一系钢簧断裂原因分析与高频激励试验研究
Reserch on Causes of Fracture and High-frequency Excitation Test of Primary Springs
高程程 1魏博文 1王勇 2孙希忠 1赵荷花1
作者信息
- 1. 青岛工程职业学院,山东 青岛,266112
- 2. 西南交通大学,四川 成都,610031
- 折叠
摘要
为分析某型号动车组一系钢簧断裂的原因,对装配有该钢簧的转向架进行高频激振试验,结合有限元仿真计算,确定钢簧具有 72 Hz的固有频率.绘制钢簧频响特性曲线发现,72 Hz频率下的应力幅值约是其余频率激励下的 30倍.计算线路枕跨冲击频率,分析得出该型号动车组钢簧发生断裂原因是列车以155 km/h时速运行时会受到来自轨枕的 71.7 Hz的冲击,此频率与钢簧扭转模态频率接近,钢簧发生共振,长此以往导致钢簧断裂.
Abstract
In order to analyze the reasons for the primary spring fracture of a certain type of EMU,high-frequency excitation tests were conducted on the bogies assembled with the steel springs,and the inherent frequency of the steel springs was determined to be 72 Hz by combining finite element calculations.By plotting the frequency response characteristic curve,it is obtained that the stress amplitude at 72 Hz is about 30 times higher than the rest of the frequency excitation.Through the theoretical calculation of the cross-impact frequencies of the line,it is found that the reason for the fracture of the steel spring of the EMU is that the train is subjected to a 71.7 Hz shock from the rail sleeper when running at 155 km/h.This frequency is close to the torsional mode frequency of the steel spring,and the steel spring resonates,causing it to fracture in the long run.
关键词
动车组/一系钢簧/模态分析/台架试验/动应力Key words
EMU/primary springs/modal analysis/bench test/dynamic stress引用本文复制引用
基金项目
中国国家铁路集团有限公司系统性重大项目(P2021J003)
出版年
2024
国家科技期刊平台
NSTL
万方数据