摘要
通过线路测试获取CR400BF 400 km/h运行条件下主要车下设备激励的振动特性,考虑不同设备安装形式对振动特性的影响,采用统计容差法、包络法、疲劳损伤谱等方法归纳不同方向车下设备随机振动实测谱和规范谱,并与GB/T 21563—2018进行对比及标准适用性分析。结果表明:400 km/h条件下弹性安装设备振动RMS均低于标准值,刚性安装设备横向RMS为0.391 9 m/s^(2),超出标准值0.37 m/s^(2);车下设备均存在由轨道P2力引起的40~50 Hz激励主频,与标准5~20 Hz振动主频存在明显差异;标准谱作为考察400 km/h弹性安装结构的载荷谱相对保守,对400 km/h刚性安装设备的适用性较差。基于Dirlik应力分布模型,推导出双斜率S-N曲线下激励放大倍数同疲劳寿命比例呈现双对数变化关系,以动车组污物箱为例,获取不同疲劳标准下加速试验时间同加速比之间的关系,为随机振动台架试验提供参考。
The vibration characteristics of CR400BF equipment excitation under 400 km/h are obtained through line test.Considering the influence of installation forms,the statistical tolerance method,envelope method,fatigue damage spectrum and other methods are adopted to summarize the vibration spectrum of under-vehicle equipment in different directions,comparation with GB/T 21563 is conducted,and the applicability of the standard is analyzed.The results show that the vibration RMS of the elastic mounted equipment under 400 km/h is lower than the standard value,and the transverse RMS of the rigid mounted equipment is 0.3919 m/s^(2),which is more than the standard value of 0.37 m/s^(2).All equipments have the excitation main frequency of 40-50 Hz caused by the P2 force,which is significantly different from the standard vibration main frequency of 5-20 Hz.The standard spectrum is relatively conservative as the load spectrum of the 400 km/h elastic mounting structure,which is less applicable to the 400 km/h rigid mounting equipment.Based on the Dirlik distribution model,a double logarithmic relationship between the excitation amplification and the fatigue life under the double-slope S-N curve is deduced.Taking the EMU sewage bins as an example,the relationship between the acceleration test time and acceleration ratio under different fatigue standards is obtained,which is a reference for the random vibration bench test.
作者
姜春龙
程亚军
张红卫
于春洋
张晓松
曾一鸣
JIANG Chunlong;CHENG Yajun;ZHANG Hongwei;YU Chunyang;ZHANG Xiaosong;ZENG Yiming(CRRC Changchun Railway Vehicles Co.,Ltd.,National Engineering Research Center for Railway Vehicle,Changchun 130113,China;China Academy of Railway Sciences Co.,Ltd.,Beijing 100081,China)
出处
《大连交通大学学报》
2025年第6期49-57,119,共10页
Journal of Dalian Jiaotong University
基金
中国国家铁路集团有限公司科技研究开发计划课题(P2023J001-1)。
