01630596

Component

An efficient model for predicting environmental vibration induced by the subway train load was established by the symplectic method. The frequency spectrum of the pseudo reaction force of fastener was calculated efficiently by American fifth-grade vertical track irregularity spectrum and the Chinese Shi-Tai Line track irregularity spectrum with consideration of the frequency-dependent stiffness of railpads, and then the power spectral density (PSD) of the environmental vibration can be obtained by the ground acceleration which was caused by the pseudo fastener reaction force. One-third octave unweighted vertical ground acceleration levels were calculated and compared to measured data at three positions 5m, 10m and 15m from the subway’s centerline. The calculated results agree with the measured date well in the entire frequency domain and just have 2.2 dB, 2.6 dB and 3.2 dB difference at the center frequencies of 63 Hz. The comparison further shows that the irregularity degree of the measured track is close to that under computational conditions, and the efficient model for the prediction of the environmental vibration has good prediction accuracy and efficiency.

This paper was sponsored by TRB committee ADC40 Standing Committee on Transportation-Related Noise and Vibration.

01618707

17-03144

English

17p

2017

Transportation Research Board 96th Annual Meeting

Digital/other

Figures; References; Tables

Dynamic loads; Mathematical models; Railroad cars; Railroad tracks; Railroad tunnels; Subways; Tie pads; Vibration

China

Railroads; Vehicles and Equipment

Transportation Research Board Annual Meeting 2017 Paper #17-03144

TRIS, TRB, ATRI

Dec 8 2016 11:10AM