摘要
针对某城轨列车高度阀连接杆断裂失效现象,对高度阀连接杆进行了断口形貌分析;同时对列车进行了运行测试,连接杆处最大加速度值可达约56 g,出现在部分小曲线区间内;振动加速度并未随列车速度的提高而增加;连接杆关键部位的等效应力幅值明显超过材料的疲劳应力许用值。分析结果表明:该断裂失效的主要原因是振动引起的疲劳断裂。可通过钢轨打磨减轻轨道的周期性激扰,或通过优化连接杆结构避免最大振幅出现在螺纹处。
According to a fracture failure of the height control valve connecting rod for urban rail vehicle,the fracture morphology was analyzed.Meanwhile,the running test results of the train illustrated that the maximum acceleration value at the connecting rod was about 56 g,which appeared in some small-radius curve sections.The vibration acceleration of the connecting rod was not increasing with the rising of running speed.The equivalent stress amplitude at the key position of the connecting rod exceeded the allowable fatigue stress value of the material remarkably.The analysis results indicated that the main cause of the failure is the fatigue fracture caused by vibration.It was suggested to grind the track to reduce the periodic disturbance,or optimize the structure of the connecting rod to avoid the maximum vibration amplitude occurring at the thread.
作者
曹伯楠
李辉
焦标强
赵彦利
赵立强
张永珍
CAO Bonan;LI Hui;JIAO Biaoqiang;ZHAO Yanli;ZHAO Liqiang;ZHANG Yongzhen(Locomotive&Car Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Beijing Zongheng Electro-Mechanical Technology Co.,Ltd.,Beijing 100094,China;Tieke Zongheng(Tianjin)Technology Development Co.,Ltd.,Tianjin 301700,China)
出处
《铁道机车车辆》
北大核心
2025年第6期156-164,共9页
Railway Locomotive & Car
基金
中国国家铁路集团有限公司科技研究开发计划重大课题(K2023J005)
中国铁道科学研究院集团有限公司重大项目(2022YJ317)。
关键词
城轨列车
高度阀
连接杆
疲劳断裂
优化措施
rail vehicle
height control valve
connecting rod
fatigue fracture
optimizing method
