滚动振动试验台模态试验测试与振动抑制研究  

Research on Modal Test and Vibration Suppression of Railway Roller Rig

作　　者：胡运雄 陈晓 张登科 HU Yunxiong;CHEN Xiao;ZHANG Dengke(CRRC Zhuzhou Locomotive Co.,Ltd.,Zhuzhou 412001,China)

机构地区：[1]中车株洲电力机车有限公司,湖南株洲412001

出　　处：《机械》2024年第7期52-59,共8页Machinery

摘　　要：针对某机车车辆滚动振动试验台的异常振动问题进行测试分析研究。对试验台开展了振动模态测试和振动抑制措施研究。通过分析试验台在空载和负载两种情况下模态测试结果以及短时傅里叶变换分析,得出了试验台振动的时频谱和主要参振模态;通过对试验台进行有限元建模,提出了增加纵向加强杆以增加试验台的刚度来提升模态频率,以实现振动抑制的目的。综合对比测试结果,发现车轮转频与试验台点头模态或摇头模态存在耦合现象,从而导致了振动放大,这也是导致异常振动的主要原因。针对异常振动问题,结合现场实测数据得出增加纵向连接杆可以降低振动的结论。In this paper,testing and analysis of the abnormal vibration problem of the railway roller rig for locomotive is conducted,including vibration modal testing and research on vibration suppression measures.Through the analysis of the modal test results of the test rig under non-load and load conditions and the short-time Fourier transform analysis,the time-frequency spectrum and main vibration modes of the test rig are obtained.Through the finite element modelling of the test rig,the method of adding longitudinal reinforcement rods to increase the rig's stiffness is proposed,which raises the modal frequency and thus achieves the goal of vibration suppression.The test results reveal a coupling phenomenon between the wheel rotaion frequency and the test rig’s nodding head mode or shaking head mode,leading to the amplification of vibration,which is the main cause of abnormal vibration.To address the abnormal vibration problem,on the basis of the actual field measurement data,it is concluded that adding a longitudinal connecting rod could reduce the vibration.

关 键 词：滚动振动试验台 异常振动 模态测试 刚度 

分 类 号：TH69[机械工程—机械制造及自动化]