车辆-轨道耦合作用下桥上减振双块式无砟轨道减振性能研究  

Study on the vibration reduction performance of double-block ballastless damping track on bridge under vehicle-track coupling effect

作　　者：付娜[1] 李成辉[1] 赵振航 亓伟[1] FU Na;LI Chenghui;ZHAO Zhenhang;QI Wei(MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《铁道科学与工程学报》2018年第5期1095-1102,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51278431);国家杰出青年科学基金资助项目(51425804);高速铁路基础研究联合基金重点资助项目(U1334203&U1234201)

摘　　要：基于车辆-轨道耦合动力学理论,建立高速铁路车辆-轨道-桥梁耦合模型,采用有限元法,分别研究双块式无砟轨道结构中减振垫对轨道和桥梁时域、频域动力性能的影响,并研究其减振效果。研究结果表明:在时域内,减振双块式无砟轨道使钢轨、道床板的竖向位移增加,并且使道床板梁端竖向位移显著增加;使钢轨、道床板竖向加速度增加,使桥梁跨中竖向加速度明显减小。在频域内,减振双块式无砟轨道使桥梁加速度振级减小5 d B,减振效果良好,并且在10~40 Hz频率范围内减振效果最明显。然而,道床板加速度振级增加了8 d B。减振垫使振动能量更多地滞留在道床板内,对道床板的正常使用不利。According to the vehicle-track coupling dynamics theory, a high-speed railway vehicle–track-bridge coupling model is established in this article. And by FFM method, the dynamic responses of the track and bridge in the double-block ballastless damping track structure are studied respectively both in time domain and in frequency domain. Besides, the damping effect of the rubber damping layer is also studied. The results show that, in time domain, the vertical displacement of rails and slabs increase and the vertical displacement of the slab at the end of the bridge increases dramatically. The vertical acceleration of rails and slabs also increase, but the vertical acceleration at the middle of the bridge decreases. In frequency domain, the acceleration vibration level of the bridge decreases by 5 dB which demonstrates a good damping effect of the damping layer. Moreover, it makes an obvious damping effect from10~40 Hz. However, the acceleration vibration level of the slabs increases by 8 dB. Obviously, after sentry the damping layer in the track structure, much more vibration energy is stored in the slabs which is unfavorable to the slab performance.

关 键 词：双块式无砟轨道 减振 车辆轨道耦合动力学 1/3倍频程 

分 类 号：U213.244[交通运输工程—道路与铁道工程]