中低速磁浮快线车-轨耦合振动源强特性试验
李秋义罗伟魏高恒
Vibration Source Intensity Characteristic Experiment of Low\|medium Speed Maglev Vehicle\|Rail Coupling
LI QiuyiLUO WeiWEI Gaoheng
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作者信息:1.1.中铁第四勘察设计院集团有限公司，430063，武汉;
2.2.铁路轨道安全服役湖北省重点实验室，430063，武汉
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Affiliation:China Railway Siyuan Survey and Design Group, 430063, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.01.002
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中图分类号/CLCN:U270.1+1U266.4
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栏目/Col:学术专论
摘要:
中低速磁浮快线作为一种新兴的城市轨道交通型式，其车-轨耦合作用实测资料很少。通过对长沙中低速磁浮快线提速试验中的轨道-桥梁系统车致振动实测数据进行分析，结果表明：轨道-桥梁系统的振动随传播距离增加而逐渐衰减，以从钢枕端部到承轨台的衰减最为显著；轨排接头对振动从钢枕到承轨台的传播具有“路径阻断”效应，主要出现在20 Hz以下的频率范围；钢枕测点2~200 Hz的振动分量Ⅲ型接头断面较轨排中部断面大，承轨台测点振动的优势频段为63~125 Hz；在以设计速度100 km/h运行工况下Ⅲ型接头断面、轨排中部断面的环境振动源强Lvl,z,max分别为81.4 dB和81.1 dB，提速至150 km/h时均为84.2 dB；两个断面的环境振动源强均与行车速度表现出比较显著的线性关系，可按本研究给出的Lvl,z,max-v表达式进行源强计算。
Abstracts:
As a new type of urban rail transit, the low\|medium speed maglev has little documentation on field measured results of vehicle\|rail coupling interaction. By analyzing the field measured vibration data of track\|bridge system of Changsha Maglev Express in speed\|raising test, the results show that the vibration of track\|bridge system gradually attenuates with the increase of propagation distance, and the attenuation from sleeper end to rail support is the most significant. There is a ′path blocking′ effect of rail row joint on the vibration propagation from sleeper to rail support, which is mainly reflected in the frequency range below 20 Hz. Type Ⅲ joint section with sleeper measuring point of 2~200 Hz vibration component is larger than rail row middle section. The dominant frequency band of measuring point vibration at rail support is 63~125 Hz. Under the operating condition of design speed of 100 km/h, the environmental vibration source intensity Lvl，z，max of type Ⅲ joint section and rail row middle section become 81.4 dB and 81.1 dB respectively, and both are 84.2 dB when the speed is raised to 150 km/h. The environmental vibration source intensity shows a significant linear relationship with the running speed, and the source intensity can be calculated according to the Lvl，z，max-v expression given in this study.
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