Vibration Behaviour of Railway Track under High Speed Moving Load

doi:10.3901/JME.2022.14.296

Abstract

Abstract: Considering the effects of discrete sleeper support, shear deformation and rotary inertia of the rail on the track vibration response under high speed moving load, a track vibration model including double-layer viscoelastic discrete supports and an infinite Timoshenko rail beam is established. The response of track with periodic supports is solved by the Fourier transform method. Compared with the experimental results in the literature, the correctness of the calculation results obtained by the presented method under fixed harmonic loads is verified. It is shown that the track stiffness changes periodically due to the discrete sleeper support, with the smallest in the middle of sleeper span and the largest above the sleeper, which forms a parametric excitation of high-speed wheel-rail system. Meanwhile, the track system exhibits resonance characteristics with respect to speed under moving load, in which the driving-point receptance increases firstly and then decreases with the increase of speed. In addition, the maximum track vibration response appears at the position of the load point at low speed, however, it lags behind the load point as the speed increases. The moving of the load changes the dominant frequency of the track system at each order. The dominant frequency of low-order vibration decreases with respect to the increase of speed firstly, and then increases with the increase of speed, as a result, the low-order natural frequency is zero in certain speed ranges. The dominant frequency of higher-order vibration also decreases nonlinearly with the increase of speed. Both the pinned-pinned resonance and the anti-resonance are bifurcated to up and down branches due to the Doppler effect induced by the moving load and the discrete support of the sleepers, and the bifurcation frequency offset is half of the sleeper passing frequency. The Fourier transform method is used to realize the analysis of track vibration response under high-speed moving load, which provided a reference for the design of high-speed track system.

Key words: railway track, vibration, high speed moving load, natural frequency

CLC Number:

U211
U270

GUAN Qinghua, WANG Wenbo, WEN Zefeng, JIN Xuesong. Vibration Behaviour of Railway Track under High Speed Moving Load[J]. Journal of Mechanical Engineering, 2022, 58(14): 296-307.

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