【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。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10dB;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1.3dB;车辆速度提高一倍,传递到高架桥的总振动功率级增加约6.6dB。更多还原

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