Effect of unsupported sleepers on wheel/rail dynamic interaction in heavy-haul railway

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (18) : 1-7.

Dawei Zhang1, Kaiyun Wang1, Wanming Zhai1, Pengfei Liu2

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Abstract

In order to investigate the effect of unsupported sleepers on wheel/rail dynamic interaction in heavy-haul railway, a vehicle－track coupled dynamic model for the heavy-haul freight with double suspension systems was built, taking some nonlinear factors into account. The dynamic response of wheel/rail system was calculated by numerical computation method and influence of train running speed and hang sleepers number on wheel/rail dynamic performance were compared under the conditions of complete unsupported sleepers and incomplete unsupported sleepers. Results show that the unsupported sleepers destroy the continuity of the track structure support, resulting in wheel/rail interaction rising; especially under the condition of complete hang sleepers it significantly increases with the increase of train running speed and the hang sleeper numbers. The hang sleepers will also affect the dynamic characteristics of the normal track structure before and after those. Combined action of the unsupported and track irregularity will exacerbate the wheel/rail dynamic interaction. The asymmetric sleeper support gap on both ends would also exacerbate the wheel/rail dynamic interaction under the condition of incomplete hang sleepers.

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heavy-haul railway / unsupported sleepers / vehicle－track coupled dynamic / wheel/rail dynamic interaction

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Dawei Zhang1, Kaiyun Wang1, Wanming Zhai1, Pengfei Liu2. Effect of unsupported sleepers on wheel/rail dynamic interaction in heavy-haul railway[J]. Journal of Vibration and Shock, 2017, 36(18): 1-7

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