Analysis on dynamic characteristics of track with floating fasteners considering loading of flexible wheelsets

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (24) : 42-50.

YAO Xuedong，LI Wei，ZHOU Zhijun，WEN Zefeng

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Abstract

The floating fastener is a type of resilient fasteners with very low vertical stiffness. However, short-pitch rail corrugation occurs on tracks with the floating fasteners on China metro lines, resulting in large vehicle interior vibration noise. To investigate the dynamic characteristics of the track, a three-dimensional finite element model of the track is established using the finite element software ABAQUS. The modal analysis and harmonic response analysis are conducted to investigate the dynamic characteristics of the track loaded by flexible wheelsets. The results show that: The wave reflection effect caused by the simplified truncated boundary of a periodically discrete supported track on the dynamic characteristics of the track is significant when the length of track in the numerical model is not enough. The effect of the boundary wave reflections can be ignored when the length of track model in the frequencies of below 1500 Hz is more than 80 sleeper spacings. In the frequencies of 10–80 Hz, the vibration modes of the track structure are bending and torsional vibrations of rail and slab as a whole. However, at above 80 Hz, the rail vibrates relative to the slab which also shows a bending vibration. The vertical dynamic characteristics of track at below 500 Hz are significantly influenced by the wheel–rail contact stiffness and the wheelset mass. But they are not influenced by the contact stiffness and the wheelset mass when the frequency is large than the first-order vertical pinned-pinned resonance frequency of the rail. The rail will show local bending vibration characteristics if double wheelsets of the bogie are considered. Harmonic peaks appear of the vertical dynamic characteristics of track under the influence of the first-order bending, second-order bending and umbrella modes of the wheel.

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metro tracks / floating fasteners / finite element method / modal analysis / flexible wheelsets / wheel–rail interaction

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YAO Xuedong，LI Wei，ZHOU Zhijun，WEN Zefeng. Analysis on dynamic characteristics of track with floating fasteners considering loading of flexible wheelsets[J]. Journal of Vibration and Shock, 2023, 42(24): 42-50

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