多重动力吸振器对高速列车地板振动的控制

针对某高速动车组线路运行时出现的地板局部振动问题,通过线路试验发现地板在33 Hz附近存在局部振动放大现象,为解决该问题,基于多自由度结构振动原理,建立包含多重动力吸振器(MDVAs)的地板振动控制模型,分析了多重动力吸振器控制地板振动的最优调谐参数,并对动力吸振器控制效果进行了验证。结果表明,安装位置会对控制效果产生明显影响,吸振器安装应尽量选择振型最大处安装,吸振器参数的控制效果不会随参数变化而无限增加。采用地板动力吸振方案可有效降低目标频率处的振动,地板时域最大峰值下降约66%,舒适度指标降低0.3。

Floor Local Vibration Control of High Speed Trains by Using Multiple Dynamic Vibration Absorbers

To solve local vibration problems of floor in high-speed EMU(electric multiple unit), a line test is conducted in which it is found that there exists local vibration amplification of 33 Hz in the floor. Based on the principle of multi-degree-of-freedom structure vibration, the floor vibration model with multiple dynamic vibration absorbers is established. The vibration control model is used to analyze the optimal tuning parameters of the multi-dynamic vibration absorber to control the floor vibration. The control effect of the dynamic vibration absorber is verified. The results show that the installation position has a significant impact on the control effect. The vibration absorber should be installed by selecting the maximum vibration mode, and the control effect of the DVA parameter does not increase infinitely as the parameters change. The floor dynamic vibration absorber scheme can effectively reduce the vibration at the target frequency, the maximum peak value of the floor time domain is reduced by about 66%, and the comfort index is reduced by 0.3.