低频域多模态制振轨道板设计

Multi-mode Vibration Attenuation Track in Low-Frequency Domain

针对城市轨道交通引起的低频环境振动现象,基于扩展定点理论、模态分析、有限单元法和车辆-轨道耦合动力学理论,研究了低频域多模态制振轨道板的设计方法,建立了车辆-被动式动力减振浮置板轨道耦合动力学模型.研究结果表明：多模态制振浮置板在10～20 Hz范围内的加速度振动级明显减小,有效抑制了常规浮置板因共振放大低频振动的现象;附加动力吸振器质量比越大,浮置板振动加速度插入损失也越大,当控制1阶和2阶模态的动力吸振器质量比为0.2时,最大插入损失达15 d B;多模态制振浮置板对轮对振动的抑制作用较弱,对构架的振动几乎没有影响。

For the phenomenon of low-frequency environmental vibration caused by the urban rail transit,based on the extended fixed-point theory,the passive vibration controlling technology,the finite element method and the vehicle-track coupling dynamics,a design method is developed to analyze the multi-mode vibration attenuation characteristics of the passive dynamic damping floating slab track（ PDD_FST） in low-frequency domain,and a coupled vehicle-PDD_FST dynamics model is established. The results show that PDD_ FST could effectively suppress the resonant vibration in the range of 10-20 Hz. The greater the mass ration of the attached dynamic vibration absorber（ DVA） to the PDD_FST is,the greater the insertion loss of the FST acceleration is. If the mass ratio of the DVAs controlling the 1st and 2nd order mode vibration is 0. 2,the max insertion loss reaches up to 15 d B.PDD_FST has less influence on the wheelset＇s vibration and no influence on the car body and bogie＇s vibration.