基于减振性能的市域铁路弹性支承块轨道刚度匹配研究
谢甜1赵坪锐1章元爱2
Research on City Railway Elastic Bearing Block Track Stiffness Matching Based on Vibration Reduction Performance
XIE TianZHAO PingruiZHANG Yuan’ai
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作者信息:1.西南交通大学土木工程学院， 610036， 成都
2.中铁西南科学研究院有限公司， 610036， 成都
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Affiliation:School of Civil Engineering, Southwest Jiaotong University, 610036, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.08.033
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中图分类号/CLCN:U213.2∶U239.5
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栏目/Col:研究报告
摘要:
目的：为了降低弹性支承块式无砟轨道市域铁路的振动对周边环境的影响，需要确定弹性支承块式无砟轨道的扣件刚度和块下刚度组合下的合理取值范围，使市域铁路下弹性支承块式无砟轨道达到最佳减振效果。方法：基于车辆轨道耦合动力学理论，利用车辆轨道耦合动力学理论，分析了不同扣件刚度和块下刚度组合情况下，市域列车通过时的振动相应时程曲线，并进一步得到了弹性支承块轨道的道床板频响曲线和分频振级曲线及整体道床的道床板频响曲线和分频振级曲线。通过对比分析，初步确定弹性支承块轨道结构中扣件刚度和块下刚度的合理取值范围，结果及结论：当块下刚度增大时，弹性支承块轨道道床板的Z振级随之增大；扣件的垂向刚度增大时，弹性支承块轨道道床板的Z振级随之增大，普通整体道床的Z振级也略有增大；在列车运行速度为160 km/h，扣件刚度取值为60~80 kN/mm左右，块下刚度取值为80~110 kN/mm左右时，弹性支承块轨道系统可达到较好的减振效果，最大减振值为7.79 dB。
Abstracts:
Objective: To reduce the vibration impact of city railway EBB (elastic bearing block) ballastless track on surrounding environment, it is necessary to determine the reasonable range of fastener stiffness and subblock stiffness combinations for the EBB ballastless track, which will enable optimal vibration reduction effects for city railway with EBB ballastless track. Method: Based on vehicletrack coupled dynamics theory, the vibration response timehistory curves of city railway trains passing under different combinations of fastener stiffness and subblock stiffness are analyzed. Furthermore, the frequency response curve and frequency division vibration level curve of EBB track bed plate and those of monolithic track bed plate are obtained. Through comparison and analysis, the reasonable range of fastener stiffness and subblock stiffness in EBB track structure is preliminarily determined. Result & Conclusion: When the subblock stiffness increases, the Z vibration level of EBB track bed plate increases accordingly; when the fastener vertical stiffness increases, the Z vibration level of EBB track bed plate increases accordingly, and the Z vibration level of common monolithic track bed plate also increases slightly. Under the conditions of train operating speed of 160 km/h, fastener stiffness value around 6080 kN/mm and subblock stiffness value around 80110 kN/mm, the EBB track system can achieve good vibration reduction effects, with a maximum vibration reduction value of 7.79 dB.
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