车下有源悬吊设备与车体耦合振动研究

通过对我国高速动车组进行线路试验,发现车下有源旋转设备的不平衡质量所引发设备颤振会与车体地板发生耦合振动,影响车辆动力学性能。为研究有源车下设备与车体耦合振动特性,考虑车体的弹性振动,建立车体与车下悬吊设备的刚柔耦合动力学模型,分析有源旋转设备不平衡量对设备和车体振动的影响。结果表明,有源设备在特定频率范围内容易激发车体的低阶模态,随着不平衡量增加,导致车体振动逐渐增大。为减小车下有源设备振动对车辆动力学性能影响,进行有源设备悬挂参数匹配研究,得出最佳悬挂刚度和阻尼;同时提出有源旋转设备的两级隔振方案,研究发现两级隔振方案能够有效降低车体垂向振动,最大可减小约26%。

Study on the Coupled Vibration of Underframe Active Rotational Equipment and Carbody

Based on the test of high-speed trains, the results show that the unbalance of the quality of the active rotating equipment under the vehicle will cause the coupling vibration of the equipment and the train floor, which impact on vehicle dynamics performance. In order to study the coupling vibration characteristics of active vehicle and vehicle body, considering the elastic vibration of carbody, based on the rigid flexible coupling dynamic model of the vehicle body and the vehicle suspension equipment, analyzing the influence of the unbalance of the active rotating equipment on the vibration of the equipment and the car body is analyzed. The results show that the low order mode of active devices in the specific frequency range, with the increase of unbalance, the vibration of car body increases gradually. To reduce the influence of the vibration of the active equipment on the dynamic performance of the vehicle, study on the suspension parameters matching of active equipment, obtain the optimal suspension stiffness and damping. At the same time, the two stage vibration isolation scheme is proposed. It is found that the two stage vibration isolation scheme can effectively reduce the vertical vibration of carbody, with a maximum reduction of about 15% at a certain speed.