摘要
针对高速动车组在运营过程中出现的垂向止挡异常振动,且个别存在明显断裂裂纹的典型振动问题,基于现场车轮粗糙度与振动响应同步测试,分析了镟修前后的车轮非圆特征及其对轴箱及垂向止挡振动特性的影响;采用试验与计算相结合的垂向止挡模态分析,确定了垂向止挡的模态特性,据此分析了高速动车组垂向止挡异常振动的成因。结果表明,测试的高速列车动车组车轮存在较为明显的25~27阶多边形,在192 km/h运营速度下,会对轴箱和垂向止挡形成显著的515Hz频率振动激励。而垂向止挡一阶弯曲模态频率也为510 Hz,且其模态应变最显著区域与断裂裂纹位置一致。由此可判断垂向止挡异常振动是车轮多边形激励引起垂向止挡结构共振所致。车轮镟修可有效减缓或抑制其异常振动,相关研究可为高速动车组减振降噪提供参考。
Aiming to the typical vibration problem of the abnormal vibration of the vertical block and individually obvious fracture cracks in the operation of high-speed EMUs, the wheel roughness characteristics before and after reprofiling and the influence to the vibration characteristics of the axle box and the vertical block are analyzed based on field test of wheel roughness and vibration response. The modal characteristics are obtained by using the vertical block mode analysis with the combination of experiment and calculation. The causes of the abnormal vibration of the vertical block of high-speed EMUs are analyzed. The results show that the 25-27 order polygons are existed on the wheel. At the speed of 192 km/h, a significant 515 Hz vibration excitation is formed to the axle box and vertical block. The first order bending mode frequency of the vertical block is also about 510 Hz and the most significant area of modal strain is the same as the fracture crack position. Therefore, it can be concluded that the abnormal vibration of the vertical block is caused by the structural resonance which is excitated by wheel polygonization. The abnormal vibration is significantly reduced or restrained due to reprofile. This study provides the reference for vibration and noise reduction of high-speed EMUs.
作者
彭来先
韩健
初东博
高阳
李志辉
肖新标
PENG Laixian;HAN Jian;CHU Dongbo;GAO Yang;LI Zhihui;XIAO Xinbiao(State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031;CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130062)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2019年第12期121-127,共7页
Journal of Mechanical Engineering
基金
国家重点研发计划(2016YFB1200506-08,2016YFB1200503-02)
国家自然科学基金(51475390,U1434201)
中国铁路总公司科技研发开发计划课题(2016G008-F/2016G08-G)资助项目
关键词
高速动车组
振动特性
车轮多边形
垂向止挡
共振
high-speed emu
vibration characteristic
polygonal wheels
vertical block
resonance
