摘要
针对某型内燃机车齿轮箱箱体出现裂纹,建立齿轮箱有限元模型,运用随机振动疲劳理论和Palmgren-Miner线性疲劳累积损伤理论进行寿命预测。原始结构的寿命预测与实际统计结果仅相差2.6万公里,并基于原始结构的有限元结果提出两种优化结构,其疲劳预测寿命分别高于原始结构的103.2万公里和176.3万公里。经过模态与激励频率分析,认为横向激励是引起结构共振的主要原因。对比三种结构的模态频率和激励频率发现模态频率对应的激励频率能量值越低,其疲劳寿命越长,在齿轮箱箱体结构优化时应尽量避免高激励能量所对应的频率。
According to the cracks in the gearbox of a certain type of diesel locomotive,the finite element model of gear box was established to make the life prediction by using the random vibration fatigue theory and the linear fatigue cumulative damage theory of Palmgren-Miner. The life prediction of the original structure differs from the actual statistical results by only 26 000 km,and two optimized structures are proposed based on the finite element results of the original structure. The predicted fatigue life of the two optimized structures is higher than that of the original structure by 1. 032 million km and 1. 763 million km respectively.After modal and excitation frequency analysis,it is concluded that transverse excitation is the main cause of structural resonance.By comparing the modal frequency and excitation frequency of the three structures,it is found that the lower the excitation frequency energy value corresponding to the modal frequency is,the longer the fatigue life is. Therefore,the frequency corresponding to the high excitation energy should be avoided when optimizing the structure of the gearbox.
作者
陈超朋
阳光武
肖守讷
朱涛
肖绯雄
高天阳
CHEN ChaoPeng;YANG GuangWu;XIAO ShouNe;ZHU Tao;XIAO FeiXiong;GAO TianYang(Traction Power State Key Laboratory,Southwest Jiaotong University,Chengdu 610031,China)
出处
《机械强度》
CAS
CSCD
北大核心
2021年第2期447-452,共6页
Journal of Mechanical Strength
基金
国家自然科学联合基金项目(U1534209)资助。
关键词
齿轮箱箱体
随机振动
疲劳寿命
共振
结构优化
Gearbox
Random vibration
Fatigue life
Resonance
Structural optimization
