中国机械工程2025，Vol.36Issue(4)：840-849,10.DOI:10.3969/j.issn.1004-132X.2025.04.021
基于虚拟激励法的地铁车辆排障器疲劳失效研究及拓扑优化
Fatigue Failure Study and Topology Optimization of Metro Vehicle Cowcatchers Based on Virtual Excitation Method
摘要
Abstract
The cowcatchers were an important safety guarantee device for metro vehicles.The causes of the cowcatcher failure were investigated by field test and theoretical research.The results in-dicate that the resonance of the cowcatcher contributes to the premature fatigue failure due to the first-order eigenmode frequency(95.7 Hz)which is close to the passing frequency(95 Hz)of the rail corrugation in small-radius curves.Topology optimization design of the cowcatchers was carried out according to the causes of failure based on the mistuning modal design method.The first-order eigen-mode frequency was raised to 160 Hz,and the resonance problems of the cowcatchers were solved.A sub-structure analysis technique was proposed based on the virtual excitation method.A random vi-bration model was established to reproduce the vibration environment of the cowcatchers under real conditions.And the dynamic stresses at key positions was calculated and the results show that the maximum dynamic stress error between simulation and measurement as 1.8％.Finally,the excitation loading method was optimized,and the fatigue life of the cowcatchers was verified based on field test data.The fatigue life of the optimized cowcatchers was calculated by using the Dirlik and the Zhao-Baker method,and the results show that the optimized structure meets the design life requirements of 30 years and 3.6 million kilometers at both of the weld and base material locations.关键词
排障器/钢轨波磨/动应力/虚拟激励/疲劳寿命Key words
cowcatcher/rail corrugation/dynamic stress/virtual excitation/fatigue life分类
交通工程引用本文复制引用
刘阳,温泽峰,吴兴文,周亚波,陶功权,张振先,侯建文,易志..基于虚拟激励法的地铁车辆排障器疲劳失效研究及拓扑优化[J].中国机械工程,2025,36(4):840-849,10.基金项目
四川省科技计划(2023YFH0049) （2023YFH0049）
中国科协青年人才托举工程项目(2019QNRC001) （2019QNRC001）
四川省自然科学基金(2023NSFSC0374) （2023NSFSC0374）
