城际列车车下变压器弹性吊挂刚度设计

Stiffness Design of Elastic Suspension for Transformer under the Intercity Train

对某城际列车车下变压器弹性吊挂的刚度(吊挂刚度)进行设计,在设计过程中,先根据隔振理论确定车下吊挂变压器系统的固有频率(吊挂频率)范围,再依据吊挂频率范围,确定吊挂刚度设计范围,将不同吊挂刚度依次建入模型,对比分析变压器激励下车体地板的频率响应特性及空气弹簧激励下车辆的运行舒适度,依据对比分析结果,确定吊挂系统的最优吊挂频率为5 Hz,采用该弹性吊挂的车辆与采用刚性吊挂方式的车辆相比,车体地板垂向振动加速度大幅衰减,并且车辆运行舒适度也明显提高,这表明所采用的设计方法正确。

By designing the stiffness of elastic suspension for the transformer under an intercity train, the natural frequency range of the transformer system(suspension frequency) based on the vibration isolation theory was determined during the design process. Then, the design scope of suspension stiffness was obtained according to the suspension frequency range and different suspension stiffness was established. The frequency response characteristics of bodywork floor under transformer excitation and the running comfort of the vehicle under air spring excitation were analyzed and compared. According to the results of comparative analysis, the optimal suspension frequency of the suspension system was 5 Hz. By comparing the vehicle using this elastic suspension with the vehicle using rigid suspension, the vertical vibration acceleration of the bodywork floor was greatly attenuated and the running comfort of the vehicle was obviously improved, which indicated that the design method adopted was correct.