基于实测谱的转向架支架随机振动仿真分析及结构改进
谢莹莹王洪雨金鑫
Bogie Bracket Random Vibration Simulation Analysis and Structural Improvement Based on Field-measured Spectrum
XIE YingyingWANG HongyuJIN Xin
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作者信息:中车南京浦镇车辆有限公司， 210031， 南京
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Affiliation:CRRC Nanjing Puzhen CO., Ltd., 210031, Nanjing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.05.007
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中图分类号/CLCN:U260-331
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栏目/Col:研究报告
摘要:
［目的］对某一安装在城市轨道交通车辆转向架构架端部的天线支架结构，在随机振动激励下的疲劳损伤情况进行研究，以期提出改进措施。［方法］利用有限元分析软件对天线支架系统进行有限元建模，对结构进行模态分析，在此基础上用线路实测的ASD(振动加速度谱密度)代替标准谱作为载荷激励；在疲劳分析软件nCode中对天线支架进行随机振动仿真，获取支架的疲劳损伤结果；针对支架疲劳薄弱部位提出改进措施，并验证改进措施的有效性。［结果及结论］通过仿真发现：此结构的疲劳薄弱部位在支架两侧筋板的根部，最大总损伤为15.58，其不能满足运用要求。改进措施为：将支架两侧筋板根部进行局部加厚，并在侧面增加支撑筋。采取上述措施后，支架的疲劳损伤值显著降低，最大总损伤为0.02，其可满足运用要求，从而验证了改进方案的有效性。
Abstracts:
［Objective］ It is aimed to investigate the fatigue damage of an antenna bracket structure installed at urban rail transit vehicle bogie frame end under random vibration excitation, and improvement measures are proposed. ［Method］ Finite element modeling of the antenna bracket system is conducted using finite element analysis software. Modal analysis of the structure is performed, and the on-site measured vibration ASD (acceleration spectral density) from the track is used as the load excitation instead of the standard spectrum. A random vibration simulation of the antenna bracket is conducted using fatigue analysis software nCode to obtain the bracket fatigue damage result. Improvement measures are proposed for the fatigue weak points of the bracket, and the effectiveness of the improvement measures is verified. ［Result & Conclusion］ Simulation results reveal that the fatigue weak points of this structure are at the roots of the reinforcement plates on bracket both sides, with a maximum total damage of 15.58, failing to meet application requirements. The improvement measures involve locally thickened plate roots on bracket both sides and adding support ribs on the sides. After implementing these measures, the fatigue damage value of the bracket significantly decreased, with a maximum total damage of 0.02, meeting application requirements, thereby verifying the effectiveness of the improvement scheme.
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