A novel method is proposed to suppress the flexible carbody resonance due to bogie instability by hanging a dynamic vibration absorber (DVA) to the bogie frame. The aim is to design the DVA to change the frequency of the bogie hunting motions, which can ensure the bogie does not operate at the resonant frequency of the objective mode of the flexible carbody. Firstly, the resonance phenomenon of the flexible carbody is introduced. The reason is revealed that the unstable frequency of the bogie hunting motions matches the resonance frequency of the carbody diamond mode, which is identified experimentally by modal testing. Then the unstable behaviour of the bogie with a suspended DVA is studied theoretically by building a simple lateral dynamics model of a bogie system. The basic mechanism of the effect of a DVA on the hunting frequency jump characteristic is explored. It is then adopted to suppress the carbody resonance due to bogie instability in the rigid-flexible multi-body dynamics model of a high-speed railway vehicle. The optimum parameters of the DVA suspension are determined numerically by deigning the unstable frequencies away from the objective natural frequency of the flexible carbody, and its effect on resonance suppression is confirmed.

提出了一种通过在转向架框架上悬挂动态吸振器（DVA）来抑制转向架不稳定引起的柔性车身共振的新方法。目的是设计DVA来改变转向架摆动运动的频率，从而保证转向架不会在柔性车身目标模式的共振频率下工作。首先介绍了柔性车身的共振现象。原因揭示了转向架摆动运动的不稳定频率与车体菱形模态的共振频率相匹配，通过模态测试实验确定。然后通过建立一个简单的转向架系统横向动力学模型，从理论上研究了悬挂DVA转向架的不稳定行为。探讨了 DVA 对振荡跳频特性影响的基本机制。然后采用它来抑制高速铁路车辆刚柔多体动力学模型中转向架不稳定性引起的车体共振。通过设计偏离柔性车身目标固有频率的不稳定频率，数值确定了DVA悬架的最佳参数，并证实了其对共振抑制的影响。