车下设备悬挂参数与车体结构之间匹配关系研究

Matching relations between equipment suspension parameters and a carbody structure

通过建立等效欧拉梁车体与设备垂向耦合振动模型,研究车下设备刚性悬挂与弹性悬挂对车体振动的影响。研究结果表明,车下设备采用弹性悬挂的设计方式能够有效抑制车体的弹性振动。为研究车下设备弹性悬挂参数与车体结构之间的匹配关系,基于模态叠加法原理法建立考虑车体弹性振动和车下设备的高速动车组刚柔耦合动力学模型。通过该三维模型分析车下设备质量偏心和弹性悬挂参数对车体振动响应的影响规律。仿真结果表明,车下设备横向偏心主要影响车体的横向振动特性,而车下设备纵向偏心主要影响车体的垂向振动特性;当车下设备的悬挂频率接近车体的垂向弯曲频率时能够降低车体的整体振动水平,而当车下设备的悬挂频率低于车体的垂向弯曲频率时,提高车下设备弹性悬挂系统的阻尼能在一定程度上抑制车体的弹性振动。

Here, the vertical dynamic model of coupling between a carbody and equipment was built to study different influences of rigid suspension design of equipments and flexible suspension design of equipments on carbody vibration. Results showed that the flexible suspension design can effectively suppress the elastic vibration of the carbody. In order to study the matching relation between suspension parameters of equipments and carbody structure, a hybrid muhibody dynamic model of EMU was set up based on the modal superposition method, considering carbody elastic vibration and equipments. The influence of equipments partial load and suspension parameters on carbody vibration were analyzed. It was observed that the lateral partial load affects the lateral ride index of the carbody and the longitudinal partial load mainly affects the vertical ride index of the carbody; when the flexible suspension frequency of equipments is close to the carbody bending frequency, the minimum vibration of the carbody occurs ; but, as the suspension frequency of equipments is less than the carbody bending frequency, increasing damping can suppress the carbody vibration.