrations induced by metro traffic was predicted by means of a dynamic finite element model and in-situ measurement of road traffic induced vibrations, and responses inside and outside the building for the case of general non-ballast track and floating slab track in the tunnels were compared. In this paper, the mesh generation, the boundary condition and the damping in the finite element model were presented, the calculated dynamic wheel-rail force based on the in-situ vibration measurement on the rails are applied on the model. The results show that the vibrations induced by passage of metro trains in the tunnels can be effectively predicted using the dynamic finite element model. The floating slab track is an effective vibration mitigation measure, which can efficiently reduce the vibrations in its work frequency range. However, the floating slab track cannot reduce the vibrations at low frequencies, and increases the response at its resonance frequency. The combined vibrations due to road traffic and metro traffic will affect a few sensitive instruments after the metro line 8 is operated, which can be reduced by the passive isolation measure under the base of equipment.

Key words

metro traffic induced vibration / sensitive instrument / dynamic finite element model / vibration measurement / floating slab track

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LIU Weifeng;LIU Weining;Nie Zhili;WU Zongzhen;LI Kefei. PREDICTION OF EFFECT ON SENSITIVE INSTRUMENTS DUE TO VIBRATIONS INDUCED BY RUNNING METRO TRAINS[J]. Journal of Vibration and Shock, 2013, 32(8): 18-23