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Volume 57 Issue 4
Jul.  2022
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Journal of Southwest Jiaotong University  > 2022  >  57(4): 848-854, 925.
WANG Ping, GAO Tianci, WANG Xin, YANG Cuiping, WANG Yuan. Smoothness Estimation of Super-large Bridges in Railway Line Based on Fitting Railway Plane and Profile[J]. Journal of Southwest Jiaotong University, 2020, 55(2): 231-237, 272. doi: 10.3969/j.issn.0258-2724.20180295
Citation: WEI Kai, ZHAO Zeming, WANG Xian, DING Wenhao, CHENG Yilong, DING Deyun. Stiffness Test and Evaluation Method of Floating Slab Track Damping Pad[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 848-854, 925. doi: 10.3969/j.issn.0258-2724.20200190
shu

Stiffness Test and Evaluation Method of Floating Slab Track Damping Pad

doi: 10.3969/j.issn.0258-2724.20200190
  • 1.

    MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China

  • 2.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

  • 3.

    Beijing Jiuzhouyigui Shock & Vibration Isolation Technology Co., Ltd., Beijing 100070, China

  • Received Date: 14 Apr 2020
  • Rev Recd Date: 12 May 2020
  • Publish Date: 20 May 2020
    Abstract

  • The purpose of this study was to test and evaluate the stiffness of the damping pad of a floating slab track and to provide accurate calculation parameters for the dynamic simulation analysis of the floating track. In this study, the load application range of the damping pad test samples was calculated in a finite element simulation, and the static stiffness and dynamic stiffness (5.0、10.0、20.0、30.0 Hz) of the damping pad were tested and evaluated using a mechanical testing machine equipped with a temperature control box and combined with time-temperature superposition. On the basis of the actual mechanical characteristics of the anti-vibration damping pads, the effects of using traditional 4.0 Hz parameters and actual frequency-dependent parameters on the simulated natural frequency and admittance characteristics of the floating slab track were compared and analyzed. The results show that the static stiffness of damping pads should be tested in three different load ranges according to the deformation, static analysis and analysis of the bending deformation of the base plate. The dynamic stiffness of damping pads should be tested under three different preloading conditions according to the tuning frequency, safety and insertion loss analysis of the floating slab track. In the case of no vehicle load (under a vehicle load), the natural frequency of the floating slab obtained using the 4.0 Hz parameters of the polyurethane damping pad is 27.0 Hz (15.5 Hz) , whereas the true natural frequency after considering the frequency-dependent stiffness of the damping pad is 31.5 Hz (18.3 Hz) . The natural frequency of the floating slab track would be underestimated and the vibration isolation frequency band and vibration isolation effect would be overestimated if parameters obtained at 4.0 Hz are used to analyze the vibration transfer characteristics of the floating slab track. The admittance results obtained with the parameters at the first-order frequency of the floating slab track are basically consistent with those obtained using the actual frequency-dependent characteristics.

     

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    • References(12)
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