铁道车辆天线梁的随机振动疲劳评估*

摘要

The main reason causing the destruction of the antenna beam is subj ected to random vi-bration excitation transmitted through the frame end.In order to study the fatigue reliability of the antenna beam under Random Excitation,to begin with,the method of random vibration fatigue analysis combined of structural dynamics,random vibration theory and material fatigue is re-searched.Secondly,its random vibration is simulated by using the finite element software Ansys Workbench based on the standard IEC 61373,and finally fatigue damage assessment for serious parts of its stress is completed by the Steinberg method.The result of the overall damage to the antenna beam is 0.56 and it meets Miner linear cumulative damage rule,which shows the fatigue design of antenna beam meets the standard requirements.%引发天线梁破坏的主要原因是受到经构架端部传递的随机振动激扰.为考察天线梁在随机激扰下的疲劳可靠性,首先将结构动力学、随机振动和材料疲劳理论进行结合,研究了随机振动疲劳分析方法,在此基础上,依据标准IEC 61373,采用有限元软件ANSYS Workbench对天线梁进行随机振动仿真,最后采用Steinberg法对其应力较严重部位进行疲劳损伤评估.经分析,得到天线梁的总体损伤为0.56,满足 Miner线性累计损伤准则,表明天线梁的疲劳设计符合标准的相关要求.