城市轨道交通新型网孔式弹性道床垫力学性能研究
王志璇和振兴包能能白彦博
Research on the Mechanical Properties of a New Mesh\|type Slab Track Mat for Urban Rail Transit
WANG ZhixuanHE ZhenxingBAO NengnengBAI Yanbo
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作者信息:兰州交通大学机电工程学院，730070，兰州
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Affiliation:School of Mechanical Engineering， Lanzhou Jiaotong University， 730070， Lanzhou， China
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Key words:
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DOI:10.16037/j.1007-869x.2023.11.009
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中图分类号/CLCN:U213.2+4
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栏目/Col:研究报告
摘要:
目的：网孔式弹性道床垫作为一种新型的道床垫，需要对其力学性能进行研究，以验证其应用于道床减振的可行性。方法：以既有USM型弹性道床垫及新型网孔式弹性道床垫作为研究对象，分析了这两种道床垫的结构特征，分别建立了两种道床垫的有限元模型。基于有限元模型模拟了两种弹性道床垫的动静刚度试验，在材料参数及其他尺寸参数不变的前提下，依次改变内接圆直径R2及道床垫厚度h2的取值，分析新型网孔式弹性道床垫应力及静刚度的变化规律。对两种弹性道床垫的综合性能（体积、最大应力、动静刚度）进行对比。结果及结论：新型网孔式弹性道床垫应用于道床减振具有可行性。改变R2及h2，可以灵活调整新型网孔式弹性道床垫的刚度。在相同受力面积、相同刚度及相同载荷的条件下，新型网孔式弹性道床垫的体积较既有USM型弹性道床垫降低了40.7％，所用材料可大幅节省。新型网孔式弹性道床垫的最大应力值较既有USM型弹性道床垫降低了43.0%，有利于提高道床垫的使用寿命。新型网孔式弹性道床垫的动静刚度比较既有USM型弹性道床垫更大，表明其具有更好的振动衰减能力。
Abstracts:
Objective: As a new type of elastic track mat, the mesh\|type elastic track mat needs to be studied for its mechanical properties to verify its feasibility in applying to track bed vibration reduction. Method: Two types of elastic track mats, the existing USM\|type elastic track mat and the new mesh\|type elastic track mat, are taken as research objects. The structural characteristics of the two types of elastic track mats are analyzed, and finite element models are established for each of them. Based on the models, dynamic and static stiffness tests of the two types of elastic track mats are simulated. Without varying the material parameters and other dimensional parameters, the values of the inner diameter R2 and the thickness h2 are changed sequentially, and the variation laws of stress and static stiffness of the new mesh\|type elastic track mat are analyzed. The comprehensive performance (volume, maximum stress, dynamic and static stiffness) of the two types of elastic track mats is compared. Result &Conclusion: The application of the new mesh\|type elastic track mat is feasible. Changing R2 and h2 can flexibly adjust the stiffness characteristics of the new mat. Under the same force area, stiffness, and load conditions, the volume of the new mesh\|type elastic track mat is reduced by 40.7% compared to the existing USM\|type elastic track mat, greatly saving materials. The maximum stress value of the new mesh\|type slab track mat is reduced by 43.0% compared to the existing USM\|type elastic ballast mat, which is beneficial to improve the service life of the ballast mat. The dynamic and static stiffness of the new mesh\|type elastic track mat is greater than that of the existing USM\|type elastic track mat, indicating that it has better vibration attenuation ability.
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