动力吸振器刚度和阻尼偏差对浮置板轨道低频振动控制的影响

Influences of Stiffness and Damping Deviations of Dynamic Vibration Absorber on Low-frequency Vibration Control of Floating Slab Track

针对动力吸振器在浮置板轨道上的应用问题,基于扩展定点理论和车辆-轨道耦合动力学理论,对动力吸振器的刚度和阻尼偏离最优值情况下的浮置板轨道低频域(<32 Hz)振动控制效果进行分析。以钢弹簧浮置板轨道为例,建立附加吸振器的浮置板轨道有限元模型,并结合车辆-轨道耦合动力学模型进行仿真分析。计算结果表明:当吸振器阻尼偏离最优值时,浮置板位移响应在固有频率附近出现两个明显的峰值,且在偏差-75%工况下,吸振器对轨道板综合振动控制效果比最优参数工况降低2.1 d B;当刚度偏差在125%以内时,浮置板位移响应在固有频率左侧出现较为明显的峰值,且在偏差75%工况下,吸振器对轨道板综合振动控制效果增加0.5 d B。

Focusing on the problems in the application of dynamic vibration absorber（ DVA） on the floating slab track（ FST）,this paper studies the vibration control of a FST in low frequency zone（ 32 Hz） based on the theories of extended fixed-point and vehicle-track coupling dynamics in the case that the stiffness and damping coefficients of DVA deviate from the optimal values. For a steel spring FST,its finite element model is established when DVA is applied,which is then incorporated into the vehicletrack coupled dynamics model to perform simulation analysis. The calculation results show that when the damping coefficient of the DVA is not at its optimal value,there are two obvious peaks generated by the vibration displacement responses of the FST near its natural frequency,and the comprehensive vibration control effect of the FST in low frequency zone is reduced by 2. 1 dB under the condition that the damping deviation arrives-75%. When the stiffness deviation is less than 125%,a obvious peak generated by the vibration displacement response appears at the frequency less than the natural frequency,and the comprehensive vibration control effect on the FST in low frequency zone is increased by 0. 5 dB with 75%stiffness deviation.