高速动车组车体异常振动问题的模态试验

Abnormal Carbody Vibration Modal Test of High-speed EMU

随着动车组运行速度的提升,高速动车组车体异常振动的问题时有发生,严重影响车辆疲劳寿命及乘坐舒适性。对某型动车组进行整车模态分析,通过与对照组比对不同线路、不同速度、内端墙设置情况及轮对镟修情况等参数,研究整备状态下车体一阶模态频率的变化趋势。试验结果表明,随着运行速度由300 km/h提升至350 km/h,被测动车组的菱形振动主频率降低,且频响幅值略有增加;车体菱形振动主频随着等效锥度的增加下降明显,且未设置内端墙的车体菱形振动主频下降更加严重。

With the increase of EMU(electric multiple unit)speed,the abnormal carbody vibration of high-speed EMU occurs frequently,which seriously affects the vehicle fatigue life and riding comfort.The whole vehicle modal analysis of a type of EMU is carried out.By comparing the parameters such as different lines,different speeds,inner end wall settings and wheelset reprofiling condition with the control group,the change trend of the first-order modal frequency of carbody in servicing state is studied.Test results show that the rhombic vibration main frequency of the tested EMU decreases while the running speed elevates from 300 km/h to 350 km/h,and the frequency response amplitude increases slightly;with the increase of equivalent taper,the main frequency of carbody rhombic vibration decreases obviously,while the main frequency decrease of carbody without inner end wall setting is more serious.