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61HZ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。
Abstract
The temperature-frequency variable dynamic mechanical model of the rail fastener is established by combining the principle of temperature-frequency equivalence and the high-order fractional derivative FVMP model through the constant-frequency variable-temperature test of the fastener, and the newly-built model is used for simulation in the vehicle-track-bridge vertical coupling system Fasteners. Then, based on the power flow method to systematically analyze and evaluate the influence of dynamic mechanical parameters for the rail fasteners relating to environmental temperature and exciting frequency on the vibration energy distribution and transmission of the track structure. The conclusions indicate that considering the frequency-dependent dynamic parameters of the rail fasteners, the vibration energy of the track structure in the middle-high frequency bands would be increased, and the vibration energy of the track structure in the low frequency-domain random would less affected. Moreover, it had a great impact on the vibration energy transmitted from the rail to the track plate. However，it had little influenced on vibration energy transfer of bridge, But has little effect on the vibration energy transfer of the bridge; With reduction of temperature the vibration energy of the track structure would increases, and the vibration energy transmitted to the track plate in the middle-high frequency bands after 61HZ would increases. Meanwhile, it had a small effect to the vibration energy transmission of slabs and bridges; the temperature-frequency change of fasteners has a greater impact on the distribution of vibration energy of the track structure, but has a small effect on the energy transmission of the under-rail structure. Therefore, the temperature-frequency characteristics of fasteners must be considered when solving the vibration energy of the track and bridge coupling, otherwise it will be difficult to accurately predict the vibration energy distribution characteristics of the track structure.
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
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Key words
temperature frequency variation characteristics /
FVMP model；vehicle-rail-bridge coupled vibration /
power flow /
vibration energy
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