Volume 24 Issue 6
Dec.  2024
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2024  >  24(6): 159-171
LI Xia, TANG Wei, DAI Jia-yu, SHENG Xiao-zhen, WANG An-bin. Influence of frequency-dependent characteristics of double-layer nonlinear fastener system on wheel-rail dynamics characteristics[J]. Journal of Traffic and Transportation Engineering, 2024, 24(6): 159-171. doi: 10.19818/j.cnki.1671-1637.2024.06.011
Citation: LI Xia, TANG Wei, DAI Jia-yu, SHENG Xiao-zhen, WANG An-bin. Influence of frequency-dependent characteristics of double-layer nonlinear fastener system on wheel-rail dynamics characteristics[J]. Journal of Traffic and Transportation Engineering, 2024, 24(6): 159-171. doi: 10.19818/j.cnki.1671-1637.2024.06.011
shu

Influence of frequency-dependent characteristics of double-layer nonlinear fastener system on wheel-rail dynamics characteristics

doi: 10.19818/j.cnki.1671-1637.2024.06.011
  • 1.

    School of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China

  • 2.

    State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

Funds:

National Natural Science Foundation of China 52202477

Open Project of State Key Laboratory of Rail Transit Vehicle System RVL2402

More Information
  • Author Bio:

    LI Xia(1986-), female, associate professor, PhD, xiali20034164@126.com

  • Received Date: 2024-06-28
  • Publish Date: 2024-12-25
    Abstract
  • To study the influence of frequency-dependent characteristics of double-layer nonlinear fastener system on wheel-rail dynamics characteristics, the dynamic stiffness of the fastener system within the frequency range of 100-1 000 Hz was obtained by hammering method. The finite element models of track structure and wheel-rail transient rolling contact were established. The frequency-dependent characteristics of the fastener system were considered in the models. Based on the track structure model, the influence of the frequency-dependent characteristics of the fastener system on the rail vibration characteristics was analyzed. The influence of the fastener system on the wheel-rail dynamics characteristics was analyzed by using the transient rolling contact model. Research results show that the dynamic stiffnesses of the fastener system in the vertical, lateral, and longitudinal directions generally increase with frequency. The frequency-dependent characteristics of the fastener system lead to more significant rail vibration at the frequency of above 340 Hz, and the frequency range corresponding to the peak rail vibration shifts towards higher frequencies. The changes in rail vibration response within the frequency range of 340-700 Hz are caused by the combined effects of frequency-dependent stiffness and damping, while the changes within the frequency range of 800-900 Hz are primarily influenced by the frequency-dependent stiffness of the fastener system. These changes in rail vibration response have a significant impact on the passing frequency of short-wavelength rail corrugation at above 340 Hz in small-radius curve sections. Therefore, considering the frequency-dependent characteristics of the fastener system is beneficial for improving the prediction accuracy of short-wavelength rail corrugation in this frequency range. The frequency-dependent stiffness of the fastener system has a relatively small impact on axle box vibration acceleration and wheel-rail forces, and the maximum value reduces by about 2%. However, the frequency-dependent damping of the fastener system has a significant impact on both. The frequency-dependent damping increases axle box vibration acceleration and wheel-rail forces within the frequency range of 100-470 Hz and reduces them within the frequency range of 470-1 000 Hz. The frequency-dependent characteristics of the fastener system have little effect on the maximum wheel-rail contact stress. When frequency-dependent stiffness is considered, the corresponding wheel-rail contact stress is slightly higher, and when frequency-dependent damping is considered, the corresponding wheel-rail contact stress is slightly lower.

     

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