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<p>The wheel-rail dynamic interaction is particularly pronounced in curved track sections, and train operation with variable speeds can further intensify the wheel-rail creep effect, potentially leading to rail contact fatigue and related rail issues. Thus, a vehicle-track coupled dynamics model for curved sections was established considering the braking force. The simulation model was verified via field measurement data. Then, the influence of braking load on train running stability and rail performance characteristics was further analyzed. The main research results show that: Wheel-rail vertical forces follow a normal distribution pattern, while lateral forces conform to a Weibull distribution; Excessive braking loads can approximately double the wheelset lateral displacement and yaw angle, significantly deteriorating vehicle running stability and curve negotiation performance; Under braking conditions, the critical fatigue damage torques for the inner and outer rails are 2 kN·m and 6 kN·m, respectively, with inner rails being more prone to fatigue damage.</p>

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Characterization of the dynamic response of high-speed trains running at variable speeds in curved section

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • Chenxu Lu,
  • Rongsheng Deng,
  • Chunli Liu,
  • Dilai Chen,
  • Rang Zhang

摘要

The wheel-rail dynamic interaction is particularly pronounced in curved track sections, and train operation with variable speeds can further intensify the wheel-rail creep effect, potentially leading to rail contact fatigue and related rail issues. Thus, a vehicle-track coupled dynamics model for curved sections was established considering the braking force. The simulation model was verified via field measurement data. Then, the influence of braking load on train running stability and rail performance characteristics was further analyzed. The main research results show that: Wheel-rail vertical forces follow a normal distribution pattern, while lateral forces conform to a Weibull distribution; Excessive braking loads can approximately double the wheelset lateral displacement and yaw angle, significantly deteriorating vehicle running stability and curve negotiation performance; Under braking conditions, the critical fatigue damage torques for the inner and outer rails are 2 kN·m and 6 kN·m, respectively, with inner rails being more prone to fatigue damage.