Influence of rail fastener clamping force on vertical dynamic responses of wheel/rail system

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (24) : 17-24.

YUAN Xuancheng，ZHU Shengyang，YUAN Zhandong，ZHAI Wanming

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Abstract

Aiming at deepening the understanding of how rail fastener clamping force influences wheel/rail system vertical dynamic responses, an elaborated vertical dynamics model has been set up.The model was established based on the classic vehicle-track vertically coupled dynamics model, and was able to consider fastener clamping force and rail pad precompression.To reflect the actual force states of the spring clip and rail pad, the force elements with unidirectional action characteristics were implemented into the model.By numerical simulations, the proposed model and traditional model have been compared, and the analyses on how clamping force reduction and the amount of clamping force failure fasteners influence the vertical dynamic response of wheel/rail system have been carried out.Analysis results indicate that the reduction of clamping force mainly result in the reduction of rail pad reaction force while clamping force failure mainly leads to a sharp increase of vertical rail acceleration at the position where the clamping force fails.For the case of continuous multiple clamping forces failure, the vertical rail acceleration, upward rail displacement and vertical wheelset acceleration all increase as the amount of failure fasteners increases, while vertical wheel/rail force, vertical rail displacement under wheel load, and rail pad reaction force are hardly influenced by the amount of failed fasteners.

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vehicle-track coupled dynamics / rail fastener / spring clip / clamping force / failure

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YUAN Xuancheng，ZHU Shengyang，YUAN Zhandong，ZHAI Wanming. Influence of rail fastener clamping force on vertical dynamic responses of wheel/rail system[J]. Journal of Vibration and Shock, 2020, 39(24): 17-24

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