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中文摘要：
以我国地铁扣件中常用的热塑性聚氨酯胶垫、氯丁胶垫以及三元乙丙胶垫为研究对象,利用配备温度箱的万能试验机,测取-40-70℃温度环境中3类胶垫的静刚度。运用车辆-轨道耦合系统随机振动分析模型,计算分析不同温度环境下扣件胶垫温变刚度对轮轨系统随机振动频响特征的影响规律,据此评价3类扣件胶垫的温度敏感性。研究结果表明：3类扣件胶垫静刚度随温度的变化呈非线性的变化趋势,对20℃以下的低温均比较敏感,其中氯丁胶垫最为敏感,聚氨酯与三元乙丙胶垫的低温敏感度相近;在20℃以上的高温区,聚氨酯胶垫静刚度略有上升,氯丁与三元乙丙胶垫静刚度随温度的升高而缓慢下降,3类扣件胶垫静刚度在高温区的变化幅度均较小,具有良好的高温稳定性;扣件胶垫温变刚度主要影响中心频率31.5Hz以上的车辆与中心频率63 Hz附近的钢轨竖向随机振动响应,20--40℃温降环境的影响远大于20~70℃的温升情况。
英文摘要：
With the commonly used rail pads of Thermoplastic Polyurethane Elastomer（TPEE）,Chloroprene Rubber（CR）and Ethylene Propylene Diene Monomer（EPDM）applied in the subway in China as the research object,the static stiffness of these three kinds of rail pads was measured in the temperature range between-40℃ and 70℃ with application of the universal testing machine equipped with temperature control box.Then,the influence of temperature-dependent stiffness of rail pads on the frequency-domain random vibration of subway vehicle-track coupled system under different temperatures was analyzed through vehicle-track coupled dynamic model used for calculation of vehicle-track coupled random vibration.According to the calculated results,the temperature sensitivity of the three kinds of rail pads was evaluated.The research conclusions showed that the static stiffness of these rail pads appeared a non-linear variation with the change of temperatures and was particularly sensitive to the lower temperature range under 20 ℃,in which CR was most sensitive and the temperature sensitivity of TPEE was similar to that of EPDM.In the higher temperature range over 20 ℃,the static stiffness of TPEE slightly increased with the increase of temperatures,while the static stiffness of CR and EPDM slowly decreased with the increase of temperatures.Given the minor variation of their static stiffness in the higher temperaturerange,these three kinds of rail pads were provided with excellent high-temperature stability.The temperature-dependent stiffness of rail pads had a major impact on the vertical random vibration of vehicle system above the center frequency of 31.5Hz and the vertical random vibration of rail near the center frequency of 63 Hz.Further,the influence of the lower temperature range between-40 ℃and 20 ℃ was far greater than that of the higher temperature range between 20 ℃ and 70 ℃.
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