Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats.
Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats.
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DOI：
10.3390/ma14020452
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发表时间：
2021-01-18
期刊：
影响因子：
--
通讯作者：
Wang P
中科院分区：
文献类型：
--
作者：
Zhao Z;Wei K;Ding W;Cheng F;Wang P
本研究的目的是调查并提高现有板式轨道垫（STM）规范在减振效果评估中的准确性。测试了三种类型 STM 的静态非线性和动态机械特性，然后使用修正的分数阶导数 Poynting-Thomson (FDPT) 模型来表征预紧力和频率依赖性。建立了改进的车辆-浮置板轨道（FST）耦合动力学模型来分析实际插入损耗。由频率相关的切向刚度评估的插入损耗误差随着STM非线性的增加而增大，并且由第三预紧力切向刚度获得的误差通常大于第二预紧力得到的误差。与割线刚度相比，第二预紧频率相关的切线刚度更适合评估具有高静态低动态（HSLD）刚度的 STM。为了体现频率依赖性效应并便于工程应用，建议采用FST固有频率对应的第二预载切向刚度进行评价。此外，随着轴重的增加，刚度单调增加的STM的插入损耗降低，而刚度单调减少的STM则相反。具有HSLD刚度的STM的隔振效率既稳定又优于具有单调刚度的STM。
The purpose of this research was to investigate and improve the accuracy of the existing slab-track mat (STM) specifications in the evaluation of the vibration reduction effect. The static nonlinearity and dynamic mechanical characteristics of three types of STMs were tested, and then a modified fractional derivative Poynting–Thomson (FDPT) model was used to characterize the preload and frequency dependence. A modified vehicle–floating slab track (FST) coupled dynamic model was established to analyze the actual insertion loss. The insertion loss error evaluated by the frequency-dependent tangent stiffness increased with the increase in STM nonlinearity, and the error obtained by the third preload tangent stiffness was usually greater than that of the second preload. Compared with the secant stiffness, the second preload frequency-dependent tangent stiffness was more suitable for evaluating STMs with high-static–low-dynamics (HSLD) stiffness. In order to reflect the frequency dependence effect and facilitate engineering applications, it is recommended that second preload tangent stiffness corresponding to the natural frequency of the FST be used for evaluation. Furthermore, the insertion loss of the STMs with monotonically increased stiffness decreased as the axle load increased, and the opposite was true for the STMs with monotonically decreased stiffness. The vibration isolation efficiency of the STMs with HSLD stiffness was both stable and better than that of the STMs with monotonic stiffness.
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影响因子：
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