Due to local resonances, high vibration levels occur frequently in high-speed train floor, which impact on the ride comfort negatively. A method to control excessive local vibration with multiple dynamic vibration absorbers (DVAs) is presented. Firstly, possible causes of the high vibration levels are investigated with operational and modal tests. Then a model of the vehicle body with multiple DVAs is established based on the modal superposition method. It is found that a strong peak at the low frequency is dominated by a single mode, which can be attenuated with under-frame equipment as a single DVA. In the frequency region between 30 and 35 Hz several local modes contribute, and are controlled with multiple DVAs. Methods are studied to determine the optimal parameters for these DVAs, including location, natural frequency and mass. For a single DVA conventional fixed-point theory is used, whereas for multiple absorbers an optimization method is proposed. Finally, the effect of the optimization is verified in a full vehicle model with frequency responses analysis. The results indicate that the proposed method can reduce the vibration of targeted modes and improve the ride quality considerably in terms of the vertical motion.

由于局部共振，高速列车地板经常出现高振动水平，这对乘坐舒适性产生负面影响。提出了一种利用多个动态吸振器 (DVA) 控制过度局部振动的方法。首先，通过操作和模态测试研究了高振动水平的可能原因。然后基于模态叠加法建立了具有多个DVA的车身模型。发现低频处的强峰值由单模主导，可以通过帧下设备作为单个DVA进行衰减。在 30 和 35 Hz 之间的频率范围内，有几个局部模式起作用，并由多个 DVA 控制。研究了确定这些 DVA 的最佳参数的方法，包括位置、固有频率和质量。对于单个 DVA，使用传统的定点理论，而对于多个吸收器，提出了一种优化方法。最后，通过频率响应分析在整车模型中验证了优化的效果。结果表明，所提出的方法可以减少目标模式的振动，并在垂直运动方面显着提高乘坐质量。