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Dynamic analysis and optimization of lifting lug fixed to axle box of metro vehicle

LI Zhuo,ZHOU Jinsong,ZHANG Xueming,HU Wenli,YANG Shaobin(Institute of Railway & Urban Mass Transit Research,Tongji University,Shanghai 201804,China)  
As to the problem that the lifting lugs fixed to the axle boxes of a certain type of metro vehicle are fractured several times during vehicle operation,which are designed for protecting the primary suspension,the lug modal frequency response is analyzed by inputting experimental data into a finite element model established by HyperWorks.By comparison of the simulation results with the test results,the model is adjusted to ensure the simulation correctness.According to the comprehensive analysis on the results of simulation and test,the reasons that the lug modal frequency response is too large are found and the topology optimization is performed on lug structure by OptiStruct.According to the optimization results,four new schemes are proposed and the static strength,modal frequency,modal frequency response,volume and so on are compared to determine a best scheme.
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