行车激励条件下弹性扣件弹条模态频率试验分析  

Modal Frequency Test Analysis of Elastic Fastener Clips under Train Excitation

作　　者：秦俊飞 张用兵 曾飞 卢洪超 王志强 王金朝 QIN Junfei;ZHANG Yongbing;ZENG Fei;LU Hongchao;WANG Zhiqiang;WANG Jinzhao(Luoyang Ship Material Research Institute,Luoyang Sunrui Rubber and Plastic Science and Technology Co.,Ltd.,Luoyang 471000,Henan,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510006,China)

机构地区：[1]中国船舶重工第七二五研究所,洛阳双瑞橡塑科技有限公司,河南洛阳471000 [2]华南理工大学土木与交通学院,广州510006

出　　处：《噪声与振动控制》2020年第4期235-240,共6页Noise and Vibration Control

摘　　要：为探讨地铁轨道用弹性扣件弹条在行车激励作用下与无载状态下模态频率之间区别,对某弹性扣件DI型弹条进行无载状态下的锤击试验及行车状态下的振动测试,获得弹条无载状态下的传递函数及行车激励作用下的振动响应信号。采用随机子空间法对行车激励作用下弹条的振动响应信号进行模态分析,得到弹条固有振动频率,同时借助钢轨振动信号剔除虚假模态。结果表明在0~1500 Hz范围内在无载状态下弹条模态对应频率为622 Hz;行车激励作用下在0~1500 Hz范围内弹条振动模态对应频率为594.75 Hz。试验结果说明车载状态下弹条固有频率有一定程度下降,在弹条振动评估中应充分考虑行车激励作用对弹条固有频率的影响,以行车激励作用下模态作为评判标准。The difference of fastener clip’s modal frequency between non-loading state and under train operating excitation was explored.A fastener clip of DI type was selected to conduct a hammering test in the non-loading state and the vibration test under train operating excitation.The fastener clip’s transfer function in the non-loading state and its vibration response signals under train operating excitation were obtained.Subsequently,the vibration response signals under train driving excitation were analyzed by stochastic subspace identification,and the natural frequencies of the clip were obtained.Meanwhile,the false modals were eliminated with the help of rail foot vibration signal.The result show that for fastener clip in the non-loading state,there was a peak in 0-1500 Hz and the corresponding frequency is 622 Hz;for fastener clip under train operating excitation,the corresponding frequency is 594.51 Hz.The modal frequency of the clip under train operating excitation declines in comparison with the non-loading state.Therefore,the influence of train operating excitation on the natural frequency of the fastener clips should be considered in the fastener vibration evaluation and the modals under train operating excitation should be taken as the standard for estimating the vibration of elastic fastener clips.

关 键 词：振动与波 行车激励 无载 弹性扣件弹条 传递函数 模态参数识别 

分 类 号：O422.6[理学—声学]