基于小波理论的跨坐式单轨车辆振动源研究  

Research on vibration sources of straddle monorail vehicles based on wavelet theory

作　　者：冯大年 丁长权 张建全 丁军君[1,3] FENG Danian;DING Changquan;ZHANG Jianquan;DING Junjun(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;CRRC Zhuzhou Locomotive Co.,Ltd.,Zhuzhou,Hunan 412001,China;State Key Laboratory of Heavy-duty and Express High-power Electric Locomotive,Zhuzhou,Hunan 412001,China)

机构地区：[1]西南交通大学机械工程学院,四川成都610031 [2]中车株洲电力机车有限公司,湖南株洲412001 [3]重载快捷大功率电力机车全国重点实验室,湖南株洲412001

出　　处：《机车电传动》2024年第3期19-27,共9页Electric Drive for Locomotives

基　　金：重载快捷大功率电力机车全国重点实验室开放课题(GZKFKT2022-009);四川省国际科技创新合作项目(2022YFH0038)。

摘　　要：轨道不平顺是跨坐式单轨车辆振动的主要激励源,开展跨坐式单轨车辆振动源研究对于车辆和轨道梁维护具有重要意义。文章基于SIMPACK多体动力学软件建立跨坐式单轨车辆动力学模型,对构架加速度时域信号和不平顺信号进行连续小波变换,以连续小波变换系数为指标进行时频分析,确定车辆振动和不平顺信号能量主要集中的频段;采用交叉小波变换和小波相干方法对多工况下的加速度时域信号进行小波相关性研究,以平均小波相干值评价轨道梁不平顺对车辆横向和垂向振动的贡献度。结果表明:导向面表面不平顺在0.5Hz、2Hz和14Hz处存在横向平均小波相干峰值,分别为0.93、0.71和0.66,垂向平均小波相干值在0.3附近波动;稳定面表面不平顺在6Hz处存在横向平均小波相干峰值(0.44),垂向平均小波相干值在0.3附近波动;走行面不平顺在6Hz处存在横向平均小波相干峰值0.53,垂向平均小波相干值稳定在0.98;轨道梁整体变形产生的不平顺在14Hz处存在横向平均小波相干峰值0.41,在2Hz处存在垂向平均小波相干峰值0.47。Track irregularities are the main excitation source of vibration of straddle monorail vehicles.It is of great significance to study the vibration source of straddle monorail vehicles for vehicle and track beam maintenance.A dynamics model of straddle monorail vehicles was established based on SIMPACK multi-body dynamics software.Continuous wavelet transform was carried out on the time-domain signals of frame acceleration and irregularity signals,and time-frequency analysis was carried out with the continuous wavelet transform coefficient serving as the index to determine the frequency band where the energy of vehicle vibration and irregularity signals was mainly concentrated.Cross wavelet transform and wavelet coherence method were used to study the wavelet correlation of acceleration signals in time domain under multiple working conditions,and the average wavelet coherence value was used to evaluate the contribution of track beam irregularities to lateral and vertical vibration of vehicles.The results show that as for the guide surface irregularity,the transverse mean wavelet coherence peak values are 0.93,0.71 and 0.66 at 0.5 Hz,2 Hz and 14 Hz respectively,and the vertical mean wavelet coherence values fluctuate around 0.3.As for the stable surface irregularity,at 6 Hz,the transverse mean wavelet coherence peak value is 0.44,and the vertical mean wavelet coherence value fluctuates around 0.3.As for the running surface irregularity,at 6 Hz,the transverse mean wavelet coherence peak value is 0.53,and the vertical mean wavelet coherence value is stable at 0.98.As for the irregularity caused by overall track beam deformation,the transverse mean wavelet coherence peak value at 14 Hz is 0.41,and the vertical mean wavelet coherence peak value at 2 Hz is 0.47.

关 键 词：跨坐式单轨 轨道不平顺 动力学 交叉小波 小波相干 

分 类 号：U232[交通运输工程—道路与铁道工程]