摘要
针对动车组车体悬挂设备冲击与振动疲劳损伤问题,以某型动车组牵引变压器冷却单元为研究对象,根据IEC61373-2010标准确定冷却单元的载荷工况,运用大质量点法进行计算分析,采用Miner疲劳损伤累计法则对其结构进行振动疲劳强度评估。研究结果表明:冷却单元钢结构在冲击工况下未发生塑性变形,满足强度设计要求;在振动载荷下,冷却单元钢结构在三向各振动5h后未发生疲劳失效,满足疲劳设计要求;疲劳薄弱位置位于钢结构纵梁与横梁焊接处,以及两根纵梁之间角钢焊缝处,需要注意这些位置的焊接质量。
For researching the impact and vibration fatigue characteristics of train body suspension equipments of multiple unit,the load conditions of traction transformer cooling unit of multiple unit were defined according to IEC61373-2010 standard,this paper use the method of large mass points to calculate and analyze,the vibration fatigue strength of cooling unit was analyzed by Miner fatigue summation principle. The result shows that the cooling unit steel structure has not occurred plastic deformation under impact condition,and satisfies the requirement of strength design. The cooling unit steel structure has not occurred fatigue failure after three-dimensional vibration five hours,and meets the fatigue design requirements. The fatigue weak positions are located in weld between longitudinal beam and the cross beam of steel structure,the angle steels weld between the two longitudinal beams,welding quality should be paid attention in these positions.
出处
《科技通报》
2018年第1期249-253,共5页
Bulletin of Science and Technology
基金
国家自然科学基金项目(51505390)
国家科技支撑计划项目(2015BAG12B01-15)
关键词
动车组
冷却单元
大质量点法
冲击强度
振动疲劳
multiple unit
cooling unit
large mass points method
impact strength
vibration fatigue
