减振垫层温频变动力性能对无砟轨道振动特性影响

doi:10.16183/j.cnki.jsjtu.2021.030

上海交通大学学报 ›› 2022, Vol. 56 ›› Issue (9): 1238-1246.doi: 10.16183/j.cnki.jsjtu.2021.030

减振垫层温频变动力性能对无砟轨道振动特性影响

牛振宇, 刘林芽(), 秦佳良, 左志远

华东交通大学铁路环境振动与噪声教育部工程研究中心,南昌 330013

收稿日期:2021-01-22 出版日期:2022-09-28 发布日期:2022-10-09
通讯作者: 刘林芽 E-mail:lly1949@163.com
作者简介:牛振宇(1996-),男,河南省鹤壁市人,硕士生,从事高速铁路减振降噪研究.
基金资助:
国家自然科学基金(51578238);国家自然科学基金(51968025);江西省自然科学基金重点项目(20192ACBL20009);江西省青年科学基金(20202BABL214048)

Effect of Dynamic Properties of Temperature and Frequency-Dependent Properties of Damping Layer on Vibration Characteristics of Ballastless Track

NIU Zhenyu, LIU Linya(), QIN Jialiang, ZUO Zhiyuan

Engineering Research Center of Railway Environment Virbration and Noise of the Ministry of Education, East China Jiaotong University, Nanchang 330013, China

Received:2021-01-22 Online:2022-09-28 Published:2022-10-09
Contact: LIU Linya E-mail:lly1949@163.com

摘要/Abstract

摘要：

以减振垫层为研究对象,首先通过动态力学性能试验,基于高阶分数阶导数FVMP模型并结合温频等效原理,表征减振垫层的温频变特性;然后将该模型应用于车辆-CRTSIII板式无砟轨道垂向耦合系统中;最后分析了减振垫层温频变特性对轨道结构振动响应的影响.结果表明:温度和加载频率对减振垫层的动态力学性能有显著影响,高阶分数阶导数FVMP模型能准确表征这种动态力学行为.在时域响应中,轨道板位移和加速度在FVMP模型下计算的峰值明显大于Kelvin-Voigt(K-V)模型下的峰值.FVMP模型在各参考温度点下轨道板位移的响应呈现出随着温度的降低而减小的趋势,而轨道板加速度则呈现随着温度的降低而增大的趋势.在中高频段内,轨道板的响应表现为FVMP模型下的频域响应大于K-V模型下的频域响应,FVMP模型各参考温度点在该频段内轨道板的响应表现为随着温度的降低而减小的趋势.因此,为提高对轨道结构预测的准确性,有必要考虑减振垫层的温频变特性.

关键词: 减振垫层, FVMP模型, 温频等效原理, 温频变特性, 车-轨耦合系统

Abstract:

Taking the damping layer as the research object, first, by using the dynamic mechanical test, based on the high-order fractional derivative FVMP model, and in combination with the temperature-frequency equivalent principle, the temperature and frequency dependent properties of the damping layer was characterized. Then, the model was applied to the vehicle-CRTSIII slab ballastless track coupled system. Finally, the effect of the temperature and frequency dependent properties of the damping layer on track structure vibration response was analyzed. The results show that the temperature and the loading frequency have a significant impact on the dynamic mechanical properties on the damping layer and the high-order fractional derivative FVMP model can accurately characterize this property. In the time domain response, the peak values of the slab track displacement and the acceleration on the FVMP model are significantly larger than those on the K-V model. At each reference temperature point, the displacement response of the slab track on the FVMP model decreases with the decrease of temperature, while the acceleration of the slab track shows an opposite trend. In the middle and high frequency band, the frequency domain response of the slab track on the FVMP model are greater than those on the K-V model. At each reference temperature point, the response of the slab track on the FVMP model decreases with the decrease of the temperature. Therefore, in order to improve the accuracy of the track structure prediction, it is necessary to consider the temperature and frequency dependent properties of the damping layer.

Key words: damping layer, FVMP model, temperature-frequency equivalent principle, temperature and frequency dependent properties, vehicle-track coupled system

中图分类号:

U238

牛振宇, 刘林芽, 秦佳良, 左志远. 减振垫层温频变动力性能对无砟轨道振动特性影响[J]. 上海交通大学学报, 2022, 56(9): 1238-1246.

NIU Zhenyu, LIU Linya, QIN Jialiang, ZUO Zhiyuan. Effect of Dynamic Properties of Temperature and Frequency-Dependent Properties of Damping Layer on Vibration Characteristics of Ballastless Track[J]. Journal of Shanghai Jiao Tong University, 2022, 56(9): 1238-1246.

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FVMP 模型参数	取值
FVMP 模型参数	40 ℃	20 ℃	-40 ℃
μ₁	7.002	12.198	16.714
η₁	8.462	2.959	2.249
μ₂	5.897	10.951	43.467
η₂	9.344	13.246	4.562
α	0.173	0.118	0.113
β	0.100	0.119	0.259
γ	0.112	0.238	0.443

动力学参数	取值
钢轨弹性模量/(N·m²)	2.06×10¹¹
钢轨截面惯性矩/m⁴	3.217×10^-5
钢轨每延米质量/(kg·m^-1)	60.64
钢轨截面面积/m²	7.745×10^-3
钢轨切变模量/(N·m²)	7.7×10¹⁰
钢轨截面系数	0.5331
扣件胶垫刚度/(N·m)	2.7×10⁷
扣件胶垫阻尼/(N·s·m)	1.13×10⁶
扣件间距/m	0.625
轨道板密度ρ_s/(kg·m³)	2.5×10³
轨道板弹性模量E_b/Pa	3.65×10¹⁰
轨道板长、宽、高/m	5.6, 2.50, 0.29
减振垫层分布刚度k_s/(N·m²)	1.41×10⁸
减振垫层分布阻尼c_s/(N·s·m²)	1.21×10⁶

减振垫层温频变动力性能对无砟轨道振动特性影响

Effect of Dynamic Properties of Temperature and Frequency-Dependent Properties of Damping Layer on Vibration Characteristics of Ballastless Track

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工况	T/℃	减振垫层本构模型
1	20	K-V模型
2	40	FVMP模型
3	20	FVMP模型
4	-40	FVMP模型