Influences of random wheel irregularity and vehicle parameters on the vibration of track in frequency domain

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (22) : 104-111.

LI Minghang1，MA Meng1，TAN Xinyu1，ZHANG Hougui2，LIU Weifeng1

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Abstract

Train-induced track vibrations are affected by various factors, such as the difference of vehicle parameters and wheel maintenance status. The vibration responses induced by different metro trains passing through a fixed measurement section exhibit significant uncertainty, and the dispersion characteristics of different frequency bands differ significantly in the frequency domain. In order to analyse the influence of random wheel irregularities and random vehicle parameters on the track vibration in the frequency domain, the power spectral density model of random wheel irregularities was constructed based on the measured wheel out-of-round samples of typical metro trains with different operation mileage. The dynamic track irregularities, rail roughness and vertical vibration acceleration of track in a metro running tunnel were also tested in-situ. Based on the train-track coupled analytical model in the frequency domain, the track dynamic responses under the combination of random vehicle parameters and random wheels irregularities were calculated by the random simulation method. The research results indicate that, the frequency-domain track vibration responses are in good agreement with the measured values, and the average absolute percentage error of between 8 Hz and 200 Hz is only 2.4%. Under the influence of random vehicle parameters and random wheels irregularities power spectral density coupling measured track irregularity, there is no significant dispersion of vibration response below 8 Hz. The vibration acceleration levels above 16 Hz are obviously discrete and show normal skew distribution characteristics. The differences of frequency divided vibration levels above 63 Hz are more than 20 dB.

Key words

power spectral density / wheel irregularity / vehicle parameters / train-track coupled model / wheel-rail coupled irregularity / stochastic simulation

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LI Minghang1，MA Meng1，TAN Xinyu1，ZHANG Hougui2，LIU Weifeng1. Influences of random wheel irregularity and vehicle parameters on the vibration of track in frequency domain[J]. Journal of Vibration and Shock, 2021, 40(22): 104-111

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