铁道车辆−轨道−高架桥耦合系统振动功率流分析

李增光;吴天行

振动与冲击 ›› 2010, Vol. 29 ›› Issue (11) : 78-82,9.

PDF(1768 KB)
PDF(1768 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (11) : 78-82,9.
论文

铁道车辆−轨道−高架桥耦合系统振动功率流分析

  • 李增光;吴天行
作者信息 +

Analysis of Vibration Power Flow for Coupled Railway Vehicle-Track-Viaduct System

  • LI Zeng-guang; WU Tian-xing
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文章历史 +

摘要


为了降低轨道交通中高架桥结构的振动和二次噪声,应减少由轨道传递到高架桥结构的振动能量。本文结合车辆−轨道解析模型和高架桥有限元模型建立了频率域的车辆−轨道−高架桥垂向耦合模型,通过仿真计算分析了轮轨不平顺谱激励下传递到高架桥结构的振动功率流及参数影响。结果表明:对于整体道床轨道,钢轨扣件在高于车轮−轨道系统固有频率的频段具有隔振效果;钢轨扣件刚度减小10倍,则传递到高架桥的总振动功率级降低约10 dB;钢轨垫片阻尼增加一倍,传递到高架桥的总振动功率级降低约1.3 dB;车辆速度提高一倍,传递到高架桥的总振动功率级增加约6.6 dB。






Abstract

The structural vibration and re-radiated noise of viaduct due to railway traffic can be reduced by isolating the vibration energy transmission from the track to the viaduct. A frequency-domain model for analyzing the vibration power flow of the coupled railway vehicle-track-viaduct system is developed. This model consists of an analytical model of vehicle-track subsystem and a finite element model of viaduct, and only the motion in vertical direction is considered. The transmitted vibration power from the track into the viaduct due to the wheel/rail roughness is calculated, and the effects of the stiffness, loss factor of rail pad and the vehicle speed on the transmitted power are investigated. Numerical simulations show that the rail pad can attenuate the vibration energy transmission in the frequency range above the wheel-track resonance frequency for the direct fastening track on viaduct, and its stiffness has notable effects on controlling the re-radiated noise of viaduct. The overall transmitted vibration power level decreases by about 10 dB for a ten-fold decrease in fastener stiffness, and decreases by about 1.3 dB for doubling the loss factor of rail pad, whereas increases by approximately 6.6 dB per doubling in vehicle speed.

关键词

功率流 / 高架桥 / 隔振 / 铁路轨道

Key words

power flow / viaduct / vibration isolation / railway track

引用本文

导出引用
李增光;吴天行. 铁道车辆−轨道−高架桥耦合系统振动功率流分析[J]. 振动与冲击, 2010, 29(11): 78-82,9
LI Zeng-guang;WU Tian-xing. Analysis of Vibration Power Flow for Coupled Railway Vehicle-Track-Viaduct System[J]. Journal of Vibration and Shock, 2010, 29(11): 78-82,9

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