Vibration analysis of layered saturated ground-track-vehicle coupling system induced by track irregularities

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (15) : 88-97.

Ba zhenning1,2, Jin wei1, Liang Jianwen1,2

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Abstract

The dynamic responses of layered saturated ground-track-train coupling system are studied by the semi-analytical method. The layered saturated ground is composed by arbitrary horizontal saturated layers and the underlying saturated half-space. The track is composed by the rail, the sleepers and the blast. The rail is regarded as an infinitely long Euler beam; the sleepers are represented by a continuous mass and the ballast is accounted for by introducing the Cosserat model. The vehicle is described as a multi-rigid-body system connected by the spring and damping elements. The dynamic loads are assumed to be generated from the rail surface irregularities. The dynamic responses are first obtained in the frequency-wave number domain and then are transformed into the time-space domain by inverse Fourier transformation. Finally, the dynamic responses in the time-space domain are obtained by using inverse Fourier transform. The exactness of the method is verified and numerical calculation and analysis are performed. The study shows that, for low vibration frequencies induced by track irregularities, the ground surface displacement amplitudes increase gradually with the increase of the velocity, while for high vibration frequencies, the maximum displacement amplitudes seems insensitive to the velocity, but the amplitudes vibrate more seriously and the durations of the vibration become longer.

Key words

layered saturated ground / ground-track- vehicle coupling system / green’s function / rail irregularity

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Ba zhenning1,2, Jin wei1, Liang Jianwen1,2. Vibration analysis of layered saturated ground-track-vehicle coupling system induced by track irregularities[J]. Journal of Vibration and Shock, 2015, 34(15): 88-97

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