考虑扣件温频变的车轨桥垂向耦合系统振动能量研究  

Vibration energy of vehicle-rail-bridge vertical coupled system considering fastener temperature frequency variation

作　　者：刘林芽[1] 李辉 秦佳良 左志远 孟宪金 LIU Linya;LI Hui;QIN Jialiang;ZUO Zhiyuan;MENG Xianjin(MOE Engineering Research Center of Railway Environmental Vibration and Noise,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]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

出　　处：《振动与冲击》2022年第1期161-168,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51578238,51968025);江西省自然科学基金重点项目(20192ACBL20009);江西省青年科学基金(20202BABL214048)。

摘　　要：通过对扣件进行定频变温试验,结合温频等效原理与高阶分数导数FVMP模型建立扣件的温频变动态力学模型,并在车-轨-桥耦合系统中采用新建模型模拟扣件,基于功率流法系统地分析与评价扣件温频变动态力学性能对车轨桥耦合系统振动能量分布与传递的影响。结果表明:考虑扣件动参数频变会使中高频段内的轨道结构振动能量增大,对低频段的轨道结构振动能量影响较小,且对钢轨传递给轨道板的振动能量影响较大,但对桥梁的振动能量传递影响较小;温度的降低会导致轨道结构的振动能量增大,且会增大61 Hz后中高频段内钢轨传递给轨道板的振动能量,但对桥梁的振动能量传递影响较小;扣件温频变对轨道结构振动能量的分布有较大影响,但对于轨下结构的能量传递影响较小。因此,在轨道桥梁耦合求解振动能量时必须要考虑扣件温频变特性,否则将难以精准预测轨道结构振动能量分布特性。Through constant frequency and variable temperature tests of fasteners,combined with the temperature frequency equivalence principle and the high-order fractional derivative FVMP model,the temperature frequency variable dynamic model of a fastener was established,and the new model was used to simulate fasteners in a vehicle-rail-bridge coupled system.Based on the power flow method,effects of fasteners’temperature frequency variable dynamic properties on vibration energy distribution and transmission of the vehicle-rail-bridge coupled system were systematically analyzed and evaluated.The results showed that considering frequency variation of fastener dynamic parameters can increase vibration energy of the rail structure in medium frequency range and high frequency one,while that has a smaller impact on vibration energy of the rail structure in low frequency range,and that has a larger impact on vibration energy transmitted from rail to track plate,but that has a smaller impact on bridge vibration energy transmission;decrease in temperature can increase vibration energy of the rail structure and vibration energy transmitted from rail to track plate in medium frequency range and high frequency one after 61 Hz,but that has a smaller impact on bridge vibration energy transmission;fastener temperature frequency variation has a larger impact on vibration energy distribution of the rail structure,but has a smaller impact on energy transfer of under-rail structure;temperature frequency variation characteristics of fasteners must be considered when solving vibration energy during rail-bridge coupling,otherwise it is difficult to accurately predict vibration energy distribution characteristics of rail structures.

关 键 词：温频变特性 FVMP模型 车-轨-桥耦合振动 功率流 振动能量 

分 类 号：TB533[理学—物理]