|
|
Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly
2025 Vol.26 No.6 P.585-604
Vibration characteristics of ballastless track and its effect on wheel–rail broadband dynamic interaction
Abstract: The wheel–rail dynamic load (WRL) and its vibration energy transfer (VET) are foundational for studying ballastless track dynamics in high-speed railways. In this study, the higher-order modal parameters of track beds with different isolating layers were identified experimentally and a vehicle–track coupled dynamic model considering track bed broadband vibrations (TBBVs) was established. The WRL and its VET were investigated, and the contribution law as well as the influence mechanism of TBBVs on them was determined. The results showed the WRL and track bed vibration energy exhibited significant resonances, with more prominent high-frequency resonance peaks in the track bed vibration energy. TBBVs had a significant effect on low-frequency WRLs, and markedly influenced the VET across various frequency bands. Intense low-frequency and weak high-frequency intermodulation effects between the wheel–rail and track beds were observed. The effect of track bed vibrations can be disregarded when focusing on high-frequency WRLs above 200 Hz. Variations in the isolating layer stiffness have more significant effects on the track bed vibration energy than the WRL. Rational stiffness of the isolating layer should be selected to avoid mode-coupling resonance from track beds to the wheel–rail subsystem.
Key words: Ballastless track; Higher-order modal testing; Wheel–rail dynamic load (WRL); Vibration energy transfer (VET); Intermodulation effect; Rational stiffness
机构：1中国矿业大学，力学与土木工程学院，中国徐州，221116；2北京交通大学，土木建筑工程学院，中国北京，100044；3中国铁道科学研究院集团有限公司，铁道建筑研究所，中国北京，100081；4中国铁道科学研究院集团有限公司，金属及化学研究所，中国北京，100081；5高格特理工学院，机械工程系，印度贝尔高姆
目的：明确轮轨动载及其在无砟轨道中传递规律对提升高铁轨道动力学性能具有的重要意义。本文旨在探讨无砟道床自身振动特性对轮轨动载及其振动能量传递的贡献规律，以及阐明无砟道床参振对轮轨宽频动态相互作用的影响机理。
创新点：1.首次通过现场试验辨识了铺设不同隔离层（土工布、缓冲垫层等）下无砟道床的高阶模态参数；2.构建了精细考虑无砟轨道宽频振动特性的车辆-轨道动态相互作用分析模型；3.从模态互调的角度阐明了无砟道床参振对轮轨宽频相互作用的贡献规律和影响机理。
方法：1.通过布设密集的激励点和多个非对称排列的响应点，并结合每个响应点相干函数的实时评估及优化，辨识出无砟道床的高阶模态参数（图4和5）；2.融合试验辨识模态和理论仿真模态，并运用模态叠加法精细构建车辆-无砟轨道相互作用模型（图6）；3.基于无砟道床和轮轨子系统各自模态分析以及耦合下模态互调分析，阐明无砟道床参振对轮轨宽频相互作用的影响机理（图21~23）。
结论：1.无砟道床参振仅对轮轨低频动载有显著贡献，而对无砟轨道全频段振动能量传递规律均有影响；2.无砟道床和轮轨子系统间分别在低频和高频存在强烈和微弱的模态互调效应，而当聚焦在200 Hz以上的轮轨高频动态相互作用时可忽略无砟道床参振的影响；3.隔离层合理刚度的选取应避免无砟道床与轮轨子系统间的模态耦合共振，以减弱无砟轨道的振动能量。
关键词组：
References:
Open peer comments: Debate/Discuss/Question/Opinion
<1>
DOI:
10.1631/jzus.A2400462
CLC number:
Download Full Text:
Downloaded:
187
Download summary:
<Click Here>Downloaded:
7Clicked:
240
Cited:
0
On-line Access:
2025-06-25
Received:
2024-09-28
Revision Accepted:
2025-02-24
Crosschecked:
2025-06-25